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EMF

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graybeard

Joined: 20 Sep 2011
Posts: 33
Location: Grants Pass, OR

Posted: Sun Apr 08, 2012 2:39 pm Post subject: EMF

Can a ground path generate enough EMF to adversely affect a  magnetometer?  I had planned to use the upper longerons as the ground path  for the elevator trim and tail strobe/position light wiring, but I’m mounting  the Dynon Skyview ADAHRS on a bracket bridging the longerons, bringing the two  in close proximity.  Makes me wonder if I would be better off running  separate ground wires.  

  

 Stan Loer        

 RV-8 QB

    [quote][b]

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Matt Dralle
Site Admin

Joined: 08 Nov 2005
Posts: 26321
Location: Livermore CA USA

Posted: Sun Apr 08, 2012 3:07 pm Post subject: EMF

At 03:39 PM 4/8/2012 Sunday, you wrote:

 	  Quote: 	
		  Can a ground path generate enough EMF to adversely affect a magnetometer?  I had planned to use the upper longerons as the ground path for the elevator trim and tail strobe/position light wiring, but I'm mounting the Dynon Skyview ADAHRS on a bracket bridging the longerons, bringing the two in close proximity.  Makes me wonder if I would be better off running separate ground wires.  

 

Stan Loer        

RV-8 QB


	




Hi Stan,



Always run separate ground wires.  I never depend on the airframe for grounding anything.  I bring all of the ground wires up to a single point behind the panel.  I ZERO and I mean ZERO alternator noise in my headphones.



$.02



I mounted my Dynon Magomenter/AHRS right behind the elevator bellcrank on the RV-6.  The compass swings a far amount when I move the elevator though full-throws.  In contrast, in the RV-8, I mounted the magnometers under the vertical fin and had no problems with erroneous movements or alignment.



$.02



Matt

-

Matt Dralle



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