Features and Functions 2
34980A User’s Guide 41
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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