![background image](http://html.mh-extra.com/html/national-instruments/pxie-5654/pxie-5654_calibration-procedure_708715016.webp)
4.
Configure the PXIe-5654 using the following settings:
•
Frequency: Frequency from the list in step 3
•
Power Level: 0 dBm
•
Reference Clock Source: Onboard Clock
5.
Commit the settings to hardware if this is the first iteration of running this procedure;
otherwise skip to step 8.
6.
Initiate signal generation.
7.
Enable the RF output.
8.
Check the signal generation status and verify that there are no reported errors or
warnings.
9.
Configure the signal source analyzer using the following settings:
•
Center frequency: Frequency from the list in step 3
•
Reference level: 20 dBm
•
Frequency span: 1 MHz
•
Reference Clock source: External
•
Frequency counter resolution: 0.1 Hz
•
Sweep: Manual
•
Number of sweeps: 1
•
Auto Sweep Time
10. Measure the frequency of the peak that is returned by the signal source analyzer at
approximately the corresponding point in the frequency list you created in step 3.
11. Calculate the deviation using the following formula:
Δf =
fMeasured MHz − fExpected MHz
fExpected MHz
ppm
12. Ensure that the deviation found in the previous step is less than the result of the following
equation:
As Left Calculation:
Initial Accuracy
+
Temperature Stability
As Found Calculation:
Initial Accuracy
+
Aging
+
Temperature Stability
where
Initial Accuracy
= ±0.1 ppm
Temperature Stability
(15 °C to 35 °C) = ±0.2 ppm
Ten year aging = 1.25 ppm
13. Repeat steps 4 through 12 for the remaining frequencies in the list created in step 3.
14. Close the device session.
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PXIe-5654 Calibration Procedure