3 Features and Functions
96 Keysight 34420A User’s Guide
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 110.
– 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
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 key is disabled when in remote.
– Remote operation: Use the following command to enable external trigger.
TRIGger:SOURce EXTernal
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