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Section 14: SCPI command reference
[:LATest]?
This command is used to return the latest reading.
Usage
[:SENSe[1]]:DATA[:LATest]?
Details
This query command is used to read the latest instrument reading. This command returns the raw
reading or a reading that is the result of the reference (REL from the front panel) operation. For
example, if a reference value of 1.0 is established, the reading returned by this command is the raw
reading minus 1.0. Calculated (MATH) readings cannot be read with this command.
The reading is returned in exponent form. For example, a 10 V DC reading is displayed on the CRT
as follows:
+1.000000E+01
Notice that the measurement function is not included in the response message. Thus, you may want
to perform a function query after a reading query.
Also see
CALCulate subsystems
:FRESh?
This command is used to return a new reading.
Usage
[:SENSe[1]]:DATA:FRESh?
Details
This query command is used to return a new (fresh) reading. This reading does not request the same
reading twice. If a new reading is triggered, this command waits until the reading is available, rather
than request the old reading.
Sending this query command before the instrument is finished processing previous commands
causes the Model 6517B to lock up. One way to prevent this is to insert an appropriate delay in the
program. The required delay can be up to six seconds. Program Fragment 1 shows how to use a
specific delay with the :FRESh? command.
The *OPC? command can also be used to incorporate the necessary delay. When *OPC? is used
properly, all previous commands are allowed to finish before :FRESh? is executed.
Also see
None
14-58
(on page 14-32)
Model 6517B Electrometer Reference Manual
6517B-901-01 Rev. C / August 2015
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