Service Guide N5230-90024 4-37
PNA Series Microwave Network Analyzers Troubleshooting
N5230C Measurement System Troubleshooting
Checking Port 2 Power (B Signal)
The object of this check is to verify the power of the B signal across the entire frequency range. Perform this
test if there is an observed problem only with the channel B 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 Port 2.
2. Observe the power reading on the power meter as the sweep occurs on the analyzer.
3. The measured output power on the power meter should be approximately -5 dBm (for 20 GHz PNA), -10
dBm (for 40 GHz PNA), or -15 dBm (for 50 GHz PNA), over the entire frequency range.
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:
• “Bottom Assemblies, Option 220” on page 6-16
Port 1 trace loss in the signal separation group is due to one or more of the following assemblies being
defective:
• A17 MASS26.5 or A18 MA 26.5/A19 MASS 50
• A25 step attenuator
• A21 test port 1 coupler
Port 2 trace loss in the signal separation group is due to one or more of the following assemblies being
defective:
• A17 MASS26.5 or A18 MA 26.5/A19 MASS 50
• A26 step attenuator
• A22 test port 2 coupler
Equipment Used for These Tests
To determine which assembly is defective, check the signal at each available measurement point in the
signal path from the switch to the test port coupler.
For Port 1 measurements, set the network analyzer for an S
11
measurement with a CW frequency of 1 GHz.
For Port 2 measurements, set the network analyzer for an S
22
measurement with a CW frequency of 1 GHz.
Perform the following checks in the order presented.
Checking the A17 MASS 26.5 and the A21 and A22 Test Port Couplers
1. Locate the following semirigid cable at the appropriate output of the A17 MASS 26.5:
• W8 for Port 1 of analyzers without Option 1E1 (no source attenuators)
Equipment Type
Model or
Part Number
Alternate Model or Part
Number
Spectrum analyzer 8565E
856xE
a
a. Must be capable of measuring a signal at 1 GHz.
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