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Old 09-28-2010, 01:54 PM   #1
Solder Boy
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Question 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!
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Old 09-28-2010, 02:05 PM   #2
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Default 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.
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Old 09-28-2010, 05:13 PM   #3
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Default 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.
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Old 09-28-2010, 05:19 PM   #4
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Default Re: Tenma 72-040 Cap Meter

Yes, 3260uf
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Old 09-28-2010, 09:24 PM   #5
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Default 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 at 09:28 PM..
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Old 02-15-2012, 08:06 PM   #6
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Default Re: Tenma 72-040 Cap Meter

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