Keithley SourceMeter 2400, User Manual, Page: 266 / 594

2400 Series SourceMeter
®
User’s Manual Triggering 11-13
While operating within the trigger model (ARM indicator on), most commands will not be
executed until the SourceMeter completes all of its programmed source-measure opera-
tions and returns to the idle state. The IFC (interface clear), SDC (selected device clear)
and DCL (device clear) commands can be executed under any circumstance while operat-
ing within the trigger model. They will abort any other command or query.
• :ABORt
• :SYSTem:PRESet
• *TRG or GET
• *RST
• *RCL
NOTE SDC, DCL, or :ABORt place the SourceMeter in the idle state. For fastest
response, use SDC or DCL to return to idle.
Event detection
Once the instrument is taken out of idle, operation proceeds through the trigger model to
perform the Source, Delay, and Measure actions.
In general, operation is held up at an event detector until the programmed event occurs.
Note however, that if an event detector has a bypass (:DIRection), operation can be pro-
grammed to loop around the event detector.
Arm layer
Event Detector Bypass — As shown in Figure 11-3 , there is a bypass (ARM:DIRection)
for the Arm Event Detector. This bypass can only be used if TLINk, NSTest, PSTest, or
BSTest is the selected Arm-In Event. The bypass serves to “jump-start” operation. With
the bypass set to SOURce, operation will loop around the Arm Event Detector when an
INITiate command is sent (assuming the output is turned ON).
The programmable arm-in events for the Arm Layer are described as follows:
IMMediate — Event detection occurs immediately allowing operation to continue.
BUS — Event detection occurs when a bus trigger (GET or *TRG) is received.
TIMer — Event detection occurs immediately on the initial pass through the trigger
model. Each subsequent detection is satisfied when the programmed timer interval
elapses. The timer resets to its initial state when the instrument goes into idle.
MANual — Event detection occurs when the TRIG key is pressed. The SourceMeter must
be in LOCAL mode for it to respond to the TRIG key. Press the LOCAL key or send
LOCAL 24 over the bus to take the SourceMeter out of remote.
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