HP 1660CS-Series User Manual page 174

The Analyzer Trigger Menu
Arming Control field
trigger sequence level for the arm term, the analyzer begins evaluating the
rest of that sequence level. However, if the arm term is not part of the
current sequence level, the preceding sequencing could trigger the analyzer
before the arm term is seen. Generally, the arm term is evaluated and used
the same as the other resource terms within the sequence instruction.
Skew
Skew allows you to enter a time offset for either the oscilloscope or analyzer,
to adjust the display. For correlation, the oscilloscope trigger mode must be
set to Immediate.
Selecting Skew gives you pop-up menus for Analyzer and Scope. The two
fields act jointly. For example, the effect of entering -8 ns in the Analyzer
field is the same as entering 8 ns in the Scope field.
Cross-armed measurements
By using the Group Run option you can time-correlate the measurements
between the oscilloscope and a timing analyzer and display data from either
machine on one display.
The oscilloscope trigger must be in Immediate mode when armed by the
analyzer to cause correlation of both modes waveforms.
If you set the oscilloscope to Run in the Arming menu, the oscilloscope will
be in the free-run mode and the waveform display will not be synchronized
with the other measurements in your system.
Arming control using external BNCs
The External BNCs on the rear panel provide more complex arming. In the
Arming Control menu, the External Triggers are called "Port In" and "Port
Out". The Arm In fields provide the selection for "PORT IN", and the Analyzer
Arm Out Sent From/Port Out fileds configure the "PORT OUT". The Port In
can arm either or both the oscilloscope and the analyzers, while the Port Out
can come from only a single instrument at a time.
One possible scenario is to have several test instruments, a logic analyzer,
and the oscilloscope connected to a complex target system. The analyzer is
armed by an external Arm In signal from another test/measurement entity.
After the first analyzer triggers, it arms the second analyzer. After the second
analyzer triggers, it arms the oscilloscope and sends a Port Out signal
through the external BNC. This signal is used to arm another external
test/measurement entity. Note that when Port Out specifies Analyzer and
7-55