Measurement Computing USB-TEMP, User Manual

Page 1: ......

Page 2: ...USB TEMP Measurement Advantage brand USB based High Precision 8 Channel Temperature Measurement Module User s Guide Document Revision 2 March 2005 Copyright 2005 Measurement Computing Corporation...

Page 3: ...workmanship for the life of the product Products found defective are repaired or replaced promptly Lifetime Harsh Environment Warranty We will replace any product manufactured by Measurement Computing...

Page 4: ...respective owners Information furnished by Measurement Computing Corporation is believed to be accurate and reliable However no responsibility is assumed by Measurement Computing Corporation neither f...

Page 5: ...pter 3 Sensor Connections 3 1 Screw terminal pin out 3 1 Sensor input terminals C0H C0L to C7H C7L 3 2 Current excitation output terminals I1 to I4 3 2 Four wire two sensor common terminals 4W01 to 4W...

Page 6: ...uple measurement accuracy 5 3 Semiconductor sensor measurement accuracy 5 3 RTD measurement accuracy 5 4 Thermistor measurement accuracy 5 4 Throughput rate 5 5 Digital input output 5 6 Memory 5 6 Mic...

Page 7: ...italic text Italic text indicates the names of manuals and help topic titles and to emphasize a word or phrase For example The InstaCal installation procedure is explained in the DAQ Software Quick St...

Page 8: ......

Page 9: ...r sensor categories Thermocouple types J K R S T N E and B Resistance temperature detectors RTDs 2 3 or 4 wire measurements of 100 platinum RTDs Thermistors 2 3 or 4 wire measurements Semiconductor te...

Page 10: ...ensor I O Isolator 500 V Isolation Barrier USB Micro USB SPI Isolated DC DC USB 5V 12 12 8 DIO Figure 1 1 USB TEMP functional block diagram Software features The following software ships with the USB...

Page 11: ...switches to set or interrupts to configure You can connect the USB TEMP before or after you install the software and without powering down your computer first When you connect an HID to your system y...

Page 12: ......

Page 13: ...ems should be included with your shipment USB TEMP USB cable 2 meter length Software The Measurement Computing Data Acquisition Software CD contains the following software InstaCal installation calibr...

Page 14: ...tention of Tech Support Email techsupport measurementcomputing com Installing the software Refer to the DAQ Software Quick Start for instructions on installing the software on the Measurement Computin...

Page 15: ...ions are loaded on power up Default configuration The factory default configuration is Disabled The Disabled mode disconnects the analog inputs from the terminal blocks and internally grounds all of t...

Page 16: ......

Page 17: ...w terminal pin out The USB TEMP has four rows of screw terminals two rows on the top edge of the housing and two rows on the bottom edge Each row has 26 connections Between each bank of screw terminal...

Page 18: ...output 47 5V 5V output 22 GND Ground 48 GND Ground 23 DIO0 Digital Input Output 49 DIO7 Digital Input Output 24 DIO1 Digital Input Output 50 DIO6 Digital Input Output 25 DIO2 Digital Input Output 51 D...

Page 19: ...to eight digital I O lines to the screw terminals labeled DIO0 to DIO7 Each terminal is software configurable for input or output CJC sensors The USB TEMP has two built in high resolution temperature...

Page 20: ...ilt in current excitation sources I1 to I4 for measuring resistive type sensors Each current excitation terminal is dedicated to one channel pair The USB TEMP makes two three and four wire measurement...

Page 21: ...e made internally When configured for two wire mode both sensors must be connected to obtain proper measurements Three wire configuration A three wire configuration compensates for lead wire resistanc...

Page 22: ...Figure 3 6 and Figure 3 7 You can configure the USB TEMP with either a single sensor per channel or two sensors per channel pair Four wire single sensor A four wire single sensor connected to the firs...

Page 23: ...floating point value in either voltage or temperature Digital I O connections You can connect up to eight digital I O lines to the screw terminals labeled DIO0 to DIO7 You can configure each digital b...

Page 24: ......

Page 25: ...algorithm automatically corrects for the additional thermocouples created at the terminal blocks by subtracting the calculated cold junction voltage from the analog input s thermocouple voltage measur...

Page 26: ...rature value The measurement is returned by software as a 32 bit floating point value in a voltage resistance or temperature format Data linearization An on board microcontroller automatically perform...

Page 27: ...or the various sensor categories Semiconductor sensor 0 to 2 5 V Absolute maximum input voltage C0x through C7x relative to GND pins 9 19 28 38 25V power on 40 V power off Input impedance 5 Gigohm min...

Page 28: ...of temperature sensor Mixing different sensor types of the same category such as a type J thermocouple on channel 0 and a type T thermocouple on channel 1 is valid Note 2 Channel configuration informa...

Page 29: ...bove assumes the screw terminals are at the same temperature as the CJC sensor Errors shown do not include inherent thermocouple error Please contact your thermocouple supplier for details on the actu...

Page 30: ...cross the current excitation Ix pins which is the sum of the RTD resistance and the lead resistances Note 10 For accurate three wire compensation the individual lead resistances connected to the Ix pi...

Page 31: ...the total resistance across the current excitation Ix pins which is the sum of the thermistor resistance and the lead resistances Note 13 For accurate three wire compensation the individual lead resis...

Page 32: ...ut low voltage IOL 2 5 mA 0 7 V max Output high voltage IOH 2 5 mA 3 8 V min Note 15 All ground pins on the USB TEMP pins 9 19 28 38 are common and are isolated from earth ground If a connection is ma...

Page 33: ...re root port hubs All externally powered root port hubs desktop PC s provide up to 500 mA of current for a USB device Battery powered root port hubs provide 100 mA or 500 mA depending upon the manufac...

Page 34: ...tion outputs are automatically configured based on the sensor thermistor or RTD selected Environmental Table 5 17 Environmental specifications Operating temperature range 0 to 70 C Storage temperature...

Page 35: ...current excitation source CJC sensor CJC sensor 11 I2 CH2 CH3 current excitation source 37 I3 CH4 CH5 current excitation return 12 NC 38 GND 13 C2H CH2 sensor input 39 C5L CH5 sensor input 14 C2L CH2...

Page 36: ...Measurement Computing Corporation 16 Commerce Boulevard Middleboro Massachusetts 02346 508 946 5100 Fax 508 946 9500 E mail info mccdaq com www mccdaq com...