Re: [lro] Re: Alternator tach signal

From: David Scheidt (dmschei@attglobal.net)
Date: Thu Jan 02 2003 - 12:50:03 EST

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    >--- Keith Tanner <keith@miata.net> wrote:
    >
    >> I don't know about you guys, but my alternator turns at a
    >> different speed
    >> than my crankshaft. There may be some interesting math
    >> involved.
    >
    >Hence my comment about calibrating it on the vehicle
    >against a known good reference. Things like this are why
    >yours truly owns a mechanical interface digital tachometer.
    >

    The tachs I'm familiar with can be adjusted for a number of pulses
    per revolution -- say 3 to 30. You set a coarse adjustment switch,
    and then fiddle with a trimming pot until it matches your reference
    tach.
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