BNC 1201 - 6 1/2 Digit Digital Multimeter - Manual (Page 72)

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In 1201, user can specify the trigger source to be one of these three
options: front panel operations, external hardware trigger source and
remote interface operations.
Front Panel Operation
Use the front panel buttons - AUTO TRIGGER for auto triggering and
SINGLE for single triggering.
External Hardware
User applies a trigger pulse to the Ext TRIG (BNC) terminal on the rear
panel. External hardware triggering is like using single trigger but the
trigger source is an external hardware. When the multimeter receives a
pulse from the trigger source, it takes one reading, or a specified number
of readings. To set the external hardware trigger, press both the SHIFT +
SINGLE buttons to enable external hardware trigger. The lit “EXT”
annunciator on the display indicates the enabling of the external
hardware trigger.
Remote Interface Operation (By software or internal trigger)
By software trigger: The software trigger is similar to the single
triggering, but instead of using the “SINGLE” button on the front panel,
you send a command from your PC to the multimeter to generate an
event. For using software trigger, use the following command from your
PC terminal to set trigger source:
TRIGger:SOURce BUS
By internal trigger: The internal trigger is the default trigger mode for
the Remote Interface Operation. In the internal trigger mode, a trigger
signal will be issued whenever the multimeter is in the wait-for-trigger
state. To set the internal trigger, use the following command from your
PC terminal:
TRIGger:SOURce IMMediate
4.2.3 Trigger Setting
In 1201, user can specify a variety of trigger settings including the