ACR Electronics SmartReader Plus Reference Manual page 29

SmartReader Plus Data Logger
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To set the description, click on the Description field and enter the name.
The logger collects and stores raw data readings. An equation is used to transform the raw
data into measurement units, such as °C, with the current reading shown as a Realtime value.
You can use built-in equations or you can create your own custom equations. See Equations
in the TrendReader guide for further information. To set the equation, click on the Equation
field and select the equation from the drop-down list. To help you select the proper equation,
the Realtime value using the currently selected equation is shown. *
Some channels compensate their output by using the value of another channel. For example,
the calculated value for an RH channel depends on the reading of the RH sensor and the
value of the temperature channel. In such cases, the compensation channel must output in
the correct units. In the case of RH, for example, the temperature channel must output in
units of temperature. Using units of byte counts, switch status, or resistance will give invalid
results.
* Note that if a custom equation is not available when Edit Setup... is selected (e.g.: deleted)
then the equation will be shown as unknown. If a new equation is not selected the Realtime
value will not display correctly. If the logger is backed up the channel will be disabled then
changes to the equation can be made in the graph using the Lines Tab in Graph Settings.
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