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NI PXIe-5653 Calibration Procedure
6.
Configure the signal source analyzer as follows:
•
Center frequency: 100 MHz
•
Reference level: 10 dBm
•
Frequency span: 250 kHz
•
Reference clock source: External
•
Frequency counter mode: 0.1 Hz resolution
7.
Use the signal source analyzer frequency counter to measure the frequency of the peak at
approximately 110 MHz.
8.
Calculate the deviation using the following formula:
9.
Ensure that the result in step 8 is less than the result of the following formula:
Initial Accuracy
+
Aging
+
Temperature Stability
Where:
Initial Accuracy
=
Aging
=
Temperature Stability
=
10. Close the device session.
Verifying 100 MHz Reference Amplitude Accuracy
This verification ensures that the 100 MHz reference circuitry is adjusted for correct amplitude
accuracy. Complete the following procedure to determine the as-found status of the NI 5653.
1.
Connect the NI 5653 REF OUT 100 MHz front panel connector to the power meter.
2.
Create a new device session for the NI 5653.
3.
Set the RF frequency to 4 GHz and commit the settings to hardware.
4.
Check the signal generation status and verify that there are no reported errors or warnings.
5.
After correcting for the measurement frequency, use the power meter to measure the
NI 5653 REF OUT 100 MHz front panel connector power. Ensure that the power is
between 1 dBm and 10 dBm.
6.
Close the device session.
Δ
f
f
measured
MHz
(
)
100
MHz
–
100
MHz
-------------------------------------------------------------------
=
50 10
9
–
×
100 10
9
–
×
Year
--------------------------
NumberofYearsSinceLastAdjustment
×
10 10
9
–
×