[volt-nuts] Dekavider DV411 repair and question

[Hendrik Dietrich]

> Hendrik,
> I didn't catch that you were asking about the interconnecting wiring.  
> That is likely to be the same material as used to make the resistors 
> (Manganin). 
Sounds plausible.

> That would maintain the low tempco of the total unit, and avoid the 
> comparatively large resistance drifts of copper wire. 
As I wrote in my "If I understand right" message."
> Manganin is hard to solder without a flux that can remove the surface 
> oxide that forms on manganin wire.  Flux used for soldering stainless 
> steel might be a good one to try.  Just be sure to clean the joints 
> very well after using it.
>
Fortunately the previous owner kept the material when he modified it.
> The old ESI standards are very nice instruments to have.  I have an 
> old ESI decade capacitance box built like the Dekavider and Dekapot 
> units.  It's quite accurate; good enough to allow me to evaluate 
> RCL-type multimeters.
>
Besides that Dekavider which was part of a power supply i have a also 
recently ebayed SR1010 that was the cheapest to get and needed some TLC 
but the 34401A at work is not really a good instrument to check it, and 
i have my "noble thing" a Dekavider RV722 which I use quite frequently 
for ratio measurements, simply considering it ok for me as i was not yet 
able to show any problems with it (HP3456A and 34401A in ratio mode are 
both happy.)


> Cheers,
> Dave M
>
Cheers

Hendrik