National Instruments PXIe-4357 Скачать руководство пользователя страница 7

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7

Adjustment Procedure

Use the adjustment procedure to adjust the gain and offset calibration constants for each channel. 
At the end of each calibration procedure, these new constants are stored in the external 
calibration area of the EEPROM. These values are password-protected, which prevents the 
accidental access or modification of any calibration constants adjusted by the metrology 
laboratory. The default password is 

NI

. You can calibrate as many or as few channel and 

excitation configurations as desired. The calibration routine for the NI PXIe-4357 uses a 
two-point calibration to determine the gain and offset adjustment calibration constants.

Complete the following steps to test the accuracy of the module.
1.

Set the calibrator to standby mode (STBY).

2.

Make the following connections to the TB-4357 for the channel you want to adjust. Refer 
to Figure for visual reference. Refer to the 

Connecting the Calibrator to the Module

 

section for the pin assignments and signal names of the TB-4357.

Note

All connections shown in Figure 3 must be made using discrete connections.

Figure 3.  

Adjustment Connections

Table 4.  

4-Wire Mode Accuracy Test Limits

Test Point (

Ω

)

Lower Limit (

Ω

)

Upper Limit (

Ω

)

0

–0.034

0.034

50

49.946

50.054

100

99.926

100.074

150

149.906

150.094

200

199.886

200.114

250

249.866

250.134

300

299.846

300.154

350

349.826

350.174

400

399.806

400.194

C

a

li

b

r

a

tor

HI

AUX HI

AUX LO

LO

TB-4

3

57

CH X

EX+

AI+
AI–

EX–

Содержание PXIe-4357

Страница 1: ...cedure 7 Specifications 9 Where to Go for Support 10 Software Requirements Install NI DAQmx 9 5 or later on the calibration computer NI DAQmx includes high level function calls to simplify the task of...

Страница 2: ...use the NI DAQmx driver The NI DAQmx C Reference Help includes information about the functions in the driver Calibration Interval National Instruments recommends a calibration interval of one year fo...

Страница 3: ...mance of the NI PXIe 4357 The calibration process consists of the following steps 1 Initial Setup Install the module and configure it in Measurement Automation Explorer MAX 2 Verification Verify the e...

Страница 4: ...on describing the required module connections Each channel consists of a group of four pins specific to that channel Before connecting or disconnecting the calibrator from the module always set the ca...

Страница 5: ...the following connections to the TB 4357 for the channel you want to verify Refer to Figure 2 for visual reference Refer to the Connecting the Calibrator to the Module section for the pin assignments...

Страница 6: ...cation 15 Compare the measured result for each value to the Upper Limit and Lower Limit values in Table 4 If the results are all between these values the module passes the test 16 Set the calibrator t...

Страница 7: ...etermine the gain and offset adjustment calibration constants Complete the following steps to test the accuracy of the module 1 Set the calibrator to standby mode STBY 2 Make the following connections...

Страница 8: ...ration VI The default password is NI 8 Call the DAQmx Adjust 4357 Calibration VI 9 Set the calibrator to output a resistance of 350 This is the second calibration point 10 Call the DAQmx Adjust 4357 C...

Страница 9: ...module you must reverify the accuracy of the module To do this repeat the Verification section Specifications The specifications in Table 5 are provided for reference only refer to the NI PXIe 4357 S...

Страница 10: ...Information at ni com legal export compliance for the National Instruments global trade compliance policy and how to obtain relevant HTS codes ECCNs and other import export data Where to Go for Suppo...

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