Fall 2012 ME 395 - GSI Josh Lacey

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 Quick Note on the Tachometer RPM

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acbash



Posts : 4
Join date : 2012-09-12

PostSubject: Quick Note on the Tachometer RPM   Sat Nov 03, 2012 7:54 pm

I just wanted to note that in the data files (in ours, at least), even though the column heading says "tachometer (RPM)", it is NOT in RPM; it's in V. You can convert it to RPM by multiplying by the Tachometer Gain (310 RPM/V).

Also, our PID controller data files have the labels "Target Speed, R (RPM)" and "Proportional Gain, Kp" switched, so watch out for that as well. It shouldn't really matter and it's easy to tell they are switched - but I thought our group had screwed up the input into the program at first, so it might be nice just to note it for anyone else wondering.
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GSI Overlord
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Join date : 2012-08-30

PostSubject: Re: Quick Note on the Tachometer RPM   Sat Nov 03, 2012 11:25 pm

You are correct about the PID output files...that is a mistake in the LabVIEW VI code that is saving the data to a text file. I posted a sticky about this earlier this evening as another student caught this as well.

And yes, it's not just your data file...all the text files have the tach column listed as a voltage that will need to be converted into an RPM using the Tach Gain of 310 RPM/V.
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