Harris 9250-05, Operator'S Manual

Page 1: ... 2000 HARRIS INSTRUMENT CORPORATION ALL RIGHTS RESERVED Model 9250 05 High Speed Resistance Tester Operators Manual ...

Page 2: ...es 9 Model 9250 05 Commands 10 Data Entry Conventions 10 Invalid Command Response 11 Averaging Setting 11 Baud Rate Setting 12 Resistance Calibration 12 Line SYNC Commands 13 Line SYNC ON 13 Line SYNC OFF 13 Limits Settings 13 Set UPPER Limit 13 Set LOWER Limit 13 Start Readings 13 HELP Screen 14 Set Resistance Range 14 Stop Readings 15 Auto Range Selection 15 Set Auto Range ON 15 Set Auto Range O...

Page 3: ...commands via RS 232 Calibration is software controlled Product Overview The Model 9250 05 performs a 4 digit 4 wire Kelvin based resistance measurement The use of a four terminal resistance measurement system eliminates the inaccuracies introduced by test lead resistance All functions of the Model 9250 05 are selected and data is returned by commands across the serial communications link The measu...

Page 4: ...05 The temperature range is 0 120ºC with an accuracy of 2ºC The temperature is available over the serial communications link Computer Interface The resistance ranges are selected and data returned by ASCII commands via the serial communications link to either a host computer or the LED Option Customer Interface The unit requires a RS 232 command to begin sending and to stop resistance readings The...

Page 5: ...erated from welding Manual Conventions Throughout this manual section there are many keyboard commands that will be used to signify command sequences Different fonts will be used for the keyboard commands The following table describes these commands and keystrokes Key Description Space Bar Enter Key Command Sequence Start Backspace Caps Lock Keystroke S Communications Software Response Mouse Actio...

Page 6: ...mum 250Watts Maximum Power connection is via a three prong HP style enclosed connector on the back panel of the unit The power line is filtered to suppress power line transient noise and power line induced RF interference Quick disconnect power line connections are made directly to the internal power line filter inside the enclosure The input power is fused with a 2Amp Slo Blo type 3AG fuse See Fi...

Page 7: ...250 05 for attachment of terminals RS 232 resistance inputs and logic inputs Terminal INPUT Connector The six pin MS Style female circular connector on the back panel of the unit is for the current and voltage terminals and the GO NO GO relay dry contact closure output A 4 wire Kelvin connection is required No internal snubbing is provided for the relays All voltages are compliance voltages Pin Te...

Page 8: ... to the Model 9250 05 are available via the 7 pin MS style female circular connector on the back panel Figure 7 These inputs are not currently defined and will be available by custom order in the first quarter of 1998 Pin Function A Input 1 B 5VDC C Input 4 D Input 3 E Input 2 F LOGIC COMMON G GROUND Table 5 7 pin Logic INPUT Circular Connector Pinouts Physical Dimensions The standard Model 9250 0...

Page 9: ...Remote display and keypad for entry of commands and control of the Model 9250 05 LCD Option LCD Touchscreen Customer Interface Remote touch screen for entry of commands and control of the Model 9250 05 available first quarter 1998 HR Option High Resistance Testing available first quarter 1998 LR Option Low Resistance Testing available first quarter 1998 Table 8 Options for Model 9250 05 Accessorie...

Page 10: ...ange 0 1 2 3 4 5 Stop Readings Stop sending resistance readings Set Auto Range Auto range mode set ON Set Auto Range Auto range mode set OFF Diagnostics Displays the raw counts from the analog to digital converter for calibration and troubleshooting Reset Sets all user selected variables to factory default Table 10 Command Sequence Listing Commands for Temperature Compensation TC IRTC Options can ...

