Measurement Queries; Fetch - Keithley 2701 User Manual

3-58 Basic DMM Operation
Example #4 — Scan configuration (Model 7700)
The following commands configure scan channels 101, 102, and 121 of a Model 7700
installed in slot 1. When channel 101 is scanned, DCV will be selected. When channel 102
is scanned, Ω2 will be selected. When channel 121 is scanned, DCI will be selected.
NOTE
FUNC 'VOLT',(@101)
FUNC 'RES',(@102)
FUNC 'CURR',(@121)
NOTE

Measurement queries

NOTE

:FETCh?

What it does
This command will simply return the latest available reading from an instrument.
Limitations
If the instrument does not have a reading available (indicated by dashes in the display),
sending this command will cause a –230, "Data corrupt or stale" error. This query will not
cause the box to trigger a reading nor will it "wait" for a result if a reading is in progress.
It is possible to get the same reading over and over using this query. It will continue to
give the same result until one of two things has happened:
•
•
The following example can be run from the KE2700 Instrument Driver using the
example named "ConfigChan" in Table G-1 of Appendix G.
' Configure scan channel 101 for DCV.
' Configure scan channel 102 for Ω2.
' Configure scan channel 121 for DCI.
Detailed information on scanning is provided in Section 7.
For more information on read commands, see Section 8 (Triggering), Section 13
(SCPI Signal Oriented Measurement Commands), and Appendix D (Signal
Processing Sequence and Data Flow).
A new reading has been triggered.
The old reading has been invalidated by changing ranges or by changing function.
Model 2701 User's Manual