Keithley 2002

IEEE-488 Reference
3-150
:READ?
This command is used to specify how much of the defined buffer (:POINts) will be used to store
pre-triggered readings. This command is essentially the same as the :PERCent command except
the amount is expressed as an exact value instead of a percent.
Sending a value that exceeds the defined size of the buffer (see :POINts) generates an error. The
command is ignored.
PRINT #1, "output 16; :trac:poin; 75" ' Set buffer size
PRINT #1, "output 16; :trac:feed:pret:amo:read 30; read?" ' 30 pre-trugger
rdgs for buffer
PRINT #1, "enter 16" ' Get response from
2002
:SOURce <name>
:TRACe:FEED:PRETrigger:SOURce <name> Specify pre-trigger event
<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
:SOURce? Query buffer source.
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.
PRINT #1, "output 16; :trac:feed:pret:sour bus; sour?" ' Select bus pre-trig-
ger
PRINT #1, "enter 16" ' Get response from
2002
:CONTrol <name>
:TRACe:FEED:CONTrol <name> Specify buffer control
<name> = NEVer Disables buffer storage
NEXT Fills buffer and stops
ALWays Continuously stores readings in buffer
PRETrigger Use Pretrigger mode to store readings
:CONTrol? Query buffer control
Query
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Query