To Next Page

To Previous Page

IEEE-488 Reference

3-139

3.23.4 :FEED Commands

:[PERCent] <n>

:TRACe:FEED:PRETrigger:AMOunt:[PERCent] <n> Specify percent of pre-trigger readings

Parameters <n> = 0 to 100 % 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

Query :[PERCent]? Query percent of pre-trigger readings

Description This command is used to specify how much of the deﬁned buffer (:POINts) will be used to store

pre-triggered readings. When a pre- trigger store is started (see :FEED:CONTrol), readings are

continuously stored in the buffer. When the pre-trigger event occurs (see :PRETrig-

ger:SOURce), post-trigger readings will then 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 oc-

curs, subsequent readings will then be 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. See paragraph 2.16.1 for more information on pre-

trigger.

:READings <n>

:TRACe:FEED:PRETrigger:AMOunt:READings <n> Specify number of pre-trigger readings

Parameters <n> = 0 to MAXimum Specify number or readings

DEFault Half of MAXimum

MAXimum Buffer size as programmed by :TRACe:POINts

MINimum 0

Query :READings? Queries number of pre-trigger readings

:READings? DEFault Queries *RST default number of readings

:READings? MAXimum Queries largest allowable number of readings

:READings? MINimum Queries lowest allowable number of readings

Description 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.

Keithley 6517A User Manual

Other manuals for Keithley 6517A