Features and Functions 3
Keysight 34420A User’s Guide 95
Trigger Source Choices
You must specify the source from which the meter will accept a trigger.
– The trigger source is stored in volatile memory; the source is set to autotrigger
(front panel) or immediate (remote interface) when power has been off or after
a remote interface reset.
– Front Panel operation: the meter will accept a either a front panel single
trigger or a hardware trigger from the Ext Trig terminal, or continuously take
readings using autotrigger. At power-on, autotriggering is used.
– Remote operation: the meter will accept a software (bus) trigger, a hardware
trigger from the Ext Trig terminal, or an immediate internal trigger. See
“Triggering” on page 93 for more information.
Autotriggering In the autotrigger mode (front panel only), the meter
continuously takes readings at the fastest rate possible for the present
configuration. This is the power-on trigger source for front-panel operation.
Single Triggering In the single trigger mode (front panel only), you can
manually trigger the meter by pressing . The meter takes one reading, or
the specified number of readings (sample count), each time you press the key. The
‘Trig’ annunciator turns on when the meter is waiting for a trigger.
Pressing the key also allows the meter to accept triggers on the Ext Trig
terminal.
The front-panel key is disabled when in remote.
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