Dynamic Accuracy Test - Version 1 - Keysight Technologies N5247B Service Manual

Tests and Adjustments
Performance Tests
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 – Version 1
This description applies to all E836xA/B/C and N5230A/C instruments. It also
applies to N5241A/42A/44A/45A instruments with serial numbers less than
xx5240xxxx. For all other instruments, see test version 2.
Function of the Test: To measure the relative power linearity of the analyzer's
receivers.
Specification Tested: Test Port Input–Dynamic Accuracy
Equipment Used:
— Z5623A Option H01 dynamic accuracy test set
— 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. The analyzer's source port is connected to the dynamic accuracy test set's
source port and the analyzer's receiving port is connected to the dynamic
accuracy test set's receiver port. A power sensor is connected to the
dynamic accuracy test set's power meter port.
Within the dynamic accuracy test set, the source signal is routed through
a small amplifier and a 10 dB step attenuator, A1, to a power splitter. One
side of the power splitter is connected to the power sensor port. The
signal from the other side of the splitter is routed through a 110 dB step
attenuator, A2, to the receiver port.
3. With the amplifier active and A1, set to 0 dB, the analyzer source power is
adjusted to achieve exactly 0.0 dBm at the power sensor. This is the power
meter reference reading, Pmr.
3-40
for instructions on replacing the suspected
Keysight N5247B Service Guide
Chapter 7, "Repair