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Fluke 2680A, Service Manual

The Fluke 2680A is a versatile and powerful testing instrument, widely used across industries. To help you make the most of its features, we offer a comprehensive "Getting Started Manual" for free download. Unlock the full potential of your Fluke 2680A at 88.208.23.73:8080, where you can easily access the manual with just a click.

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Theory of Operation

A/D Theory of Operations

2

2-29

Temperature sensor transistor A4Q1 outputs a voltage inversely proportional to the
temperature of the input channel terminals. This voltage is 0.6 V dc at 25 

°

C, increasing

2 mV with each degree decrease in temperature, or decreasing 2 mV with each degree
increase in temperature. For high accuracy, A4Q1 is physically centered within and
thermally linked to the 20 input terminals. Local voltage reference A4VR1 and resistors
A4R1 through A4R3 set the calibrated operating current of the temperature sensor.
Capacitor A4C1 shunts noise and EMI to ground.

A31 A/D Power Supply Circuit Description

The A/D power supply is a dc to dc converter that provides not only the +/-5.2 (Vdd/Vss)
and +5.6 (Vdd~) supplies to the A/D PCAs but also isolates the boards from one another.

Controller/System Power (Outguard) to A3 A/D Converter (Inguard)
Communications

The exclusive means of communication between the inguard and outguard is a bi-
directional, asynchronous, optically-isolated serial link. This link operates at a rate of
120,000 baud. The individual bytes are transmitted with eight data bits, one stop bit, and
one even parity bit.

The outguard can send either a reset or a command to the inguard. A reset consists of a
number of consecutive break characters, and causes a complete reset of the inguard
hardware and software. The inguard returns no response to a reset. A command is a
six-byte packet (hereafter referred to as a ’command packet’) that causes the inguard to
perform some action and return one or more six-byte response packets. Transactions
between the outguard and inguard are always initiated by the outguard. The inguard never
sends data across the guard without being asked to do so.

There are two modes of communication between the inguard and outguard: non-pipelined
and pipelined. In the non-pipelined mode, commands and responses are synchronous, i.e.,
the outguard waits for the response to a command before sending another command. In
the pipelined mode, the outguard may send a second command before the first command
has completed. The outguard must wait for the response from the first command before
sending a third command.

Special Codes

An ACK response packet is arbitrarily defined as the sequence of bytes (42,0,0,0,0,x)
where x is the checksum byte. A NAK response packet is defined as
(255,255,255,255,255,x) where x is the checksum byte. A break is an all-zeros without
stop bits.

Resets

A reset consists of 5 ms of consecutive break characters sent to the inguard. A hardware
circuit on the inguard detects this condition and causes a complete reset of the inguard
subsystem. The inguard sends no response to a reset. After sending a reset, the outguard
must wait a predefined amount of time before attempting further communication with the
inguard. This is the same amount of time it waits after a power-up, approximately 3.5
seconds.

Summary of Contents for 2680A

Page 1: ...A Data Acquisition System Data Logging System Service Manual PN 1883791 November 2002 2002 Fluke Corporation All rights reserved Printed in USA All product names are trademarks of their respective companies ...

Page 2: ...e warranty period To obtain warranty service contact your nearest Fluke authorized service center to obtain return authorization information then send the product to that service center with a description of the difficulty postage and insurance prepaid FOB Destination Fluke assumes no risk for damage in transit Following warranty repair the product will be returned to Buyer transportation prepaid ...

Page 3: ... branch circuits If necessary the user should consult the dealer or an experienced radio television technician for additional suggestions The user may find the following booklet prepared by the Federal Communications Commission helpful How to Identify and Resolve Radio TV Interference Problems This booklet is available from the U S Government Printing Office Washington D C 20402 Stock No 004 000 0...

Page 4: ...proper fuse To avoid fire hazard for fuse replacement use only a 1 2 ampere 250 V time delay line fuse DC POWER SOURCE The device may also be operated from a 9 V to 45 V dc power source when either the rear panel ground binding post or the power cord grounding conductor is connected properly The input is protected by a 4 ampere fuse internal to the device This fuse should only be replaced by a qua...

Page 5: ... power source connected to the rear panel Do not operate the device without the cover properly installed There is no need for the operator to remove the cover DO NOT ATTEMPT TO OPERATE IF PROTECTION MAY BE IMPAIRED If the device appears damaged or operates abnormally protection may be impaired Do not attempt to operate the device under these conditions Refer all question of proper device operation...

Page 6: ......

Page 7: ...6 PAI A D 4 Wire RTD per ITS 1990 Measurement Specifications 1 16 PAI A D 2 Wire RTD per ITS 1990 Measurement Specifications 1 16 PAI A D Thermocouple per ITS 1990 Measurement Specifications 1 17 PAI A D Frequency Measurement Specifications 1 20 Fast Analog Input FAI A D Specifications 1 21 FAI A D DC Voltage Measurement Specifications 1 21 FAI A D AC Voltage Measurement Specifications 1 22 FAI A ...

Page 8: ... 2 14 Analog Measurement Processor 2 15 Input Protection 2 15 Input Signal Conditioning 2 15 Analog to Digital a d Converter 2 15 Inguard Microcontroller 2 15 Channel Selection 2 15 Open Thermocouple Check 2 16 Analog Input PCA Block Description 2 16 20 Channel Terminals 2 16 Reference Junction Temperature 2 16 A D Converter PCA Circuit Description 2 16 Stallion Chip 2 18 Input Protection 2 18 Inp...

Page 9: ... 2 34 Channel MUX 2 34 Function Relays 2 35 Stallion Chip and Signal Conditioning 2 36 A D 2 39 DISCHARGE Signal 2 42 Open Thermocouple Detector 2 42 Channel Measurements 2 42 Reading Rates 2 42 Measurement Types 2 43 Autoranging 2 45 Overload 2 45 Housekeeping Readings 2 45 Reading Types 2 45 Housekeeping Schedule 2 46 Self Tests 2 47 Power Up Self Tests 2 47 Self Test Command 2 47 3 Maintenance ...

Page 10: ...t 4 21 Totalizer Tests 4 22 RS 232 Totalizer Count Test 4 22 RS 232 Totalizer Count and Enable Test 4 22 RS 232 Totalizer Count and Direction Test 4 22 RS 232 Totalizer Count and Debounce Test 4 23 Fluke DAQ Totalizer Count Test 4 23 Fluke DAQ Totalizer Count and Enable Test 4 23 Fluke DAQ Totalizer Count and Direction Test 4 24 Fluke DAQ Totalizer Count and Debounce Test 4 24 5 Calibration 5 1 In...

Page 11: ...ubleshooting the Power Supply 6 37 A2 Display PCA Troubleshooting 6 37 Variations in the Display 6 39 PCMCIA PCA Troubleshooting 6 40 A D Power Supply PCA Troubleshooting 6 40 DIO Module Troubleshooting 6 40 Digital Input Buffers 6 41 Digital Output Drivers 6 41 Relay Output Drivers 6 41 Totalizer Input 6 42 Totalizer Enable 6 42 Digital Output PCA Troubleshooting 6 42 A3 A D Converter Module Trou...

Page 12: ...268XA Service Manual vi ...

Page 13: ...fficient 1 16 1 17 PAI A D 4 Wire RTD Specifications 1 16 1 18 PAI A D Thermocouple General Specifications 1 17 1 19 PAI A D Thermocouple Specifications 1 18 1 20 PAI A D Frequency Accuracy Specifications 1 20 1 21 PAI A D Frequency Sensitivity Specifications 1 20 1 22 FAI A D DC Voltage General Specifications 1 21 1 23 FAI A D DC Voltage Resolution and Repeatability Specifications 1 21 1 24 FAI A...

Page 14: ...asurement 2 42 2 17 Frequency Sensitivity 2 44 2 18 A D Reading to Average to Obtain a Reference Balance Measurement 2 46 3 1 Self Test Codes 3 4 4 1 Recommended Test Equipment 4 4 5 1 RS 232 Device Configuration for Calibration Procedures 5 6 5 2 Calibration Commands 5 9 5 3 Manual Calibration Command Responses 5 10 5 4 Manual V dc Calibration 5 11 5 5 Manual V ac Calibration 5 13 5 6 Manual Resi...

Page 15: ...ormal Reading 2 39 2 13 A D Timing PAI Normal Reading PAI and FAI Reference Balance 2 39 2 14 A D Status Signals 2 40 3 1 Replacing the Fuse 3 7 3 2 DC Fuse Location 3 9 4 1 Connection Between Device and Host 4 5 4 2 2 Wire Connections to 5700A 4 15 4 3 4 Wire Connections to the Universal Input Module Resistor 4 16 4 4 4 Wire Connections to the Universal Input Module 5700A 4 17 4 5 DIO Connector M...

Page 16: ...em Power PCA 8 5 8 3 Digital I O PCA 8 11 8 4 Backplane Extender PCA 8 15 8 5 Extender PCA 8 17 8 6 A D Supply Assembly 8 19 8 7 PCMCIA PCA 8 21 8 8 Output PCA 8 23 8 9 A D PFE PCA 8 25 8 10 A D FFE PCA 8 32 8 11 Analog Input Connector PCA 8 39 8 12 Display PCA 8 41 ...

Page 17: ...4 Wire RTD per ITS 1990 Measurement Specifications 1 16 PAI A D 2 Wire RTD per ITS 1990 Measurement Specifications 1 16 PAI A D Thermocouple per ITS 1990 Measurement Specifications 1 17 PAI A D Frequency Measurement Specifications 1 20 Fast Analog Input FAI A D Specifications 1 21 FAI A D DC Voltage Measurement Specifications 1 21 FAI A D AC Voltage Measurement Specifications 1 22 FAI A D 4 Wire R...

Page 18: ...268XA Service Manual 1 2 ...

Page 19: ... thermistors or resistance temperature detectors RTDs The devices also have extensive computed math capability Besides using data collected from the analog modules and digital totalizer time can also be used in computed channel calculations The system scans 20 to 120 analog channels and calculates the values for up to 60 computed channels Interval timers alarm conditions and or an external signal ...

Page 20: ...A Service Manual 1 4 REVIEW LAST MAX MIN REM AUTO SCAN MON SET Mx B FUNC ALARM C F RO mV AC DC x1Mk Hz LIMIT HI LO OFF CAL PRN EXT CH TR 1 2 F 2680 SERIES DAQ SYSTEM alg46f eps Figure 1 1 2680A 2686A Device ...

Page 21: ...d Power Power Daughter Card Opto isolators M o t h e r b o a r d C o n t r o l l e r A D 2 TCP IP Network Display Keypad A C and Battery Supply Circuits Line Voltage or Battery Voltage Controller RAM FLASH Real Time clock ATA Card Ethernet RS232 RS232 cal test A D 3 A D 4 A D 5 DIO or A D 6 External Trig out External Trig in Filter and A D circuits Microprocessor PCMCIA Type II Memory Slot alg50f ...

Page 22: ...r d C o n t r o l l e r A D 1 Tcp IP Network Display Keypad RS232 cal test A D 2 A D 3 A D 4 A D 5 External Trig in Isolated Power Power Daughter Card Opto isolators A C and Battery Supply Circuits Controller RAM FLASH Real Time clock Ethernet RS232 ATA Card PCMCIA Type II Memory Slot Line Voltage or Battery Voltage Removable Connector Card alg51f eps Figure 1 2 268XA Chassis cont ...

Page 23: ...ly only to the Precision A D Input PAI module The third section contains specifications that apply only to the Fast A D Input FAI module The last section contains information only for the digital I O relay and the totalizer DIO module 2680A 2686A Combined Specifications The following specifications apply to both the 2680A and 2686A devices The topics include General Specifications PAI FAI Environm...

Page 24: ...26 Safety EN61010 1 CAT II DIO is rated CAT I CSA C22 2 No 1010 1 Serial Interface Connector 9 pin male DB9 Signals Tx Rx DTR RTS GND Modem Control full duplex Baud rates 4800 9600 19200 38400 19 200 default Data format 8 data bits no parity one stop bit Flow Control XON XOFF Echo off Common Mode Voltage Precision Analog Input 150 300 on channels 1 and 11 Fast Analog Input 50 V dc or 30 V ac rms O...

