2.
a.
systems: press
[STEP]
on the HP85101 to set the source to step mode.
b. HP 8350B systems: press
[SWEEP TIME]
and use the entry keys to set the sweep time to
200
ms.
3. Press PARAMETER
[MENU] [USER 1 al]
to see the unratioed power trace.
For an
HP
the trace level should decrease from -20 5
at low frequency to -35 5
at high frequency.
4. Connect an open (or a short) to port 1.
5. Press
[USER
4
bl]
and check that the trace for each is within the limits described above.
6. Connect a thru between port 1 and port 2 (connect pad to port 1 and test port return cable between
pad and port 2).
For an
use a 20
system pad.
7. Press
[USER
2
and check that the trace is within the same limits.
8. If one or more channels appear faulty, refer to the procedure titled
User Channel Looks Bad
at
the end of this section.
NOTE:
For an HP 8514B, check the bl and b2 trace between 2
and 20
Below 2
the
coupler rolls off rapidly.
1. Press
[PRESET]
STIMULUS
[MENU]
on the HP85102 to preset the HP8510 and access the STIM-
ULUS menu.
a.
systems: press
[STEP]
on the HP85101 to put the source in step mode.
b.
systems: press
[SWEEP TIME]
and use the entry keys to set the sweep time to
200
ms.
2. To check all of the samplers in an S-parameter test set, first redefine the a2 and b2 phase lock and
drive paths:
Press PARAMETER
[MENU] [User 3
[REDEFINE PARAMETER] [DRIVE] [Port
[PHASELOCK]
[REDEFINE DONE]
to redefine a2.
Press
[User 2
[REDEFINE PARAMETER] [DRIVE] [Port [PHASELOCK]
[REDEFINE
DONE]
to redefine b2.
3. Connect an open (or short) to port 1 and port 2.
5-18 Test
Troubleshooting
HP
Test Sets