In Reply to: Ok, so can you explain how these thermal effects might manifest themselves? posted by Commuteman on August 23, 2003 at 17:29:51:
I'm not looking for temperature variations across the rig..In fact, I'm trying to eliminate them in my IA setup, as metal films are 50 ppm/C.What I'm talking about is the non linear conversion of currents into heat flow..At audio frequencies, that heat flow will be unable to travel fast enough to modulate the surface temperature..But, the conversion process is still fast enough to react to an audio signal.
What I'm proposing is to measure the I/V characteristics of 1000 back to back solder joints, copper to tin/silver (only have a pot filled with that, not tin/lead.
The non linearity should be visible in the dc realm..If so, it should also affect ac. I figure 1000 joints should be enough that if there is an effect, it'll slap me upside the head.. If not, then an upper limit for that possibility could be established, something on the order of "not greater than 1 uVolt per joint", my rough estimate for dc simple measurements.
""So we've had the usual pseudo-technical pissing match.""Peter
Do not confuse what has been transpiring here as a technical anything. Regardless of how technical I have tried to keep it, it's not possible to have a one sided technical discussion.
If 1k joints have a 1 millivolt effect, JC's rig would see hash across the spectrum at levels totally unmistakable. Or, it may be that there is no effect...time will tell..
Cheers, John
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Follow Ups
- Re: Ok, so can you explain how these thermal effects might manifest themselves? - jneutron 12:54:34 08/24/03 (26)
- Re: Ok, so can you explain how these thermal effects might manifest themselves? - john curl 15:37:42 08/24/03 (25)
- Re: Ok, so can you explain how these thermal effects might manifest themselves? - jneutron 07:59:53 08/25/03 (24)
- Can you stop arguing with JC and describe what you think might be happening? - Commuteman 09:09:25 08/25/03 (8)
- Who's arguing? I'm being bashed for trying to explain. - jneutron 11:21:13 08/25/03 (7)
- Are you sure you can use this Seebeck/Peltier cause and effect model? - Commuteman 12:18:56 08/25/03 (6)
- I forgot to add.. - jneutron 17:20:41 08/25/03 (0)
- I'll stick to this thread. - jneutron 12:31:19 08/25/03 (4)
- Can we get to some ballpark numbers to see if it's significant? - Commuteman 13:41:47 08/25/03 (3)
- You're killin me... - jneutron 15:56:18 08/25/03 (2)
- I think we're using the same numbers.. - Commuteman 17:28:12 08/25/03 (1)
- AHA!!!!! So that's where the error is... - jneutron 17:46:53 08/25/03 (0)
- Re: Ok, so can you explain how these thermal effects might manifest themselves? - john curl 08:50:17 08/25/03 (14)
- JC..you really have to read the posts.... - jneutron 10:29:16 08/25/03 (13)
- Re: JC..you really have to read the posts.... - john curl 13:36:44 08/25/03 (10)
- Hi John - jneutron 15:21:15 08/25/03 (9)
- Re: Hi John - john curl 16:47:15 08/25/03 (8)
- Re: Hi John - jneutron 17:04:43 08/25/03 (7)
- Re: Hi John - john curl 20:16:24 08/25/03 (6)
- Re: Hi John - jneutron 21:34:29 08/25/03 (5)
- And BTW..You never did say who Dr. Van den Hul was.. - jneutron 21:48:10 08/25/03 (4)
- Everyone is entitled to their opinion.... - Charles Hansen 22:03:03 08/25/03 (3)
- Hmmm. - jneutron 05:41:31 08/26/03 (0)
- Hellllooo Charles... - jneutron 03:45:13 08/26/03 (1)
- OH, and Charles..... - jneutron 04:55:27 08/26/03 (0)
- Peltier effects are reversible with current direction - Commuteman 11:43:41 08/25/03 (1)
- AHA..gotcha - jneutron 11:58:44 08/25/03 (0)