Section 14: SCPI command reference Model 6517B Electrometer Reference Manual
14-140 6517B-901-01 Rev. C / August 2015
:FEED Commands
:[PERCent] <n>
This command is used to specify the percent of pre-trigger readings.
Usage
:TRACe:FEED:PRETrigger:AMOunt:[PERCent] <n>
:[PERCent]?
<n>
0 to 100: percent of buffer for pre-trigger readings
DEFault: 50 % of buffer for pre-trigger readings
MINimum: 0 % of buffer for pre-trigger readings
MAXimum: 100 % of buffer for pre-trigger readings
Details
This command is used to specify how much of the defined buffer (:POINts) is used to store pre-
triggered readings. When a pre-trigger store is started, readings are continuously stored in the buffer.
When the pre-trigger event occurs, post-trigger readings fill the part of the buffer that is not reserved
for pre-trigger readings.
For example, assume 25 % of a 100-point buffer is reserved for pre-trigger readings. When the pre-
trigger store is started, readings continuously fill the buffer. When the pre-trigger event occurs,
subsequent readings are stored starting at buffer location 26 and continue until buffer location 100 is
filled. Storage stops after buffer location 100 is filled. The result is 25 pre-trigger readings and 75
post-trigger readings.
Also see
:POINts <n> (on page 14-138)
:CONTrol <name (on page 14-142)
:SOURce <name> (on page 14-135)
Configuring data storage (on page 8-3)
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