User`s guide

136

Chapter 4 Features and Functions

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.

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