Page 11: ...ing using the example formula XXXXXX number of readings factory default value is 60 readings on the next page The averaging value will affect the update rate as shown in Table 11 9600 baud Setting Update Rate 1 110Hz 100 83Hz 200 33Hz 500 15Hz 1000 8Hz 10000 0 8Hz Table 11 Update Rates with Averaging Settings Higher baud rate settings will increase the update rate Example 57600 baud with averages ...

Page 12: ... Model 9250 05 is performed by placing a calibration standard near the full scale resistance for each range across the meter inputs and transmitting a calibration command for the current selected range over the serial communications link Command C XXXXXX When the full scale reading is complete the unit will prompt the operator to insert a lower 10 of first standard resistance standard across the m...

Page 13: ...sistance 1 5000 and the high limit 1 4900 the GO relay will be open Example Set UPPER Limit to 20 500 Command E 20 500 Set LOWER Limit Enter the LOWER Limit in OHMS with the appropriate decimal point When resistance 1 0999 and the low limit 1 1000 the GO relay will be open Example Set LOWER Limit to 10 500 Command M 10 500 Start Readings The Start Readings command will initiate the sending of resi...

Page 14: ...de ON V Auto range mode OFF X Multiplexer command string X 1 2R4 4 9R1 3 7R2 Y_XX X Temperature calibration point Current Settings Range 2 ohm Averages 00060 Baud rate is now 9600 High Limit 1999 99 Low Limit 000 The line synchronization is ON Temp Compensation OFF Temperature Coefficient 00393 Reference Temperature 25 0 Set Resistance Range The resistance range may be changed by the Set Resistanc...

Page 15: ...utomatically switch to the next lower range Set Auto Range ON Turn on the automatic ranging feature Set Auto Range OFF Disables the automatic range selection The meter will remain on the last selected range until a new range command is issued Auto Range OFF is the factory default Diagnostic Output Displays the raw counts from the analog to digital converter Used in calibrating the system Restore F...

Page 16: ...tions can be set for a baud rates of underlined is factory default 9600bps 19200bps 38400bps 57600bps When setting up for operation with a personal computer PC be sure that no other serial devices are sharing the communications port on the PC The Model 9250 05 requires a standard communications port for operation For this manual the Windows TERMINAL program will be used as an example communication...

Page 17: ...tions Settings Communications Select under the CONNECTOR Scroll Box the proper communications port on the host computer that is connected to the Model 9250 05 Typically this w ill be COM2 as the mouse for Window s is typically on COM1 COM2 Select the 9600 Radio Button in the BAUD RATE area 9600 Select the 8 Radio Button in the DATA BITS area 8 Select the 1 Radio Button in the STOP BITS area 1 Sele...

Page 18: ...dings issue the Start Readings command or configure the unit with one of the other commands NOTE The Model 9250 05 is a precision resistance measurement instrument and requires a warm up period of approximately five minutes BEFORE readings should be taken Also verify that the RX and TX lamps on the front of the Model 9250 05 are illuminating when the unit is receiving commands RX or transmitting d...

Page 19: ...in six resistors or resistance standards The values of these standards for this example are 1 9K 10 190 10 19 10 1 9 10 0 19 10 and 0 019 10 Almost any standard or resistor can be used for the Calibration Procedure as long as they match the ranges of the meter and are 10 of the higher standard Calibration Example 1 Apply power to the Model 9250 05 WARM UP POWER UP The unit will respond with WARM U...

Page 20: ...0 3 000 If out of range then verify connections to the resistance tester and that the range is set correctly 9 Stop diagnostic readings Command S 10 Begin the Resistance Calibration command Command C 1900 0 The unit will now prompt you to connect a lower resistance standard 199 10 to the unit and then enter the value of the low resistance standard Command Please insert a low resistance standard 11...

Page 21: ...uto Range command has been re enabled 14 Enable Temperature Compensation if applicable Command I Temperature Compensation if applicable is now re enabled The Model 9250 05 is now calibrated and ready for use NOTE The standard resistors should be measured as accurately as possible usually one more digit of accuracy than the unit will display ...