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SCXI-1503 Calibration Procedure

10

ni.com

9.

Configure the calibrator to output a DC voltage. Table 2 shows the test point values.

10. Create an AI voltage channel with an input range of ±10 V for one channel on the SCXI-1503.

11. Configure the SCXI-1503 input channel for a finite acquisition with a sample rate of 1000 Hz and 

1000 samples per channel.

12. Use DAQmx properties to set a gain of 1.

13. Use DAQmx properties to read the DAQ device scaling coefficients. E Series have two scaling 

coefficients while M Series and X Series have four scaling coefficients. Record the first two scaling 
coefficients and save the values as 

b

0

 and 

b

1

.

14. Start the task to set the channel MUX to the specified channel.

15. Use the saved device scaling coefficients from the DAQ device, 

a

0

 and 

a

1

 from step 7, and the 

combined DAQ device and SCXI-1503 module, 

b

0

 and 

b

1

 from step 13, to compute the device 

scaling coefficients for just the SCXI-1503, 

c

0

 and 

c

1

.

16. Configure the DMM to measure voltage at the CB-50 outputs and take a measurement.

Table 2.  

Test Point and Limit

SCXI-1503 Gain

Test Point Level (V)

Lower Limit (V)

Upper Limit (V)

1

9

8.991680513

9.008319487

6

5.993900513

6.006099487

3

2.996120513

3.003879487

0

-0.001659487

0.001659487

-3

-3.003879487

-2.996120513

-6

-6.006099487

-5.993900513

-9

-9.008319487

-8.991680513

100

0.09

0.089898305

0.090101695

0.06

0.059920505

0.060079495

0.03

0.029942705

0.030057295

0

-0.0000350949

0.0000350949

-0.03

-0.030057295

-0.029942705

-0.06

-0.060079495

-0.059920505

-0.09

-0.090101695

-0.089898305

c

0

b

0

b

1

a

1

-----

–

a

0

=

c

1

b

1

a

1

-----

=

Содержание Module SCXI-1503

Страница 1: ...og Input 8 Verifying the Excitation Current 11 Adjustment 11 Adjusting the Analog Input 12 Adjusting the Excitation Current 14 Where to Go for Support 15 Software Requirements Calibrating the SCXI 1503 requires installing NI DAQmx 8 1 or later on the calibration system You can download NI DAQmx from ni com downloads NI DAQmx 8 1 or later supports self calibration and external calibration in the La...

Страница 2: ...or the SCXI 1503 SCXI 1306 Terminal Block Installation Guide includes detailed information and published specifications for the SCXI 1306 NI DAQmx Help includes information about creating applications that use NI DAQmx NI DAQmx C Reference Help includes information about the functions in the driver You can find the latest versions of the documentation at ni com manuals Calibration Interval Nationa...

Страница 3: ...ange calibrate the module at that temperature Keep relative humidity below 80 Table 1 Recommended Equipment Equipment Recommended Model Parameter Measured Minimum Requirements Calibrator Fluke 5500A Analog Input If this instrument is unavailable use a calibrator that is accurate to 10 ppm 5 digits DMM PXI 4071 Excitation Current Analog Input If this instrument is unavailable use a multiranging 7 d...

Страница 4: ...ial Setup Install the module and configure it in Measurement Automation Explorer MAX 2 Self Calibration Adjust the self calibration constants of the module 3 Verification Verify the existing operation of the module This step confirms whether the module is operating within the published specifications prior to adjustment 4 Adjustment Adjust the calibration constants of the module The adjustment pro...

Страница 5: ...3 SCXI 1000 Chassis 4 SCXI 1349 Adapter 5 SH68 68 EP Cable for E Series DAQ Device SHC68 68 EPM Cable for M or X Series DAQ Device 6 Test Computer with NI PCI e DAQ Device 7 DMM 8 Calibrator 9 Calibrator to SCXI 1306 Wiring 10 CB 50 to DMM Wiring 11 CB 50 Terminal Accessory 12 NB1 Ribbon Cable 10 0000208 V 10 0000001 V DC DCV ACV OHM DCI ACI FRE Q Loca l Auto Cal Auto Zero Trig Rec all Stat e NPL ...

