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

Fabio Eboli FabioEb at quipo.it
Fri Apr 6 16:56:10 UTC 2012


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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