Power meters with firmware version A2.03.00 (or A1.03.00) may not operate properly with the new test software. Upgrade the power meter firmware if necessary.
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Power meters with firmware version A2.03.00 (or A1.03.00) may not operate properly with the new test software. Upgrade the power meter firmware if necessary. |
Review the General Troubleshooting recommendations before proceeding with this section. There are no adjustments specifically for the Receiver Compression Performance Test.
This troubleshooting procedure assumes the PNA successfully passes the Power Level Linearity (Source Power Linearity) Performance Test, the Maximum Leveled Power (Source Maximum Power) Performance Test, and the Power Level Accuracy (Source Power Accuracy) Performance Test.
Source unlevelled messages may appear on the PNA screen during this test. The messages do not necessarily indicate a problem with the operation of the test. The work-around is to change the RF/microwave cable or add a 3 dB pad.
It is not unusual to see a significant step in the compression test result at frequencies where the test power-level changes. Changes in the test power level are driven by the specification.
If this test fails, rerun the test. If the test continues to fail, perform the Receiver Calibration Adjustment. If the test still continues to fail, identify the two receivers involved in the ratioed measurement that fails. Consider swapping receivers within the PNA to attempt to isolate the receiver causing the failure (if the PNA hardware configuration supports swapping).
The Receiver Display utility provides simultaneous display of all receivers. It can be helpful in troubleshooting. It can be accessed via System > Service > Utilities.
If the test fails when using the Z5623A K01 or U3070A K01 test sets, make sure the connections are good. Unexpected attenuation in cable or connections may cause a problem. If a Z5623A K01 or U3070A K01 test set does not respond over GPIB, make sure the PRINTER/TEST SET switch on the rear panel is in the TEST SET position.
Refer to the appropriate PNA service guide for specific troubleshooting suggestions and replacement procedures.
Possible causes when a test aborts:
Source receiver is very noisy.
Source not capable of sufficient power above specified max power. Sometimes a test process may require an output power one or two dB above the specified max power. Check the Maximum Leveled Power (Source Maximum Power) test results.
