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    new meter choices

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    icky

    Posts : 5
    Join date : 2009-07-13
    Age : 61

    new meter choices

    Post by icky on Fri Oct 17, 2014 12:41 am

    This subject has been covered, but I am in the market for a new VOM or a VTVM , and I need capacitance testing function. I was wondering if a separate cap meter would be preferable over the meters with it included as a function? I also consider older equipment, i.e., gently used, no longer made, EICO,Sencore, or B&K. Also, is it worth having a cap decade or substitution box?. Having recent problems with my VTA ST-70 and some other issues with my other audio components I'm looking to improve my diagnostic ability with a test equipment purchase.  confused Thanks, Jeff

    ramon68

    Posts : 87
    Join date : 2009-04-12
    Age : 76
    Location : naples fl

    Re: new meter choices

    Post by ramon68 on Fri Oct 17, 2014 6:53 am

    I can't speak to the separate cap meter issue but I bought an Elenco LCM1950 multimeter from Parts Express and it measures capacitance and inductance very accurately.
    Look it up on Parts Express' website. Costs 95 bucks.

    Bob Latino
    Admin

    Posts : 2415
    Join date : 2008-11-26
    Location : Massachusetts

    Re: new meter choices

    Post by Bob Latino on Fri Oct 17, 2014 8:50 am

    icky wrote:This subject has been covered, but I am in the market for a new VOM or a VTVM , and I need capacitance testing function. I was wondering if a separate cap meter would be preferable over the meters with it included as a function? I also consider older equipment, i.e., gently used, no longer made, EICO,Sencore, or B&K. Also, is it worth having a cap decade or substitution box?. Having recent problems with my VTA ST-70 and some other issues with my other audio components I'm looking to improve my diagnostic ability with a test equipment purchase.  confused  Thanks, Jeff

    Hi Jeff,

    You have brought up a good point mentioning that your purchase of a new multitester will have a capacitor testing function. Every DIY tube person should have a capacitor tester in his arsenal of diagnostic tools. Without a capacitor tester, you are limited in what you can do to track down noise/hum or other issues in your home built amp/preamp.

    Bob

    PeterCapo

    Posts : 386
    Join date : 2008-12-05

    Re: new meter choices

    Post by PeterCapo on Fri Oct 17, 2014 10:39 am

    Although, the capacitance measuring function of many (if not most) multimeters can be limited, in particular, even LCR meters can have trouble measuring in the low pf range if your purpose is to verify the values of some of the smaller-value caps in these amps.

    In any case, have a look at the following models from Radio Shack: catalog #s 22-075 and 22-087.  I have a similar predecessor model (catalog number 22-812), and it is really a pretty good meter.  I brought it to a local electronics facility that calibrates highfalutin equipment for area companies, including an aerospace company where a friend works. They tested all settings and ranges of this meter and no calibration was necessary - everything was in-spec. *BUT, although good, inexpensive meters, note that the other ranges of these Radio Shack meters may be too limited, as well. Look at the specs before purchasing.*

    I looked for decade boxes a while back but couldn't find one for a reasonable cost that was rated for enough power to use in a Dynaco amp (for testing purposes).


    Last edited by PeterCapo on Fri Oct 17, 2014 11:03 am; edited 1 time in total (Reason for editing : Add information)

    Guest
    Guest

    Re: new meter choices

    Post by Guest on Fri Oct 17, 2014 10:45 am

    PeterCapo wrote:Although, the capacitance measuring function of many (if not most) multimeters can be limited, in particular, even LCR meters can have trouble measuring in the low pf range if your purpose is to verify the values of some of the smaller-value caps in these amps.

    In any case, have a look at the following models from Radio Shack: catalog #s 22-075 and 22-087.  I have a similar predecessor model (catalog number 22-812), and it is really a pretty good meter.  I brought it to a local electronics facility that calibrates highfalutin equipment for area companies, including an aerospace company where a friend works. They tested all settings and ranges of this meter and no calibration was necessary - everything was in-spec.

    I looked for decade boxes a while back but couldn't find one for a reasonable cost that was rated for enough power to use in a Dynaco amp (for testing purposes).

    ditto on that low capacitance reading ability, my meter has capacitance reading, but is no good for really low values, not a huge deal, but now and then I do need it.
    I should also add that I have purchased a BK Precision capacitance meter model 890C, https://www.bkprecision.com/products/component-testers/890C-dual-display-capacitance-meter-to-50-mf.html, it should arrive next week

    sKiZo

    Posts : 1313
    Join date : 2013-04-01
    Location : Michigan USA

    Re: new meter choices

    Post by sKiZo on Fri Oct 17, 2014 1:33 pm

    Hard to beat Tenma for value ... I think I paid $60 for mine and it does everything I want it to.

    Trick for testing capacitance is to keep the probe leads as short as possible. My meter came with a special pair just for that.

    Guest
    Guest

    Re: new meter choices

    Post by Guest on Fri Oct 17, 2014 1:39 pm

    sKiZo wrote:Hard to beat Tenma for value ... I think I paid $60 for mine and it does everything I want it to.

    Trick for testing capacitance is to keep the probe leads as short as possible. My meter came with a special pair just for that.

    yes, or get a meter with 'lead zeroing' capabilities!

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