Technical data

Service Guide N5230-90025 4-29
PNA Series Microwave Network Analyzers Troubleshooting
N5230C Measurement System Troubleshooting
All Traces
• 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 4-30.
• If the trace faults are band-related, the problem is in the source group. Using Table 4-4 on page 4-33,
note the frequency bands in which problems are seen. Go to “Source Group Tests” on page 4-30 and
perform the band-specific tests that correspond to the bands in which the problems are seen.
R Trace Only
A problem that affects only the R trace is isolated to the A20 mixer brick or the A5 SPAM board. For
analyzers with Options 146 or 246, the problem is additionally isolated to the A29 reference channel switch
and accompanying limiter and DC block. Go to “Checking the Receiver Group” on page 4-42.
A Trace Only
If the trace is missing in all bands, go to “Checking the Signal Separation Group” on page 4-38.
B Trace Only
If the trace is missing in all bands, go to “Checking the Signal Separation Group” on page 4-38.
C Trace Only
If the trace is missing in all bands, go to “Checking the Signal Separation Group” on page 4-38.
D Trace Only
If the trace is missing in all bands, go to “Checking the Signal Separation Group” on page 4-38.
A, B, and R1 Traces Only (Options 146 and 246)
The problem is in the source (1) group, go to “Checking the Source Group” on page 4-30. If the trace is missing in
all bands, go to “Checking the Signal Separation Group” on page 4-38.
C, D, and R3 Traces Only (Options 146 and 246)
The problem is in the source 2 group, go to “Checking the Source Group” on page 4-30. If the trace is missing in
all bands, go to “Checking the Signal Separation Group” on page 4-38.