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In Pi Maths make a new channel with whatever channel name and units you want. Set the frequency rate to the same as the 'Speed' sampling rate. The channel 'code' only needs:
deriviate ([Speed] , ignore)
NB: It's case sensitive. And make sure you get the units right. If speed is in km/h you need to divide it by 3.6 to get it to m/s and by 9.81 to get the resulting trace go G.
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