The Trigger Source
The trigger source parameter specifies the signal which triggers the
multimeter. The trigger source is set with the following command:
TRIGger:SOURce
source
The source settings are:
BUS
= trigger source is the HP-IB group execute trigger (
GET
) or the
system
*TRG
command. Within the HP 75000 Series B mainframe, the
instrument whose trigger source is set to BUS and was the last instrument
addressed to listen will respond to the HP-IB group execute trigger. The
system trigger (
*TRG
) is sent to a specific instrument
(i.e.
OUTPUT 70903;"*TRG"
).
EXT
= trigger source is an external trigger applied to the multimeter’s
"External Trigger" BNC connector. The multimeter triggers on the
falling (negative-going) edge of a TTL signal.
When scanning with a FET multiplexer "switchbox" (multiplexers at a
different secondary HP-IB address),
TRIGger:SOURce EXT
must be
selected in order to trigger the multimeter with the Channel
Closed/External Trigger line on the digital bus.
HOLD
= suspends triggering. Once set, the multimeter can only be
triggered with the
TRIGger[:IMMediate]
command.
IMMediate
= an internal trigger signal is always present. Placing the
multimeter in the wait-for-trigger state (
INIT
) causes it to be triggered.
MEASure
and
CONFigure
set
TRIGger:SOURce IMM
. (
MEASure
also
executes
INIT
.)
TTLTrg0 - TTLTrg7
= trigger source is VXIbus TTL trigger line 0 through 7.
These trigger sources are available with the HP E1411B multimeter only.
Querying the Trigger
Source
The trigger source is queried with the
TRIGger:SOURce?
command. See
Chapter 5 for additional information.
Chapter 4
Understanding the HP E1326B/E1411B Multimeter 103
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