Event Detection; Arm Layer - Keithley 2500 User Manual

Models 2500 and 2502 User's Manual
While operating within the trigger model (ARM indicator on), most commands will not be
executed until the Model 2500 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

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
for the Arm Event Detector. This bypass can only be used if TLINk, PSTest, NSTest, 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 Model 2500 must
be in LOCAL mode for it to respond to the TRIG key. Press the LOCAL key or send GTL
over the bus to take the Model 2500 out of remote.
TLINk — Event detection occurs when an input trigger via the Trigger Link input line is
received (see
around the Arm Event Detector by setting the event detector bypass (ARM:DIRection) to
SOURce.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
SDC, DCL, or :ABORt place the Model 2500 in the idle state. For fastest
response, use SDC or DCL to return to idle.
"Trigger link" for more information). With TLINk selected, you can loop
Figure 10-9, there is a bypass (ARM:DIRection)
Triggering 10-19