7-4 Triggering Model 6485 Picoammeter Instruction Manual
The difference between front panel operation (Figure 7-1) and remote operation
(Figure 7-2) is within the idle state of the instrument. Nomenclature in Figure 7-1 relates
to the various names used for configuration menu items while Figure 7-2 provides the
SCPI commands to control operation.
Idle and initiate
While in the idle state, the instrument cannot perform measurements. While in idle, the
reading remains frozen or dashes replace the reading (i.e. -.------ A). Once Model 6485 is
taken out of idle, operation proceeds through the trigger model.
Front panel operation — As shown in Figure 7-1, Model 6485 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 6485 can be put into the idle state at any time by press-
ing the HALT key. To take the instrument out of idle, press the TRIG key. Other front
panel keys can be pressed instead, but they may change the setup.
Remote operation — As shown in Figure 7-2, 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 exe-
cuted 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 10 for
details on general bus commands).
Trigger model operation
Once the instrument is taken out of idle, operation proceeds through the trigger model to
perform a measurement (measure action).
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