Keysight N5227A Service Manual page 107

PNA Series Microwave Network Analyzers
N5227A
Checking Port 1, 2, 3, or 4 Power Outputs (A, B, C, or D Signals)
The object of this check is to verify the power of the output signal across the entire frequency range.
Perform this test if there is an observed problem only with one receiver trace. The ten second sweep is slow
enough to allow you to observe the output power on the power meter as the sweep occurs.
1. Connect the power sensor to the suspect port.
2. Set the trace to measure S
3. Observe the power reading on the power meter as the sweep occurs on the analyzer.
4. The measured output power on the power meter should be at least the preset power level ±1 dB over the
entire frequency range.
• If the measured power is correct, go to
• If the measured power is not correct, go to
on page 4-37.
Checking the Signal through the Signal Separation Path
For all of the following checks, refer to the block diagrams at the end of this chapter and to any of the
following that are appropriate:
• "2-Port Configuration, Option 200" on page 6-20
• "Bottom RF Cables, Standard 2-Port Configuration, Option 200" on page 6-22
• "2-Port Configuration, Option 219" on page 6-38
• "Bottom RF Cables, Option 219" on page 6-40
• "4-Port Configuration, Option 400" on page 6-44
• "Bottom RF Cables, Standard 4-Port Configuration, Option 400" on page 6-46
• "4-Port Configuration, Option 419" on page 6-62
• "Bottom RF Cables, Option 419 (Ports 1 and 2)" on page 6-64
• "Bottom RF Cables, Option 419 (Ports 3 and 4)" on page 6-66
Trace loss in the signal separation group is due to one or more of the following assemblies being defective:
• A50, A51, A52, or A53 mechanical switch and A54 combiner (A54 is only available in 4-port models with
Option 423 and 2-port models with Option 224.)
• A29, A30, A31, or A32 receiver coupler
• A38, A39, A40, or A41 source step attenuator
• A42, A43, A44, or A45 bias tee
• A33, A34, A35, and A36 test port coupler
Service Guide N5227-90001
, S , S , or S , dependent on the suspect port.
11 22 33 44
"Checking the Receiver Group" on page
"Checking the Signal through the Signal Separation Path"
Troubleshooting
Measurement System Troubleshooting
4-40.
4-37