NI PXIe-5653 Calibration Procedure
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© National Instruments
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10. Ensure that the recorded measurements are within the limits set in Table 7.
Adjustment
Completing the adjustment procedure automatically updates the calibration date and
temperature stored in the NI 5653 EEPROM. The calibration date also updates when you call
the niRFSG Initialize External Calibration and the niRFSG Close External Calibration VIs.
Adjusting Reference Accuracy
Complete the following procedure to adjust the NI 5653 frequency accuracy performance using
a signal source analyzer. This adjustment yields a more accurately tuned VCO frequency.
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.
Configure the signal source analyzer as follows:
•
Center frequency: 10 MHz
•
Reference level: 10 dBm
•
Frequency span: 600 Hz
•
Reference clock source: External
4.
Create a new external calibration session using the appropriate password.
Note
The default password for password-protected operations is
NI
.
5.
Create a new Reference Clock calibration session.
Table 7.
LO3 Phase Noise Density (dBc/Hz)
Offset
LO3
100 Hz
<-104
1 kHz
<-135
10 kHz
<-148
100 kHz
<-149
1 MHz
<-158
5 MHz
<-160
