[volt-nuts] Keithley 2182A

[Russ Ramirez]

Looking forward to your notes Todd. A bit more info on the repair.

DCV1 is OK except for the 10 V range. A test voltage input of 100 mV
appears on the input side of Q665 fine, but not on the output side in the
10 V range, however a DMM measurement is solid in the other applicable
ranges. So this issue does seem to be completely isolated to the 10 V range.

DCV2 input is fine through the path to the ADC (TP652) in all ranges, but
the unit is not making a stable measurement. For example, a 9 V input reads
between 8.8 V and 9.2 V on the 10 V scale. The same 9 V input to DCV1 also
looks good up to TP652, on the 100 V range since 10 v is out it, and it
reads a stable 9.002 V at that TP. Without a schematic, it will take some
time to determine what is different after the TP652 point - maybe there are
in fact 2 ADCs, but it's not obvious either way.

Russ

On Sun, Jun 26, 2016 at 11:16 AM, Todd Micallef <tmicallef at gmail.com> wrote:

> I have to review my notes, but I know of the two bad parts that were
> found, one was the TF-245. I happened to have a spare on hand. I will look
> through any notes to get the other part number.
>
> Todd
>
> Sent from my iPad
>
> > On Jun 26, 2016, at 10:09, Russ Ramirez <russ.ramirez at gmail.com> wrote:
> >
> > Thanks Illya - very nice piece of work!
> >
> > Russ
> >
> >> On Sun, Jun 26, 2016 at 5:27 AM, Illya Tsemenko <illya at xdevs.com>
> wrote:
> >>
> >> If you looking into repair or internals detail of 2182, this draft
> article
> >> may help: https://xdevs.com/fix/kei2182/
> >> Keithley stopped releasing schematics and detailed information since
> >> xxxx-series instruments due to IP issues.
> >>
> >> 26/06/16 18:08, Brian Smith пишет:
> >>
> >> Hello Russ
> >>>
> >>> It appears that there are neither a service manual nor a schematic
> >>> available anywhere.
> >>>
> >>> My educated guess is that this is because the 2182A is a current model
> >>> instrument. The newest production model keithley gear does not have
> >>> associated service manuals nor schematics published. These appear to be
> >>> treated as trade secrets.
> >>>
> >>> You can have your 2182A serviced by Keithley if it is in need of
> repair.
> >>>
> >>> I had my model 2000 DMM that I bought from eBay serviced by Keihtley
> for
> >>> $560. They replaced the motherboard bringing the DMM up to brand new
> >>> condition. I asked for and received the calibration data with the
> returned
> >>> instrument.
> >>>
> >>> best regards,
> >>>
> >>> Brian
> >>>
> >>>
> >>>
> >>> On Fri, Jun 24, 2016 at 10:38 PM, Russ Ramirez <russ.ramirez at gmail.com
> >
> >>> wrote:
> >>>
> >>> The service manual, or a schematic. I asked just in case someone had
> one
> >>>> from an original purchase. I also asked a friend who worked for
> Keithley,
> >>>> but apparently no one he knew had one either. Hard to find.
> >>>>
> >>>> Russ
> >>>> On Jun 24, 2016 6:26 PM, "Brian Smith" <briansmith23456 at gmail.com>
> >>>> wrote:
> >>>>
> >>>> What document do you need? Keithley publishes most needed docs.
> >>>>> On Jun 24, 2016 12:59 PM, "Russ Ramirez" <russ.ramirez at gmail.com>
> >>>>> wrote:
> >>>>>
> >>>>> Just wondering if any of you might have a PDF of the subject
> >>>>>>
> >>>>> Nanovoltmeter?
> >>>>>
> >>>>>> TIA
> >>>>>>
> >>>>>> Russ
> >>>>>> _______________________________________________
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> >>
> >>
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