[time-nuts] Heated crystal? & Rb tube corrosion (FE-5680A)

WB6BNQ wb6bnq at cox.net
Thu Dec 1 03:25:40 EST 2011


Steve,

I viewed not just the picture you referenced but all of the pictures at that site
and was unable to detect ANY corrosion of any kind.  What you are seeing are
scratch marks in the anodized plating due to having the Rb removed from heavily
plated circuit board that is used as a heat sink for the Rb.  At one end of the
physic package is a circular shaped housing which has some rosin left on it, a
thermistor or two attached and some kind of bonding material used for mounting
the heating transistors that has changed color because that part is heated when
it is running; that is not corrosion.  The screws attaching that item to the rest
of the physic package have fiberous material for a mounting washer to buffer
vibration or are used as insulators; that is not corrosion.  The screws that are
holding down the circuit board press down on a gold plated circular area used for
grounding besides being used for a mounting point; that is not corrosion.

I think you need to reboot "your" internal operating system and then do a serious
update on your help files.

Bill....WB6BNQ


"Steve ." wrote:

> Bill,
>
> I was starting to think i may have to crack open an instrument to get a
> picture. But i found a reference online.
> http://n1.taur.dk/fe5680a-2/IMG_1375.JPG
>
> Note the corrosion around the cheaper metal parts (screws, spacers, shell).
> I can't speak for the FE-5680A, but when i see something like this in the
> instruments i maintain it's a tale-tale sign gas mitigation.
>
> Steve
>
> On Thu, Dec 1, 2011 at 12:16 AM, WB6BNQ <wb6bnq at cox.net> wrote:
>
> > HUH ?
> >
> > What, exactly, do you mean by "corroded Rb tube interfaces ?"
> >
> > bILL....wb6bnq
> >
> >
> > "Steve ." wrote:
> >
> > > snip
> > >
> > > Also It appears that quite a few of
> > > these have corroded Rb tube interfaces.
> > >
> > > Thanks,
> > > Steve
> >
> >
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