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capacitor value?
#1
Hi all,
Another dumb question...
I just received an order of ceramic capacitors for the transmit board (C1, C2, C4, C5, C6, C9) which are supposed to be 100nf/50V. The marking on the capacitors is 104 which I understand to mean .1uf or 100nf or 100000pf (I think that's the correct number of zeros!). However, when I measure the capacitor with my meter I read about 46nf or about half the value I expect.

Is this normal/OK?

Cheers.
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#2
Hello,

The first two numbers are value, the third is a multiplier. 104 = 10 x 10(4) = 10(5) = 100 nF
(The numbers in parentheses should be small = exponent.)

   
Best Regards
Zdenek

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#3
(19-03-2019, 16:49)WetCoast Wrote: ...
The marking on the capacitors is 104 which I understand to mean .1uf or 100nf or 100000pf (I think that's the correct number of zeros!). However, when I measure the capacitor with my meter I read about 46nf or about half the value I expect.

Is this normal/OK?

You are right, 104 is the correct mark for a 100nF capacitor.
I believe that common capacity meters aren't able to give precise capacity readings, at least that is what happens with my capacity meter.
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#4
Sorry,

I didn't understand your question exactly ...  Blush

Indeed, some cheap measuring devices measure nonsense. But again, some surprise with their relative accuracy - such
as the picture - from China bought a relatively cheap Transistor Tester kit.
(The same capacity of 104 is always measured in the figures.)

         

   
Best Regards
Zdenek

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#5
That's why part of the WeatherDuino Labs are localized on Praha, Czech Republic. Smile Smile Smile
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#6
Thanks very much for your responses.
I will attribute the error to my meter, it isn't all that cheap (at least I didn't think it was) but it isn't really expensive either.
So I'll trust the markings on the caps and install them and not worry about it. Smile 

Thanks again.
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#7
(19-03-2019, 23:24)Werk_AG Wrote: That's why part of the WeatherDuino Labs are localized on Praha, Czech Republic.  Smile  Smile  

Big Grin Heart
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Zdenek

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#8
(20-03-2019, 02:54)WetCoast Wrote: I will attribute the error to my meter, it isn't all that cheap (at least I didn't think it was) but it isn't really expensive either.
So I'll trust the markings on the caps and install them and not worry about it. Smile 

On the contrary, I recommend never to label any designation and always measure each component in advance!  Blush
Best Regards
Zdenek

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#9
(20-03-2019, 02:54)WetCoast Wrote: Thanks very much for your responses.
I will attribute the error to my meter, it isn't all that cheap (at least I didn't think it was) but it isn't really expensive either.
So I'll trust the markings on the caps and install them and not worry about it. Smile 

Thanks again.

I think we can trust in the markings on the caps. Go ahead.
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#10
my readings. It's kind of hard to read the numbers on the capacitor but it says 104 and the meter reads 43.0 nF
Do you think this is a problem? or will I be OK using these capacitors for the TX board C1, C2, ETC?


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