Contact enhancers would probably make all the segments turn on because of
cross channel conductivity.
Could also cause the rubber in the Zebra stripes to break down in time if the
residue is the least bit oily (and most are, to act as an air barrier).

The impedances involved are so high, anything the least bit conductive will give
crosstalk. Be prepared to thoroughly clean off anything you apply if it
does mess up the display.

The long term problem with the displays may be inadequate clamping pressure.
It only takes a few mils error in thickness to go from manufacturer's spec
for pressure to 'too low to last'.

I had this problem (Z-sripe fatigue) with several Beckman DVM's back
in the 80's. Used a shim of paper under the plastic clamp to permanently
(more or less) fix the problem. That might be an option for the Fluke's
although the display clamp geometry is quite different.

Robert

Jim wrote:
>
> What would a touch of "Caig" contact enhancer
> do I wonder?
>
> RF Jim
>
> ----- Original Message -----
> From: "Randy Jones" <randyjones@WORLDNET.ATT.NET>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Saturday, August 10, 2002 8:07 PM
> Subject: Re: [EE]: Fluke meter LCD problem
>
> > Neil,
> >
> > I have a Fluke 87 DMM built somewhere around 1993 to 1995, and it
> > periodically needs repair for the same symptoms you described -- a gradual
> > "dimming" of the LCD display.  Maybe a better way to describe it is a loss
> > of contrast so that the numbers no longer appear different from the
> > background.
> >
> > A couple Fluke reps at a trade show immediately knew the problem (guess it
> > was common) and showed me what to do.  The meter must be disassembled to
> the
> > point where the LCD glass can be removed.  There are a couple rubbery
> > components that are apparently the (non-metallic) conductors to the LCD
> > glass.  I'm not familiar with the construction technology, but they need
> to
> > be cleaned, perhaps with a swab moistened with alcohol.  They may have
> used
> > a pencil eraser, I don't recall at this point.
> >
> > I just did mine a few minutes ago to prepare this response.    This is
> > probably the third time this repair has been needed.  The display had
> become
> > so faint that I haven't used it meter for some time.  I hope yours is the
> > same thing, and is as easy to perform as on the 87 (which is now working
> > fine once again).
> >
> > Best wishes,
> > Randy Jones
> >
> >
> > ----- Original Message -----
> > From: "Pic Dude" <picdude@PILOTTOOLS.COM>
> > To: <PICLIST@MITVMA.MIT.EDU>
> > Sent: Saturday, August 10, 2002 11:57 AM
> > Subject: [EE]: Fluke meter LCD problem
> >
> >
> > > Got a Fluke 8060A DMM here, that has had an LCD problem since it was
> > > new.  The LCD display is dim, and over time has dimmed more to the point
> > > where it's almost gone.  I used to be able to see enough to use it, and
> it
> > > worked well otherwise.
> > >
> > > Any thoughts on what might be wrong, or how to go about analyzing this?
> > > I'm hoping that it's just a display connector or something simple.
> > >
> > > Cheers,
> > > -Neil.
> > >
> > > --
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> > >
> >
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