----- Original Message -----
From: "Geoff Blake" <geoff@palaemon.co.uk>
To: <Amateur-repairs@yahoogroups.com>
Sent: Tuesday, November 13, 2012 11:42 AM
Subject: Re: [Amateur-repairs] An accurate test meter
> An antique but good device for measuring inductance (there
> is a
> capacitance measuring version too) was the Rhode and
> Schwarz LARU - a
> later version was the LART. I am not sure if there is a
> more modern
> version.....
>
> It works on the basis of a capacitor connected to the
> unknown and a
> device to check the self resonant frequency - it is rather
> like an
> accurate GDO. Obviously the capacitance version works by
> checking with
> a known inductor......
>
> I would imagine that a similar device should be easy to
> make...
>
> Geoff G8GNZ
>
If we are discussing small inductors or capacitors for
use at RF a Q-Meter is an ideal tool. Very small
capacitances can be measured by the substitution method. In
theory its also possible to measure equivalent series
resistance but usually the Q of small capacitors is so much
larger than the Q of the working coil that its masked.
My ancient Booonton 260-A will measure less than 1pf.
--
Richard Knoppow
Los Angeles
WB6KBL
dickburk@ix.netcom.com
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