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IEEE-488 Reference

3-140

:SOURce <name>

:TRACe:FEED:PRETrigger:SOURce <name> Specify pre-trigger event

Parameters <name> = EXTernal Use External Trigger as pre-trigger event

TLINk Use Trigger Link as pre-trigger event

BUS Use bus trigger as pre-trigger event

MANual Use TRIG key as pre-trigger event

Query :SOURce? Query pre-trigger event source

Description This command is used to specify the event for the pre-trigger storage mode. With the pre-trigger

mode selected (:CONTrol, PRETrigger), readings are continuously stored in the buffer while

waiting for the pre-trigger source event.

With EXTernal source selected, an external trigger via the rear panel EXTERNAL TRIGGER

Input provides the pre-trigger event.

With TLINk selected, an input trigger via the Trigger Link provides the pre-trigger event. The

Trigger Link line used for the input trigger is programmed from the Trigger subsystem (see

:TRIGger:TCONﬁgure command path).

With BUS selected, a GPIB bus trigger (GET or *TRG) provides the pre- trigger event.

With MANual selected, pressing the front panel TRIG key provides the pre-trigger event.

:CONTrol <name>

:TRACe:FEED:CONTrol <name> Specify buffer control

Parameters <name> = NEVer Disables buffer storage

NEXT Fills buffer and stops

ALWays Continuously stores readings in buffer

PRETrigger Use Pretrigger mode to store readings

Query :CONTrol? Query buffer control

Description This command is used to select the buffer control. With NEVer selected, storage into the buffer

is disabled. With any of the other selections, storage is performed as long as buffer feed is not

set for NONE (see :TRACe:FEED NONE). When NEXT is selected, the storage process starts,

ﬁlls the buffer and then stops. The buffer size is speciﬁed by the :POINts command.

When ALWays is selected, the storage process starts and continues to store readings even after

the buffer ﬁlls. After the buffer ﬁlls, readings overwrite the previously stored readings.

When PRETrigger is selected, the buffer stores readings continuously (like ALWays) until the

programmed pre-trigger event occurs. When the pre-trigger event occurs, the section of the buff-

er speciﬁed for post-trigger readings ﬁll with new readings. The storage process stops when the

post trigger portion of the buffer becomes full with new readings (see :TRACe:FEED:PRETrig-

ger).

Keithley 6517A User Manual

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