Page 25: ...er not set Minimum 2 0 V Maximum 7 0 V Logical Low Trigger set Minimum 0 6 V Maximum 0 8 V Compatibility TTL or Contact Closure Isolation None dc coupled Minimum Pulse Width 5 µs Maximum Frequency Nominal 400 Hz Repeatability 3 ms Trigger Out Specifications The next table provides a summary of the Trigger Out specifications The Trigger Out output is located on the rear panel connector terminals Tr...

Page 26: ...r through an RS 232 port The 10 100BaseT provides the primary communication interface The RS 232 is used for calibration and limited debug capability 2686A PC Card Storage The 2686A supports a non volatile PC Card PCMCIA ATA type card memory module option This table provides a list of active channels and the number of scans to memory card capacity The standard Controller card will store approximat...

Page 27: ...c 50 Hz 60 Hz 0 1 1 kΩ imbalance Medium and Fast Rates Channel to Channel Cross talk 120 dB minimum Slow Rate e g 30 V dc on channel 1 may cause a 30 µV error on channel 2 100 dB minimum Medium and Fast Rates e g 1V dc on channel 1 may cause a 10 µV error on channel 2 Temperature Coefficient For input Add 1 10th the 90 day specification per C above 28 C or below 18 C For floor error V Add 1 20th t...

Page 28: ... 18 C to 28 C 10 C to 60 C Range 90 Day 1 Year 1 Year Slow Fast Slow Fast Slow Fast 90 mV 01 7 µV 01 17 µV 013 8 µV 013 18 µV 042 18 2 µV 042 44 2 µV 300 mV 01 15 µV 01 30 µV 013 17 µV 013 35 µV 042 39 µV 042 78 µV 750 mV 01 40 µV 01 70 µV 013 50 µV 013 80 µV 042 104 µV 042 182 µV 3 V 01 0 1 mV 01 0 2 mV 013 0 15 mV 013 0 2 mV 042 0 26 mV 042 0 52 mV 30 V 01 1 5 mV 02 3 mV 013 1 7 mV 026 3 5 mV 04...

Page 29: ...erminal 150 V ac rms from any terminal on channels 2 through 10 and 12 through 20 to any other input terminal Maximum Volt Hertz Product 2x106 Volt Hertz product on any range normal mode input 1x106 Volt Hertz product on any range common mode input Temperature Coefficient Linear interpolation between 2 applicable points for temperatures between 28 C and 60 C or 10 C and 18 C e g if the applicable ...

Page 30: ... 2 5 mV 10 kHz to 20 kHz 0 4 2 5 mV 1 5 mV 0 5 2 5 mV 1 2 5 mV 20 kHz to 50 kHz 1 3 mV 1 5 6 mV 1 5 3 mV 2 6 mV 50 kHz to 100 kHz 2 5 mV 3 10 mV 3 5 mV 4 10 mV 30 V 20 to 50 Hz 3 25 mV 6 50 mV 3 5 25 mV 7 50 mV 50 to 150 Hz 0 4 25 mV 1 50 mV 0 5 25 mV 1 2 40 mV 150 Hz to 10 kHz 0 3 25 mV 1 50 mV 0 5 25 mV 1 2 40 mV 10 kHz to 20 kHz 0 4 25 mV 1 50 mV 0 5 25 mV 1 2 40 mV 20 kHz to 50 kHz 1 30 mV 1 5...

Page 31: ...V 3 5 V 3 kΩ 10 mΩ 30 mΩ 100 µA 300 mV 3 5 V 30 kΩ 100 mΩ 300 mΩ 10 µA 300 mV 3 5 V 300 kΩ 1 Ω 3 Ω 10 µA 3 0 V 3 5 V 3 MΩ 10 Ω 30 Ω 1 µA 3 0 V 3 5 V Table 1 15 PAI A D 4 Wire Resistance Accuracy Specifications Accuracy 3σ input V 18 C to 28 C 10 C to 60 C Range 90 Day 1 Year 1 Year Slow Fast Slow Fast Slow Fast 300 Ω 015 20 mΩ 02 80 mΩ 02 50 mΩ 02 120 mΩ 084 126 mΩ 084 336 mΩ 3 kΩ 02 3 Ω 02 8 Ω 02...

Page 32: ...on at 40 C is 75 2 x 40 28 60 28 2 0 406 Accuracy at 20 C Multiply the 10 C to 60 C accuracy specification by 2 After 1 hour warm up For accuracy between 10 C and 20 C interpolate linearly Table 1 17 PAI A D 4 Wire RTD Specifications Accuracy 3σ Temperature Resolution 90 Day 18 C to 28 C 1 Year 18 C to 28 C 1 Year 10 C to 60 C Slow Fast Slow Fast Slow Slow Fast 200 C 0 003 C 0 007 C 0 06 C 0 16 C ...

Page 33: ...njecting a small ac signal into the input after each measurement A thermocouple resistance greater than 1k to 10k is detected as an open input Temperature Coefficient To calculate Thermocouple accuracy for temperatures between 28 C and 60 C or 10 C and 18 C use a linear interpolation between the two applicable points For example if the applicable specification at 28 C is 0 6 and the specification ...

Page 34: ...0 1 20 1 80 1000 to 1800 05 1 00 1 30 2 10 2 10 2 80 1800 to 2316 05 1 60 2 10 3 20 3 40 4 60 E 100 to 25 03 0 45 0 50 0 80 0 60 0 80 25 to 20 02 0 35 0 40 0 60 0 50 0 70 20 to 600 02 0 30 0 40 0 60 0 50 0 80 600 to 1000 02 0 40 0 50 0 70 0 90 1 00 J 100 to 80 03 0 45 0 50 0 80 0 60 0 80 80 to 230 02 0 35 0 50 0 70 0 60 0 80 230 to 760 02 0 40 0 50 0 70 0 80 0 90 K 100 to 25 04 0 55 0 60 0 90 0 70...

Page 35: ...2 30 1 30 2 40 1000 to 1400 0 1 0 80 1 00 1 90 1 40 2 30 1400 to 1767 0 1 1 00 1 30 2 20 1 80 2 80 T 100 to 0 04 0 60 0 65 1 00 0 70 1 10 0 to 150 03 0 40 0 50 0 80 0 60 0 90 150 to 400 02 0 30 0 40 0 60 0 60 0 80 U 100 to 0 04 1 50 1 50 2 60 1 60 3 00 0 to 600 04 0 60 0 80 1 60 1 10 1 90 Thermistor Accuracy C 90 Day 1 Year Temp C Range Slow Slow 40 to 150 100 to 100 mΩ 0 3 0 4 18 to 23 C Steinhar...

Page 36: ...1 Hz 0 05 10 Hz 90 kHz to 900 kHz 10 Hz 100 Hz 0 05 10 Hz 0 05 100 Hz 1 MHz 100 Hz 1 kHz 0 05 100 Hz 0 05 1 kHz Table 1 21 PAI A D Frequency Sensitivity Specifications Frequency Measurement Sensitivity Sinewave Frequency Range Minimum Signal Maximum Signal 15 Hz to 70 kHz 100 mV ac rms V 150 300 V rms 1 and Vx Hz 2x106 70 kHz to 100 kHz 100 mV ac rms 20 V ac rms 100 kHz to 200 kHz 150 mV ac rms 10...

Page 37: ... 0 1 1 kΩ imbalance Medium and Fast Rates Channel to Channel Crosstalk 120 dB minimum Slow Rate e g 30 V dc on channel 1 may cause a 30 µV error on channel 2 80 dB minimum Medium and Fast Rates e g 1 V dc on channel 1 may cause a 10 µV error on channel 2 Temperature Coefficient For input Add 1 10th the 90 day specification per C above 28 C or below 18 C For floor error V Add 1 20th the 90 day spec...

Page 38: ...inusoidal input signals with crest factors between 2 and 3 and pulse widths 100 µs add 0 2 to the accuracy specifications Common Mode Rejection 80 dB minimum at dc 50 Hz 60 Hz 0 1 1 kΩ imbalance Slow Rate Maximum Input Voltage The lesser voltage of 30 V ac rms from any input terminal to earth 30 V ac rms from any terminal input to any other input terminal Maximum Volt Hertz Product 2x106 Volt Hert...

Page 39: ...V 1 5 mV 0 7 25 mV 1 5 5 mV 20 kHz to 50 kHz 2 3 mV 3 5 mV 3 3 mV 4 5 mV 50 kHz to 100 kHz 5 5 mV 5 1 mV 7 5 mV 8 1 mV 3 V 20 to 50 Hz 3 2 5 mV 6 5 mV 3 5 2 5 mV 7 5 mV 50 to 150 Hz 0 4 2 5 mV 0 8 5 mV 0 5 2 5 mV 1 5 mV 150 Hz to 10 kHz 0 3 2 5 mV 0 6 5 mV 0 4 2 5 mV 1 5 mV 10 kHz to 20 kHz 0 4 2 5 mV 0 8 5 mV 0 5 2 5 mV 1 5 mV 20 kHz to 50 kHz 1 3 mV 1 5 6 mV 1 5 3 mV 2 6 mV 50 kHz to 100 kHz 2 5...

Page 40: ...le 1 29 FAI A D 4 Wire Resistance Range and Resolution Specifications Resolution Current Full Scale Maximum Voltage Range Slow Fast Applied Voltage Applied by Instrument 300 Ω 10 mΩ 30 mΩ 1 mA 300 mV 3 5 V 3 kΩ 100 mΩ 300 mΩ 100 µA 300 mV 3 5 V 30 kΩ 1 Ω 3 Ω 10 µA 300 mV 3 5 V 300 kΩ 10 Ω 30 Ω 10 µA 3 0 V 3 5 V 3 MΩ 100 Ω 300 Ω 1 µA 3 0 V 3 5 V Table 1 30 FAI A D 4 Wire Resistance Accuracy Specifi...

Page 41: ...fficient Specification Characteristic Temperature Coefficient To calculate RTD accuracy for temperatures between 28 C and 60 C or 10 C and 18 C use a linear interpolation between the two applicable points For example if the applicable specification at 28 C is 0 2 and the specifications at 60 C is 0 75 then the specification at 40 C 75 2 x 40 28 60 28 2 406 Accuracy at 20 C Multiply the 10 C to 60 ...

Page 42: ...pecification at 28 C is 0 6 and the specification at 60 C is 1 1 then the specification at 40 C is 1 1 0 6 x 40 28 60 28 0 6 0 7875 Accuracy at 20 C Multiply the 10 C to 60 C accuracy specification by 2 After 1 hour warm up For accuracy between 10 C and 20 C interpolate linearly Table 1 34 FAI A D Thermocouple Specifications Accuracy C Thermocouple Resolution 18 C to 28 C 10 C to 60 C ITS90 C 90 D...

Page 43: ...1 50 2 30 2 00 2 90 L 100 to 100 4 1 20 1 30 2 90 1 60 3 10 100 to 800 4 0 90 1 00 2 10 1 20 2 30 800 to 900 3 0 70 0 80 1 30 1 00 1 50 N 100 to 25 5 1 40 1 50 2 80 1 50 2 90 25 to 120 5 1 10 1 30 2 30 1 30 2 40 120 to 1000 4 1 00 1 10 2 00 1 20 2 10 1000 to 1300 3 1 00 1 20 1 90 1 60 2 40 R 250 to 600 1 2 40 2 70 5 60 2 80 5 70 600 to 1500 1 2 00 2 30 4 60 2 40 4 80 1500 to 1767 1 2 00 2 30 4 50 ...

Page 44: ... 35 FAI A D Frequency Accuracy Specifications Frequency Measurement Accuracy 1 Year 10 C to 60 C Range Resolution Accuracy input Hz Slow Fast Slow Fast 15 Hz to 900 Hz 0 01 Hz 0 1 Hz 0 05 0 02 Hz 0 05 0 2 Hz 900 Hz to 9 kHz 0 1 Hz 1 Hz 0 05 0 1 Hz 0 05 1 Hz 9 kHz to 90 kHz 1 Hz 10 Hz 0 05 1 Hz 0 05 10 Hz 90 kHz to 900 kHz 10 Hz 100 Hz 0 05 10 Hz 0 05 100 Hz 1 MHz 100 Hz 1 kHz 0 05 100 Hz 0 05 1 kH...

