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CALIBRATION PROCEDURE

SCXI -1141/1142/1143

This document contains the information and instructions needed to 
calibrate the SCXI-1141/1142/1143 using Traditional NI-DAQ (Legacy).

Calibrate the SCXI-1141/1142/1143 at a regular interval as defined by the 
measurement accuracy requirements of your application. NI recommends 
performing a complete calibration at least once every year. Based on your 
measurement accuracy needs, you can shorten this interval to 90 days or
six months.

Conventions

The following conventions apply to this document:

»

The 

»

 symbol leads you through nested menu items and dialog box options 

to a final action. The sequence 

File»Page Setup»Options

 directs you to 

pull down the 

File

 menu, select the 

Page Setup

 item, and select 

Options

 

from the last dialog box.

This icon denotes a tip, which alerts you to advisory information.

This icon denotes a note, which alerts you to important information.

When this symbol is marked on a product, refer to the 

Read Me First: Safety 

and Radio-Frequency Interference 

for information about precautions to 

take.

When symbol is marked on a product, it denotes a warning advising you to 
take precautions to avoid electrical shock.

When symbol is marked on a product, it denotes a component that may be 
hot. Touching this component may result in bodily injury.

bold

Bold text denotes items that you must select or click in the software, such 
as menu items and dialog box options. Bold text also denotes parameter 
names.

Summary of Contents for SCXI-1141

Page 1: ...e sequence File Page Setup Options directs you to pull down the File menu select the Page Setup item and select Options from the last dialog box This icon denotes a tip which alerts you to advisory in...

Page 2: ...acy which includes high level function calls to simplify the task of writing software to calibrate devices Traditional NI DAQ Legacy supports many programming languages including LabVIEW LabWindows CV...

Page 3: ...install Traditional NI DAQ Legacy After adding these help files you can access them by selecting Start Programs National Instruments NI DAQ Online DAQ Support The documents provide instructions about...

Page 4: ...calling the appropriate calibration functions The steps used in the calibration procedure are as follows 1 Setting up the SCXI 1141 1142 1143 for testing 2 Verifying the existing operation of the SCXI...

Page 5: ...w well the SCXI 1141 1142 1143 is meeting its specifications You can use this information to select the appropriate calibration interval for your application 1 SCXI 1304 Terminal Block 2 SCXI 1141 114...

Page 6: ...d by MAX calOp ND_SELF_CALIBRATE setOfCalConst ND_USER_EEPROM_AREA calRefVolts 0 0 5 Call MIO_Config to enable dithering on the E Series DAQ device measurements Set the following parameters DAQdeviceN...

Page 7: ...arameters SCXIChassisID The device number assigned by MAX moduleSlot 1 channel 0 SCXIgain The gain you are testing TBgain 1 DAQboard The device number for the DAQ device DAQChannel 0 DAQgain 1 numPoin...

Page 8: ...g input channel 0 Refer to Table 7 to determine which pins on the 96 pin front connector correspond to the positive and negative inputs of the specified channel If you are using an SCXI 1304 connected...

Page 9: ...et the calibrator output to a 1 Vrms sine wave at the frequency specified in Tables 4 5 or 6 2 Verify that the DMM output is within the bounds specified by Tables 4 5 or 6 3 Repeat steps 1 and 2 until...

Page 10: ...he SCXI 1141 1142 1143 4 Call SCXI_Single_Chan_Setup to configure the module for single channel measurements Set the following parameters SCXIchassisID The value obtained from MAX moduleSlot 1 moduleC...

Page 11: ...for later use 10 Set the calibrator to the negative test point value for the same gain Skip any input limits that are specified as 0 0 V You need only upper and lower limits for adjustment 11 Read th...

Page 12: ...slot channel The channel you want to adjust opCode 2 calibrationArea 0 rangeCode 0 not used for the SCXI 1141 1142 1143 SCXIgain The gain setting you want to adjust DAQboard The device number assigned...

Page 13: ...the sine wave must be lower than 1 50th of the cutoff frequency For this procedure in sections SCXI 1141 1142 1143 Before Revision F or SCXI 1141 1142 1143 Revision F or Later you will set the filters...

Page 14: ...E Series DAQ device is connected to the SCXI 1141 1142 1143 7 Call SCXI_Set_Gain to configure the module to a gain value of 1 Set the following parameters SCXIchassisID The device number assigned by M...

Page 15: ...channel 0 is pin 4 which is AI 0 11 Set the calibrator voltage to 3 4 Vrms 400 Hz 12 Measure and record the amplitude of the sine wave with the DMM 13 Call SCXI_Configure_Filter to disable the filter...

Page 16: ...nputs of the specified channel If you are using an SCXI 1304 that is connected to the SCXI 1141 1142 1143 connect the calibrator to the AI 0 and AI 0 inputs 6 Connect the DMM to the output of channel...

Page 17: ...MAX moduleSlot 4 channel 0 value The new value decided upon in step 12 14 Repeat steps 11 through 13 until the measured amplitude is as close as possible to the level it was with the filter in bypass...

Page 18: ...3 NC AI 3 23 NC NC NC 22 A GND NC A GND 21 NC NC NC 20 AI 4 NC AI 4 19 NC NC NC 18 AI 5 NC AI 5 17 NC NC NC 16 A GND NC A GND 15 NC NC NC 14 AI 6 NC AI 6 13 NC NC NC 12 AI 7 NC AI 7 11 NC NC NC 10 NC...

Page 19: ...GND AI 3 9 10 A GND AI 4 11 12 A GND AI 5 13 14 A GND AI 6 15 16 A GND AI 7 17 18 A GND NC 19 20 NC NC 21 22 NC NC 23 24 DIG GND SER DAT IN 25 26 SER DAT OUT DAQ D A 27 28 NC SLOT 0 SEL 29 30 NC NC 31...

Page 20: ...41 1142 1143 If the module has been calibrated within the last year the Test Point V value should fall between the Upper Limit V and Lower Limit V values Table 9 SCXI 1141 1142 1143 Specifications Tes...

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