Frequency
Markers
The CW generator provides up to 20 independent,
pre-settable markers, F0-F9 and M0-M9, that can
be used in the step sweep frequency mode for pre-
cise frequency identification. Marker frequency accu-
racy is the same as sweep frequency accuracy. The
markers are visible on a CRT display.
The 680XXB generates video markers that produce
a pulse on a CRT display at each marker frequency.
The video marker is either a +5V or a –5V pulse at
the rear panel
AUX I/O
connector. Pulse polarity is
selectable from a system configuration menu.
To output markers during a sweep you must first se-
lect (tag) the marker frequencies from the Marker
List menu, then turn on the marker output.
To go to the Marker List menu from a step sweep
frequency menu, press
FREQUENCY
CONTROL
The Step Sweep Frequency Control menu (below) is
displayed.
To go to the Marker List menu from this menu,
press
Marker List
. The Marker List menu, shown
on the next page, is displayed. This menu lets you
tag or edit marker list frequencies and turn the
markers on/off.
LOCAL (FRONT
SWEEP FREQUENCY
PANEL) OPERATION
OPERATION
3-32
680XXB OM
Summary of Contents for 680 B Series
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