Page 45: ...igital connector terminals 0 to 19 and GND Note that the Master Alarm can be designated as any Digital output channel or one of the four relays outputs discussed later Table 1 37 Digital I O Specification Specification Characteristic Maximum Input Voltage 30 V Minimum Input Voltage 4 V Isolation None dc coupled Threshold 1 4 V Hysteresis 500 mV Input Debouncing None or 1 75 ms selectable Output Vo...

Page 46: ...shold 1 4 V Hysteresis 500 mV Input Debouncing None or 1 75 ms selectable Maximum Transition Rate 5 kHz Debounce disabled 500 Hz Debounce enabled Maximum Count for Totalizer 4 294 967 295 Digital Relay Specifications The next table provides a summary of the relay specifications for the 8 relay contact pairs on the output card Relay contacts are located on the Output Module connector terminals X to...

Page 47: ...tal Connector Module 2680A 180 Input Module w o Terminal Strips 2680A 800 16 MB Memory Card 2680A 801 128 MB Memory Card 2680A 802 256 MB Memory Card 2680A 805 512 MB Memory Card 2680A 810 1 GB Memory Card 2680A BLANK Blank Module 2680A APSW Fluke DAQ Software Included with the purchase of each chassis 2680A DEVSW Fluke Development Software from InduSoft 2680A DLL Fluke DLL Library routines for th...

Page 48: ...268XA Service Manual 1 32 ...

Page 49: ...1 Microcontroller 2 12 Data Input Threshold 2 12 Digital Input Buffers 2 13 Digital Output Drivers 2 13 Relay Output Drivers 2 13 Totalizer Input 2 14 Totalizer Enable 2 14 A D Theory of Operations 2 14 A D Converter PCA Block Description 2 14 Analog Measurement Processor 2 15 Input Protection 2 15 Input Signal Conditioning 2 15 Analog to Digital a d Converter 2 15 Inguard Microcontroller 2 15 Cha...

Page 50: ...n 2 29 Controller System Power Outguard to A3 A D Converter Inguard Communications 2 29 Special Codes 2 29 Resets 2 29 Commands 2 30 Perform Scan 2 30 Perform Self Test 2 31 Return Firmware Version 2 31 Return Boot Firmware Version 2 31 Set Global Configuration 2 32 Set Channel Configuration 2 32 Do Housekeeping 2 32 Checksums 2 33 Errors 2 33 Power Up Protocol 2 33 Inguard Unresponsive 2 33 Ingua...

Page 51: ...n control system Note that the blocks labeled Module n can be any valid module type either FAI PAI or DIO The hardware system functionality is independent of the module type RS232 PCMCIA v2 1 Control UART MII SPI Control Data Addr Display Cal EEPROMs Micro Processor Transreceivers PCMCIA Slot 2686A only FLASH ROM SDRAM Keypad FPGA Isolation Module 1 Module 2 Module 3 Module 4 Module 5 Module 6 10 ...

Page 52: ...4 board Table 2 1 provides a summary of all the connectors on the 4004 PCA Table 2 1 Controller Connector Description Connector Reference Designator Description P1 DB9 RS232 for calibration only P2 10 100 Base T Ethernet RJ45 P3 100 pin through hole connector to the backplane PCA 4001 P4 100 pin surface mount connector to the PCMCIA PCA 4041 P5 3 pin Mate N Lok RS232 for console port connection P6...

Page 53: ...of the chassis The primary power is always connected to the mains power Secondary Supplies The power source for the vacuum florescent display primarily consists of a 50KHz differential clock FIL_CLK and FIL_CLK 2 N channel FETs Q301 2 a transformer T2 and an linear LDO low drop out regulator U307 The biphase clock source is driven from the FPGA U25 upon its release from configuration Q301 2 and T2...

Page 54: ...he CPM handles the RS232 and serial peripheral interface SPI protocols the baud rate generators hardware and software timers and the interrupt controller The SIU handles the memory control signals the internal and external bus interface the PCMCIA control and the real time clock See Figure 2 3 below The SIU also contains a software watchdog timer As of the date of this writing it has not been enab...

Page 55: ...512 bytes total Each receive buffer can hold 1 complete scan s worth of data with all channels configured before it needs to be read The status and control registers serve to mask off or enable certain conditions for interrupt to the microprocessor The interface to the microprocessor is a 16 bit bi directional data bus a 5 bit address a chip select read and write enables a single interrupt line GR...

Page 56: ...Other Bus Devices The microprocessor s external bus controller in addition to the fpga communicates with onboard SDRAM onboard flash ROM and PCMCIA flash memory cards These additional device interfaces are contained on page 4 of the 1004 schematic There are 32 MB of onboard SDRAM configured as 4 8 MB by 8 bit wide devices U18 19 21 and 22 The timing of the row and column address strobes RAS CAS ch...

Page 57: ... of them is user accessible from the rear panel at connector P1 and the other P5 is for development and debug only P1 is an industry standard Male DB9 connector The modem control signals RTS DTR CTS and DSR are available for use from P1 P5 is a 3 pin mate n lok type connector and requires a special cable assembly in order to use The MAC address serial number IP address and other sensitive boot con...

Page 58: ...isplay controller PCA physically plug into It contains minimal circuitry only that which is needed for signal integrity and ESD protection It is basically a pass through board for the guard crossing signals from the fpga to the modules and the SPI bus that goes to the display and the calibration EEPROMs from the MPC855T on the 4004 controller PCA Refer to the 1001 schematic for reference designato...

Page 59: ...nto a 2 row 10 pin header on the module The power supply design uses a fully isolated push pull topology driven from a differential 393 kHz clock source There are 3 regulated outputs that power the in guard system 5 2 V Vdd 5 2 V Vss and 5 6 V Vddr each one is derived from a dedicated linear low dropout regulator U5 U6 and U4 respectively The isolation transformer which is rated at 300 V Category ...

Page 60: ... RS 232 terminal to P3 or P4 and moving R35 a zero ohm resistor to position R36 this redirects the receive signal from the mainframe to the microcontroller to the RS 232 port U2 Maxim MAX232 accomplishes the bi directional RS 232 communication It uses a single supply 5 Vcc and internally level shifts the signals to standard RS 232 levels Communication is controlled by the built in UART in the micr...

Page 61: ...y setting the level of the output U4 Pin 59 When U4 Pin 59 is set high the output of the open collector Darlington driver U13 Pin 13 sinks current through current limiting resistor R80 When U4 Pin 59 is set low the driver output turns off and is pulled up by Z4 and or the voltage of the external device that the output is driving If the driver output is driving an external inductive load the intern...

Page 62: ...troller provides an 8kHz clock signal to the PLD which is divided down to 2 kHz internally The 2 kHz signal is used to clock the shift register which produces a pulse every 2 ms 500 Hz This pulse is then compared against the Totalizer signal itself If the pulse duration of the Totalizer is greater then 1 75 ms the Totalizer signal is passed to the output of the PLD U3 Pin 23 If the duration of the...

Page 63: ...mount of time During this time positive and negative reference voltages are alternately applied to the integrator The references are switched in a sequence controlled by the A D Electrically Programmed Logic Device EPLD A3U18 which prevents the integrator from saturating The amount of time that each reference is applied to the integrator and the amount of time required to discharge the capacitor a...

Page 64: ...ed very close to the same temperature for accurate thermocouple measurements Reference Junction Temperature A semiconductor junction is used to sense the temperature of the thermocouple input terminals The resulting dc output voltage is proportional to the block temperature and is sent to the A D Converter PCA for measurement A D Converter PCA Circuit Description The following paragraphs describe ...

Page 65: ...rrent Source Input Protection Signal Conditioning Selectable Gains x1 x10 x4 021 x32 168 BR4 BR3 BR2 BR1 A D Converter 3 45V dc References FPGA Microprocessor Guard Crossing Serial Bus Flash RAM Serial Digital Output Relay Drivers Latches Vdd 5 2V dc Vss 5 2V dc Vddr 5 6V dc Reg Vcc 5 0V dc A D DC Buffer Amplifier alg110f eps Figure 2 5 A3 A D Converter Block Diagram ...

Page 66: ...caled to a dc voltage 3 volts or less for input to the buffer amplifier A3U27 A3U28 and related devices which scales the voltage to approximately 3 V Full Scale for measurement by the multi slope A D converter circuitry The gains of the buffer amplifier are x1 x4 021 x10 and x32 168 Accuracy is derived by software calibration constants AC volts signal conditioning consists of conversion of an ac l...

Page 67: ...2 of A3U30 For the 30 and 300 volt range the input to Stallion A3U30 are as follows for the HI and LO signal inputs The HI signal is scaled by A3Z7 The input is applied to pin 1 of A3Z7 and a 101 1 divider is formed by the 10 MΩ 100 kΩ resistors when switches S3 and S13 are closed The attenuated HI input is then sent via S24 S64 and S44 to the Buffer Amplifier and then to A D Converter The LO sign...

Page 68: ...ible A3Z7 10M S1 S3 S13 S24 S64 S44 A3U27 A3U28 A3U27 AD HI AD LO S37 S33 A3R119 1K A3K27 Reset A3Z7 100K A3K1 A3K23 LO A3L52 R146 A3K27 Reset f2 08 eps Figure 2 6 DC Volts 300 V Range Simplified Schematic Ohms and RTD Measurement Circuitry Resistance measurements are made by sourcing dc current through the unknown resistor and measuring the resultant dc voltage see Table 2 5 The current source co...

Page 69: ...3 V BR3 30 kΩ 10 µA 300 mV 300 mV 10 3 V BR3 300 kΩ 10 µA 3 V 3 V 1 3 V BR3 3 MΩ 1 µA 3 V 3 V 1 3 V BR3 CHANNEL 1 CHANNEL II A3K1 A3K21 HI Sense A3R111 1K Fusible A3K26 A3R130 HI S23 S64 S44 to A D Buffer A3K11 A3K27 HI A3R110 1K Fusible A3K24 A3R138 1K VDD A3Z7 1K A3Q19 A3U31 3 45V Ref _ 7 A3R128 3 45K A3U31 _ 1 S19 S14 S15 S13 S12 A3K27 VDD A3Z7 10K A3Z7 1K A3Z7 100K A3Z7 1M S9 S10 S8 S7 IOUT HI...

Page 70: ... Scale Output of RMS Converter Full Scale Input to Stallion dc volts Full Scale Output of Stallion dc volts Gain of DC Buffer Amplifier Full Scale DC Volts Input to Multislope A D Buffer Range Control Signal 300 mV 2 5 0 75 V rms 0 75 V 300 mV 300 mV 10 3 V BR3 3 V 0 25 0 75 V rms 0 75 V 300 mV 300 mV 10 3 V BR3 30 V 0 025 0 75 V rms 0 75 V 300 mV 300 mV 10 3 V BR3 150 300 V 0 0025 0 75 V rms 0 75...

Page 71: ...D LOW VIN RMSOUT A3Z2 4 95K A3R103 100K A3C57 A3Z2 3 3K A3C58 A3R102 100K A3R104 100K A3C59 _ To Pin 31 of A3U30 S41 S44 TO BUFFER AMP A3U26 f2 10 eps Figure 2 8 AC Volts V Range Simplified Schematic Frequency Measurements The ac input follows the same path as ac volt measurements except the output of the buffer A3U29 is sent to the Stallion Chip pin 35 C Internal to the Stallion Chip switch S38 s...

Page 72: ...A3R64 and A3R65 provide the required current When A3Q5 is tested it has a collector current specified for zero TC This current is converted into resistor values but requires a known voltage differential to operate properly Analog Digital Converter Circuit The A D converter consists of a gate array for control switches for directing currents and a reference circuit and reference resistors for provi...

Page 73: ...termined by the comparator CMP test at the very first of the interval is turned on for the remaining 30 counts 48 µs of the interval The beginning first interval is only 16 counts instead of 32 counts The last state is 35 counts to allow for completing the PREF and NREF pulse count equalization There are 8 normal intervals of 32 counts The purpose is to bound the waveform to prevent amplifier satu...

