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From: firstname.lastname@example.org (Bill Sloman)
Subject: Re: Cheap low frequency impedance bridge?
Date: 17 Oct 2002 14:28:29 -0700
References: <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com>
NNTP-Posting-Date: 17 Oct 2002 21:28:29 GMT
Tony Williams wrote in message news:<firstname.lastname@example.org>...
> In article <email@example.com>,
> Bill Sloman wrote:
> > Tony Williams wrote;
> > > TTi LCR400 (Farnell 351-0906) looks like it might
> > > be worth looking at.... at GBP595-00.
> > Thanks Tony. It certainly looks interesting.
> It does look tasty. Since you seem to be into
> making your own sensors this would be a useful
> instrument to have generally. Did you clock the
> 0.1 milliohm resolution?
I was more interested in the 0.1% accuracy, which offers some
incidental advantages - we may be able to use the beast to calibrate
our sensors directly, rather than calibrating the system as a whole.
I had to ring Thurlby-Thandar to get the excitation voltage - they
didn't respond to my e-mail - and at 30mVrms it is more than I would
have liked, but less than the 50mV rms "low" level from the HP 4276
that Win recommends.
The HP 4276 is also less accurate, at around 0.2%, but it does offer
801 different frequencies in the range 100Hz to 20kHz, which I would
have liked, but when it came down to the wire, the boss was prepared
to okay the Thurlby Thandar LCR400 - because we'd be getting a
brand-new instrument from a local supplier, and could send it back
fast if it didn't work, whereas John Dau's HP-4276 is second-hand and
would have had to go back to California if it hadn't work.
Win's endorsement of John Dau carries a fair bit of weight with me,
but the boss was not persuaded - it wasn't as if the HP 4276 was
demonstrably worth the extra risk. An HP 4274 would have been
appreciably more attractive, and the current generation of Agilent
impedance bridges more attractive still, but they are much too
expensive for our budget.
Bill Sloman, Nijmegen
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