HP 34401A User Manual page 129

Chapter 4 Remote Interface Reference
Triggering
The Wait-for-Trigger State
After you have configured the multimeter and selected a trigger source,
you must place the multimeter in the wait-for-trigger state. A trigger
will not be accepted until the multimeter is in this state. If a trigger
signal is present, and if multimeter is in the "wait-for-trigger" state,
the measurement sequence begins and readings are taken.
The "wait-for-trigger" state is a term used primarily for remote interface
operation. From the front panel, the multimeter is always in the "wait-
for-trigger" state and will accept triggers at any time, unless a
measurement is already in progress.
You can place the multimeter in "wait-for-trigger" state by executing
any of the following commands from the remote interface.
MEASure?
READ?
INITiate
The multimeter requires approximately 20 ms of set-up time after you
send a command to change to the "wait-for-trigger" state. Any external
triggers that occur during this set-up time are ignored.
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