National Instruments NI PXI-5422 Verifying the DC Gain and Offset Accuracy

NI PXI-5422 Calibration Procedure 18 ni.com

A frequency error of 45 Hz for a 10 MHz signal corresponds to an

error of 4.5 ppm. This limit accounts for the initial accuracy and the

frequency deviation caused by temperature and aging. Refer to Table 3

for frequency ranges.

11. Call niFgen_AbortGeneration (niFgen Abort Generation VI) to

abort the waveform generation using the following parameter:

•vi: The session handle returned from niFgen_init

12. Call niFgen_close (niFgen Close VI) to close the instrument

driver session, to destroy the instrument driver session and all of

its properties, and to release any memory resources NI-FGEN uses.

Use the following parameter:

•vi: The session handle returned from niFgen_init

Verifying the DC Gain and Offset Accuracy

This test verifies the DC gain and offset accuracy of the NI PXI-5422 into

a high-impedance load by generating a number of DC voltages and offsets,

measuring the voltage with a DMM, and comparing the NI PXI-5422 to the

error limits.

The DC gain and offset accuracy verification procedure has three

sub-procedures that verify the following:

• Main analog path gain

• Main analog path offset

• Direct path gain

To verify the gain of the NI PXI-5422 main analog path, complete the

following steps:

1. Connect the NI PXI-5422 CH 0 front panel connector to the DMM for

measuring DC gain and offset accuracy.

2. Call niFgen_init (niFgen Initialize VI) using the following

parameters:

•resourceName: The name of the device that you want to verify.

You can find this name under Devices and Interfaces in MAX.

Table 3. Frequency Ranges

Calibration Test Limit Published Specifications ±25 ppm

Low High Low High

9,999,955 Hz 10,000,045 Hz 9,999,750 Hz 10,000,250 Hz