[volt-nuts] cadmium solder alloy for low thermal emf?

[Volker Esper]

By the way: does anyone know, if Agilent uses special solder alloy? I've 
heard that a cadmium containing solder is used to get extremely low 
thermoelectric voltages (or voltage differences).

Is that right? If so, which alloy has to be used?

Thanks

Volker


Am 30.05.2013 03:29, schrieb Volker Esper:
>
> Thank you for your suggestions.
>
> Yes, I tried to identify the connection that is faulty. Though I 
> mistrusted all mechanical contacts (relays and front/rear switch), my 
> greatest fear was, that one of the PLCCs would be defective...
>
> I opened the case and shortened all the closed contacts with an 
> extremly low ohms short and the display changed significantly when 
> coming to K101. Today I screwed up my courage and soldered a short 
> wire across the contacts of this high voltage relay. It's been running 
> for 12h now, without any wrong value.
>
> So I've got to get one of those relays - Agilent says "orderable" at 
> about 40 Euro. That's quite fair, I think.
>
> Thanks so far
>
> Volker
>
>
> Am 21.05.2013 17:39, schrieb Don at True-Cal:
>> Volker,
>>
>> I agree with the assessment that Frank gave you, that one or several 
>> high
>> resistance connections between the terminals you are using and the
>> connection to the main circuit board are at fault. This path would 
>> include
>> the front/back switch itself and any low EMF slip-on connectors between
>> front/back terminals and switch as well as from switch to main board. 4W
>> measurements can correct for this increasing and varying path 
>> resistance but
>> 2W measurements can't. I have seen this behavior in the 34401A and 
>> even the
>> 3458A as well. It's an easy fix. You can probably find the offending
>> connection by wiggling each while watching the 2W reading with a 
>> short on
>> the terminals. If you see the problem on both front and rear 
>> terminals, the
>> fault is between the switch and main board. If only on front OR rear, 
>> the
>> fault is between that set of terminals and the switch. You will want to
>> clean ALL connectors on both Input and Sense while you are inside.
>>
>> Hope this helps...
>> Don @ True-Cal
>>
>>
>> -----Original Message-----
>> From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On
>> Behalf Of Frank Stellmach
>> Sent: Tuesday, May 21, 2013 12:53 AM
>> To: volt-nuts at febo.com
>> Subject: [volt-nuts] Volt Nuts Rookie
>>
>> Hello Volker,
>>
>> welcome here.
>>
>> Currently, my 34401A shows a similar behaviour, on the rear 
>> connectors only.
>>
>> 2W Ohm there drifts up and down, several 10 digits in 6 digit mode, 
>> whereas
>> the measurement is stable on the front connectors.
>> 4W Ohm is stable even on rear connectors.
>>
>> Obviously, the front/rear switch is oxydized, or otherwise faulty.
>>
>> Please, check the measurement on the rear connectors also.
>>
>> Regards Frank
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>
>
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