Disable or enable voltage autoranging for all functions. In the default mode,
autoranging is enabled (“ON”) and the instrument automatically selects the
optimal settings for the output amplifier and attenuators. With autoranging
disabled (“OFF”), the instrument uses the current amplifier and attenuator
settings. The :AUTO? Query returns “0” (OFF) or “1” (ON).
The APPLy command overrides the voltage autorange setting and
automatically enables autoranging (“ON”).
The advantage of disabling autoranging is to eliminate momentary
disruptions caused by switching of the attenuators while changing
amplitude. However, the amplitude and offset accuracy and resolution (as
well as waveform fidelity) may be adversely affected when reducing the
amplitude below the expected range change.
The “ONCE” parameter has the same effect as turning autoranging “ON”,
and then “OFF”. This parameter allows you to make a one-time change to
the amplifier/attenuator setting before returning to the OFF setting.
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