User Manual

2400 Series SourceMeter
®
User’s Manual Triggering 11-11
mands from the Trigger Subsystem. Key remote commands are included in the
trigger model. Also note that the GPIB defaults are denoted by the “✛” symbol.
The primary actions of the trigger model are Source, Delay, and Measure. The
source action outputs the programmed voltage or current value, and the pro-
grammed delay provides a settling period for the source before the measurement
is performed.
The trigger model consists of two layers (Arm Layer and Trigger Layer) to provide
versatility. Programmable counters allow operations to be repeated, and various
input and output trigger options are available to provide source-measure synchro-
nization between the SourceMeter and other instruments (via the Trigger Link).
Idle and initiate
The instrument is considered to be in the idle state (ARM annunciator off) when it
is not operating within the trigger model layers. While in the idle state, the instru-
ment cannot perform any measurements. An initiate command is required to take
the instrument out of idle. The following commands perform an initiate operation:
• :INITiate
•:READ?
• :MEASure?
Conversely, if the unit is taking readings, most commands (except DCL, SDC,
IFC, and ABORt) are queued up and will not be executed until the unit returns to
idle.
When auto output-off is disabled (:SOURce1:CLEar:AUTO OFF), you must first
turn the source output on before sending the :INITiate or :READ? command. The
:MEASure? command will automatically turn the output on. Note that after the
instrument returns to the idle state, the output will remain on.
When auto output-off is enabled (:SOURce1:CLEar:AUTO ON), any of the above
three commands can be used to initiate operation. The source output will auto-
matically turn on at the beginning of each SDM (source-delay-measure) cycle and
turn off after each measurement is completed.