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Section 14: SCPI command reference
:CONTrol <name>
This command is used to specify the buffer control.
Usage
:TRACe:FEED:CONTrol <name>
:CONTrol?
<name>
Details
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 NEVer. 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 buffer
specified for post-trigger readings fills with new readings. The storage process stops when the post-
trigger portion of the buffer becomes full with new readings (see :TRACe:FEED:PRETrigger
parameter).
Also see
:POINts <n>
(on page 14-138)
:DATA?
This command
Usage
:TRACe:DATA?
Details
When this command is sent and the Model 6517B is addressed to talk, all the readings stored in the
buffer are sent to the computer. The format that readings are sent over the bus is controlled by the
FORMat subsystem
Note that the buffer elements selected by :TRACe:ELEMents must match the bus elements selected
by :FORMat:ELEMents. Otherwise, the following error occurs when using this command to send
buffer readings over the bus.
+313 Buffer & format element mismatch
Also see
FORMat subsystem
:ELEMents <item list>
14-142
NEVer: Disables buffer storage
NEXT: Fills buffer and stops
ALWays: Continuously stores readings in buffer
PRETrigger: Use Pretrigger mode to store readings
(on page 14-50).
(on page 14-50)
(on page 14-53)
Model 6517B Electrometer Reference Manual
6517B-901-01 Rev. C / August 2015
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