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Chapter 4 Command Reference
Introduction
Programming Guide 4-57
:READ[[:SCALar]:<function>]?
This query provides a method of performing a :FETCh? on fresh data.
A common application is to use this command in conjunction with a :CONFigure
to provide a capability like :MEASure? in which the application programmer is
allowed to provide fine adjustments to the instrument state by issuing the
corresponding commands between the :CONFigure and :READ?.
When [:SCALar]:<function> is specified, the instrument will retrieve the specified
result if it matches the current measurement type or can be derived from the
current measurement type. The only functions which can be derived from a
different measurement type are:
• frequency to/from period,
• voltage minimum to/from voltage maximum,
• voltage minimum to/from voltage peak-to-peak, and
• voltage maximum to/from voltage peak-to-peak.
When [:SCALar]:<function> is omitted, the function specified/used by the last
:CONFigure, :MEASure, :READ, or FETCh will be used,
if possible. This behavior is apparent when switching between frequency and
period, or when switching among the voltage peaks functions.
Issuing this query while a measurement is in progress will result in this query
aborting the current measurement and idling the measurement cycle before
initiating the desired measurement,
and then waiting for the measurement to complete. Consequently, this has the
effect of holding off further commands from being processed until the desired
measurement completes. This hold-off action can only be canceled by the
measurement completing, Device Clear, or power-on.