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From: firstname.lastname@example.org (Bill Sloman)
Subject: Re: Cheap low frequency impedance bridge?
Date: 13 Oct 2002 12:06:18 -0700
References: <email@example.com> <firstname.lastname@example.org> <email@example.com>
NNTP-Posting-Date: 13 Oct 2002 19:06:18 GMT
Tony Williams wrote in message news:<firstname.lastname@example.org>...
> In article <email@example.com>,
> Bill Sloman wrote:
> > Well, we don't have a problem at the 10k/100uF/200kHz end of the
> > range, and while I've still got 100uF, I don't have a problem at 10R
> > either. What I need to do is get the frequency down to 150Hz so I've
> > got 45 degrees of phase shift and can measure the 100uF *precisely*,
> > and see any small progressive erosion in the capacitance long before
> > it starts giving me trouble where I'm actually measuring the 10R, and
> > maybe predict the service life of the gadget within a period
> > substantially shorter than the service life.
> TTi LCR400 (Farnell 351-0906) looks like it might
> be worth looking at.... at GBP595-00.
Thanks Tony. It certainly looks interesting. The three test
frequencies - 100Hz, 1kHz and 10kHz - might be enough for our
purposes, but the data I could pull of their web site doesn't specify
the excitation level, and we want to keep that to about 5mV rms. I'll
e-mail a query from work tomorrow.
The Thurlby-Thandar stuff does offer good value for money. We've
alread got their 5.5 digit multimeter. They seem to have acquired
Clive Sinclairs knack of minimising the cost of providing a function,
without getting stuck with his insistence on using the cheapest
possible components. As far as I know he was involved in the start-up,
but isolated from production once they started shipping products.
Bill Sloman, Nijmegen
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