Pause on test point fail is not selected for this test.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.
Prior to running this test, certain settings must be set to avoid error messages and possible test failure:
This setting must be set to ON. To verify the setting, follow the steps below:
If it was necessary to change the setting, return the PNA to its previous state after the test is completed.
This setting must be set to OFF. To verify the setting, follow the steps below:
If it was necessary to change the setting, return the PNA to its previous state after the test is completed.
Make sure that the PNA Power Limit setting is set to OFF. Although the default state for this setting is OFF, some customers may have changed this setting. To verify that the setting is in the OFF state, on the PNA go to Power > Power and Attenuators > Offsets and Limits. From the drop-down, select OFF for all ports. Verify that the state for all ports shows as OFF.
Be sure that Pause on test point fail is not selected for this 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.
Power meters with firmware version A.02.03 or A.01.03 may not operate properly with the new test software. Upgrade the power meter firmware if necessary.
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, make sure the connections are good. Unexpected attenuation in cable or connections may cause a problem. If the 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.
