[volt-nuts] Desperately seeking OPTION 10 for Datron 4708

[Todd Micallef]

I don't have access to the schematics right now. For the DC section, I
would think that the selected reference array would be the only difference.
The firmware will dictate the model.

I have not compared the option 10 board in the 4700 to the 4000A but I
think there will be little difference there too. I cannot remember if I
have the 4000A schematics but I think they are online.

I think the resistance/shunt board would be the same. There were slight
differences in specs but I don't think they made any layout changes that
couldn't be modified.

I have an old 4000A waiting for me to repair it. I have looked at the
resistance/shunt board and I can tell that there are some bodges to the
trim pots. I have not measured any of the affected resistors, but I am
guessing they have drifted out of the trimmable range since additional
resistors were added to the board.



Todd


On Wed, Jul 16, 2014 at 2:38 PM, Tom Knox <actast at hotmail.com> wrote:

> I wonder if the tolerances are different on option 10 boards in the
> series? If so it could makes the board much easier to find. The service
> manuals would confirm interchangeability if the part numbers are the same,
> but even if the 4708 uses selected parts, most components stability improve
> with age and so if the topography is the same you should be good to go.
>
> Thomas Knox
>
>
> Luck is preparation waiting to happen.
>
> > From: tmicallef at gmail.com
> > Date: Wed, 16 Jul 2014 10:29:43 -0400
> > To: volt-nuts at febo.com
> > Subject: Re: [volt-nuts] Desperately seeking OPTION 10 for Datron 4708
> >
> > Chris,
> >
> > I believe the current and resistance functions are on the same board. My
> 4700 is missing one board and it has both missing features.
> >
> > Todd
> >
> > Sent from my iPad
> >
> > > On Jul 16, 2014, at 8:48, Chris <caall99 at gmail.com> wrote:
> > >
> > > Thank you for the bad news :( I am starting to come to terms with the
> > > difficulty of finding this option. I have recently discovered that
> option
> > > 10 from the 4700, 4705, and 4707 would also work. Not sure if this
> makes it
> > > any easier.
> > >
> > > Also my unit has a sticker on the front indicating "ac voltage and
> current
> > > only"... But lists options 20,30,80,90 on the backside label. Will my
> unit
> > > have resistance functionality? I am hearing a lot of conflicting
> > > information.
> > >
> > > Not sure if I am replying to emails correctly. (New to volt nuts)
> > >> On Jul 12, 2014 6:03 PM, "Chris" <caall99 at gmail.com> wrote:
> > >>
> > >> Nobody has access to spare Datron 4708 stuff? I am willing to pay
> > >> international shipping etc... whatever it takes! Thank you
> > >>
> > >>
> > >>> On Thu, Jul 10, 2014 at 2:09 PM, Chris <caall99 at gmail.com> wrote:
> > >>>
> > >>> I am looking to purchase OPTION 10 slide in board for the Datron 4708
> > >>> Multifunction Calibrator. If anybody has a parted out unit and can
> sell me
> > >>> just the option 10 board i would appreciate it dearly! Thank you for
> > >>> considering!
> > >>>
> > >>> Chris
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