Page 74: ...lways approach zero from the same direction A hold state with both references off begins until a total of 64 counts have occurred since deintegrate began If the magnitude of the signal as it ends integrate is large this final hold is short If the signal at the end of integrate is small the hold is as long as 60 counts 0V dc f2 11 eps Figure 2 9 Integrator Output Waveform for Input Near 0 0V dc f2 ...

Page 75: ...ch for the PREF and NREF times In the microprocessor the voltage is computed based on the difference between P counts and N counts Overhead Overhead is a fixed amount of time required for signal settling and processing Inguard Digital Kernel Circuitry The inguard digital kernel circuitry consists of devices A3U2 A3U5 A3U6 A3U7 and A3U10 The memory consists of Flash ROM A3U6 that contains the inter...

Page 76: ...eshold level of about 2 7 V Vth the resistance at the input is too large greater than 4 kΩ to 10 kΩ and open T C check is asserted by A3U32 pin 7 After a short delay the A D Microcontroller reads the signal and determines if the thermocouple should be reported to the Controller System Power PCA as open A4 Analog Input PCA Circuit Description The Input Connector assembly which plugs into the A D Co...

Page 77: ...are and software The inguard returns no response to a reset A command is a six byte packet hereafter referred to as a command packet that causes the inguard to perform some action and return one or more six byte response packets Transactions between the outguard and inguard are always initiated by the outguard The inguard never sends data across the guard without being asked to do so There are two...

Page 78: ...eturn BR2 Zero Offset if set Return BR3 Zero Offset if set Return BR4 Zero Offset if set Return Reference Junction Reading if set Return Reference Balance both references off reading if set Return Reference Balance both references on reading if set Return Checksum Action Performed The Perform Scan command causes the inguard to measure each channel indicated These channels must have been previously...

Page 79: ...he correct volts or ohms For most ranges a full range value is returned as 3 0 For example on the 300 Ω range 3 0 represents 300 Ω For the 90 mV and 750 mV ranges however 3 0 represents 93 26 mV and 0 746083 V respectively Also frequency readings always return the actual frequency measured and do not require range scaling by the outguard Perform Self Test The Command Packet tells the A D to perfor...

Page 80: ...gle response packet Response Packet Format Returns either an ACK packet or a NAK if the command arguments are not recognized Set Channel Configuration The Command Packet tells the A D the following Measurement Function V dc V ac 2 Wire Ohms 4 Wire Ohms Frequency Thermocouple OFF Range 90 mV or 300 Ω 300 mV or 3 kΩ 3 V or 30 kΩ 30 V or 300 kΩ 50 V FAI 150 300 V PAI or 3 MΩ 750 mV reference junction...

Page 81: ...insures that all measurement hardware is properly reset This type of error could be caused by a glitch in the inguard hardware which is conceivable but rare The inguard returns a NAK whenever it receives an illegal command or a command with illegal parameters Such an error should never occur and probably indicates a software defect The exception to this is that an error in a scan command returns a...

Page 82: ...Hardware Elements This section contains information about the various hardware subsystems on the inguard board Channel MUX The channel multiplexing consists of treeing and channel switches implemented with either FET switches FAI or reed relays PAI There are two sets of bits associated with these switches The tree bits must be set to indicate which bank of channels is being used where bank 0 is ch...

Page 83: ...25 K26 and K27 that route the signal to different portions of signal conditioning circuitry on the A D board These are relatively slow relays requiring 6 ms to change position Each relay has a SET and RESET position which are configured by pulsing the SET and RESET coils respectively Each change of state of the function relays requires two writes by the A3U5 A D microprocessor one to set the appro...

Page 84: ...y counter The chip contains registers that the A3U5 A D microprocessor may read and write to configure the chip and obtain frequency readings Its interface to the A3U5 A D microprocessor consists of a synchronous serial port The SCP port of the A3U5 A D microprocessor is used to program the Stallion with a clock rate of 3 072 MHz When reading information from the Stallion the only time this needs ...

Page 85: ...41 44 BR3 ACR3 FPWR RPCTL V ac HI V 1 17 18 34 37 39 41 44 BR3 ACR4 FPWR RPCTL 2W 300Ω 10 15 19 23 35 37 39 44 64 BR3 ACR4 FPWR RPCTL 2W 3 kΩ 9 14 19 23 35 37 39 44 64 BR3 ACR4 FPWR RPCTL 2W 30 kΩ 8 13 19 23 35 37 39 44 64 BR3 ACR4 FPWR RPCTL 2W 300 kΩ 8 12 19 23 35 37 39 44 64 BR3 ACR4 FPWR RPCTL 2W 3 MΩ 7 11 19 23 35 37 39 44 64 BR3 ACR4 FPWR RPCTL 4W 300Ω 10 15 19 23 35 37 39 44 64 BR3 ACR4 FPW...

Page 86: ...1 ACR4 FPWR RPCTL After the input channel has been selected and the Stallion chip programmed appropriately there is a minimum time required for the signal conditioning circuitry to settle This settling time varies depending on the function and range being measured and is given in Table 2 14 Table 2 14 Signal Conditioning Settling Time Function Time V dc 30 µs V ac fast 100 ms V ac medium 150 ms V ...

Page 87: ...the A D goes into the Autozero period Immediately following this are the Integrate and Deintegrate periods The only time that the input signal is actually being measured by the A D is during the Integrate period Therefore the channel can be deselected and the Stallion programming for the next channel begun during the Deintegrate period Also the signal conditioning does not need to be settled until...

Page 88: ...shown and then latched with a rising edge on the strobe line Table 2 15 A D Command Codes Command C1 C0 Measure Signal 0 0 Reference Balance Reading Both References 0 1 Reference Balance Reading Neither Reference 1 0 There are two lines from the A D state machine A3U18 that indicate its state These are connected as interrupt request signals to the A3U5 A D microprocessor The falling edge of the A ...

Page 89: ...es and no offsets the basic formula for obtaining volts from N and P counts is as follows V 16P N K where V volts P P counts N N counts K 0 1 2 3 45 16 307 1 6 FAI K 0 1 2 3 45 16 1843 1 6 PAI For higher resolution measurements P and N counts are accumulated for the total number of A D readings in the measurement and then used in the above formula We call these Ptot and Ntot The final voltage is t...

Page 90: ...een charged by the OTC test must be discharged This is done by programming Stallion to apply a short between its HI1 pin and ground setting OTC_CLK low and setting OTC_EN high This short is maintained for 500 us After this OTC_CLK is set high again and OTC_EN is set low Channel Measurements The following paragraphs describe the Channel Measurement characteristics Reading Rates The instrument has t...

Page 91: ...hroughput you cannot perform the sequence of steps given above for each channel Instead certain characteristics of V dc readings are exploited in order to allow the A D to be triggered continuously for all the channels in a V dc block A V dc block consists of a series of channels that are all defined as V dc with similar ranges Similar range means either the low ranges 90 mV 300 mV 750 mV and 3 V ...

Page 92: ...ured amplitude is very low a frequency reading is still attempted since the frequency response of the V ac measurement circuitry rolls off more quickly at higher frequencies than that of the frequency measurement circuitry Table 2 17 Frequency Sensitivity Measured Amplitude Range Used for Frequency Measurement Less than 3 V ACR1 300 mV Between 3 V and 30 V ACR2 3 V Greater than 30 V PAI only ACR3 ...

Page 93: ...is made by the inguard which is comparing uncalibrated raw A D counts These points are selected so that some overlap exists between ranges to ensure a certain amount of hysteresis when changing ranges Also when autoranging on a given scan for a given channel the instrument only up ranges or down ranges not both This avoids infinite autoranging where a channel measurement could hypothetically take ...

Page 94: ...surement mode The number of readings to average is the same as for a normal reading see Table 2 18 A D Readings to Average to Obtain a Measurement Zero offset measurements are converted to volts in the same way as normal channel measurements except of course that no zero offset is subtracted The reference balance scale factor is used Housekeeping Schedule Housekeeping readings are always taken in ...

Page 95: ... set to 10 ms greater than either the PAI or FAI A D reading time Zero Offset Test The zero offset test measures the four zero offsets and ascertains that they are within reasonable limits The test fails if any of the offsets measures greater than 2000 counts FAI or 12000 counts PAI This is approximately 0 175 V A typical zero offset measurement is approximately 0 1 V Reference Balance Test The re...

Page 96: ...268XA Service Manual 2 48 ...

Page 97: ...3 1 Chapter 3 Maintenance Title Page Introduction 3 3 Self Test Diagnostics and Error Codes 3 3 Cleaning 3 6 AC Fuse Replacement 3 7 DC Fuse Replacement 3 8 ...

Page 98: ...268XA Service Manual 3 2 ...

Page 99: ...ower up the current module configuration is evaluated against the stored module configuration used for the last scan If configurations are different one or more error messages will be generated This feature helps identify faulty modules or modules that may have been accidentally removed or replaced with a different module in the system If the configurations do not match the stored configuration ma...

Page 100: ...es incomplete 8 Module 1 A D failure 9 Module 1 zero offset measurements unreasonable 10 Module 1 reference balance measurements unreasonable 11 Module 1 overload detection failed 12 Module 1 open thermocouple detection failed 13 Communication parameter constants corrupt 14 Ethernet address corrupt 15 RAM constants corrupt 16 Ethernet chip failure 17 Module 2 calibration constants corrupt 18 Modul...

Page 101: ... 38 Module 4 open thermocouple detection failed 39 Module 5 calibration constants corrupt 40 Module 5 calibration procedures incomplete 41 Module 5 A D failure 42 Module 5 zero offset measurement unreasonable 43 Module 5 reference balance measurements unreasonable 44 Module 5 overload detection failed 45 Module 5 open thermocouple detection failed 46 Module 6 calibration constants corrupt 47 Modul...

Page 102: ...1 FAI expected in slot 5 600 PAI expected in slot 6 601 FAI expected in slot 6 602 DIO expected in slot 6 Cleaning XWWarning Keep the device dry to avoid electrical shock to personnel or damage to the device To prevent damage never apply solvents to the device housing Wipe the device with a cloth lightly dampened with water or mild detergent Do not use aromatic hydrocarbons chlorinated solvents or...

Page 103: ...ew fuse into the holder You must use a 1 2 ampere 250 V time delay line replacement fuse 4 Reinstall the cables removed in Step 1 Fuse Compartment SLOT CONFIGURATION MODEL XMT LINK RS 232 SERIAL PORT RCV FLUKE CORPORATION MADE IN USA www fluke com PATENTS PENDING CAUTION FOR FIRE PROTECTION REPLACE ONLY WITH A 250V FUSE OF INDICATED RATING STANDBY CHASSIS GROUND 10 100 BASE T ETHERNET NOT FOR CONN...

Page 104: ...alified technician XWWarning The 268XA chassis contains high voltages that can be dangerous or fatal Only qualified personnel should attempt to service the chassis 1 Disconnect all rear panel cables to the device power Universal Input modules and I O connectors 2 Remove the top cover The fuse is located on the Contoller Power supply board near the mains fuse holder 3 Remove the old fuse 4 Insert t...

Page 105: ...Maintenance DC Fuse Replacement 3 3 9 Fuse 4A 250V Slow 5MM X 20MM Bulk alg111f eps Figure 3 2 DC Fuse Location ...

Page 106: ...268XA Service Manual 3 10 ...

Page 107: ... Accuracy Test 4 11 Frequency Accuracy Test 4 11 Analog Channel Integrity Test 4 12 Open Thermocouple Response Test 4 12 2 Wire Resistance Accuracy Test PAI Optional 4 13 2 Wire Resistance Accuracy Test FAI Module Optional 4 14 4 Wire Resistance Accuracy Test PAI Module 4 16 4 Wire Resistance Accuracy Test FAI Module 4 19 Digital Input Output Tests 4 20 RS 232 Digital Input Output Test 4 20 Fluke ...

Page 108: ...268XA Service Manual 4 2 Fluke DAQ Totalizer Count and Enable Test 4 23 Fluke DAQ Totalizer Count and Direction Test 4 24 Fluke DAQ Totalizer Count and Debounce Test 4 24 ...

Page 109: ...m the test See Chapter 6 for a complete listing of the RS 232 commands See the 2680A 2686A Getting Started Guide or the 2680A 2686A Users Manual for information on using Fluke DAQ software Configuring the Performance Test Setup Configure the performance test setup as described below The performance test requires a complete network connection between the host computer and 268XA under test including...

