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From: A E
X-Mailer: Mozilla 4.76 [en] (Windows NT 5.0; U)
Subject: Re: Meter movements
References: <3DD47F82.14E8608@videotron.ca> <3DD4C961.4C724848@earthlink.net> <3DD4EB16.B9EBDA04@videotron.ca> <3DD50467.2539F299@webaccess.net>
Date: Fri, 15 Nov 2002 13:30:22 -0500
NNTP-Posting-Date: Fri, 15 Nov 2002 13:28:40 EST
Chuck Simmons wrote:
> A E wrote:
> > Robert Baer wrote:
> > >
> > > I think that the basic idea comes from a VTVM; the input voltage is
> > > compared to a reference via a differential amplifier.
> > > The output is differential in nature, so that is wheer the meter goes.
> > > Very simplified explaination; have no idea as to what the 6284A does.
> > I guess it might have been nice to mention it's a current-limited DC supply,
> > with some analog 'remote control' features.
> > It goes from 0-24V and 0-3A. I have no schematics.
> > It just seemed so complex that I figured there has to be a reason. Maybe it
> > was designed by tube guy who squeezed transistors into tube topologies?
> Not really. For measuring voltage you want a very high resistance meter.
> 20,000 ohms per volt was considered good but higher is better. In
> measuring current, the idea is to measure a small voltage across a small
Yes, that makes sense. I guess in a lab supply, you want to remove all possible
sources of error.
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