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From: Fred Bloggs
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Subject: Re: Cheap low frequency impedance bridge?
References: <3DA6E7D6.email@example.com> <firstname.lastname@example.org>
Date: Sat, 12 Oct 2002 16:27:20 GMT
NNTP-Posting-Date: Sat, 12 Oct 2002 09:27:20 PDT
Organization: EarthLink Inc. -- http://www.EarthLink.net
Bill Sloman wrote:
> The Analog Devices AD9854 DDS chip that produces tightly coupled
> in-phase and quadrature outputs
> is exactly what I'd love to be able to use - much neater (though
> probably no more effective) than the scheme Win Hill set around two AD
> DDS chips.
I cannot believe that you require ppm accuracy in measurement of a
parameter, indicative of wearout, that deviates over a 10:1 range. If
you can adjust the frequency to 200KHz for measurement of R with
adequate accuracy, then you certainly have the bandwidth for measuring
the time constant of a step response. Why isn't this good enough?
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