The software feature that can be used to calculate a signal's RMS in LabChart is the Arithmetic Channel Calculation, which is accessible via the "Channel Setting..." option under the Setup Menu or by left mouse clicking a given channel's title. Below are the following Arithmetic Channel Calculation equations that can be used to calculate various forms of RMS.
- rms(source channel, window width in seconds) - calculates the root mean square of the source channel with a triangular (Bartlett) averaging window.
- sqrt(smoothsec((source channel)^2, window width in seconds)) - alternative form that performs the same calculation as the basic rms() function.
- sqrt(averagesec((source channel)^2, window width in seconds)) - calculates the root mean square of the source channel with a simple un-weighted (boxcar) averaging window.
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