National Instruments NI PXI-5422 Benutzerhandbuch

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

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

9,999,955 Hz

10,000,045 Hz

9,999,750 Hz

10,000,250 Hz