Service Guide E8361-90001 4-31
PNA Series Microwave Network Analyzers Troubleshooting
E8361A Measurement System Troubleshooting
• If all traces are present and are similar to the traces in Figure 4-9, then there are no
major problems with the analyzer’s measurement system. There may, however, be a
minor failure in the analyzer.
To test further:
—Go to Chapter 3, “Tests and Adjustments” and perform all the tests in that section.
— If a problem still exists, contact Agilent. Refer to “Contacting Agilent” on page 2-10.
• If any of the traces are not present, are noisy or distorted, or are at an incorrect level,
then there is a problem with the analyzer’s measurement system. Proceed to “Where to
Begin Troubleshooting.”
Where to Begin Troubleshooting
For the purposes of troubleshooting, the analyzer block diagram is divided into the
following functional groups:
• the source group
— A8 fractional-N synthesizer
— A10 frequency reference
— A11 phase lock
— A12 source 20
— A16 test set motherboard
— A17 LOMA 12
—A18 MA 24
— A19 splitter
— A20 LODA
— A21 SOMA 50
— A23, A24 SOMA 70
• the signal separation group
—A22 switch
— A25 and A26 test port couplers
— Port 1, Port 2, A, B, R1, and R2 ports
• the receiver group
— A27, A28, A29, and A30 first converters
— A31 receiver A
— A32 receiver R1
— A33 receiver R2
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