4-40 Service Guide E8364-90038
Troubleshooting PNA Series Microwave Network Analyzers
Measurement System Troubleshooting E8362C, E8363C, E8364C
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 7-44.
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 7-50.
Option 014 . . . . . . . . . . . . . replace the appropriate test port coupler. Refer to “Removing and Replacing
the A25 and A26 Test Port Couplers” on page 7-50.
Option UNL . . . . . . . . . . . . reconnect the semirigid cable and go to “Checking the A36 and A37 60-dB
Step Attenuators (Option UNL)” on page 4-40.
Option UNL/014. . . . . . . . reconnect the semirigid cable and go to “Checking the A36 and A37 60-dB
Step Attenuators (Option UNL)” on page 4-40.
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 7-58.
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 4-40.
Checking the A38 and A39 Bias Tees (Option UNL)
1. Locate the following semirigid cable at the appropriate bias tee:
Options UNL and UNL/014. . . . . . . . . . . . . . . . . . W55 for Port 1 or W56 for Port 2
2. Using a 5/16-inch torque wrench, disconnect the semirigid cable at the bias tee.
3. Connect the spectrum analyzer to the step attenuator connector. Set the spectrum analyzer to measure a
signal at 1 GHz.
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