Service Guide N5227-90001 4-29
PNA Series Microwave Network Analyzers Troubleshooting
N5227A 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. Press UTILITY , then , then . In the Address box, click the
down arrow and then click My
Computer. In an open area of the My Computer window, click the right
mouse button and then click
Properties in the resulting pop-up menu.
Click the Hardware tab, click Device Manager, and then expand
Network Adapters in the resulting
list. The following entry should be listed: Keysight Technologies DSP Driver #2
and should be
enabled.
2. If the entry is not present or if the icon to the left of the name is a yellow box containing an
exclamation mark (!), navigate the following directories and 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 traces exhibit power drops in some frequency bands, the problem is in the source group. Go to
“Source Group Tests” on page 4-30 and perform the tests that correspond to the problems seen.
Single Trace (A, B, C, D, R1, R2, R3, or R4) Only
If the trace is missing in all bands or has notches or roll-off, go to “Checking the Signal Separation Group” on
page 4-36.
A, B, R1, and R2 Traces Only
The problem is in the source 1 group, go to “Checking the Source Group” on page 4-30.
C, D, R3, and R4 Traces Only
The problem is in the source 2 group, go to “Checking the Source Group” on page 4-30.
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