Trace Noise Test; System Compression Test - Agilent Technologies PNA Series Service Manual

Tests and Adjustments
Performance Tests (Agilent N2721A Software Package)

Trace Noise Test

Function of the Test: To measure the stability of a signal in the internal source and
receiver system of your analyzer.
Specification Tested: Test Port Input–Trace Noise Magnitude and Trace Noise Phase
Equipment Used: A test cable.
Description of the Test:
1. Port 1 and Port 2 are connected with a test cable.
2. The analyzer is set to a series of CW frequencies across its frequency range.
3. Magnitude and phase are measured at each frequency at both 1 kHz and 10 kHz IF
bandwidths, in both directions.
4. All measurements are made at a nominal power level of 0 dBm and with 201 points per
sweep.
If the Analyzer Fails this Test:
• Repeat this test. It is unlikely for the analyzer to fail this test without a complete
failure of the network analyzer system.
• If the analyzer still fails this test, perform the
page 3-44 and repeat this test.

System Compression Test

Function of the Test: To measure the compression at the analyzer's specified maximum
power level for the receivers.
Specification Tested: Test Port Input–Maximum Test Port Input Level
Equipment Used: Shorts from calibration kit and 10-dB attenuators.
Description of the Test:
1. All measurements are made with a 1 kHz IF bandwidth and 201 points per sweep.
2. The analyzer is set to various CW frequencies across the range of the analyzer.
3. Two measurement windows are open (set to measure: A and B).
4. Shorts with 10 dB fixed attenuators are connected to the test ports.
5. A power sweep is performed over the full ALC range and saved to memory.
6. The 10 dB attenuators are removed and the shorts are reconnected to the test ports.
7. A power sweep is performed and data is normalized with memory.
8. Receiver compression is the difference between the displayed power value at the low
end of the ALC range and the power value at the high end of the ALC range. This
compression is compared with the specifications.
3-30
PNA Series Microwave Network Analyzers
"Receiver Calibration Adjustment" on
Service Guide E8361-90001
E8361A