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Title: Frequency Calcs - Sanity check please Post by: andyrennison on May 20, 2013, 08:03:48 PM Can someone please do me a sanity check on my figures?
Reliant engine, there are 2 sparks per single revolution of the engine, yes?? If so 3000 rpm = 3000 / 60 revolutions per second = 50 revolutions / second = 100 sparks per second THEREFORE a digital tachometer can expect an input of 100 Hz at 3000 rpm ?? Have I got this right guys? The reason I ask is I want to set up the digital tacho I have built. I can feed it known frequencies from my computer for calibration, but I want to get the frequencies right :D:D:D Title: Re: Frequency Calcs - Sanity check please Post by: ROD on May 20, 2013, 08:11:26 PM Sorry,you lost me there. My digi tacho only needed setting for 4 cyls,and it worked.
Title: Re: Frequency Calcs - Sanity check please Post by: Olds on May 20, 2013, 08:45:46 PM Logic seems fine to me.
Title: Re: Frequency Calcs - Sanity check please Post by: andyrennison on May 20, 2013, 08:54:21 PM Cheers ON, it is 2 firings per revolution then - that's the bit I wasn't sure about :) . Rod, I built the electronics for the tacho using a frequency to voltage convertor, and a bar graph driver chip, so it really is "home built" :)
Title: Re: Frequency Calcs - Sanity check please Post by: Manky Monkey on May 20, 2013, 08:55:20 PM ...huh?
Title: Re: Frequency Calcs - Sanity check please Post by: andyrennison on May 20, 2013, 09:18:55 PM :) :) :)
Title: Re: Frequency Calcs - Sanity check please Post by: Manky Monkey on May 20, 2013, 09:24:19 PM Does it have flashing lights?
I like flashing lights. :P Title: Re: Frequency Calcs - Sanity check please Post by: andyrennison on May 20, 2013, 09:29:37 PM Oh yes, in a circle round the outside of the clock :)
Title: Re: Frequency Calcs - Sanity check please Post by: morrag on May 20, 2013, 10:15:16 PM Well, that's alright then........................... ??? ??? ??? ??? ??? ??? ???
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