Page 110: ...z 1 V rms 0 01 Ohms Ohms Accuracy 190Ω 0 005 1 9 kΩ 0 005 19 kΩ 0 005 190 kΩ 0 005 1 9 MΩ 0 005 Digital Multimeter General Purpose Measurement Fluke 77 Signal Generator Sine wave 0 5 to 1 V rms 10 Hz to 5 kHz Philips PM5193 Oscilloscope Alternative Equipment List Device Type Recommended Model Multiproduct Calibrator Fluke 5520 Do not use for FAI ohms calibration below 1 9 kΩ Function Signal Genera...

Page 111: ...et Hold down the COMM key on the device front panel and apply power to the device After the device beeps and momentarily displays rESEt Reset release the COMM key If any self test errors are reported on the front panel display refer to Self Test Diagnostics and Error Codes in this chapter Configuration Reset sets the device to the default parameters BCN 1 Line Frequency 60 and Isolated Network 2 S...

Page 112: ...ad to the common GND line For more information see Alarm Trigger I O Connections in Chapter 2 11 Connecting a DIO Module If you have a DIO option module connect a lead to each of the DIO lines 0 to 19 Connect leads to each relay line K1A to K8A hi lines Connect K1A to K8A low to GRD Connect a pair of leads to the totalizer input Accuracy Performance Tests The accuracy performance tests assume you ...

Page 113: ...r panel Connect a test lead to each line Master Alarm Trigger Output Trigger Input plus a test lead to the GND line 2 Measure Line Using a digital multimeter measure the output of the Master Alarm test lead referenced to the GND test lead to check if the voltage is greater than 3 8 V dc 3 Verify Configuration Channel 1 for V dc In Fluke DAQ verify channel 1 is configured for V dc 3 V range 4 Verif...

Page 114: ... checks the output signal line for correct logic operation RS 232 Trigger Output Test 1 Set Trigger Output Bit Use the TROUT command to set the Trigger Output bit through the RS 232 port This command turns on the output for about 200 µs 2 Verify Pulse Use a scope to verify the pulse is present Fluke DAQ Trigger Output Test 1 Configure Interval Trigger Using the Fluke DAQ software configure the sca...

Page 115: ... for V dc 90 mV range 2 Open Spy Open the Spy window under the Configuration dialog Select channel 1 for each PAI module you want to test 3 Verify Accuracy Configure the 5700A for the output values below and verify the measurement is between the minimum and maximum values Change the channel 1 range as required see Step 1 PAI Volts DC Range 5700A Output Minimum Reading Maximum Reading 90 mV Short C...

Page 116: ...asurement is between the minimum and maximum values Change the channel 1 range as required see Step 1 FAI Volts DC Range 5700A Output Minimum Reading Maximum Reading 90 mV Short Circuit Zero 0 000023 V 0 000023 V 90 mV 90 mV 0 089965 V 0 090035 V 90 mV 90 mV 0 090035 V 0 089965 V 300 mV Short Circuit Zero 0 00005 V 0 00005 V 300 mV 300 mV 0 29991 V 0 30009 V 300 mV 300 mV 0 30009 V 0 29991 V 3 V S...

Page 117: ... V 0 0215 V 300 mV 300 mV 1 kHz 0 29885 V 0 30115 V 300 mV 300 mV 100 kHz 0 2845 V 0 3155 V 3 V 3 V 1 kHz 2 9885 V 3 0115 V 30 V 30 V 1 kHz 29 885 V 30 115 V 300 V 300 V 1 kHz 298 85 V 301 15 V Frequency Accuracy Test The following procedure tests the accuracy of the frequency function for the PAI and FAI modules Measurement accuracy applies to all channels not just the channel used for the test 1...

Page 118: ...ds and very low resistance for shorted leads less than 10 Ω for the PAI or less than 1 kΩ for the FAI 5 Repeat Test for each Channel Repeat steps 2 to 4 for each channel 3 4 5 and so forth to channel 20 Open Thermocouple Response Test This test checks the Open Thermocouple response 1 Connect an 820 Ohm Test Resistor Remove the Universal Input module from the device and connect an 820 Ω resistor to...

Page 119: ... the Decade Resistance Source Tables are provided for both connections 2 Configure Channel 1 for Ohms In Fluke DAQ configure channel 1 for Ohms 2W 300 range 3 Open Spy Open the Spy window under the Configuration dialog 4 Verify Accuracy Configure the Decade Resistance Source for the output values below and verify the Spy window measurement is between the minimum and maximum values Change the chann...

Page 120: ...ng 2 terminals Measurement accuracy applies to all channels not just the channel used for the test The 4 wire resistance accuracy test is more rigorous and you may wish to skip this step and continue to 4 Wire Resistance Accuracy Test described later in this chapter 1 Connect the Resistance Source to Channel 1 Remove the Universal Input module from the device and connect a cable from the Decade Re...

Page 121: ...Short Circuit Zero 700 Ω 1 kΩ 30 kΩ 19 kΩ 19 686 kΩ 20 014 kΩ 300 kΩ 190 kΩ 189 60 kΩ 192 10 kΩ 3 MΩ 1 9 MΩ 1 8740 MΩ 1 9277 MΩ The resistance accuracy in this table makes allowance for up to 0 1 Ω of lead wire resistance You must add any additional lead wire resistance present in your setup to the resistance values given in this table Using the 5700A in 2 wire compensation mode eliminates much of...

Page 122: ...ion output instead of the Decade Resistance Source Tables are provided for both connections Refer to Figure 4 4 for the 5700A 4 wire connections 2 Configure Channel 1 for Resistance In Fluke DAQ configure channel 1 for Ohms 4W 300 range 3 Open Spy Open the Spy window under the Configuration dialog 12 11 13 14 15 16 17 18 19 20 2 1 3 4 5 6 7 8 9 10 SOURCE 4 WIRE SENSE 4 WIRE H L H L H L H L H L H L...

Page 123: ... WIRE H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L INPUT MODULE HI HI LO LO HI SENSE V AUX CURRENT GUARD GROUND WIDEBAND 5700A NC NC OUTPUT V A Ω Ω H L H L 5700A UUT Sense Sense Source Source EX GRD OFF 2 WIRE COMP OFF EX SNS ON alg70f eps Figure 4 4 4 Wire Connections to the Universal Input Module 5700A ...

Page 124: ...39 Ω 3 kΩ Short Circuit Zero 0 Ω 0 5 Ω 3 kΩ 2 9 kΩ 2 89849 kΩ 2 90137 kΩ 30 kΩ 29 kΩ 28 9834 kΩ 29 0166 kΩ 300 kΩ 290 kΩ 289 621 kΩ 290 379 kΩ 3 MΩ 2 9 MΩ 2 89146 MΩ 2 90854 MΩ The resistance accuracy in this table makes allowance for up to 0 01 decade resistance tolerance Resistance Range 5700A Minimum Reading Maximum Reading 300 Ω Short Circuit Zero 0 Ω 0 030 Ω 300 Ω 190 Ω 189 912 Ω 190 088 Ω 3 ...

Page 125: ...wire connections 2 Configure Channel 1 for Resistance In Fluke DAQ configure channel 1 for Ohms 4W 300 range 3 Open Spy Open the Spy window under the Configuration dialog 4 Verify Accuracy Configure the Decade Resistance Source for the output values below and verify the Spy window measurement is between the minimum and maximum values Change the channel 1 range as required see Step 2 Resistance Ran...

Page 126: ...r output and input functions See Figure 4 5 for the layout of the DIO connector module K2A K2B K1A K1B DIO 0 7 0 7 8 15 16 19 DIO 8 15 DIO 16 19 K5A K5B K4A K4B K3A K3B K8A Kn A RELAY DIAGRAM K8B B K7A K7B K6A K6B RELAYS DIGITAL I O 4V 30V MAX en alg57f eps Figure 4 5 DIO Connector Module RS 232 Digital Input Output Test To output bits use the DIO mask value command Set the mask to 1048575 Use the...

Page 127: ...rify that all of the signal lines are equal to or greater than 3 5 V dc 6 Toggle Each Line Toggle each line and verify that the signal line responds Verify that the correct lines are active DIO Relay Fuse Tests RS 232 DIO Relay Fuse Test Use the RS 232 command RELAY mask value command to verify operation of the relays The mask should always be set to 255 The value can be set from 1 to 255 dependin...

Page 128: ...and debounce is 0 for off 2 Initialize Totalizer to 0 Initialize the totalizer to 0 with the TOTINIT command 3 Read the Totalizer Value Read the totalizer value with the TOT command The value should be zero 4 Set DIO Set DIO 0 to 0 off which will enable the totalizer to count 5 Set the Generator Set the generator to 10 Hz and 1 V pp and connect to the totalizer input 6 Verify Totalizer Count Verif...

Page 129: ...le for correct operation Measurements of the signal lines may be made using a oscilloscope or a voltmeter Fluke DAQ Totalizer Count Test 1 Go to Spy Window Go to the Spy Window 2 Set Device Number Set the device number to the BCN number of the device and set the category as totalizer 3 Start Spy Start the Spy with the play button 4 Verify Totalizer Value Verify that the totalizer value is set to z...

Page 130: ... and 1 V pp and connect to the totalizer input 5 Verify Totalizer Count Verify that the totalizer count decreases by about 10 counts per second 6 Stop Spy Stop the Spy 7 Disconnect Signal Generator Disconnect the signal generator Fluke DAQ Totalizer Count and Debounce Test 1 Configure DIO In the Configuration dialog select the DIO from TreeView In the DIO Configuration dialog set the start count t...

Page 131: ...Preparing for Calibration 5 3 Ending Calibration 5 6 RS 232 Device Configuration Parameters 5 6 Manual Calibration Procedure 5 7 Manual Calibration Commands 5 9 V DC Calibration Procedure 5 10 V AC Calibration Procedure 5 12 Resistance Calibration Procedure 5 13 Frequency Calibration Procedure 5 15 ...

Page 132: ...268XA Service Manual 5 2 ...

Page 133: ...pair The calibration mode requires initialization through a built in calibration command To enter the calibration mode use the command CAL_MODE SPLUNGE When calibration is enabled the secondary display shows CAL To disable the calibration mode enter CAL_MODE OFF If you have entered calibration and wish to exit send CAL_MODE OFF or just turn the device power off You cannot stop calibration by enter...

Page 134: ...eview the baud rate or press and hold the COMM key for 3 seconds to set the baud rate the SET annunciator lights Press the up down arrow keys until rS232 is shown in the primary display comm is displayed in the secondary display Press the ENTER key bAud is displayed in the secondary display and the current baud rate in the primary display Press the up down arrow keys to select the desired number b...

Page 135: ...H L H L H L H L H L H L H L 1 11 2 12 3 13 4 14 5 15 6 16 7 17 8 18 9 19 10 20 H L CH1 H L CH11 f4 06 eps Figure 5 2 Universal Input Module Calibration Connections There are two connection methods used between the leads from the device Universal Input Module and the 5700A Calibrator The volts dc volts ac and resistance functions use the two wire connection shown in Figure 5 3 The resistance functi...

Page 136: ...on for Calibration Procedures Parameter Setting Channel Configuration Unique to calibration step Reading Rate Slow Trigger Type All disabled Intervals All disabled Drift Correction Enabled External Trigger Output Disabled Temperature Units Celsius Queue Overflow Mode Discard old Totalizer Debounce Disabled Autodisable Scanning On 12 11 13 14 15 16 17 18 19 20 2 1 3 4 5 6 7 8 9 10 SOURCE 4 WIRE SEN...

Page 137: ...running a terminal emulation program The following procedure assumes you will be using the Windows Terminal feature of your host computer If you are using a different terminal adapt this procedure to suit Complete the following procedure to prepare the Windows HyperTerminal feature 1 Complete the Preparing for Calibration procedure earlier in this chapter Note the device baud rate and host compute...

Page 138: ...268XA Service Manual 5 8 f4 06bmp bmp 5 Select the Terminal Preferences command from the Settings menu Check the boxes Local Echo and Outbound see below Click OK f4 08bmp bmp ...

