On Mon, 05 Jan 2009 07:15:47 -0500, John Bachman
put finger to keyboard and composed:

On Sun, 04 Jan 2009 15:09:06 -0500, Fred McKenzie
wrote:

In article ,
John Bachman wrote:

The Capacitor Wizard uses a 100Khz sinusoidal signal. The Bob Parker
design is as described - that is what is used in our Blue ESR meter.
Bob always represented that his method is the equivalent of a 100Khz
signal.

John-

I built one of your Blue ESR meter kits and am impressed with it.

Somewhere I read that there is an industry specification or common
practice, that requires ESR measurement to be made at 100 KHz. If it is
in fact a "standard" method, you should petition that standards
committee to agree that your method is equivalent.

I have not heard of any such industry specification but will
investigate and report back to this group.

Does anyone else have any insight into this?

John
AnaTek Corporation
The Blue ESR kit at www.anatekcorp.com/blueesr.htm

I don't have any insight, but I see that Vishay's datasheets specify
100kHz as the ESR testing frequency for 292D Solid Tantalum Chip
Capacitors:
http://www.vishay.com/docs/40042/40042.pdf

OTOH, Vishay Roederstein EKA/EKB series Aluminum Capacitors are
specified using a "calculated" ESR at 120Hz:
http://www.gudeco.de/de/aktuelles/do...-2007_rev0.pdf

There are some surprising results including an ESR of 121 ohms for a
2.2uF 450V cap.

- Franc Zabkar
--
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