[PSES] Large Environmental chamber

2024-02-06 Thread Gary Tornquist
Hi experts,

I’m having trouble finding a test lab with an environmental chamber large 
enough to do temperature cycling on a heat exchanger measuring 3.4m long, 0.7m 
tall, and 0.3m wide.  Anybody know of one?

cheers,
Gary Tornquist 


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Re: [PSES] shielded probes do not work in the near field

2024-02-06 Thread John Woodgate
Hi, Doug. That's very interesting. I wonder if there would be a 
resonance effect if the gap in the shield were adjacent to the connector 
instead of being in the centre of the opposite side.


On 2024-02-06 00:22, doug emcesd.com wrote:


Hi All,

The following three articles and the referenced paper from my website 
show that, contrary to popular belief, shielded magnetic field probes 
do not work in the near field. The E-field shielding in magnetic field 
probes only work in the far field or for fields that are symmetrical 
about the center line of the probe. Take a look at the articles:


  * June 2008, The Square Shielded Loop - Part 2, Parasitic Coupling

(Electric Field Shielding of Magnetic Loops is Not Always Effective!)
  * July 2008, The Square Shielded Loop - Part 3, Parasitic Coupling
Between Unshielded Wire Loops 
  * August 2008, The Square Shielded Loop - Part 4, Coupling to a PCB

(From Shielded and Unshielded Magnetic Loops)
  * Signal and Noise Measurement Techniques Using Magnetic Field
Probes  *(~600K)*
  o (1999 IEEE EMC Symposium paper)

Doug



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--
OOO - Own Opinions Only
John M Woodgate, Rayleigh, Essex UK
Keep trying

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