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From: Winfield Hill
Subject: Re: Cheap low frequency impedance bridge?
Date: 17 Oct 2002 15:03:17 -0700
Organization: Rowland Institute
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> 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.
You need a grown up LCR meter, like my HP4275A. This has adjustable
excitation in three ranges from 0.01V to 1V. On the lowest range I
turned the control pot down to 0.1, the excitation voltmeter read 1mV
but the capacitance reading didn't change at all. Nice. I then turned
the excitation control pot to zero and the meter read 0.000V, yet the
4275A still gave the correct cap reading. Now that's impressive :-)
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