Idle And Initiate; Trigger Model Operation - Keithley 2000 User Manual

4-30 Remote Operation

Idle and initiate

The instrument is considered to be in the idle state whenever it is not operating. While in the
idle state, the instrument cannot perform any measure or scan functions. You can send two com-
mands over the bus to remove the instrument from the idle state:
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•
With continuous initiation enabled (:INITiate:CONTinuous ON), the instrument will not re-
main in the idle state after all programmed operations are completed. However, you can return
the instrument to the idle state at any time by sending any of these commands:
•
•
•
•

Trigger model operation

Once the instrument is taken out of idle, operation proceeds through the trigger model down
to the device action. In general, the device action includes a measurement and, when scanning,
closes the next channel.
Control Source — As shown in Figure 4-11, a control source is used to hold up operation
until the programmed event occurs. The control source options are explained as follows:
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•
•
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•
Delay — A programmable delay is available after the event detection. The delay can be man-
ually set from 0 to 999999.999 seconds, or Auto Delay can be used. With Auto Delay enabled,
the instrument automatically selects a delay based on the selected function and range. See the
Auto Delay table in Section 3 for delay times.
Auto Delay is typically used for scanning. The nominal delay will be just long enough to al-
low each relay to settle before making the measurement.
:INITiate
:INITiate:CONTinuous ON
*RST
ABORt
*RCL
SYST:PRES
IMMediate — Event detection is immediately satisfied allowing operation to continue.
MANual — Event detection is satisfied by pressing the TRIG key. The Model 2000 Mul-
timeter must be in LOCAL mode for it to respond to the TRIG key. Press the LOCAL
key or send LOCAL 16 over the bus to remove the instrument from the remote mode.
TIMer — Event detection is immediately satisfied on the initial pass through the loop
Each subsequent detection is satisfied when the programmed timer interval (0 to
999999.999) seconds elapses. The timer source is only available during step/scan oper-
ation. The timer resets to its initial state when the instrument goes into the normal mode
of operation or into the idle state.
EXTernal — Event detection is satisfied when an input trigger via the TRIGGER LINK
connector is received by the Model 2000 Multimeter.
BUS — Event detection is satisfied when a bus trigger (GET or *TRG) is received by
the Model 2000 Multimeter.