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NI PXIe-5653 Calibration Procedure
As-Found and As-Left Limits
The as-found limits are the published specifications for the NI 5653, found in the
NI PXIe-5665
Specifications
document. NI uses these limits to determine whether the NI 5653 meets the device
specifications when it is received for calibration.
The as-left limits are equal to the published NI specifications for the NI 5653, less guard bands
for measurement uncertainty, temperature drift, and drift over time. NI uses these limits to
determine whether the NI 5653 meets the device specifications over its calibration interval.
Verification
The performance verification procedures assume that adequate traceable uncertainties are
available for the calibration references.
Verifying 10 MHz Reference Frequency Accuracy
This verification ensures that the internal oven-controlled crystal oscillator (OCXO) is adjusted
for correct frequency accuracy. Complete the following procedure to determine the as-found
status of the NI 5653.
1.
Connect the NI 5653 REF OUT 10 MHz front panel connector to the signal source analyzer
RF IN front panel connector.
2.
Connect the signal source analyzer REF IN rear panel connector to the rubidium frequency
reference output connector.
3.
Create a new device session for the NI 5653.
4.
Set the RF frequency to 4 GHz and commit the settings to hardware.
5.
Check the signal generation status and verify that there are no reported errors or warnings.
6.
Configure the signal source analyzer as follows:
•
Center frequency: 110 MHz
•
Reference level: -50 dBm
•
Frequency span: 1 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.
