Keysight N5221A/22A Service Guide 4-33
Troubleshooting
Measurement System Troubleshooting
Click the Hardware tab, click Device Manager, and then expand
Keysight PNA DSP Device 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 4-34.
— If the traces exhibit power drops in some frequency bands, the problem is
in the source group. Go to “Source Group Tests” on page 4-34 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 4-39.
A, B, R1, and R2 Traces Only
The problem is in the source 1 group, go to “Checking the Source Group” on
page 4-34.
C, D, R3, and R4 Traces Only
The problem is in the source 2 group, go to “Checking the Source Group” on
page 4-34.
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