76 34410A/11A User’s Guide
2 Features and Functions
External Triggering
External triggering takes one reading (or the specified number of readings)
each time the multimeter receives a pulse on the rear–panel (coaxial) Ext
Trig terminal. You may select whether the multimeter uses the rising edge
(POS) or falling edge (NEG) of the applied external trigger signal to trigger a
reading (see “Trigger Slope” on page 77). The diagram below shows the
Ext Trig terminal and NEG timing:
• The multimeter buffers one external trigger. If the multimeter is
currently taking a reading while another trigger occurs, that second
trigger is accepted. After the reading in progress is completed, the
stored trigger is issued.
• The Trig annunciator turns on when the multimeter is waiting for an
external trigger.
• The rear panel VM Comp (voltmeter complete) terminal provides a pulse
after completion of each measurement. Voltmeter complete and external
trigger implement a standard hardware handshake sequence between
measurement and switching devices. The diagram below shows the VM
Comp terminal and NEG timing:
• Front Panel Operation: The external trigger mode corresponds in function
to pressing the key from the front panel, except that you apply
the trigger signal to the Ext Trig terminal.
• Remote Interface Operation: The following command selects the trigger
source from the external terminal:
TRIGger:SOURce EXTernal
Refer to the Agilent 34410A/34411A Programmer’s Reference for
complete description and syntax for this command.
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