Who needs professional accuracy? Most aluminium electrolytics have a tolerance on -50/+100% so your 100uf could be between 50uf and 200uf.
For 90% of testing I have a cheap Arduino based tester like the one reviewed here:-
I must say its magic. Stuff must anything in and you get a result. Sometimes it syas its broken, and usually it is.
No good for caps over 100uf but I have other ways to measure them.
Dave
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-----Original Message-----
From: LTspice@... [mailto:LTspice@...]
Sent: 02 August 2015 10:44
To: LTspice@...
Subject: Re: [LTspice] OT: who has access to a professional capacimeter?
I almost always make a circuit
that somehow relate the signals back to the accuracy of a resistor. Use an
'active' circuit to win twice. A generator, KNOWN resistor [1%] KNOWN
frequency(s), measure RELATIVE voltage readings: Vac1=input and
Vac2=voltage across cap. Then make certain the multiple values you get
make sense
No Function Generator? Use your SoundCard. it is accurate. No scope? Use
your SoundCard
check whether Daqarta will work for you:
Bob Masta
DAQARTA v7.60
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter Frequency Counter,
Pitch Track, Pitch-to-MIDI
FREE Signal Generator, DaqMusiq generator
Science with your sound card!
No need to 'buy' anything. Nor, end up trusting an instrument whose
accuracy cannot be verified easily
regards
robert
--- LTspice@... wrote:
From: "zio_bapu@... [LTspice]" <LTspice@...>
To: <LTspice@...>
Subject: [LTspice] OT: who has access to a professional capacimeter?
Date: 02 Aug 2015 02:22:21 -0700
OT: who has access to a professional capacimeter?
Sorry to be OT, I write here because 'more' likely we are professional
electronics.
Wonder if anyone can 'make me a great pleasure, I will send by mail a
capacitor 100 / 1000uF him fit me with a capacimeter value professional and
informs me by e-mail, no need to send it back.
My problem:
I am an electronic Hobbyist and economic use meters, but each one
measuring capacitor shows me a very different value (also 20%).
I homebuilt a capacimeter from 100.000uF and need a capacity 'of known
value to calibrate it.
I tried to measure a capacitor with a bridge RLC but the frequencies of 10-
100-1000Hz shows me three completely different values.
Someone and 'willing to do this to me please?
I live in Italy, please contact me at my email: "bertolimarco2004 snail libero.it"
Thanks in advance.
Marco
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Posted by: Macy <macy@...>
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