Dynamic Accuracy Test - Keysight N5224B Series Service Manual

Tests and Adjustments
Performance Tests
4. A calibration is performed between the end of the test cable and Port 1.
The Port 1directivity and source match and the S12 load match are
retrieved from the analyzer.
5. On some older analyzer models, the reflection tracking and transmission
tracking error terms were also specified. For those models, these error
terms are also retrieved from the analyzer.
6. This process is repeated for Ports 3 and 4 on 4-port analyzers.
If the Analyzer Fails this Test:
— Failure of the directivity error term is often due to a faulty test port coupler.
Replace the coupler and repeat this test.
— Failure of the source or load match error terms is due to faulty hardware
between the test port and the internal source. Refer to
and Replacement Procedures."
faulty component or assembly.

Dynamic Accuracy Test

This description applies to all N522xb, N5231B/32B/34B/35B/39B, and
N5247B instruments.
Function of the Test: To measure the relative power linearity of the analyzer's
receivers.
Specification Tested: Test Port Input–Dynamic Accuracy
Equipment Used:
— U3020AD01 dynamic accuracy test set
— Signal generator
— Power meter
— Power sensor
— Two test cables
Description of the Test:
1. The analyzer's test ports are tested separately at a specific CW frequency
and a reference power level of -20 dBm.
2. A test cable is connected between the analyzer's source port and the
dynamic accuracy test set's Source 1 In port. A test cable is connected
between the signal generator and the test set's Source 2 In port. A test
cable is connected to the test set's Receiver Out port, and the power
sensor is connected to the end of this cable.
The test set's output attenuator is set to 20 dB. With the signal generator
RF turned off, the PNA source power is adjusted until the power sensor
reads -20 dBm. The PNA source is then turned off, the signal generator RF
is turned on, and the signal generator power is adjusted until the power
sensor reads -20 dBm.
Keysight N5224B/25B Service Guide
for instructions on replacing the suspected
Chapter 7, "Repair
3-39