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NI 5450 Calibration Procedure
32
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12. Measure the exact frequency of the peak around 11 MHz using the
Extract Single Tone Information VI with the following inputs.
•
advanced search»approx freq.
:
–1
•
advanced search»search
:
5
•
export signals
:
0
(none)
13. Calculate the error in timing as parts per million (ppm) using the
following formula:
error
= (
a
– 11,000,000) / 11
where
a
= the measured frequency
14. Calculate the
Calibration Test Limits
as parts per million (ppm) using
the following formula:
where
TempDelta
°C = |
Device Temperature
°C –
Last external cal temperature
°C |
Compare the result to the Calibration
Test Limits
or the
Published
Specifications
listed in Table 11. If the result is within the selected test
limit, the device has passed this portion of the verification.
LabVIEW Block Diagram
C/C++ Function Call
Perform an FFT on the array of data from
step 11.
CalibrationTestLimits ppm
(
)
30
TempDelta
3
°
C
<
,
7
TempDelta
3
–
(
)
30
TempDelta
3
°
C
≥
,
+
×
=