HP 34401A, User Manual

Page: 74 / 236

Trigger Source Choices
You must specify the source from which the multimeter will accept a
trigger. From the front panel, the multimeter will accept a single
trigger, a hardware trigger from the
Ext Trig terminal, or continuously
take readings using auto trigger. At power-on, auto triggering is used.
From the remote interface, the multimeter will accept a software (bus)
trigger, a hardware trigger from the
Ext Trig terminal, or an immediate
internal trigger. The * (sample) annunciator turns on during each
measurement.
•
The trigger source is stored in volatile memory; the source is set to
auto trigger (front panel) or immediate (remote interface) when
power has been off or after a remote interface reset.
•
To select the trigger source from the remote interface, use the
following command. The
CONFigure
and
MEASure?
commands
automatically set the trigger source to
IMMediate
.
TRIGger:SOURce {BUS|IMMediate|EXTernal}
Auto Triggering In the auto trigger mode (front panel only), the
multimeter 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 multimeter by pressing
Single
.
The multimeter takes one reading, or the specified number of
readings (sample count), each time you press the key. The
Trig
annunciator turns on when the multimeter is waiting for a trigger.
The front-panel
Single
key is disabled when in remote.
3
Chapter 3 Features and Functions
Triggering
73