Keysight N5221A Service Manual page 113

PNA Series Microwave Network Analyzers
N5221A/22A
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 4-35.
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 6-19
• "Bottom RF Cables, Standard 2-Port Configuration, Option 200" on page 6-21
• "Bottom Assemblies, 2-Port, Option 219" on page 6-43
• "Bottom RF Cables, 2-Port, Option 219" on page 6-45
• "Bottom Assemblies, Standard 4-Port Configuration, Option 400" on page 6-49
• "Bottom RF Cables, Standard 4-Port Configuration, Option 400" on page 6-51
• "Bottom Assemblies, 4-Port, Option 419" on page 6-76
• "Bottom RF Cables, 4-Port, Option 419 (Ports 1 and 2)" on page 6-78
• "Bottom RF Cables, 4-Port, Option 419 (Ports 3 and 4)" on page 6-81
Trace loss in the signal separation group is due to one or more of the following assemblies being defective:
• A25, A26, A27, or A28 receiver coupler
• A34, A35, A36, or A37 source step attenuator
• A38, A39, A40, or A41 bias tee
• A29, A30, A31, or A32 test port coupler
Equipment Used for These Tests
Equipment Type
Spectrum analyzer
a. Must be capable of measuring a signal at 1 GHz.
To determine which assembly is defective, check the signal at each available measurement point in the
Service Guide N5222-90001
, 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"
Model or 
Part Number
8565E
Measurement System Troubleshooting
4-38.
Alternate Model or Part
Number
a
856xE
Troubleshooting
4-35