Page 139: ...de Only CAL x y Start calibration of a new function where x module slot number 1 to 6 and y an integer from 1 to 4 For example CAL 1 1 to select module in slot one and V dc calibration 1 V dc 2 V ac 3 Resistance 4 Frequency Yes CAL Return identifier of currently active calibration procedure For example CAL Might return CAL 3 2 for active calibration of slot 3 in the V ac mode 0 No cal procedure cu...

Page 140: ...cedure The V dc calibration procedure calculates gain and offset calibration constants for all of the V dc ranges The 750 mV range is not user accessible but is used to measure the reference junction voltage and must be calibrated Complete the following procedure to manually calibrate the V dc function 1 If you have not already done so complete the procedure Preparing for Calibration earlier in th...

Page 141: ...mputes the calibration constant and returns the calibrated reading Allow several seconds 4 Resolve any calibration problems based on the following An execution error is returned by the CAL_STEP command if the full scale measurement is off by more than 5 from the target or if the zero measurement is off by more than 1 of full scale from the target When an error is detected the cal constant is not u...

Page 142: ...roblems based on the following An execution error is returned by the CAL_STEP command if the full scale measurement is off by more than 10 from the target or if the low scale measurement is off by more than 1 of full scale 10 from the target When an error is detected the cal constant is not updated and the procedure remains at the same step A device dependent error is returned by the CAL_STEP comm...

Page 143: ...EP 30 0000E 0 268XA computes the calibration constant and returns the calibrated reading Allow several seconds PAI only for remainder of steps CAL_REF 30 0000E 0 Use the 5700A to source 30 V ac 1 kHz CAL_STEP 30 0000E 0 268XA computes the calibration constant and returns the calibrated reading Allow several seconds CAL_REF 300 0000E 0 Use the 5700A to source 300 V ac 1 kHz CAL_STEP 300 0000E 0 268...

Page 144: ...from the target or if the zero measurement is off by more than 1 of full scale When an error is detected the cal constant is not updated and the procedure remains at the same step When CAL_STEP reports an execution error due to an out of range measurement it returns the raw measured reading to give you an indication of what was measured When CAL_STEP completes successfully it returns the reference...

Page 145: ... the calibration constant and returns the calibrated reading Allow several seconds Frequency Calibration Procedure The Frequency calibration procedure calculates a calibration constant that corrects for errors in the frequency counter crystal frequency It is sufficiently accurate to measure a single frequency point and calculate the scale factor assuming that the other endpoint is 0 Hz Complete th...

Page 146: ... measurement it returns the raw measured reading to give you an indication of what was measured When CAL_STEP completes successfully it returns the reference value A device dependent error is returned by the CAL_STEP command if an internal error such as a measurement timeout is detected When an error is detected the cal constant is not updated and the procedure remains at the same step An executio...

Page 147: ...11 Device Configuration 6 12 Command Set 6 13 Troubleshooting the Device 6 25 General Troubleshooting 6 25 Sys Ctrl PCA Troubleshooting 6 36 Troubleshooting the Sys Ctrl PCA Digital Kernel 6 36 Troubleshooting the RS 232 Interface 6 36 Troubleshooting the Ethernet Interface 6 37 Troubleshooting the Keypad Master Alarm Output Trigger Input and Trigger Out Lines 6 37 Troubleshooting the Power Supply...

Page 148: ...A D Converter Module Troubleshooting 6 42 A3 Kernel 6 42 Break Reset Circuit 6 43 Out of Tolerance Readings 6 43 Troubleshooting Relay Problems 6 44 A4 Analog Input PCA Troubleshooting 6 44 Troubleshooting Calibration Failures 6 44 Retrieving Calibration Constants 6 45 FlukeDAQ Software 6 47 ...

Page 149: ...ing paragraphs serves only as an introduction to SMT It is not recommended that repair be attempted based only on the information presented here Since sockets are seldom used with SMT shotgun troubleshooting cannot be used a fault should be isolated to the component level before a part is replaced Surface mount assemblies are probed from the component side The probes should make contact only with ...

Page 150: ...items FLASH ROM parameters communication parameters and calibration constants RAM Device and channel configuration plus RAM images of FLASH ROM parameters Ethernet Ethernet chip and static Ethernet RAM Display Display processor and display board Inguard Specific tests for ROM checksum RAM A D converter zero offset test reference balance test ohms overload test and open thermal couple Slot configur...

Page 151: ...urements unreasonable 10 0x00000200 Module 1 Reference balance measurements unreasonable 11 0x00000400 Module 1 Overload detection failed 12 0x00000800 Module 1 Open thermocouple detection failed 13 0x00001000 Communication parameter constants corrupt 14 0x00002000 Ethernet address corrupt 15 0x00004000 Ram constants corrupt 16 0x00008000 Ethernet chip failure 17 0x00010000 Module 2 Calibration co...

Page 152: ...asonable 43 0x00000800 Module 4 Reference balance measurements unreasonable 44 0x00001000 Module 4 Overload detection failed 45 0x00002000 Module 4 Open thermocouple detection failed 46 0x00004000 Module 5 Calibration constants corrupt 47 0x00008000 Module 5 Calibration Procedures Incomplete 48 0x00010000 Module 5 A D failure 49 0x00020000 Module 5 Zero offset measurements unreasonable 50 0x000400...

Page 153: ...he parameter sets is verified verifying all parameter sets at once is too CPU intensive The following parameter sets are checked FLASH ROM communication parameters FLASH ROM calibration constants FLASH ROM Ethernet address RAM device and channel configuration RAM pre computed range scaling and calibration constants used in evaluation RAM copy of calibration constants RAM copy of Ethernet address W...

Page 154: ... tools that can be selected from the menu each of which is described below Complete the following procedure to select the diagnostic tools 1 Power the device and allow it to complete the normal power on sequence 2 Press and hold the key for 3 seconds until tool appears in the secondary display Note that if you do not have a DIO module you will not be allowed to run these routines 3 Use the up down...

Page 155: ...f any relay line 1 Select the rELAy diagnostic tool using the procedure Selecting the Diagnostic Tool Menu 6 Use the left right arrows to select the desired relay line RLY7 to RLY0 The format is nnnn nnnn representing relay lines RLY7 to RLY0 respectively The secondary display shows the selected line for example RLY 7 7 Use the up down arrow keys to select the desired dio line status 0 or 1 8 In a...

Page 156: ... and channel functions 1 Select the conF diagnostic tool using the procedure Selecting the Diagnostic Tool Menu 2 Reading Rate Use the up down arrow keys to show rAtE in the primary display then press the key Using the up down arrow keys sequence through the reading rates SLO Slow FASt Fast and HALF Medium stopping at the desired rate then press 3 Select the conF diagnostic tool using Selecting th...

Page 157: ... t either The device also supports several commands for factory testing and several for software testing The RS 232 interface is also used to download the main software to flash The user can configure the function range and number of terminals for channel one only RS 232 can be used to get a measurement on channel one Other configuration elements cannot be set by the user through the RS 232 interf...

Page 158: ...ot be recognized i e syntax error the device returns the error prompt and does not do any more processing on that command or the remaining contents of the input queue If a query had already been processed on that line its response would be sent before the prompt If the input queue size is exceeded the device throws away all further input until it receives a terminator and generates a device depend...

Page 159: ... C Totalizer Debounce Disabled Disabled Housekeeping Drift Correction Enabled Disabled Inactive Client Scan Disable Enabled Enabled The prompts provide error information The TST query provides failure information Power on selftest results can be retrieved with the SELFTEST query Command Set The device RS 232 command set is shown in Table 6 7 RS 232 Command Set The calibration commands are describe...

Page 160: ...ule CAL_MODE Enable disable cal mode FUNC Configure function range terminals for channel one of specified input module FUNC Query function range terminals for channel one of specified input module MEAS Trigger and query a measurement on channel of previously chosen input module DIO Set the value of the DIO digital lines 0 through 19 DIO Get the value of the DIO digital lines 0 through 19 RELAY Set...

Page 161: ...onfiguration RATE Set the scan Speed FAST MEDIUM SLOW RATE Get the scan Speed FAST MEDIUM SLOW SERIAL Get the serial number for the chassis AI module or DIO TRIN Query the state of the chassis trigger in line TROUT Pulse the chassis trigger out line low for 200uS MAOUT Force the Master Alarm ON or OFF The RS232 commands are described in this chapter using the following format Command The command n...

Page 162: ...Response None Restrictions None Notes If RST is used in calibration mode 268XA exits calibration mode If RST is used to exit calibration mode before the completion of a calibration procedure for a function V dc V ac OHMS FREQ any new calibration constants for that function will not be saved Command TST Description Self test query Initiates asynchronous self test blocking while it executes and then...

Page 163: ...ecution error if not in the Calibration Mode This command returns a device dependent error if an internal error such as a guard crossing error is detected while attempting to determine the device type This command returns a device dependent error if it is unable to set the default cal configuration This could happen if scanning was enabled via the network interface after the cal procedure was init...

Page 164: ...e allowable limits for each reference are specified for each procedure in the Calibration Procedures section This command returns an execution error if no cal procedure is active Command CAL_REF Description Query the present calibration reference value Parameters None Response reference value reference value floating point number Restrictions Calibration mode only Notes This command returns an exe...

Page 165: ...cription Query the calibration date for a particular module Parameters module number integer 1 6 Response MM DD YYYY HH MM SS 000 ie 4 5 2002 09 06 32 000 Restrictions None Notes None Command FUNC channel function range terminals FUNC channel TC thermocouple type check OTC flag FUNC channel THERM AUTO terminals coeff a coeff b coeff c FUNC channel RTD AUTO terminals R0 value alpha value Descriptio...

Page 166: ...pt 3 30 V 30 V 30 V 30 V 30 kΩ 30 kΩ 30 kΩ opt 4 50 V 300 V 150 V na 300 V 300 kΩ 300 kΩ 300 kΩ opt 5 90 mV 90 mV na na 3 MΩ 3 MΩ 3 MΩ opt 6 750 mV 750 mV na na na na na opt Command FUNC channel Description Query the measurement function range and number of terminals for a channel Parameters channel 1xx 2xx 3xx 4xx 5xx 6xx where xx 01 20 Response function range terminals function OFF V dc V ac OHM...

Page 167: ...y E a signed exponent of 3 0 3 or 6 For example 115 67E 0 An overload condition is indicated by a value of 001 00E 9 or 001 00E 9 in the FAI 001 000E 9 or 001 000E 9 for the PAI Restrictions Not allowed in calibration mode If the channel is not configured the channel is not one listed above or the input module is not installed this command generates an execution error and does not return a value N...

Page 168: ...lays Set 2 Relays 2 Set all other Relays Reset 3 Relays 1 and 2 Set all other Relays Reset 255 all Relays Set Note on DIO Relays Digital lines programming Serial control for the individual DIO Relays or Digital lines is based on bit values For the relays the firmware decided that 1 is reset and 0 is set for the digital lines 1 is high and 0 is low Relay 1 DIO line 0 has bit value 2 0 1 Relay 2 DIO...

Page 169: ...ters direction 0 for down 1 for up debounce 0 for off 1 for on Response None Restrictions None Notes None Command TOTCFG Description Get the value of the DIO Totalizer configuration Parameters None Response direction 0 for down 1 for up debounce 0 for off 1 for on Restrictions None Notes For direction 0 decrement and count 0 with totalizer line pulsed the TOT count will wrap 2 32 Command RATE modu...

Page 170: ... module Parameters module integer from 1 to 6 Response programmed serial Restrictions None Notes Use IDN To retrieve chassis serial number Command TRIN Description Query the state of the Chassis Trigger In line Parameters none Response 0 for high state 1 for low state Restrictions None Notes None Command TROUT Description Pulse the Chassis Trigger Out line low for 200usec Parameters none Response ...

Page 171: ...ng faults require sleuthing that is beyond the scope of this manual For these cases review Chapter 2 Theory of Operation and approach the difficulty in a logical manner adapting the troubleshooting procedures as required As a last resort contact Fluke see Chapter 7 for assistance General Troubleshooting General troubleshooting uses the device response to self test as a clue to the fault location I...

Page 172: ...sing or is corrupted and must be reloaded This failure is detected by a boot monitor condition which means the boot software completed but the main software did not take over device operation Correction Reloading the main software is discussed in Updating Embedded Device Firmware later in this chapter Also see Troubleshooting the Digital Kernel 3 RAM test failure Sys Ctrl PCA Background The System...

