Chapter 4 Remote Interface Reference
Triggering
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Triggering
The power supply’s triggering system allows a change in voltage and current when
receiving a trigger, to select a trigger source, and to insert a trigger. Triggering the
power supply is a multi-step process.
• First, you must specify the source from which the power supply will accept the
trigger. The power supply will accept a bus (software) trigger or an immediate
trigger from the remote interface.
• Then, you can set the time delay between the detection of the trigger on the
specified trigger source and the start of any corresponding output change. Notice
that the time delay is valid for only the bus trigger source.
• Finally, you must provide an INITiate command. If the IMMediate source is
selected, the selected output is set to the triggered level immediately. But if the
trigger source is the bus, the power supply is set to the triggered level after receiving
the Group Execute Trigger (GET) or *TRG command.
Trigger Source Choices
You must specify the source from which the power supply will accept a trigger. The
trigger is stored in volatile memory; the source is set to bus when the power supply
has been off or after a remote interface reset.
Bus (Software) Triggering
• To select the bus trigger source, send the following command.
‘‘TRIG:SOUR BUS’’
• To trigger the power supply from the remote interface (GPIB or RS-232) after
selecting the bus source, send the *TRG (trigger) command. When the *TRG is
sent, the trigger action starts after the specified time delay if any delay is given.
• You can also trigger the power supply from the GPIB interface by sending the
IEEE-488 Group Execute Trigger (GET) message. The following statement shows
how to send a GET from a Hewlett-Packard controller.
‘‘TRIGGER 705’’ (group execute trigger)
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