Model 6485 Picoammeter Instruction Manual Triggering 7-5
NOTE The following discussion focuses on the front panel trigger model (Figure 7-1).
However, 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
appropriate TLink control source is selected. See TLink control source (Arm-In and Trig-
ger-In) as follows for details.
Arm-In source — The Arm-In control sources are explained as follows:
• Immediate (ARM:SOURce IMMediate) — Event detection for the arm layer is
satisfied immediately allowing operation to continue into the trigger layer.
• GPIB (ARM:SOURce BUS) — Event detection for the arm layer is satisfied when
a bus trigger (GET or *TRG) is received by Model 6485.
• Timer (ARM:SOURce TIMer) — Event detection for the arm layer is immedi-
ately satisfied after the instrument leaves the idle state. Detection for each subse-
quent pass is satisfied when the programmed timer interval elapses. The timer
resets to its initial state when the instrument goes back into idle.
• Manual (ARM:SOURce MANual) — Event detection for the arm layer is satis-
fied by pressing the TRIG key. Model 6485 must be in the local mode for it to
respond to the TRIG key. Press LOCAL or send LOCAL 14 over the bus to place
Model 6485 in local.
• TLink (ARM:SOURce TLINk) — Event detection for the arm layer is satisfied
when an input trigger via the TRIGGER LINK connector is received by Model
6485. Note that if the source bypass is set to ONCE (ARM:DIRection SOURce),
operation will initially loop around the source detector after the instrument leaves
the idle state. Detection for each subsequent pass is satisfied by an input trigger.
The bypass resets when the instrument goes into idle.
Trigger-In source — The Trigger-In control sources are explained as follow:
• Immediate (TRIGger:SOURce IMMediate) — Event detection for the trigger
layer is satisfied immediately allowing operation to continue to perform a measure-
ment.
• TLink (TRIGger:SOURce TLINk) — Event detection for the trigger layer is satisfied
when an input trigger via the TRIGGER LINK connector is received by Model 6485.
Note that if the source bypass is set to ONCE (TRIGger:DIRection SOURce), operation
will loop around the source detector on the initial pass through the arm layer. Detection
for each subsequent pass is satisfied by an input trigger. The bypass resets when Model
6485 leaves the trigger layer.
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