4-28 Service Guide N5230-90024
Troubleshooting PNA Series Microwave Network Analyzers
Measurement System Troubleshooting N5230C
• If all traces are missing in all bands, the problem is most likely in the source group. However, a missing
or disabled DSP driver may exhibit the same or similar symptoms. To verify that this DSP driver is present
and enabled:
1. Click My Computer,
Properties, Hardware tab, Device Manager. Expand Agilent PNA DSP Device. The
following entry should be listed:
Agilent Technologies DSP Driver #2 and should be enabled.
2. If the icon to the left of the name is a yellow box containing an exclamation mark (!), use Windows
Explorer to verify the presence of the following file: C:\WINNT\system32\drivers\spampnp.sys.
3. If you have verified that the DSP driver is present and enabled, but all traces are still missing in all
bands, go to “Checking the Source Group” on page 4-29.
• If the trace faults are band-related, the problem is in the source group. Using Table 4-4 on page 4-32,
note the frequency bands in which problems are seen. Go to “Source Group Tests” on page 4-29 and
perform the band-specific tests that correspond to the bands in which the problems are seen.
R1 Trace Only
A problem that affects only the R1 trace is isolated to the A20 mixer brick or the A5 SPAM board. Go to
“Checking the Receiver Group” on page 4-40.
R2 Trace Only
A problem that affects only the R2 trace is isolated to the A20 mixer brick or the A5 SPAM board. Go to
“Checking the Receiver Group” on page 4-40.
A Trace Only
If the trace is missing in all bands, go to “Checking the Signal Separation Group” on page 4-36.
B Trace Only
If the trace is missing in all bands, go to “Checking the Signal Separation Group” on page 4-36.
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