Страница 6: ...DAQ device refer to Figure 2 to make your connections 1 SCXI 1306 Terminal Block 2 SCXI 1503 Module 3 SCXI 1000 Chassis 4 SCXI 1349 Adapter 5 SHC68 68 EPM Cable 6 PXI Chassis 7 DMM 8 Calibrator 9 Calibrator to SCXI 1306 Wiring 10 CB 50 to DMM Wiring 11 CB 50 Terminal Accessory 12 NB1 Ribbon Cable 10 0000208 V 10 0000001 V DC DCV ACV OHM DCI ACI FRE Q Loca l Auto Cal Auto Zero Trig Rec all Stat e N...

Страница 7: ...1000 chassis 1 Configuration Switches shown in Off position 2 Switch Legends 3 Ground Lug 1 2 1 1 2 1 ON Closed IEX AI IEX AI Ch X IEX AI AI IEX IEX AI AI IEX CH 0 CH 1 CH 2 CH 3 CH 4 CH 5 CH 6 CH 7 CH 9 CH 8 CH 11 CH 10 CH 13 CH 12 CH 15 CH 14 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 CH 4 CH 5 CH 6 CH 7 CH 0 CH 1 CH 2 CH 3 CH 12 CH 13 CH 14 CH 15 CH 8 CH 9 CH 10 CH 11 ON ON SW 1 SW 2 ON ON SW 3 SW 4 1 1 2...

Страница 8: ...ning the module you want to calibrate 6 Select the module that you want to calibrate 7 Initialize a self calibration of the module you want to calibrate Verification This section provides instructions for verifying the following SCXI 1503 specifications Analog input Excitation current Note Limits in Table 2 are based on the March 2007 edition of the SCXI 1503 User Manual which includes the specifi...

Страница 9: ...Q device E Series have two scaling coefficients while M Series and X Series have four scaling coefficients Record the first two scaling coefficients and save the values as a0 and a1 Note The DAQ device scaling coefficients a0 and a1 are the same for each channel on the SCXI module since the DAQ device multiplexes all SCXI channels to channel ai0 on the DAQ device 8 Clear the task 1 To DMM V 2 To D...

Страница 10: ...channel MUX to the specified channel 15 Use the saved device scaling coefficients from the DAQ device a0 and a1 from step 7 and the combined DAQ device and SCXI 1503 module b0 and b1 from step 13 to compute the device scaling coefficients for just the SCXI 1503 c0 and c1 16 Configure the DMM to measure voltage at the CB 50 outputs and take a measurement Table 2 Test Point and Limit SCXI 1503 Gain ...

Страница 11: ... 15 nA or better at 100 A Note The PXI 4071 can measure up to 105 A in the 100 A range 3 Create an AI voltage channel and configure it to use internal excitation by setting the AI Excit Src to internal and then read the excitation current value from the AI Excit Val property node Save this value to DUT IEX 4 Configure the DMM to get current measurement results Save this value to DMM Reading 5 Calc...

Страница 12: ... connector 5 Connect the DMM V to pin 3 and DMM V to pin 4 of the CB 50 terminal accessorys Refer to Figure 5 for pin locations Figure 5 CB 50 Terminal Accessory Wiring Diagram for Connection to DMM Note When MAX configures a module it is assigned a module name Each function call uses this module name to determine the correct module to adjust This document uses Dev1 when referring to the module na...

Страница 13: ... at the CB 50 outputs and take a measurement Table 3 DC Source SCXI 1503 Gain Test Voltage 1 9 1 V 6 1 V 3 1 V 0 V 3 1 V 6 1 V 9 1 V 100 0 091 V 0 061 V 0 031 V 0 V 0 031 V 0 061 V 0 091 V LabVIEW Block Diagram NI DAQmx Function Call Call DAQmxInitExtCal with the following parameters deviceName Dev1 password NI or SCXI default calHandle calHandle LabVIEW Block Diagram NI DAQmx Function Call Call D...

Страница 14: ... in the off position as shown in Figure 3 2 Configure the DMM to do a current measurement with a range of 100 A and an accuracy of 15 nA or better at 100 A Note The PXI 4071 can measure up to 105 A in the 100 A range 3 Take a current measurement using the DMM Save this value to DMM Reading 4 Use the DAQmx Initialize External Calibration VI to create a calibration task LabVIEW Block Diagram NI DAQm...

Страница 15: ...to commit the constant overwritten 7 Repeat steps 1 through 6 for all of the other channels 8 Once you have completed adjusting the SCXI 1503 reverify the module Where to Go for Support The National Instruments Web site is your complete resource for technical support At ni com support you have access to everything from troubleshooting and application development self help resources to email and ph...

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