NI 5421, Calibration Procedure

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NI 5421/5441 Calibration Procedure | © National Instruments | 9
Verifying the Oscillator Frequency Accuracy
This test verifies the frequency accuracy of the oscillator on the NI 5421/5441. Verification
involves generating a 10 MHz sine wave with the NI 5421/5441 and measuring the sine wave
frequency with one of the instruments from Table 2.
To verify the frequency accuracy of the oscillator on the NI 5421/5441, complete the following
steps:
1.
Connect the NI 5421/5441 CH 0 front panel connector to the instrument measuring the
frequency accuracy with a male BNC-to-female SMB cable.
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_ConfigureSampleRate
(niFgen Set Sample Rate VI) using the following
parameters:
•
vi : The session handle returned from
niFgen_init
• Sample Rate : 100 MS/s (
100000000
)
4. Call
niFgen_SetAttributeViReal64
to set the gain (NI-FGEN Gain property) using
the following parameters:
•
vi : The session handle returned from
niFgen_init
• channelName :
"0"
• attributeID :
NIFGEN_ATTR_ARB_GAIN
• value :
1
Note You can adjust the gain value based on which measuring device you use.
5. Call
niFgen_SetAttributeViReal64
to set the offset (NI-FGEN Offset property)
using the following parameters:
•
vi : The session handle returned from
niFgen_init
• channelName :
"0"
• attributeID :
NIFGEN_ATTR_ARB_OFFSET
• value :
0
Note
You can adjust the offset value based on which measuring device you use.