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NI PXIe-5693 Calibration Procedure
Note
For frequencies >700 MHz, use the high frequency power combiner in place
of the low frequency power combiner.
Characterizing the Spectrum Analyzer (with Cable and
10 dB Attenuator)
1.
Connect one end of the 10 dB attenuator to the RF source 1 output and the other end to the
RF input of the spectrum analyzer using the SMA (m)-to-SMA (m) cable.
2.
Connect the RF source 1 10 MHz REF OUT connector to the spectrum analyzer REF IN
connector using the BNC (m)-to-BNC (m) cable. Figure 5 shows the completed equipment
setup.
Figure 5.
Spectrum Analyzer (with Cable and 10 dB Attenuator) Characterization
Equipment Setup
3.
Configure the spectrum analyzer according to the following settings:
•
Reference level: 0 dBm
•
Span: 3 kHz
•
Resolution bandwidth: 1 kHz
•
External reference source: EXT
4.
Set the RF source 1 frequency to 4.6 GHz
5.
Set the RF source 1 power to 0 dBm.
6.
Set the spectrum analyzer center frequency according to step 4.
7.
Measure the peak amplitude using the spectrum analyzer.
8.
Calculate the cable and 10 dB attenuator loss using the following equation:
Cable and 10 dB Attenuator Loss
=
RF Source 1 Power (Direct)
B
-
Spectrum Analyzer Reading
9.
Repeat steps 3 through 8 for all frequencies between 4.6 GHz and 7.2 GHz, in 200 MHz
steps.
1
RF Source 1
2
10 dB Attenuator
3
SMA (m)-to-SMA (m) Cable
4
Spectrum Analyzer
5
BNC (m)-to-BNC (m) Cable
1
4
3
5
2
