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Chapter 5 Temperature Compensation
This chapter explains how to use the Temperature Compensation facilities, to compensate for changes in the
measurement with ambient temperature.
Temperature compensation is only provided when an optional module consisting of a digital temperature sensor is
wired to the DCell or DSC.
Purpose and Method of Temperature Compensation
Most measurement methods are affected by changes in temperature, and (uncompensated) load cells are especially
sensitive, having a large overall temperature coefficient.
Temperature compensation adjusts the measured value in a way that depends on a temperature measurement, so
that (ideally) the output does not depend on the current temperature.
In practice, it is usual to refer to a calibration 'reference' temperature: The ideal output value is then what the
reading 'would have been' if made at the reference temperature.
The DCell/DSC temperature compensation facilities make adjustments to the 'Cell' calibration parameters (i.e. gain
and offset) which depend on temperature, according to a digitally programmed curve.
These adjustments are automatically applied, based on the current device temperature measurement. With some
care, this can remove the need for the usual electrical compensation components altogether.
Note that the temperature compensation will also remove the temperature drift of the DCell/DSC itself if the
temperature compensation data is collected when the DCell/DSC and strain gauges are tested together as a system.
Temperature Module Connections and Mounting (DTEMP)
The temperature module is a connected using only two wires. The temperature sensor is the Dallas "1-Wire" digital
device DS18S20.
DCELL connections to DTEMP
One connection is ground for which –EXC is used and the other is the 1 wire "DQ" connection which provides the bi-
directional data line.
DSC connections to DTEMP
For the DSC "TS" on the I/O connector is connected to "DQ" of the DTEMP module and "GND" of the DSC is
connected to "-EXC"
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Micron Meters
DCell & DSC User Manual
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