2400 Series SourceMeter
®
User’s Manual SCPI Signal Oriented Measurement Commands 17-3
• The count values of the Trigger Model are set to one.
• The Delay of the Trigger Model is set to zero.
• All math calculations are disabled.
• Buffer operation is disabled.
• Autozero is enabled.
• The source output will turn on.
WARNING When :CONFigure is sent, the output will turn on. Beware of hazard-
ous voltage that may be present on the output terminals.
NOTE This command is automatically asserted when the :MEASure? command is sent.
Acquiring readings
:FETCh?
Description This query command requests the latest post-processed readings stored
in the sample buffer (see Appendix C, “Data Flow”). After sending this
command and addressing the SourceMeter to talk, the readings are sent
to the computer. This command does not affect the instrument setup.
This command does not trigger source-measure operations; it simply
requests the last available readings. Note that this command can repeat-
edly return the same readings. Until there are new readings, this com-
mand continues to return the old readings. For example, assume that the
SourceMeter performed 20 source-measure operations. The :FETCh?
command will request the readings for those 20 source-measure opera-
tions. If :FETCh? is sent while performing source-measure operations
(ARM annunciator on), it will not be executed until the SourceMeter
goes back into idle.
The readings that are acquired depend on which data elements are
selected (Section 18, “Data elements”), and what the instrument is pres-
ently programmed to source-measure. Measure readings take priority
over source readings, and functions not sourced or measured are
assigned the NAN (not a number) value of +9.91e37.
For example, assume that voltage, current and resistance readings are
selected as data elements, and the instrument is programmed to Source
V and Measure I. A reading string acquired by :FETch? will include the
programmed V-Source value and the I-Measure reading. The reading for
resistance will be NAN since resistance was not measured.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
To Next Page
Loading...
Need help?
General