Page 173: ...rror to occur the A2 Display PCA did not respond to the SYS CTRL microprocessor request to run a self test Neither pass nor fail was reported as if the A2 Display PCA is dead or missing Correction Check the ribbon cable connection P8 between Backplane and the display board Also check back to the P7 connector on the SYS CTRL PCA Check the power supply levels to the A2 Display PCA Refer to paragraph...

Page 174: ...ule PCA is dead or missing Correction Check that the module is properly plugged into the backplane Next check that the power levels to the module are the correct levels Finally check that the power supply voltages generated by the power circuitry on the module is generating the correct level of voltage The SYS CTRL FPGA could be damaged for the interface with the module PCA or possibly the optics ...

Page 175: ... failure 11 Module 1 overload detection failed A3 A D Converter PCA Background This self test is created by configuring for an ohms measurement with treeing relays pulled in but no channel relays are set This creates an overload measurement as the A D converter tried to measure the resistance of an open circuit Failure The error occurs when the A D converter did not detect an overload condition fo...

Page 176: ...he overload detection the self test does not set any channel relays and the detection circuit should detect the open thermocouple Also check the relays in the circuit path 13 Communication parameters corrupt Sys Ctrl PCA Background The SYS CTRL stores the RS 232 communication parameters baud rate in the flash memory and receives transmits data through U8 to the microprocessor U6 Failure For this e...

Page 177: ...e Ethernet transceiver SYS CTRL T1is suspect If Ethernet does not operate over 10 or 100Base T interface then SYS CTRL U17 is suspect Also check SYS CTRL U20 for I O and memory decoding See Troubleshooting the Digital Kernel for more information 17 Module 2 Calibration constants corrupt Module PCA Background Same as for module 1 Failure Same as for module 1 Correction Same as for module 1 18 Modul...

Page 178: ...for module 1 Correction Same as for module 1 35 Module 3 Zero offset measurements unreasonable Module PCA Background Same as for module 1 Failure Same as for module 1 Correction Same as for module 1 36 Module 3 Reference balance measurements unreasonable Module PCA Background Same as for module 1 Failure Same as for module 1 Correction Same as for module 1 37 Module 3 Overload detection failed Mod...

Page 179: ...me as for module 1 Correction Same as for module 1 45 Module 4 Open thermocouple detection failed Module PCA Background Same as for module 1 Failure Same as for module 1 Correction Same as for module 1 46 Module 5 Calibration constants corrupt Module PCA Background Same as for module 1 Failure Same as for module 1 Correction Same as for module 1 47 Module 5 Calibration Procedures Incomplete Module...

Page 180: ...s for module 1 55 Module 6 A D failure Module PCA Background Same as for module 1 Failure Same as for module 1 Correction Same as for module 1 56 Module 6 Zero offset measurements unreasonable Module PCA Background Same as for module 1 Failure Same as for module 1 Correction Same as for module 1 57 Module 6 Reference balance measurements unreasonable Module PCA Background Same as for module 1 Fail...

Page 181: ...of the modules Power the device again If this time the device goes into self test then you need to troubleshoot the modules and look for the load that is pulling the power supply down See Power Supply Troubleshooting Power Supply look for overwarm devices Dead A2 Display PCA It may appear that self test didn t begin because the display is dead and therefore didn t shown anything To verify the disp...

Page 182: ...e in the outboard devices then probe them with a logic analyzer or oscilloscope looking for missing signals or dc power or by touch to find a device that is excessively warm Be careful to touch only the case of the device and not the pins These devices include SYS CTRL U20 Flash Memory SYS CTRL U18 22 Static RAM SYS CTRL U31 real time Clock SYS CTRL U1 Power Monitor SYS CTRL U20 WE Flash write ena...

Page 183: ... are problems with loading of the trigger output line check SYS CTRL Q1 or Q2 Troubleshooting the Power Supply To troubleshoot the power supply circuits check each voltage proceeding from the raw dc supply through the 5V switcher and subsequent regulator circuits If one of the supplies is folded back due to excessive current draw remove PCBs from the SYS CTRL card to see if this unloads the power ...

Page 184: ...tons are pressed proceed directly to step 9 1 Check the three power supplies with respect to GND on the Display Assembly Vcc A2U1 21 4 9 V dc Vee A2U1 4 5 0 V dc Vload A2U1 5 30 0 V dc 2 Check the filament drive signals FIL1 and FIL2 these connect to the last two pins on each end of A2DS1 These signals should be 5 4 V ac with FIL2 biased to be about 6 8 V dc higher than the Vload supply nominally ...

Page 185: ...hen an anode signal is at Vcc and a grid signal is at Vcc the corresponding segment on the display is illuminated 9 If the Microprocessor has difficulty recognizing front panel button presses the switch scanning signals SWR1 through SWR6 should be checked When no switch contacts are being closed the switch scanning lines should have about 20 kΩ of resistance between each other through two 10 kΩ pu...

Page 186: ...7 is a 2Kbit serial EEPROM addressable from the out guard microprocessor SYS CTRL PCA via an SPI bus that runs on the Backplane PCA Communication with any A D power module only occurs after a module has been initialized There after communication occurs every scan cycle DIO Module Troubleshooting To access this card for test the user may need the 2680A 7001K Extender kit PN 1619174 No calibration i...

Page 187: ...n references only the components that are used for the Digital Output DO 0 The Microprocessor controls the state of the Digital Output Driver DO 0 by setting the level of the output U4 Pin 59 When U4 Pin 59 is set high the output of the open collector Darlington driver U13 Pin 13 sinks current through current limiting resistor R80 When U4 Pin 59 is set low the driver output turns off and is pulled...

Page 188: ...ination of the internal counter and a 16 bit storage register internal to the micro controller Totalizer Enable Operation of the Totalizer is controlled by the TOT_ENABLE signal The Totalizer Enable signal is active high Applying a logic low to TOT_ENABLE will disable counting by the Totalizer TP_ENABLE is the control signal to the micro controller U4 Pin 8 Totalizer counting is enabled when this ...

Page 189: ... due to too long a cycle between device calibrations or due to a failure Clues come from the range and function where the problem occurs If the problem is all functions and all ranges this points to A D converter problems in particular the precision voltages used for measurements To locate problem complete the Performance Test in Chapter 4 and note which parameters are out of tolerance If all para...

Page 190: ... blocks with the exception of a small active network formed around A4Q1 that provides a temperature reference for thermocouple measurements If thermocouple measurements are out of tolerance A4Q1 may be suspect To verify the operation of A4Q1 connect multimeter test leads across A4R2 marked and clearly visible in the open module and power the device At normal room temperatures the voltage across A4...

Page 191: ...ion rules Independent calibration of any function results in the storage of calibration constants for that function only Once calibration is begun all steps for that function must be completed before the calibration constants are stored If all steps are not completed and the procedure is terminated no constants for that function are stored only calibration constants for previously completed functi...

Page 192: ...E 0 24 V ac 300 mV Gain 0 90000E 0 1 10000E 0 26 V ac 300 mV Offset 0 00300E 0 0 00300E 0 28 V ac 3 V Gain 0 90000E 0 1 10000E 0 30 V ac 3 V Offset 0 03000E 0 0 03000E 0 32 V ac 30 V Gain 0 90000E 0 1 10000E 0 34 V ac 30 V Offset 0 30000E 0 0 30000E 0 36 V ac N A FAI 150 300 V PAI Gain 0 90000E 0 1 10000E 0 38 V ac N A FAI 150 300 V PAI Offset 3 00000E 0 3 00000E 0 40 Resistance 300 Ω Gain 0 95000...

Page 193: ...t software downloads and then data acquisition At the time of this printing the versions of code are as follows main embedded code 01_00 vxWorks FPGA code fpga_rev71 rbf GUI FlukeDAQ2_02 exe a self extracting Windows application Main Firmware This is a closed case procedure and it is not necessary to open the device to load the Main Firmware The Main Firmware is identical for both model devices Ma...

Page 194: ...268XA Service Manual 6 48 ...

Page 195: ...7 1 Chapter 7 Replaceable Parts Title Page Introduction 7 3 How to Obtain Parts 7 3 Service Centers 7 3 Parts Lists 7 4 ...

Page 196: ...268XA Service Manual 7 2 ...

Page 197: ...andler Contact your Fluke service center for recycling information How to Obtain Parts Electrical components may be ordered from the Fluke Corporations and its authorized representatives by using the part number designated in the replacement parts lists To order parts directly from Fluke Corporation call toll free 1 800 526 4731 Outside the US replacement parts can be ordered through your local se...

Page 198: ...268XA Service Manual 7 4 Parts Lists The following tables list the replaceable parts for the 268XA devices Caution PCAs may be subject to damage by static discharge ...

Page 199: ...23 A64MP15 2680a 2007 TOP COVER 13 1593089 A64MP16 2680A 2018 CAPACITOR RETAINER 13 1610329 A64MP14 2680a 2003 BOTTOM COVER 13 1610334 A64MP18 2680A 2004 REAR PANEL 13 1610341 A64MP13 2680A 2005 TRANSFORMER HOLD DOWN 13 1665293 A64MP20 2680A 2012 FAN BRACKET 13 1999161 A64MP21 2680A 2022 DISPLAY BRACKET 14 1629530 A64MP4 5 2680A 8005 INSERT PLASTIC SIDE 15 1886377 LABEL 268X ROYALTY VX WORKS 16 W ...

Page 200: ...IPS STEEL ZINC CLEAR LOCK 43 114116 SCREW SCREW FH P LOCK STL 8 32 375 44 494641 SCREW SCREW WH P THD FORM STL 5 20 312 46 320093 SCREW SCREW FHU P LOCK MAG SS 6 32 250 51 1595629 CAPACITOR ELECTROLYTIC ALUMINUM 22000UF 20 50V 35X50 CASE WITH 4 LEADS BULK 52 1606839 CAPACITOR ELECTROLYTIC ALUMINUM 470UF 20 63V LOW IMPEDANCE 12 5X30RADIAL BULKPurchased Item 53 1631800 CONNECTOR TERMINAL BLOCK 5MMCT...

Page 201: ...RONT PANEL 13 1593023 A64MP15 2680a 2007 TOP COVER 13 1593089 A64MP16 2680A 2018 CAPACITOR RETAINER 13 1610329 A64MP14 2680a 2003 BOTTOM COVER 13 1610334 A64MP18 2680A 2004 REAR PANEL 13 1610341 A64MP13 2680A 2005 TRANSFORMER HOLD DOWN 13 1665293 A64MP20 2680A 2012 FAN BRACKET 13 1999161 A64MP21 2680A 2022 DISPLAY BRACKET 14 1629530 A64MP4 5 2680A 8005 INSERT PLASTIC SIDE 15 1886377 LABEL 268X ROY...

Page 202: ...CREW 6 32 250 PAN PHILLIPS STEEL ZINC CLEAR LOCK 42 152173 SCREW 6 32 500 PAN PHILLIPS STEEL ZINC CLEAR LOCK 43 114116 SCREW SCREW FH P LOCK STL 8 32 375 44 494641 SCREW SCREW WH P THD FORM STL 5 20 312 45 1886599 SPACER ROUND SOLID 438 HEIGHT 270 OD NYLON SNAP 46 320093 SCREW SCREW FHU P LOCK MAG SS 6 32 250 47 1572080 CONNECTOR PC CARD HEADER 4 3MM HIGH BOTTOM MNT RT ANG PLUG RT BUTTON 68 PIN TR...

Page 203: ...C3 LINE CORD CONT EURO 10A CEE 7 IEC 1MM 3 2 5M 63 1777348 CONNECTOR ACCESSORY D SUB JACK SCREW 4 40 250 L W FLAT WASHER 65 172080 CABLE ACCESSORY CABLE ACCESS TIE 4 00L 10W 75 DIA 66 1777885 CABLE ASSEMBLY 8 COND 8 POS MOD PLUG EACH END CAT5E CROSSOVER RED 2M BULK 67 871512 2620A 4406 T C CABLE ASSY 68 1631254 MANUAL 2680A 2686A GETTING STARTED ...

