Agilent Technologies PNA Series Service Manual page 130

Troubleshooting
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 within −15 dBm ±4 dB for all
E8361A PNAs, 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, No Options" on page 6-21
1. "Bottom RF Cables, No Options" on page 6-23
Port 1 trace loss in the signal separation group is due to one or more of the following
assemblies being defective:
• A22 switch
• A25 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:
• A22 switch
• A26 test port 2 coupler
Equipment Used for These Tests
Equipment Type
Spectrum analyzer
1. 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 signal path from the A22 switch to the test port coupler.
For Port 1 measurements, set the network analyzer for an S
frequency of 1 GHz.
For Port 2 measurements, set the network analyzer for an S
frequency of 1 GHz.
Perform the following checks in the order presented.
4-50
Model or Alternate Model
Part Number or Part Number
8565E
856xE
PNA Series Microwave Network Analyzers
1
measurement with a CW
11
measurement with a CW
22
Service Guide E8361-90001
E8361A