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48 HP E1312A/E1412A Multimeter Application Information Chapter 2
Bus Triggering The multimeter is triggered from the VXIbus. This mode is selected with the
TRIGger:SOURce BUS command.
• Use the *TRG command from the HP-IB to trigger the multimeter
when
TRIG:SOUR BUS is used. The *TRG command will not be
accepted unless the multimeter is in the wait-for-trigger state.
• You can also trigger the multimeter from the HP-IB interface by
sending the IEEE-488 Group Execute Trigger (GET) message. The
multimeter must be in the wait-for-trigger state. Send a GET from a
Hewlett-Packard controller with the following command:
TRIGGER 70903
Note TRIG:SOUR BUS is not implemented on B-size resource managers, such
as the HP E1306A Command Module or the HP E1300A/E1301A B-size
Mainframes.
The Wait-for-Trigger
State
You must place the multimeter in the wait-for-trigger state after you have
configured it and selected a trigger source. A trigger will not be accepted
until the multimeter is in this state. The measurement sequence begins when
the multimeter is in the wait-for-trigger state and it receives a trigger.
You can place the multimeter in the “wait-for-trigger” state by executing
one of the following commands:
READ?
INITiate
Note The multimeter requires approximately 20ms of set up time after you send
a command to change to the “wait-for-trigger” state. Any triggers that
occur during this set up time are ignored.
The Trigger Count The TRIGger:COUNt <number> command sets the number of triggers the
multimeter will accept in the wait-for-trigger state before returning to the
idle state. Use the number parameter to set the trigger count to a value
between 1 and 50,000. The
MEASure and CONFigure commands set trigger
count to 1.
Substituting
MIN for the number parameter sets the trigger count to 1.
Substituting
MAX for the number parameter sets the trigger count to 50,000.