Performance Tests And Adjustments; Performance Tests - Keysight N9923A Service Manual

Tests and Adjustments

Performance Tests and Adjustments

Performance Tests and Adjustments
The performance tests and adjustments listed below support the N9923A
analyzer. The Keysight N7841A TME software application supports these tests
and adjustments.
The Keysight N7841A TME software application executes on a PC under the
Keysight N7800A test executive. See "TME Downloads" on page 3-9 for
applicable web links.
The N7841A Help provides troubleshooting recommendations when a
performance test or adjustment fails.
A description of each of the performance tests and adjustments for the
N9923A follows.

Performance Tests

Frequency Accuracy
This test measures the accuracy of the internal time base by measuring the
frequency at Port 1. A 1.8 GHz low pass filter is used to attenuate harmonics
generated by the source in the UUT.
Error Terms
This test checks the quality of the CalReady calibration. It measures a short
connected to the port under test.
Note: The Error Terms adjustment should be performed every twelve months to
preserve calibration accuracy for CalReady.
System Dynamic Range
This test performs a two port isolation calibration which sets the reference
power to the power output level of each port (0 dB = the power output level at
the port). Loads are then connected to each port. The S21 and S12
measurements then represent the difference between the port output power
and the noise floor for a given measurement. Averaging is used to remove
random noise.
Receiver Compression
This test measures compression at +10 dBm over a range of frequencies.
Power deltas measured by the FieldFox A and B receivers are compared to
power deltas measured by a power meter. This measurement is relative to the
0 dBm reference.
Dynamic Accuracy
The Z5623A H01 test set is used to measure dynamic accuracy of the A and B
receivers down to -41 dBm. A reference power of -1 dBm is used for the test.
Keysight N9923A Service Guide 3-7