B&K Precision 5491B - Manual - Manual (Page 51)

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= 1 or ON Enable auto range
0 or OFF Disable auto range
Query:
:AUTO? Query auto range (ON or OFF)
Description:
These commands are used to control auto ranging. With auto ranging enabled, the instrument
automatically goes to the most ideal range to perform the measurement.
The auto range command (:RANGe:AUTO) is coupled to the command that manually selects the
measurement range (:RANGe ). When auto range is enabled, the parameter value for :RANGe
changes to the automatically selected range value. Thus, when auto range is disabled, the
instrument remains at the automatically selected range. When a valid :RANGe command is
sent, auto ranging disables.
:REFerence Commands
:REFerence
Command syntax:
:VOLTage:AC:REFerence Specify reference for ACV
:VOLTage:DC:REFerence Specify reference for DCV
Command parameter:
= -757.5 to 757.5 Reference for ACV
-1010 to 1010 Reference for DCV
DEFault 0 (All measurement functions)
MINimum Minimum value for specified function
MAXimum Maximum value for specified function
Query:
:REFerence? Query reference for relative function
Description:
These commands are used to establish a reference value for the specified function. When reference
is enabled (:REFerence:STATe), the result will be the algebraic difference between the input signal
and the reference value:
Reading = Input signal – Reference
From the front panel, reference is called relative (REL).
The :REFerence command is coupled to the :ACQuire command. The last command sent
(:REFerence or :ACQuire) establishes the reference. When a reference is set using
the :REFerence command, the REFerence? query command returns the programmed value.
Conversely, when a reference is set using the :ACQuire command, the :REFerence? query
command returns the acquired reference value.
(Note: In order to send a REFerence? query, the reference value must be set either