Tenma 72-040 Cap Meter

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  • Solder Boy
    Senior Member
    • Nov 2006
    • 178
    #1

    Tenma 72-040 Cap Meter

    Hi guys! I won this cap meter off Ebay earlier this month.. finally got it today..everything works on it.

    Just have a question about reading the higher capacitance levels.. this thing goes as high as 20 000 uf and the meter has a selector switch on it that says 20mf.

    It has a digital LCD on it.. if I test a used 3300 cap for example.. it reads 3.26 or close to it. Does this mean 3.26x1000 for a reading of 3260uf or does it mean 3.26 and the cap is shot?

    I tested some 6.3 1000uf caps and that was easy... it read 850uf.

    My next question is how much of a leeway eitherway is acceptable before you determine the cap to be bad? Is 850uf on a 1000uf cap ok? I kinda figure 700uf and below is bad.

    Thanks guys!
    www.bcrelectronics.ca
    Tags: None
    • 370forlife
      Large Marge
      • Aug 2008
      • 3112
      • United States
      #2
      Re: Tenma 72-040 Cap Meter

      Almost all caps are rated for a tolerance of +/- 20% (make sure with the data sheet, if you can find one, if you are unsure)

      850/1000=.85
      1-.85 is .15
      .15x100=15

      So 850uf out of a labeled 1000 would be 15% below the labeled rating, which is in spec.

        Comment

        • PCBONEZ
          Grumpy Old Fart
          • Aug 2005
          • 10661
          • USA
          #3
          Re: Tenma 72-040 Cap Meter

          If there is an (M) on a cap then it is +/-20%.
          Don't confuse with the Panasonic/Matsushita [M] though.
          Mann-Made Global Warming.
          - We should be more concerned about the Intellectual Climate.
          -
          Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
          - Dr Seuss
          -
          You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
          -

            Comment

            • PCBONEZ
              Grumpy Old Fart
              • Aug 2005
              • 10661
              • USA
              #4
              Re: Tenma 72-040 Cap Meter

              Yes, 3260uf
              Mann-Made Global Warming.
              - We should be more concerned about the Intellectual Climate.
              -
              Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
              - Dr Seuss
              -
              You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
              -

                Comment

                • Quasar
                  Senior Member
                  • Sep 2010
                  • 132
                  #5
                  Re: Tenma 72-040 Cap Meter

                  mF = millifarad
                  uF = microfarad

                  1mF = 1,000uF

                  3.26mF = 3,260uF

                  Meter came with no book? It's usually explained or charted in the manual.
                  Last edited by Quasar; 09-28-2010, 09:28 PM.

                    Comment

                    • microtech
                      New Member
                      • Jan 2012
                      • 3
                      #6
                      Re: Tenma 72-040 Cap Meter

                      I have the manual--it's only a couple pages--ur welcome to it if u want.

                        Comment

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