3152B User Manual
Publication No. 980935 Rev. A
3-8
Operation
EADS North America Test and Services
Re-Triggered Run
Mode
Re-triggered mode is a special case of Triggered mode where, after
a valid trigger event, the generator automatically self-issues triggers
separated by a programmable delay. The delay interval is
measured from the end point of the waveform to the start point of
the next waveform cycle. Use the following commands to place the
instrument in re-triggered mode and to program the delay between
events:
init:cont off
Turns Continuous mode off, changing to
an interrupted mode. If you have not
selected a specific interrupted run mode
since power-up, the generator will
automatically be placed in Triggered
mode.
trig:retr 1
Turns on Re-triggered mode.
trig:retr:del <value>
Sets the re-trigger delay time. The re-
trigger delay is measured from the last
point of the waveform cycle to the first
point of the next waveform cycle.
<trigger event>
Starts the re-trigger generator. You may
select the source of trigger events from a
number of inputs, such as software trigger,
front-panel input, or VXIbus backplane
trigger lines.
The waveform will continue to re-trigger unless you change the run
mode or turn off power. Use the following commands to restore
continuous run mode:
trig:retr 0
This turns off Re-triggered mode. The
generator will revert to the Triggered run
mode.
init:cont on
This
removes the 3152B from interrupted
run mode and reverts to Continuous
mode.
Gated Run Mode
In Gated mode, the output remains at a specific DC level until a
valid event opens the gate. Only triggers from hardware sources
can open and close the gate. Use VXIbus backplane trigger lines or
the front-panel trigger input as the gating control.
You may set the edge sensitivity of the trigger signal for either the
rising or falling edge of the signal. At the end of the last output
cycle, the output assumes a DC level equal to the amplitude of the
last point of the waveform.
There are two selectable conditions for opening the gate:
•
Two transitions in the same direction toggle the gate on and
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