Selecting a
Sweep
Trigger
The 681XXA provides sweep triggering for analog
frequency sweep, step frequency sweep, and CW
power sweep. The sweep generator has three modes
of sweep triggering, each selectable from the trigger
menu. The following is a description of each mode.
Auto (Automatic)–The sweep continually
sweeps from its start frequency (power level)
to its stop frequency (power level) with optimal
retrace time.
External
–The sweep recurs when triggered by
an external TTL-compatible clock pulse to the
rear panel
AUX I/O
connector.
Single
–A single sweep starts when the trigger
key is pressed. If a sweep is in progress when
the key is pressed, it aborts and resets.
To go to the Analog Sweep Trigger menu (shown be-
low) from the Analog Sweep Ramp menu, press
Trigger Menu
.
To select a sweep trigger mode, press its menu soft-
key. A message showing the sweep trigger mode se-
lected appears on the right side of frequency title
bar . When you are finished, press
Previous Menu
to return to the Analog Sweep Ramp menu.
If you select the single sweep trigger mode, the
menu display adds the menu soft-key
Trig
. Press-
ing
Trig
starts a single sweep. If a single sweep is
in progress, pressing
Trig
causes the sweep to abort
and reset.
LOCAL (FRONT
SWEEP FREQUENCY
PANEL) OPERATION
OPERATION
3-24
681XXA OM
