NI PXI-5663 Calibration Procedure
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© National Instruments
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7
3.
Connect power sensor B to the other output of the power splitter. Figure 1 shows the
completed equipment setup.
Figure 1.
RF Input Calibration (Without Attenuator) Equipment Setup
4.
Measure the channel A and channel B power (using the appropriate frequency for the
power sensor) for all frequencies between 10 MHz and 7 GHz with the RF source power
set to 0 dBm.
Note
Use the log frequency progression: 10, 20, 30, ..., 100, 200, 300, ...,
1,000 MHz, and so on.
5.
Calculate the RF input calibration factor (dB) for each frequency using the following equation:
RF Input Calibration Factor
=
Channel B Power
-
Channel A Power
RF Input Calibration (with Attenuator)
Use the results of the
RF Input Calibration (with Attenuator)
procedure in the absolute accuracy
test.
1.
Connect the power splitter input to the RF source output through the 3.5 mm-to-3.5 mm cable.
2.
Connect power sensor A to the previously designated reference output of the power splitter.
1
RF Source
2
Power Splitter
3
Power Sensor A
4
Power Meter
5
Power Meter Channel A
6
Power Meter Channel B
7
Power Sensor B
1
3
4
7
2
5
6