NI 5421/5441 Calibration Procedure
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National
Instruments
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Along with the standard NI-FGEN attributes, the external calibration session uses a set of
calibration constants that are determined during the calibration procedure and stored in the
device onboard memory when the session is closed. NI-FGEN uses these calibration constants
during a standard NI-FGEN session to ensure that the device operates within its specifications.
You must close an external calibration session by using
niFgen_CloseExtCal
(niFgen Close
Ext Cal VI), as shown in the following figure.
Figure 2.
NI 5421/5441 External Calibration Procedure
Adjusting the Analog Output
The analog output adjustment procedure has several subprocedures that adjust the following
parameters:
•
Main analog path preamplifier offset
•
Main analog path preamplifier gain
•
Main analog path postamplifier gain and offset
•
Direct analog path gain
Initialize Ext Cal
S
ession
Initialize Analog Output Calibration
Adjust Main Path Pre-Amp Offset
Adjust Main Path Pre-Amp Gain
Adjust Main Path Post-Amp
Gain and Offset
Adjust Direct Path Gain
Adjust Oscillator Frequency
Adjust Calibration ADC
Close Ext Cal
S
ession
Initialize Calibration
ADC Calibration
Initialize Oscillator
Frequency Calibration
