HP 34970A manual Mx+B Scaling

Chapter 4 Features and Functions

Mx+B Scaling

Mx+B Scaling

The scaling function allows you to apply a zt” and yx 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 ” 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 4

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,

ux “x t. 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 tx 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.

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