Keithley 6514, Instruction Manual

Page: 121 / 334

9-4 Triggering
Idle and initiate
While in the idle state, the instrument cannot perform measurements. While in idle, the read-
ing remains frozen or dashes replace the reading (i.e. -.------ V). Once Model 6514 is taken out
of idle, operation proceeds through the trigger model.
Front panel operation — As shown in Figure 9-1, Model 6514 immediately leaves the idle
state when it is turned on. Typically, operation remains in the arm and trigger layers of the trigger
model. However, Model 6514 can be put into the idle state at any time by pressing the HALT
key. To take the instrument out of idle, press the TRIG key. Other front panel keys can instead
be pressed, but they may change the setup.
Remote operation — As shown in Figure 9-2, an initiate command is required to take the
instrument out of idle. The following commands perform an initiate operation:
• INITiate
• READ?
• MEASure?
While operating within the trigger model (not in idle), most commands will not be executed
until the instrument completes all of its programmed operations and returns to the idle state. The
IFC, SDC and DCL commands can be executed under any circumstance while operating within
the trigger model. They will abort any other command or query.
The following commands can be executed while operating within the trigger model except
when a READ? or MEASure? is being processed.
• ABORt
• SYSTem:PRESet
• *TRG or GET
• *RST
• *RCL <NRf>
NOTE For fastest response, use SDC or DCL to return to idle (see Section 12 for details on
general bus commands).
Trigger model operation
Once the instrument is taken out of idle, operation proceeds through the trigger model to per-
form a measurement (measure action).
NOTE
The following discussion focuses on the front panel trigger model (Figure 9-1). How-
ever, equivalent SCPI commands are included where appropriate.
Event detectors and control sources
A control source holds up operation until the programmed event occurs and is detected. Note
that there are two detector bypasses. A bypass around a detector is only enabled if the appropri-