[volt-nuts] Capacitor measurement
jfor at quik.com
Tue Mar 16 22:35:50 UTC 2010
Absolutely no surprise at all. Audiophoolery is rife with scams from A to
Z. It has been so for at least 40 years.
The ONLY real thing is that crap costs FAR more than it's worth.
> Speaking of capacitor measurement... I am building a capacitive discharge
> spot welder/cutter similar to the ones at
> http://ultrakeet.com/index.php?id=article&name=cdWelder_p2 and
> I went down to the local electronics emporium and bought a 1.5 farad 0.002
> ohms ESR car audio cap, took it home, and did some measuring. Turns
> out the capacitance was 0.15F and the esr was .026 ohms. A second sample
> had the same value (ESR was .0065 ohms). Utter ripoff! Also the
> capacitor can was about 1/3 empty.
> I also tested some heavy gauge car audio cables for the store owner.
> BEWARE, some of the audio cable suppliers are up to similar shenanigans.
> A 4 AWG cable that looked like copper was plated aluminum (1.5 times the
> resistance of copper). 8 and 10 AWG cables were some mystery metal... 3
> times the resistance of copper (but not magnetic). All were made in China
> (as were the caps).
> One bright spot was a piece of Made in the USA pure oxygen free copper 10
> AWG cable. It measured over 20% better conductance than one would expect
> from pure copper! Looks like it is a little fatter than 10 AWG. Two
> strands of that 10 AWG wire has less resistance than the 4 AWG aluminium
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