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Chapter 4 Command Reference
Measurement Instructions (:CONFigure, :FETCh, :MEASure, :READ)
4-52 Programming Guide
Measurement Instructions (:CONFigure,
:FETCh, :MEASure, :READ)
The purpose of these commands is to acquire data using a set of high-level
instructions. These commands are structured to allow you to trade off
interchangeability with fine control of the measurement process. The :MEASure
query provides a complete capability where the instrument is configured, a
measurement is taken, and the results are stored in the Output Queue in one
operation.
When more precise control of the measurement is required,
the :CONFigure and :READ? commands can be used. :CONFigure performs the
configuration portion of the measurement.
:READ? performs the data acquisition and post processing (if any), and then it
places the results in the Output Queue. This allows generic configuration of the
instrument using :CONFigure, and then customization of the measurement with
other commands
(for example, from the [:SENSe] subsystem). :READ? completes the measurement
process.
The :READ? command, in turn, is composed of the :INITiate[:IMMediate] and
:FETCh? commands. :INITiate[:IMMediate] performs the data acquisition. :FETCh?
performs the post-processing function (if any) and places the result in the Output
Queue. This allows more than one FETCh? on a single set of acquired data.
Summary of the Measurement Instruction Commands
:MEASure query This command is the simplest to use, but allows few additional possibilities. This
command lets the Counter configure itself for an optimal measurement, initiate
measurement, and return the result; that is, it provides complete measurement sequence
(:MEAS query is equivalent to the :CONF, :INIT, :FETC? command sequence, but with
no flexibility.)
:CONFigure
:READ?
The combined use of these two commands allows for more control when the Counter
performs measurement, initiates measurement, and returns the result. Use this command
sequence if you are planning for the Counter to perform something in between the
measurement setup and acquisition.
:CONFigure
:INITiate
:FETCh?
This combination of commands allows for the most flexibility . This command sequence
configures the Counter, initiates the measurement as specified, and returns the result.