Page 204: ...268XA Service Manual 7 10 268X FINAL ASSEMBLY alg105f eps Figure 7 1 268XA Final Assembly ...

Page 205: ...3 Blank Module Parts List Number Part Number Reference Designator Description 2 1593050 2680A 2015 MODULE REAR PANEL 3 1669653 2680A 2013 BLANK MODULE BRACKET 4 1669889 2680A 8011 BLANK MODULE DECAL 2680A BLANK alg101f eps Figure 7 2 Blank Module ...

Page 206: ...8 DIO MODULE BASE 8 152140 SCREW 6 32 250 PAN PHILLIPS STEEL ZINC CLEAR LOCK 9 1593197 2680A 4031 PCA A D POWER SUPPLY 10 1599011 2680A 4062 PCA OUTPUT 11 698027 Y9XXX 8002 BAG LARGE ACCESSORY 12 874107 2620A 2007 ISOTHERMAL CASE BOTTOM 13 874110 2620A 2008 ISOTHERMAL CASE TOP 14 876479 SCREW SCREW KNURL SL CAPT STL 6 32 500 15 1592575 2680 3032 PCB A D TRANSFORMER 16 1599066 MAGNETIC MATERIAL FER...

Page 207: ...Replaceable Parts Parts Lists 7 7 13 2680A DIO alg100f eps Figure 7 3 DIO Module ...

Page 208: ...203 2645A 4003M A D PWB ASSY FFE 10 757294 A45MP95 96 JUMPER JUMPER REC 2 POS 100CTR 025 SQ POST 11 1593197 2680A 4031 PCA A D POWER SUPPLY 12 949537 2620A 4004A INPUT PWB ASSY A4 13 698027 Y9XXX 8002 BAG LARGE ACCESSORY 14 874107 2620A 2007 ISOTHERMAL CASE BOTTOM 15 874110 2620A 2008 ISOTHERMAL CASE TOP 16 1669892 2680A 8012 ISOTHERMAL CASE DECAL 17 876479 SCREW SCREW KNURL SL CAPT STL 6 32 500 1...

Page 209: ...Replaceable Parts Parts Lists 7 7 15 2680A FAI alg102f eps Figure 7 4 FAI Module ...

Page 210: ...MODULE BASE 10 757294 A40MP95 96 JUMPER JUMPER REC 2 POS 100CTR 025 SQ POST 11 1593197 2680A 4031 PCA A D POWER SUPPLY 12 939744 A40MP260 2640A 2007 COVER RELAYS 13 949537 2620A 4004A INPUT PWB ASSY A4 14 698027 Y9XXX 8002 BAG LARGE ACCESSORY 15 874107 2620A 2007 ISOTHERMAL CASE BOTTOM 16 874110 2620A 2008 ISOTHERMAL CASE TOP 17 1669892 2680A 8012 ISOTHERMAL CASE DECAL 18 876479 SCREW SCREW KNURL ...

Page 211: ...Replaceable Parts Parts Lists 7 7 17 2680A PAI alg103f eps Figure 7 5 PAI Module ...

Page 212: ...PWB ASSY A4 274 698027 A14MP90 Y9XXX 8002 BAG LARGE ACCESSORY 281 874107 A14MP2 2620A 2007 ISOTHERMAL CASE BOTTOM 282 874110 A14MP3 2620A 2008 ISOTHERMAL CASE TOP 389 1669892 2680A 8012 ISOTHERMAL CASE DECAL 398 876479 A14H65 SCREW SCREW KNURL SL CAPT STL 6 32 500 998 1259450 FACTORY BASE WARRANTY 1 YEAR 2620A 180 alg104f eps Figure 7 6 Isothermal Input ...

Page 213: ...oller System Power PCA 8 5 8 3 Digital I O PCA 8 11 8 4 Backplane Extender PCA 8 15 8 5 Extender PCA 8 17 8 6 A D Supply Assembly 8 19 8 7 PCMCIA PCA 8 21 8 8 Output PCA 8 23 8 9 A D PFE PCA 8 25 8 10 A D FFE PCA 8 32 8 11 Analog Input Connector PCA 8 39 8 12 Display PCA 8 41 ...

Page 214: ...268XA Service Manual 8 2 ...

Page 215: ...8 3 8 Schematic Diagrams Figure 8 1 Backplane PCA 2680A 4001 ...

Page 216: ...268XA Service Manual 8 4 Figure 8 1 Backplane PCA cont 2680A 1001 ...

Page 217: ...8 5 8 Schematic Diagrams Figure 8 2 Controller System Power PCA 2680A 4004 ...

Page 218: ...L15 M5 M15 N5 N15 P4 P5 P15 P16 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 T14 F6 F7 F8 F9 F10 F11 F12 F13 F14 G6 G7 G8 G9 G10 G11 G12 G13 G14 H6 H7 H8 H9 H10 H11 H12 H13 H14 J6 J7 J8 J9 J10 J11 J12 J13 J14 K6 K7 K8 K9 K10 K11 K12 K13 K14 L6 L7 L8 L9 L10 L11 L12 L13 L14 M6 M7 M8 M9 M10 M11 M12 M13 M14 N6 N7 N8 N9 N10 N11 N12 N13 N14 P6 P7 P8 P9 P10 P11 P12 P13 P14 240_AC U27 20 10 REF DES PARTNAME VCC...

Page 219: ...V SD AMD1385ARS U7 DD 0 1U C150 0 1U C19 0 1U C148 0 1U C149 P5 TX RX TG110 S050N2 T1 VCC C82 0 1U 0 1U C155 TP5 TP7 TP8 TP9 TP10 TP11 RED GREEN LED 591 3001 DS1 DS5 591 2101 DS3 591 2101 180P C119 180P C139 180P C36 180P C140 180P C173 180P C174 IN IN OUT BI IN IN IN IN BI IN BI OUT IN IN IN IN OUT OUT IN BI BI OUT IN IN IN OUT IN OUT OUT IN IN IN IN IN OUT IN IN OUT IN IN IN IN 8 3 D 6 7 5 4 1 2...

Page 220: ... 3 of 5 7 8 19 16 26 93 4 5 3 2 3 5 7 9 19 17 15 13 11 12 14 16 18 1 8 6 4 2 4 1 4 1 3 2 4 1 3 2 3 2 4 1 12 14 16 18 1 8 6 4 2 3 5 7 9 19 17 15 13 11 3 2 4 1 3 2 4 3 1 2 48 1 12 2 9 3 6 5 8 11 37 47 40 46 43 44 41 38 25 24 23 17 20 22 13 14 19 16 26 32 29 27 36 35 30 33 48 1 11 12 9 8 2 3 5 6 38 37 40 41 47 46 44 43 25 24 13 14 16 17 19 20 22 23 36 35 33 32 30 29 27 26 48 1 2 3 9 8 6 5 12 11 47 46...

Page 221: ...IO VCCIO VCCIO VCCIO VCCIO VCCIO VCCIO VCCIO VCCIO VCCIO VCCIO VCCIO VCCINT VCCINT VCCINT VCCINT VCCINT VCCINT VCCINT VCCINT VCCINT VCCINT VCCINT DATA0 DATA1 DATA3 DATA4 DATA5 DATA2 DATA6 DATA7 DEV OE CS CS RS WS DEV_CLR CLKUSR U25 EP1K100QC208 0 01U C109 0 01U C106 0 01U C103 0 01U C100 0 01U C97 0 01U C94 0 01U C91 0 01U C87 0 01U C77 0 01U C73 0 01U C68 0 01U C55 0 01U C48 10U C43 0 01U C112 VC...

Page 222: ...0 01U C101 0 01U C105 0 01U C102 0 01U C98 0 01U C95 0 01U C99 0 01U C96 0 01U C92 0 01U C88 0 01U C93 0 01U C89 0 01U C83 0 01U C78 0 01U C84 0 01U C79 0 01U C74 0 01U C69 0 01U C75 0 01U C70 0 01U C64 10U C49 0 01U C65 10U C52 L49 70 OHM VCC L50 70 OHM 3 3U C154 MMBD7000 CR304 MMBD7000 CR305 MMBD7000 CR312 WP3 180P C157 WP11 WP12 WP13 180P C158 180P C159 180P C160 P9 0 01U C30 0 01U C31 0 01U C3...

Page 223: ...8 11 8 Schematic Diagrams Figure 8 3 Digital I O PCA 2680A 4006 ...

Page 224: ...268XA Service Manual 8 12 Figure 8 3 Digital I O PCA cont 2680A 1006 1 of 3 ...

Page 225: ...8 13 8 Schematic Diagrams Figure 8 3 Digital I O PCA cont 2680A 1006 2 of 3 ...

Page 226: ...268XA Service Manual 8 14 Figure 8 3 Digital I O PCA cont 2680A 1006 3 of 3 ...

Page 227: ...8 15 8 Schematic Diagrams Figure 8 4 Backplane Extender PCA 2680A 4009 ...

Page 228: ...268XA Service Manual 8 16 Figure 8 4 Backplane Extender PCA cont 2680A 1009 ...

Page 229: ...8 17 8 Schematic Diagrams Figure 8 5 Extender PCA 2680A 4010 ...

Page 230: ...268XA Service Manual 8 18 Figure 8 5 Extender PCA cont 2680A 3010 ...

Page 231: ...8 19 8 Schematic Diagrams Figure 8 6 A D Supply Assembly 2680A 4031 ...

Page 232: ...268XA Service Manual 8 20 Figure 8 6 A D Supply Assembly cont 2680 1031 ...

Page 233: ...8 21 8 Schematic Diagrams Figure 8 7 PCMCIA PCA 2680A 4041 ...

Page 234: ...268XA Service Manual 8 22 Figure 8 7 PCMCIA PCA cont 2686 1041 ...

Page 235: ...8 23 8 Schematic Diagrams Figure 8 8 Output PCA 2680A 4062 ...

Page 236: ...268XA Service Manual 8 24 Figure 8 8 Output PCA cont 2680A 1062 ...

Page 237: ...8 25 8 Schematic Diagrams Figure 8 9 A D PFE PCA 2640A 4003 ...

Page 238: ...268XA Service Manual 8 26 Figure 8 9 A D PFE PCA cont 1 of 6 ...

Page 239: ...8 27 8 Schematic Diagrams Figure 8 9 A D PFE PCA cont 2 of 6 ...

Page 240: ...268XA Service Manual 8 28 Figure 8 9 A D PFE PCA cont 2640A 1003 3 of 6 ...

Page 241: ...8 29 8 Schematic Diagrams Figure 8 9 A D PFE PCA cont 2640A 1003 4 of 6 ...

Page 242: ...268XA Service Manual 8 30 Figure 8 9 A D PFE PCA cont 2640A 1003 5 of 6 ...

Page 243: ...8 31 8 Schematic Diagrams Figure 8 9 A D PFE PCA cont 2640A 1003 6 of 6 ...

Page 244: ...268XA Service Manual 8 32 Figure 8 10 A D FFE PCA 2645A 4003 ...

Page 245: ...8 33 8 Schematic Diagrams Figure 8 10 A D FFE PCA cont 2645A 1003 1 of 6 ...

Page 246: ...268XA Service Manual 8 34 Figure 8 10 A D FFE PCA cont 2645A 1003 2 of 6 ...

Page 247: ...8 35 8 Schematic Diagrams Figure 8 10 A D FFE PCA cont 2645A 1003 3 of 6 ...

Page 248: ...268XA Service Manual 8 36 Figure 8 10 A D FFE PCA cont 2645A 1003 4 of 6 ...

Page 249: ...8 37 8 Schematic Diagrams Figure 8 10 A D FFE PCA cont 2645A 1003 5 of 6 ...

Page 250: ...268XA Service Manual 8 38 Figure 8 10 A D FFE PCA cont 700p29_topress zip 2645A 1003 6 of 6 ...

Page 251: ...8 39 8 Schematic Diagrams Figure 8 11 Analog Input Connector PCA 2620A 4004A ...

Page 252: ...268XA Service Manual 8 40 2620A 1004 Figure 8 11 Analog Input Connector PCA cont ...

Page 253: ...8 41 8 Schematic Diagrams Figure 8 12 Display PCA 1 of 1 ...

Page 254: ...268XA Service Manual 8 42 Figure 8 12 Display PCA cont 1 of 1 ...

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