I do not imagine cadmium bearing solder being easy to acquire. The Wikipedia entry for solder says Pb90Sn10 can be used as a replacement for Cd70Sn30 in low thermal EMF applications:
http://en.wikipedia.org/wiki/Solder On Thu, 30 May 2013 04:00:19 +0200, Volker Esper <[email protected]> wrote: > >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@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: [email protected] [mailto:[email protected]] On >>> Behalf Of Frank Stellmach >>> Sent: Tuesday, May 21, 2013 12:53 AM >>> To: [email protected] >>> 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 >>> _______________________________________________ >>> volt-nuts mailing list -- [email protected] To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >>> and follow the instructions there. >>> >>> _______________________________________________ >>> volt-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >>> and follow the instructions there. >>> >>> >> >> >> _______________________________________________ >> volt-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >> and follow the instructions there. >> >> > > >_______________________________________________ >volt-nuts mailing list -- [email protected] >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >and follow the instructions there. _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
