Model 6517B Electrometer Reference Manual Section 14: SCPI command reference
6517B-901-01 Rev. C / August 2015 14-141
:READings <b>
This command is used to specify the number of pre-trigger readings.
Usage
:TRACe:FEED:PRETrigger:AMOunt:READings <n>
:READings?
:READings? DEFault
:READings? MAXimum
:READings? MINimum
<n>
0 to MAXimum: Specify number or readings
DEFault: Half of MAXimum
MAXimum: Buffer size as programmed by :TRACe:POINts
MINimum: 0
Details
This command is used to specify how much of the defined buffer (:POINts) is used to store pre-
triggered readings. This command is essentially the same as the previous :PERCent command
except the amount is expressed as an exact value rather than a percent.
Sending a value that exceeds the defined size of the buffer generates an error. The command is
ignored.
Also see
:POINts <n> (on page 14-138)
:SOURce <name>
This command is used to specify a pre-trigger event.
Usage
:TRACe:FEED:PRETrigger:SOURce <name>
:SOURce?
<name>
TLINk: Use trigger link as pre-trigger event
BUS: Use bus trigger as pre-trigger event
MANual: Use TRIG key as pre-trigger event
Details
This command is used to specify the event for the pre-trigger storage mode. With the pre-trigger
mode selected, readings are continuously stored in the buffer while waiting for the pre-trigger source
event.
With TLINk selected, an input trigger through the trigger link provides the pre-trigger event. The
trigger link line used for the input trigger is programmed from the trigger subsystem.
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.
Also see
:CONTrol <name> (on page 14-142)
:PROTocol <name> (on page 14-151)
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