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Performance Tests
Gain Compression
Gain Compression
Specifications (at 25 °C 5 °C)
In a 50 system
Description
This test identifies the frequency of greatest compression at a signal level of 0.3 V peak (
then uses a power meter to precisely measure the compression at that frequency.
Procedure
1. Select an attenuator to use: its nominal value must be in the 10 to 20 dB range.
2. Plug the power sensor into the power meter and turn on the power meter. Allow them to warm up for
3 minutes.
3. Calibrate and zero the power meter and the power sensor.
4. Preset the analyzer using the
5. Set up the analyzer to measure transmission (S21) over the 300 kHz to 3 GHz range.
6. Set the power level on the analyzer to 0 dBm.
7. Connect the probe adapter to the output of the analyzer.
8. Connect the output of the probe to the input port of the analyzer. Plug the probe tip into the adapter.
Connect the probe power cable to a power source.
9. Perform a response calibration on the analyzer using the probe as the "through cable." The trace on
the analyzer should now be a flat line at 0 dB.
10. Insert the attenuator between the output port of the analyzer and the probe adapter. Reconnect the
probe to the probe adapter.
11. Determine the frequency of peak gain on the trace of the analyzer. Record the frequency on the test
record.
12. Set the analyzer to CW mode for power meter measurements. Set the CW frequency to the value
determined in the previous step.
13. Remove the attenuator from the output port of the analyzer.
14. Connect the power sensor to the output port of the analyzer. Adjust the analyzer power output level to
produce a reading of 0.0 dBm on the power meter. (Note: 0.0 dBm is used to allow for possible
inaccuracy of power meters).
15. Disconnect the power sensor from the output port of the analyzer. Connect the attenuator to the
output port of the analyzer.
5-6
.0 dB at 0.3 V Peak
V Peak 0.458 dBm
hardkey.
PRESET
0.458 dBm). It
Chapter 5
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