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30th May 2012, 10:18 AM  #23501 
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Join Date: Nov 2009
Location: algeria/france


30th May 2012, 01:28 PM  #23502  
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Quote:
Quote:
The real problem is this: how does one approach a designated zero potential reference point through a path in 3 dimensional space which has time varying magnetic fields... without inducing differential voltages between two wires ala faradays law of induction? Simple. 1. via two paths which do not trap time varying magnetic fields. or 2. via two paths with identical integrated time varying magnetic fields. For #1, geometry of 3d space states that there can only be 3 paths which are magnetically orthogonal, so practical circuit design cannot use this. There are some simple ways around this. For #2, it is almost impossible to do this, and the only practical methods to do this are extremely counterintuitive. The most important thing here is: star grounds are high impedance constructs. NOT for low impedance with high current slew rates. ps...btw, this is standard stuff....and works for uV level instrumentation wires buried in 10 tesla magnets running 13 kiloamps, up to 45 kiloamp primary/15 million amp secondary structures over ten meters tall. j Last edited by jneutron; 30th May 2012 at 01:34 PM. 

30th May 2012, 02:23 PM  #23503 
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Join Date: Jul 2003
Location: Taipei, Taiwan

. . . winding temperature measurement with an RTD perhaps?

30th May 2012, 02:48 PM  #23504 
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Millikelvin accuracy temperature measurement at 1.8 Kelvin using ceramicoxynitride.
1 part in 10e6 magnetic field measurements in 5 to 10 tesla superconducting magnets. Quench detection of the 30 gigajoule ITER solenoid during plasma initiation. As well as some difficult tasks... j 
30th May 2012, 03:18 PM  #23505 
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Moving in respect to what?
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30th May 2012, 03:21 PM  #23506 
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30th May 2012, 03:22 PM  #23507 
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Absolutely right. I always solder 4wire capacitors on breadboards and in prototypes.
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The Devil is not so terrible as his math model is! 
30th May 2012, 03:32 PM  #23508  
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Using the braid option eliminates the mutual inductance. This technique works on diodes and resistors as well. j 

30th May 2012, 03:46 PM  #23509 
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I once even wanted to buy a loom machine to manufacture highend resistors, including noninductive multitap carpets for volume controls.
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The Devil is not so terrible as his math model is! 
30th May 2012, 04:00 PM  #23510  
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Quote:
vac 

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