External Triggering In the external trigger mode, the meter will
accept a hardware trigger applied to the Ext Trig terminal. The meter
takes one reading, or the specified number of readings (sample count),
each time Ext Trig receives a low-true pulse.
See also “External Trigger Terminal,” on page 97.
• The meter buffers one external trigger. This means that if the meter is
taking a reading and another external trigger occurs, that trigger is
accepted (a “Trigger ignored” error is not reported). After the reading
in progress is complete, the stored trigger satisfies the trigger source
and then the trigger is issued.
• Front-panel operation: The external trigger mode is like the single
trigger mode except that you apply the trigger to the Ext Trig
terminal. Pressing
Single to enable the single trigger mode also
enables the external trigger mode. The
‘Trig’ annunciator turns on
when the meter is waiting for an external trigger.
The front-panel
Single key is disabled when in remote.
• Remote operation: Use the following command to enable external
trigger.
TRIGger:SOURce EXTernal
3
Chapter 3 Features and Functions
Triggering
83
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