Gain Compression - Keysight 85024A User's And Service Manual

Gain Compression

Specifications (at 25 °C ±5 °C)
In a 50 W system
Description
This test identifies the frequency of greatest compression at a signal level of 0.3 V
peak (–0.458 dBm). It 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
2 Plug the power sensor into the power meter and turn on the power meter.
3 Calibrate and zero the power meter and the power sensor.
4 Preset the analyzer using the [PRESET] hardkey.
5 Set up the analyzer to measure transmission (S21) over the 300 kHz to 3 GHz
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
9 Perform a response calibration on the analyzer using the probe as the "through
10 Insert the attenuator between the output port of the analyzer and the probe
11 Determine the frequency of peak gain on the trace of the analyzer. Record the
12 Set the analyzer to CW mode for power meter measurements. Set the CW
13 Remove the attenuator from the output port of the analyzer.
Keysight 85024A User's and Service Guide
range.
Allow them to warm up for 3 minutes.
range.
probe tip into the adapter. Connect the probe power cable to a power source.
cable." The trace on the analyzer should now be a flat line at 0 dB.
adapter. Reconnect the probe to the probe adapter.
frequency on the test record.
frequency to the value determined in the previous step.
Performance Tests
<1.0 dB at 0.3 V Peak
0.3 V Peak = –0.458 dBm
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