Keysight N5221A Service Manual page 107

PNA Series Microwave Network Analyzers
N5221A/22A
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 System
down arrow and then click My Computer
mouse button and then click
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
• 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
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
page 4-34.
A, B, R1, and R2 Traces Only
The problem is in the source 1 group, go to
C, D, R3, and R4 Traces Only
The problem is in the source 2 group, go to
Service Guide N5222-90001
Configure
, then , then
. In an open area of the My Computer window, click the right
Properties in the resulting pop-up menu.
and perform the tests that correspond to the problems seen.
"Checking the Source Group" on page
"Checking the Source Group" on page
Measurement System Troubleshooting
Control Panel...
. In the Address box, click the
4-30.
"Checking the Signal Separation Group" on
4-30.
4-30.
Troubleshooting
4-29