NI PXIe-5624R Calibration Procedure
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© National Instruments
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11
2.
Configure the signal generator using the following settings:
•
Frequency: 11 MHz
•
Power level: 0 dBm
3.
Configure the NI 5624R to acquire and measure the signal generated in step 2, using the
following settings:
•
Digitizer mode
•
Dither: Off
•
Samples: 1 × 10
6
•
Reference Clock source: Onboard
4.
Measure the frequency of the peak acquired tone using
Extract Single Tone
Information.vi
.
5.
Calculate the deviation using the following equation:
6.
Compare the value determined in step 5 to the verification test limits in the following table.
where
initial accuracy
= ±200 × 10
–9
aging
=
×
number of years since last adjustment
temperature stability
= ±2 × 10
–6
Note
You can find
number of years since last adjustment
programmatically using
NI LabVIEW Instrument Design Libraries for IF Digitizers.
Table 2.
Internal Frequency Reference Verification Limits
As-Found Limit
initial ac aging + temperature stability
As-Left Limit
initial accuracy
f
Δ
f
measured
11
MHz
–
11
MHz
-----------------------------------------------
=
0.5
±
x
10
6
–
year
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