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ni.com
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PXIe-5673 Calibration Procedure
4.
Connect any available rubidium frequency reference rear panel BNC connector to the
spectrum analyzer REF IN rear panel connector through the BNC(m)-to-BNC(m) cable.
5.
Generate a single-sideband tone with a +1 MHz offset from the carrier signal with the
following niRFSG property settings:
•
Frequency (Hz): 85 MHz
•
Power Level (dBm): 0 dBm
•
Generation Mode: Arb Waveform
•
Reference Clock Source: ClkIn
The image appears at 84 MHz, and the carrier leakage appears at 85 MHz.
6.
Use the spectrum analyzer to measure the mean power of the RF output using the following
spectrum analyzer parameter settings:
•
Center frequency: (Frequency in step 5) + 1 MHz
•
Reference level: +5 dBm
•
Frequency span: 0 Hz
•
Resolution bandwidth: 500 Hz
•
Sweep time: 5 ms
•
Reference clock source: External
Note
Zero-span mode of the spectrum analyzer shortens test time by avoiding
unnecessary frequency sweeping. To obtain the average power, convert the zero-span
trace data to linear volts, perform a mean calculation, and then convert the linear volts
back to dBm.
7.
Use the spectrum analyzer to measure the mean power of the image using the following
spectrum analyzer parameter settings:
•
Center frequency: (Frequency in step 5) -1 MHz
•
Reference level: +5 dBm
•
Frequency span: 0 Hz
•
Resolution bandwidth: 500 Hz
•
Sweep time: 5 ms
•
Reference clock source: External
8.
Use the spectrum analyzer to measure the mean power of the carrier using the following
spectrum analyzer parameter settings:
•
Center frequency: Equivalent to the frequency in step 5
•
Reference level: +5 dBm
•
Frequency span: 0 Hz
•
Resolution bandwidth: 500 Hz
•
Sweep time: 5 ms
•
Reference clock source: External
