3 Features and Functions
146 Keysight 34980A Mainframe User’s Guide
Mx+B Scaling
The scaling function allows you to apply a gain and offset to readings during a
scan or while making measurements in the stand-alone DMM mode. In addition to
setting the gain (“M”) and offset (“B”) values, you can also specify a custom
measurement label for your scaled readings (RPM, PSI, etc.). You can apply
scaling to any multiplexer channels and for any measurement function. Scaling is
not allowed with any of the channels on the digital modules.
– Scaling is applied using the following equation:
Scaled Reading = (Gain x Measurement) + Offset
– If you change the measurement configuration (function, transducer type, etc.)
on a channel or the internal DMM, scaling is turned off on those channels but
the gain and offset values are not cleared.
– If you plan to use scaling on a channel which will also use alarms, be sure to
configure the scaling values first. If you attempt to assign the alarm limits first,
the instrument will turn off alarms and clear the limit values when you enable
scaling on that channel. If you specify a custom measurement label with
scaling, it is automatically used when alarms are logged on that channel.
– If you redefine the scan list, no change will be made to the scaling state or the
gain and offset values. If you decide to add a channel back to the scan list, the
original gain and offset values are restored.
– You can specify a custom label with up to three characters. You can use letters
(A-Z), numbers (0-9), an underscore ( _ ), blank spaces, or the “#” character
which displays a degree symbol ( ° ) on the front panel (displayed as a “#” in an
output string from the remote interface).
– The maximum value allowed for the gain and offset is ±1E+15.
–The CONFigure and MEASure? commands automatically set the gain (“M”) to
1 and offset (“B”) to 0.
– A Factory Reset (*RST command) turns off scaling, clears the scaling values on
all channels, and sets the custom label to a null string (“ ”). An Instrument
Preset (SYSTem:PRESet command) does not clear the scaling values and does not
turn off scaling.
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