User Manual
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 operations 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 operating 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), opera-
tion can be programmed to loop around the event detector.
Arm layer
Event Detector Bypass — As shown in Figure 11-3, there is a bypass (ARM:DIRec-
tion) 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 inter-
val 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 SourceM-
eter 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.