[volt-nuts] Sn10Pb90

[Joseph Gray]

Volker,

I came across a couple of old Fluke differential voltmeters that need some
work. I thought it would be best to use low thermal EMF solder on these.

Joe Gray
W5JG



On Mon, Aug 12, 2013 at 10:39 AM, Volker Esper <ailer2 at t-online.de> wrote:

>
> Sorry, Joe, if my question was mistakable. I wanted to know your
> application. Maybe I'd recommend not using a special solder alloy rather
> than going the long way of aquiring it.
>
> I give you an example: When fixing a 6.5 digit DMM (HP34401A) I wasn't
> sure if I might use a special alloy to solder the pins of an input relay.
> In the end I did not. Comparing this fixed unit to a second one in several
> automated 24 hours tests with varying room temperatures, there seem to be
> no measurable differences between the two. So in this case it appears to be
> of no great importance using a special solder.
>
> Enthough the thermoelectric voltages at these pins are not negligible and
> therefore have to be considered, other effects obviously are of much more
> effect. So, as I mentioned, using a special soldering alloy drops in the
> priority list.
>
> Now, that I'm curious, please let us know, what you are using the solder
> for.
>
> Volker
> DF9PL
>
>
> Am 12.08.2013 15:06, schrieb Joseph Gray:
>
>> As I asked in my original message, I'm trying to find out where I can buy
>> a
>> small quantity of rosin-core 10/90 (tin/lead) solder. I don't want to buy
>> it in bar form from China.
>>
>> Joe Gray
>> W5JG
>>
>>
>>
>> On Mon, Aug 12, 2013 at 3:17 AM, Volker Esper<ailer2 at t-online.de>  wrote:
>>
>>
>>
>>> sorry, spelling mistake:
>>> "What do you _want_ it for?"
>>>
>>> Remember, those solder alloys are optimized for a specific alloy
>>> combination only, e.g. Cu-Cu.
>>>
>>> Volker
>>>
>>>
>>> Am 12.08.2013 10:39, schrieb Volker Esper:
>>>
>>>
>>>
>>>
>>>> Hi Joe,
>>>>
>>>> What are you looking for, Cadmium-Solder, or Sn10Pb90, which is
>>>> Stannum/Plumbum-only?
>>>>
>>>> And what do you what it for? In (very high) precision applications there
>>>> are so many issues to consider that the solder doesn't appear to be at a
>>>> high priority...
>>>>
>>>> Volker
>>>>
>>>>
>>>> Am 12.08.2013 00:38, schrieb Joseph Gray:
>>>>
>>>>
>>>>
>>>>> Reading through the archives, I saw that there was some discussion
>>>>> about
>>>>> a
>>>>> safer alternative to cadmium-based solder. The low tin, high lead alloy
>>>>> was
>>>>> recommended as a good low-thermal EMF substitute. However, I did not
>>>>> see
>>>>> any recommendations on where to buy some of this.
>>>>>
>>>>> I just did some searching and all I come up with is bar solder, mostly
>>>>> from
>>>>> China. Where can I buy a small quantity of rosin-core 10/90 solder?
>>>>> Mouser,
>>>>> which is my preferred vendor certainly didn't list any. I would think
>>>>> that
>>>>> even 1/2  pound would last me a lifetime.
>>>>>
>>>>> Joe Gray
>>>>> W5JG
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