Section 14: SCPI command reference
Model 6517B Electrometer Reference Manual
14-142
6517B-901-01 Rev. C / August 2015
:CONTrol <name>
This command is used to specify the buffer control.
Usage
:TRACe:FEED:CONTrol <name>
:CONTrol?
<name>
NEVer:
Disables buffer storage
NEXT:
Fills buffer and stops
ALWays:
Continuously stores readings in buffer
PRETrigger:
Use Pretrigger mode to store readings
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
(on page 14-50).
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
(on page 14-50)
:ELEMents <item list>
(on page 14-53)
