[volt-nuts] Completion of LED Mod's for the Fluke 845AB & 845AR Null Meter.

Dallas Smith dosmith at outlook.com
Sun Nov 23 23:25:33 EST 2014


Thank you Todd 

Dallas

> Date: Sun, 23 Nov 2014 23:13:11 -0500
> From: tmicallef at gmail.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 uploaded the mod file to the ko4bb ftp server. I could not find the
> AR or AB manuals so I also added them. Right now they are sitting in the
> Recent Uploads directory.
> 
> 
> Todd
> 
> On Sun, Nov 23, 2014 at 10:31 PM, Dallas Smith <dosmith at outlook.com> wrote:
> 
> > Thank you, that will be fine. I'm getting swamped with request. could you
> > start a volt-nuts thead to its location?
> >
> > > Date: Sun, 23 Nov 2014 22:20:17 -0500
> > > From: tmicallef at gmail.com
> > > To: volt-nuts at febo.com
> > > Subject: Re: [volt-nuts] Completion of LED Mod's for the Fluke 845AB &
> > 845AR Null Meter.
> > >
> > > Dallas,
> > >
> > > Thanks for the information.
> > >
> > > Would you be opposed to uploading it to the KO4BB website? I think Didier
> > > could place it in a Fluke 845AB/AR folder. I could upload it with a copy
> > of
> > > the manuals and send him an email.
> > >
> > > Todd
> > >
> > > On Sun, Nov 23, 2014 at 10:02 PM, Dallas Smith <dosmith at outlook.com>
> > wrote:
> > >
> > > > How do I make my RTF attachment available to Volt-nuts? I do not trust
> > > > cloud servers and the like.
> > > >
> > > > Dallas
> > > >
> > > >
> > > > On 11/23/2014 1:29 PM, 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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> > > >>
> > > >>
> > > >>
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