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> Date: Sun, 23 Nov 2014 12:51:32 -0700
> From: [email protected]
> To: [email protected]
> Subject: Re: [volt-nuts] Completion of LED Mod's for the Fluke 845AB & 845AR
> Null Meter.
>
> Dallas,
>
> I have a noisy 845AR, so I am keenly interested in your modifications.
>
> Thank you,
> Joe Hobart
> Flagstaff, Arizona
>
>
> On 11/23/2014 11:29 AM, Dallas Smith wrote:
> > To All,
> >
> > The final modification of the Fluke null meters with LED's is completed. The
> > results is impressive, keeping the basic original circuit of the meters. My
> > rev
> > 8 AR version has a double diode in the output stage which seems to remove
> > the
> > zeroing hysteresis around a zero reading was also made to my 845AB.
> > Implementing
> > two 1.2v reference diodes in the zeroing circuit greatly improved the zero
> > drift
> > for the zeroing control. There were also changes to the feedback response by
> > changing two capacitors. If anyone is interested, please E-mail me at my
> > personal address.
> >
> > [email protected]
> >
> > Dallas
> >
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