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National Instruments Corporation
25
NI PXIe-5611 Calibration Procedure
2.
Connect the PXI Express chassis 10 MHz REF IN rear panel connector
to the spectrum analyzer 10 MHz REF OUT rear panel connector.
3.
Connect one available port of the power splitter to the power meter.
4.
Connect one available port of the power splitter to the 6 dB attenuator.
5.
Connect one available port of the 6 dB attenuator to the spectrum
analyzer RF INPUT front panel connector.
Note
For best results, do not use any cables between the NI 5611, power splitter, and
power sensor. Connect these devices directly together.
6.
Call the niRFSG Initialize External Calibration VI.
7.
Call the niRFSG 5611 Initialize RF Gain Calibration VI.
8.
Call the niRFSG 5611 Configure RF Gain Calibration VI, and set the
Instrument Transition Threshold (dBm)
parameter to the power
level equal to the bottom of the power meter’s accurate range.
Note
The default behavior of the niRFSG 5611 Configure RF Gain Calibration VI is to
calibrate all filters. If you choose to calibrate a single filter, repeat the entire RF path
calibration procedure on each of the eight filters to complete a full calibration.
9.
Configure the spectrum analyzer using the following spectrum
analyzer parameter settings:
•
Center frequency: value specified by the
Frequency to Measure
(Hz)
parameter of the niRFSG 5611 Configure RF Gain
Calibration VI
•
Reference level: value specified by the
Spectrum Analyzer
Reference Level (dB)
parameter of the niRFSG 5611 Configure
Impairment Calibration VI
•
Frequency span: 0 Hz
•
Resolution bandwidth: 500 Hz
•
Sweep time: 20 ms
•
Attenuation: 5 dB
•
Preamplifier: On
10. Using the instrument(s) specified by the
Measurement Instrument
parameter of the niRFSG 5611 Configure Impairment Calibration VI,
measure the mean power of the generated tone at the frequency
specified by the
Frequency to Measure (Hz)
parameter of the
niRFSG 5611 Configure RF Gain Calibration VI.