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Programming the DC Source - 7
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Enabling the Measurement Trigger System
When the dc source is turned on, the trigger system is in the idle state. In this state, the trigger system is
disabled and it ignores all triggers. Sending the following commands at any time returns the trigger
system to the idle state:
ABORt
*RST
*RCL
The INITiate commands move the trigger system from the idle state to the initiated state. This enables
the measurement system to receive triggers. To initiate the measurement trigger system, use:
INIT:SEQ2 or INIT:NAME ACQ
After a trigger is received and the data acquisition completes, the trigger system will return to the idle
state (unless multiple triggers are desired). Thus it will be necessary to initiate the system each time a
triggered measurement is desired.
NOTE: The measurement trigger system cannot be initiated continuously. However, it can be
repeated for a limited number of times as explained under "Multiple triggers".
Selecting the Measurement Trigger Source
The trigger system is waiting for a trigger signal in the initiated state. Before you generate a trigger, you
must select a trigger source. The following measurement trigger sources can be selected:
BUS -
Selects GPIB bus triggers. This synchronizes the measurement to the bus
trigger command
INTernal -
Selects the signal as the measurement trigger. This synchronizes the
measurement to the signal condition present at either the main output
(output1) terminals or the DVM inputs.
EXTernal -
Selects the external trigger input as the measurement trigger source. This
capability only applies to units with firmware revision A.03.01 and up.
To select GPIB bus triggers, use:
TRIG:SEQ2:SOUR BUS or TRIG:ACQ:SOUR BUS
To select internal triggers use:
TRIG:SEQ2:SOUR INT or TRIG:ACQ:SOUR INT
To select external triggers use:
TRIG:SEQ2:SOUR EXT or TRIG:ACQ:SOUR EXT
Selecting the Sensing Function
There is only one measurement system in the dc source. The measurement system supports voltage
measurements at the main output, current measurements at the main output, and DVM input
measurements. Before you generate a measurement trigger, you must specify one of the following
measurement functions:
SENS:FUNC "CURR" or
SENS:FUNC "VOLT" or
SENS:FUNC "DVM"