NI 5421/5441 Calibration Procedure
18
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Verifying the DC Gain and Offset Accuracy
This test verifies the DC gain and offset accuracy of the NI 5421/5441 into
a high-impedance load by generating a number of DC voltages and offsets,
measuring the voltage with a DMM, and comparing the NI 5421/5441 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
Verifying the Main Analog Path Gain
To verify the gain of the NI 5421/5441 main analog path, complete the
following steps:
1.
Connect the NI 5421/5441 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.
•
IDQuery
:
VI_TRUE
•
resetDevice
:
VI_TRUE
•
vi
: A pointer to a ViSession. The variable passed by reference
through this parameter receives the value that identifies the
session created by this function. This value acts as the session
handle and is passed as the first parameter to all subsequent
NI-FGEN functions.
3.
Call
niFgen_SetAttributeViBoolean
to set the analog filter state
(niFgen property node:
Output Attributes»Analog Filter Enabled
)
using the following parameters:
•
vi
: The session handle returned from
niFgen_init
•
channelName
:
"0"
•
attributeID
:
NIFGEN_ATTR_ANALOG_FILTER_ENABLED
•
value
:
VI_FALSE
