[volt-nuts] Completion of LED Mod's for the Fluke 845AB & 845AR Null Meter.
dosmith at outlook.com
Sun Nov 23 20:11:28 EST 2014
Please send me an email so I can put you in my special
address book for the info.
> Date: Sun, 23 Nov 2014 12:51:32 -0700
> From: nova at npgcable.com
> To: volt-nuts at febo.com
> Subject: Re: [volt-nuts] Completion of LED Mod's for the Fluke 845AB & 845AR Null Meter.
> 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.
> > dosmith at outlook.com
> > Dallas
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