Keithley 6482, Справочное руководство, Страница: 107 / 350

8-4 Return to Section Topics 6482-901-01 Rev. A / August 2012
Section 8: Triggering Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual
Arm layer
Bypass arm event detector : As shown in Figure 8-1 , there is a bypass for the arm event detector.
This bypass can only be used if TLINK or STEST is the selected arm-in event. The bypass serves
to allow operation to bypass waiting for an event. With the event detector bypass set to ONCE,
operation will loop around the arm event detector when 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.
GPIB : Event detection occurs when a bus trigger (GET or *TRG) is received.
TIMER : With the timer selected, event detection occurs immediately when the output is turned ON.
On repeated passes through the “Another Arm ? Yes” decision block and event detection occurs
when the programmed timer interval expires. If operation takes the “Another Arm ? No” route, the
timer is reset and event detection is allowed to occur immediately.
MANUAL : Event detection occurs when the TRIG key is pressed.
TLINK : Event detection occurs when an input trigger using the trigger link input line is received
(see “Trigger link” for more information). With TLINK selected, you can loop around the arm event
detector by setting the event detector bypass to ONCE.
↓
STEST: Event detection occurs when the start of test (SOT) line of the OUTPUT ENABLE
connector is pulsed low.
↑
STEST: Event detection occurs when the SOT line of the OUTPUT ENABLE connector is pulsed
high.
↑↓
STEST : Event detection occurs when the SOT line of the OUTPUT ENABLE connector is
pulsed either high or low.
NOTE
STEST can be used only at the beginning of a sweep; STEST should not be used to
trigger each point in a sweep.
See “Input (SOT) line” on page 11-2 for more information.
Trigger layer
The trigger layer uses three event detectors; one for each action (source, delay, and measure).
Bypass source event detector : As shown in Figure 8-1 , there is a bypass for the source event
detector. This bypass is in effect only if TRIGGER-LINK is the selected trigger-in source. With this
event detector bypass set to ONCE, operation will proceed around the Source event detector.
The programmable trigger-in sources for the Trigger layer are described as follows:
IMMEDIATE : With IMMEDIATE selected, event detection for the three detectors is satisfied
immediately. Operation proceeds through the Trigger layer to perform the source, delay, and
measure actions.
TRIGGER-LINK : With TRIGGER-LINK selected, event detection at each enabled detector occurs
when an input trigger using the trigger link input line is received. For example, if the TRIGGER-IN
event for the Source event detector is ON, operation will pause at that detector until an input
trigger is received. If, however, the Source event detector is disabled (OFF), operation will not
pause. Operation will continue and perform the source action.
With the TRIGGER LINK TRIGGER-IN source selected, operation will go around the Source event
detector (
Figure 8-1 ) by setting the event detector bypass to ONCE.