HP 8712C User Manual page 367

Front/Rear Panel
Connectors
If limit testing is turned off on both measurement channels,
this connector also serves as a user-defined TTL input
and output that can be set and read from IBASIC or SCPI
(HP-IB). See Chapter 7, "Automating Measurements, n for
more information.
USER TI'L This rear panel female BNC connector can be used in three
IN/OUT different ways. Define its use by pressing
selection.
The default use for this connector provides a bidirectional
l
open-collector TTL signal which can be set or read from
which you can drive low, but must not drive high, since
the analyzer also drives it. See Chapter 7, "Automating
Measurements," for more information.
This connector can also be used with an external switch
l
to automate softkey presses. See "User-Dellned (BEGIN]
Key Menu" and "Using Fast Recall with a Switch" in
Chapter 7.
Lastly, this connector can be conhgured for use as a sweep
l
out connector. When configured this way, the output is
driven high during a sweep.
8-6
Pass Pass
Fail
Pass
Fail
High lpassl
( )
SYSTEM OPTIONS