4 Features and Functions
148 Keysight 34970A/34972A User’s Guide
Mx+B Scaling
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 remove a channel from the scan list (by selecting
CHANNEL OFF from the front panel or by redefining the scan list from the
remote interface), scaling is turned off for that channel but the gain and offset
values are not cleared. If you decide to add that 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.
– You can make a null measurement on a channel and store it as the offset (“B”)
for subsequent measurements. This allows you to adjust for voltage or resistive
offsets through your wiring to the point of the measurement.
– During a Monitor operation, the gain and offset values are applied to all
readings on the specified channel.
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