4-50 Service Guide E8364-90026
Troubleshooting PNA Series Microwave Network Analyzers
Measurement System Troubleshooting E8362B, E8363B, E8364B
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 A22 Switch Splitter and A25 and A26 Test Port Couplers
1. Locate the following semirigid cable at the A22 switch splitter:
Standard . . . . . . . . . . . . . . . . . . . . . . . . W5 for Port 1 or W6 for Port 2
Option UNL . . . . . . . . . . . . . . . . . . . . . . W51 for Port 1 or W52 for Port 2
Option 014 . . . . . . . . . . . . . . . . . . . . . . . W61 for Port 1 or W62 for Port 2
Option UNL/014 . . . . . . . . . . . . . . . . . . W51 for Port 1 or W52 for Port 2
2. Using a 5/16-inch torque wrench, disconnect the semirigid cable at the A22 switch
splitter.
3. Connect the spectrum analyzer to the connector. Set the spectrum analyzer to measure
a signal at 1GHz.
4. If the 1 GHz signal is not present, replace the A22 switch splitter. Refer to “Removing
and Replacing the A22 Switch Splitter” on page 7-42.
5. If the 1 GHz signal is present:
Standard . . . . . . . . . replace the appropriate test port coupler. Refer to “Removing and
Replacing the A25 and A26 Test Port Couplers” on page 7-48.
Option 014 . . . . . . . . replace the appropriate test port coupler. Refer to “Removing and
Replacing the A25 and A26 Test Port Couplers” on page 7-48.
Option UNL . . . . . . . reconnect the semirigid cable and go to “Checking the A36 and
A37 60-dB Step Attenuators (Option UNL)” on page 4-50.
Option UNL/014 . . . reconnect the semirigid cable and go to “Checking the A36 and
A37 60-dB Step Attenuators (Option UNL)” on page 4-50.
Checking the A36 and A37 60-dB Step Attenuators (Option UNL)
1. Locate the following semirigid cable at the appropriate step attenuator:
Option UNL . . . . . . . . . . . . . . . . . . . . . . W53 for Port 1 or W54 for Port 2
Option UNL/014 . . . . . . . . . . . . . . . . . . W81 for Port 1 or W82 for Port 2
2. Using a 5/16-inch torque wrench, disconnect the semirigid cable at the step attenuator.
3. Connect the spectrum analyzer to the step attenuator connector. Set the spectrum
analyzer to measure a signal at 1 GHz.
4. If the 1 GHz signal is not present, replace the appropriate 60-dB step attenuator. Refer
to “Removing and Replacing the A36 and A37 60-dB Source Step Attenuators (Option
UNL)” on page 7-56.
5. If the 1 GHz signal is present, reconnect the semirigid cable and go to “Checking the
A38 and A39 Bias Tees (Option UNL)” on page 4-51.
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