[volt-nuts] Solartron 7075 reference heater and serial interface

[Fabio Eboli]

For the record, and if anyone is interested,
the oven heater is a ptc, 100ohm at ambient temp.
and about 420ohm at working temp.
The temperature seem to be something around 80°C

here more details:
http://preview.tinyurl.com/cy764vt

Fabio.

Fabio Eboli <FabioEb at quipo.it> ha scritto:

> Chuck, from the damages, the instrument seem to have
> been subject to acceleration ( e.g. a fall) or hard vibrations.
> I'm curious if the 100 ohm value is correct or the
> heater is damaged.
>
> In this post, Mickle T. linked an image of the
> diode oven:
> http://www.radiokot.ru/forum/viewtopic.php?f=10&t=52829&start=60
> This is the reference opened:
> http://i011.radikal.ru/1202/04/76affad54e2c.jpg
> So you imagined it correctly.
> I'm also curious if the oven is a fixed resistance or a PTC,
> I forgot to test for this when I had the multimeter opened.
>
> Fabio.
>
> Chuck Harris <cfharris at erols.com> ha scritto:
>
>> Looks to me like the oven is simply a black plastic box,
>> that holds a 100 ohm resistor and a zener diode, that is
>> filled with silicone rubber.
>>
>> -Chuck Harris
>>
>> Fabio Eboli wrote:
>>> Hello, I recently repaired an old 7075, the reference oven seem opened and
>>> leacky, with what seems silicone getting out. I measured the  
>>> heater resistance and
>>> is of about 100ohm. Is this normal? Here some photos and more details about
>>> serial interface
>>>
>>> http://www.eevblog.com/forum/product-reviews-photos-and-discussion/solartron-7075-(or-will-i-be-able-to-reassemble-it-)/
>>>
>>>
>>>
>>> I'm thinking to connect a micro to the internal optoisolated  
>>> interconnection to
>>> bring out the readings, should be interesting to log the glug  
>>> signals stats.
>>>
>>> Fabio.
>>>
>>>
>>>
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