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Mx+B Scaling Overview
See also “Mx+B Scaling” in chapter 4 starting on page 119.
The scaling function allows you to apply a gain and offset to all readings
on a specified multiplexer channel during a scan. 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 digital channels on the
multifunction module.
• Scaling is applied using the following equation:
Scaled Reading = (Gain x Measurement) - Offset
• You must configure the channel (function, transducer type, etc.)
before applying any scaling values. If you change the measurement
configuration, scaling is turned off on that channel and the gain and
offset values are reset (M=1 and B=0). Scaling is also turned off when
you change the temperature probe type, temperature units, or disable
the internal
DMM.
• 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, scaling is turned off on those channels
but the gain and offset values are not cleared. If you decide to add a
channel back to the scan list (without changing the function),
the original gain and offset values are restored and scaling is turned
back on. This makes it easy to temporarily remove a channel from the
scan list without entering the scaling values again.
• A Factory Reset (*RST command) turns off scaling and clears the
scaling values on all channels. An Instrument Preset (SYSTem:PRESet
command) or Card Reset (SYSTem:CPON command) does not clear the
scaling values and does not turn off scaling.
Chapter 5 Remote Interface Reference
Mx+B Scaling Overview
244