BNC 645 - Manual (Page 72)

72
5
System Operations
5.1 Triggering
This feature is only available for bursts and sweeps. There are three
options to choose from: internal triggering, external triggering and
manual triggering. The default is the internal triggering in which the
waveform generator continuously outputs the selected waveform.
The Ext Trig connector on the rear panel is used to receive the external
trigger signal. The waveform generator outputs a burst or a sweep each
time the Ext Trig connector receives a TTL pulse. One may instruct the
waveform generator to trigger on the ascending edge or the descending
edge of the external trigger signal.
In manual triggering, the waveform generator outputs a burst or a sweep
each time the Trigger button on the front panel is pressed. The Trigger
button is lit when the waveform generator is waiting for the next trigger
event. Triggering is disabled when functions other than burst or sweep is
chosen.
How to choose a trigger source
1. Press the Trig Setup softkey after burst or sweep is activated.
2. Press the Src softkey and then select among Int (internal), Ext
(external) and Man (manual). After your selection is made, the
trigger setting will be shown on the display.
3. Press the DONE softkey to finish the setting.
Note that the trigger source setting is stored in volatile memory. The
default setting will be restored after the power is cycled.
Remote interface operation
TRIGger:SOURce {IMMediate|EXTernal|BUS}
How to specify the trigger slope with external trigger source
1. After choosing Ext as your trigger source, press the softkey under