Need Multimeter with Tachometer

Discussion in 'Wrenchin' Secrets' started by Dan Gerber, Jul 8, 2018.

  1. Dan Gerber

    Dan Gerber Platinum Level Contributor

    I recently damaged (partially melted/burned the induction pick-up/clamp) my trusty Calterm Electronics 66474 automotive digital test multimeter. I can't find any listing for that model multimeter, or for any parts for it. So, it looks like it's time for a new good quality multimeter with tachometer function....

    Or maybe a hand-held tachometer tool that clamps on the spark plug wire to determine RPM.

    Ideas? Maybe you've had good luck with a certain brand/model that's still available?

    Thanks in advance for helping me out... Again.
    Last edited: Jul 10, 2018
  2. yachtsmanbill

    yachtsmanbill Well-Known Member

  3. Ant Legrand

    Ant Legrand Well-Known Member

    I recently bought an Actron pro series digital multimeter with tach on ebay. It cost me about $11 and works great. There are usually a lot of new and used tachs on ebay for pretty reasonable prices.
  4. Dan Gerber

    Dan Gerber Platinum Level Contributor

    Thanks for the suggestion, yachtsmanbill. So obvious, yet I didn't think of it.

    Unfortunately I couldn't find any specifications for the induction clamps listed on the ebay site, so I have no idea if they're compatible with my Calterm product... Or, are they all the same?

    So, it looks as though I'm going to end up purchasing a new digital multimeter (with induction clamp).

    Any recommendations? Anyone?
  5. Dan Gerber

    Dan Gerber Platinum Level Contributor

    Thank you Anthony.
  6. 70skylark350

    70skylark350 Well-Known Member

  7. 87GN_70GS

    87GN_70GS Well-Known Member

    If you happen to find a multimeter with a frequency counter, you can clip it to the neg side of the coil, and muliply the freq in Hz by 15 to get RPM.
  8. dan zepnick

    dan zepnick Well-Known Member

    I have a fluke 88 with the tach cable.don't use it much anymore, but works good.
  9. Dan Gerber

    Dan Gerber Platinum Level Contributor

    87GN_70GS: Interesting. Why does multiplying the frequency by 15 result in an accurate (I assume) count of RPM?
    [NOTE: I just went out to my garage and found that my Actron multimeter (with the damaged inductive clamp) does have a frequency counter. I'll give it a try as a tach.]

    dan zepnick: The "Fluke" trade name brings back memories about my early days as a trainee electrical inspector at Douglas Aircraft Co. in the late 60's. The Fluke product line apparently was a good one.

    Thank you both for the input, by the way.
  10. yachtsmanbill

    yachtsmanbill Well-Known Member

  11. Dan Gerber

    Dan Gerber Platinum Level Contributor

    Yes I am, yachtsmanbill. Unfortunately, I'll be diverted from my "quest" for another 2+ weeks while I take care of another issue.
    Thank you for the lead, though.
  12. 87GN_70GS

    87GN_70GS Well-Known Member

    The physics works out to 15 rpm/hz. Every engine revolution (crank) , the V8 fires 4 times. So that's 4 spark pulses. Theres 60 sec per min. (a hz means 1/sec). 1 spark per sec is a Hz.

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