[volt-nuts] Solartron 7061 ROM and behaviour questions (washelp request (eeprom?))

Fabio Eboli FabioEb at quipo.it
Fri Mar 23 21:59:10 UTC 2012

Thank you Mikle.
I tried to read your post usign google translator,
as far as I understand it a *very* interesting article,
if you have time you should translate it.
If I understand correctly the firmware corrects for
temperature using a temperature sensor near the reference,
and a parabolic model.
The drift correction the instrument performs about
every 15minutes should be just this?
You mention the SZA263, some time ago I searched info about it
but no luck, (I have one here in a fluke 8520, that has
a mean time to fail of few hours :).
Also you show a solartron 7075 disassembled reference,
this evening I was just contemplating this exact component
(I was disassembling and cleaning a 7075, I'll show
some pics on this post:
http://www.eevblog.com/forum/product-reviews-photos-and-discussion/solartron-7075-(or-will-i-be-able-to-reassemble-it-)/ )  
saved me from the tentation to disassemble it.
If I understand correctly the 7061 has not the DAC but
the thermal compensation cal is made by hand closing some
solder bridges.
Now I don't have much time and I'm waiting another programmer,
in future I'll try to understand better the 7061, as far as my knowlede


7061 manual: very interesting but a little pricey, this hobby
is becoming dangerous for my wallet :)

?????? <timka2k at yandex.ru> ha scritto:

> Hi, Fabio!
> Zener TC correction in the 7061 and 7071/7081 is very simple.  
> Recently I wrote a
> small article about TC correction methods in precision DMMs and calibrators:
> http://www.radiokot.ru/forum/viewtopic.php?f=10&t=52829&start=60  
> (sorry, but in
> Russian). It is possible to achieve 0.1 ppm/C temperature drift by  
> choosing the
> proper coefficients of the quadratic function. But 7061 maintenance manual -
> it's amazing!
> Mickle T.
> Friday, March 23, 2012, 4:23:57 PM, you wrote:
> FE> Finally the manual saga ended :
> FE> today the 7061 maintenance manual arrived,
> FE> it's photocopied (or laser printed maybe),
> FE> very clean and readable.
> FE> I had only the time to read superficially,
> FE> but I liked the description of temperature
> FE> compensaiton for the reference diode,
> FE> now I only need a controlled climatic chamber
> FE> to play with :)
> FE> I received as bonus a 7075 operator manual
> FE> original (not photocopied), it will be
> FE> nice companion to the 7075 that I received
> FE> recently.
> FE> Fabio.
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