Capacitance Meter

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This topic contains 18 replies, has 10 voices, and was last updated by RICHARD A. WHITE RICHARD A. WHITE 4 years, 2 months ago.

Viewing 15 posts - 1 through 15 (of 19 total)
  • Buccaneer
    Buccaneer
    US Member - 1 Year
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    #917

    What’s a cheap capacitance meter that you’ve had good luck with?
    Would like to check some of the condensers I buy or have to
    see what rating they actually have.
    Thanks, TG

    Prepare to be boarded!

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    chris-p
    Canada Member - 1 Year
    Replies: 2455
    Topics: 157
    #11931

    I was going to buy this but forgot to bid. Cheap enough. I have a few Mercotronics and Stevens testers I use myself.

    http://www.ebay.com/itm/351336595557?_t … EBIDX%3AIT

    Buccaneer
    Buccaneer
    US Member - 1 Year
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    #11933

    It was probably better than all the Chinese ones I see for sale.
    I’m hoping to hear from someone that bought a cheap one
    and it actually worked, lol.

    Prepare to be boarded!

    frankr
    frankr
    US Member - 1 Year
    Replies: 4046
    Topics: 43
    #11934

    Well I’ll be darned–I have one of those. Bought it 30 or 40 years ago. It works, but doesn’t give actual capacitance values. You compare the flashing rate with a known good one of similar capacitance. The higher the capacitance, the slower it flashes. The theory of operation is downright simple. The "guts" are a couple of diodes & resistors and a neon bulb.

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    chris-p
    Canada Member - 1 Year
    Replies: 2455
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    #11935

    There are a lot of cheap meters that will tell you the capacitance. That is the easy part. You can also use a cheaper meter to test for shorts, if you know what you are looking for in the spikes. That is where I find about half the condensors I test fail.

    The Mercotronics and Stevens testers make all that very easy, if you can find one. I would consider 25 bucks for that one meter I posted pretty cheap for what you get. You can get Mercotronics anywhere from about 50 bucks to 200 depending on condition.

    Buccaneer
    Buccaneer
    US Member - 1 Year
    Replies: 2919
    Topics: 817
    #11936

    Chris, Would you elaborate a little regarding "spikes" while testing
    condensers for shorts? I’ve noticed some charge up a lot slower
    than others when checking with a digital ohm meter.
    Also, regarding testers, my uncle has an old Bosch Coil / Condenser
    test meter almost identical to the one in the link.
    He used it as a snowmobile mechanic back in the 70’s, but
    doesn’t remember much about it, and has no manual. I found
    a manual online, but it’s in German 🙁
    Going by some of the photos in the manual, I tried testing
    a coil and condenser, but nothing happened. When turned on,
    something inside does "wind up"……. motor?
    I’m guessing a spark should jump the electrodes when coil testing,
    but what happens when testing a condenser on one of these?
    http://www.grayhitandmiss.com/Outboards … tester.jpg
    Thanks, TG

    Prepare to be boarded!

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    chris-p
    Canada Member - 1 Year
    Replies: 2455
    Topics: 157
    #11937

    Rather than me type something out, have a read here. F_R above would be the best to guide you, he pretty much wrote this.

    http://www.pochefamily.org/outboard/Con … sting.html

    Here is for coils/points.

    http://www.pochefamily.org/outboard/Coils.htm

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    ddwilson
    US Member - 2 Years
    Replies: 231
    Topics: 28
    #11938

    I have a wavetech multimeter that reads capaciitance can probably find one for around 100

    Doug

    how is it motors multiply when the garage lights get
    turned off?

    Mumbles
    Mumbles
    Canada Member - 2 Years
    Replies: 3979
    Topics: 405
    #11941

    To check the value of caps, I use a Supco MFD10 which is great for finding the uF rating of them. My auto ranging volt meter also has a cap function. While the Supco will give me the value, it doesn’t actually test them under load as a Merc O Tronic does.

    http://www.amazon.com/Supco-MFD10-Digit … B000LDF97U

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    jeff-register
    US Member - 1 Year
    Replies: 1056
    Topics: 45
    #11945

    Mumbles,
    You took the thoughts out of my head!! Magnetos run very high voltage thru the caps & to load bank not static test is the only accurate way to test for any voltage leakage. It’s like testing a tire sitting stopped in comparison to load testing at full load & speed rating. A mercotronic or Stevens load tests the cap.
    At MCM electronics I bought a cap & resistance meter for 40 bucks, non load testing . Make sure the cap is suited for the high voltage encountered with magneto use or it will fail in short order as well.
    You can buy many coil & core type caps from automotive use & measure cap mfd rating & use a match like Garry posted a few posts back is one way but then again if it is new old stock may already have leakage from the age of the shelf still new in the box. The high voltage magneto type caps are expensive to manufacture & such a small market such as R.F. transmisson
    Look under Vishay brand MKP18394884 HQ for good magneto metalised caps for replacements or specs for dielectric values to rate. Went a little over with the specs, sorry it’s hard to explain half an reply.

    frankr
    frankr
    US Member - 1 Year
    Replies: 4046
    Topics: 43
    #11947
    quote Chris_P:

    Rather than me type something out, have a read here. F_R above would be the best to guide you, he pretty much wrote this.

    http://www.pochefamily.org/outboard/Con … sting.html

    Here is for coils/points.

    http://www.pochefamily.org/outboard/Coils.htm

    Hmmm, the first link certainly does look familiar. But I didn’t do the second one, although it is very well done. However, I believe there is a probably unintentional error in his points testing method. When testing for closed points continuity, use the lowest available range on your meter. The meter shown in the article has an available X1 scale….very good. But he is using the highest scale…not good. You are looking for a resistance of less than one Ohm with the points closed. El Cheapo meters usually don’t have a X1 scale, so they can’t tell the difference between one Ohm and say, 10 Ohms.

    On the other hand, he is correct in using the high scale when testing for points’ shorting to ground. Should show infinity, which it does.

    Buccaneer
    Buccaneer
    US Member - 1 Year
    Replies: 2919
    Topics: 817
    #11953

    Thanks for the write-ups and links. I printed out the condenser testing
    page to experiment in the garage on a handful of condensers.
    Also, thanks for your input on capacitance testers.
    TG

    Prepare to be boarded!

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    jim-moffatt
    US Member - 1 Year
    Replies: 204
    Topics: 22
    #11963

    Here is my recommendation for a general purpose meter that measure capacitance.

    http://www.mcmelectronics.com/product/T … 0-/72-7720

    its $29.99

    I have a similar meter from MCM and it works very well.
    I measures up to 200 meg ohms so capacitor leakage can be tested.
    It also measures capacitance value.
    For point cleaning it measures down to 0.1 ohm so you can test points with it.

    Avatar
    oltimer

    Replies: 93
    Topics: 1
    #11970

    I use a Model DCM-200 Capacitance Meter. As per Mumbles unit, it will give the value on the one being tested. I use my Merc-o-tronic to load them to see if they are working well. I paid around $80.00 2 years ago for the DCM-200. You can Google it to see what it looks like and does.

    Buccaneer
    Buccaneer
    US Member - 1 Year
    Replies: 2919
    Topics: 817
    #12001

    I’m looking at this one, similar to the DCM-200…….
    http://www.ebay.com/itm/360511141750?_t … EBIDX%3AIT
    Any reason not to get this one?

    Prepare to be boarded!

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