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magnetometer location

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jdporter

Joined: 01 Nov 2009
Posts: 1

Posted: Sun Nov 01, 2009 10:08 am Post subject: magnetometer location

I'm using 2 EFIS units and could connect both to the same magnetometer 

but wanted to have backup. Is there any problem mounting them next to 

each other side by side. Will they interfere or cross talk with each other?

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun Nov 01, 2009 2:36 pm Post subject: magnetometer location

At 11:59 AM 11/1/2009, you wrote:

 	  Quote: 	
		  



I'm using 2 EFIS units and could connect both to the same 

magnetometer but wanted to have backup. Is there any problem 

mounting them next to each other side by side. Will they interfere 

or cross talk with each other?


	


    magnetometers don't interfere with each other but

    their measurement accuracy can be polluted with

    stray fields from current in wires and nearby

    magnetic materials. At Beech we used to mount these

    things out in the wing but located about 12" away

    from wiring to the tip.  Your strobe wiring is

    magnetically compatible since all outbound electrons are

    balanced by inbound electrons in the same bundle.

    Note that the shield on the strobe wire has nothing

    to do with the magnetics. The nav light wiring could

    run close to the magnetometers if it were a twisted

    pair that takes outbound and inbound electrons past

    any point closer than say 12" to the magnetometer.

        Bob . . .



         ---------------------------------------

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

         ---------------------------------------

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longg(at)pjm.com
Guest

Posted: Mon Nov 02, 2009 7:35 am Post subject: magnetometer location

Judson,



I recently mounted two of the Dynon type next to each other behind the

panel. The dealer said you "might" get away with it. Way too much

interference with stuff. they were way off. I then set them on the top

of the panel just to see the difference - wow, right on! ok, get them

out of the panel and over to the wings or maybe behind the seat. to keep

them separate I mounted them in the stub wing area on each side of the

Legacy. you must be very careful they are mounted at the same angle as

the unit. Put them where they won't get wet and where you have access to

get at them for maintenance. It's all about maintenance.



I find they are sensitive to everything, e.g. spars, landing gear,

pliers in your pocket etc. Get or make an extension cable (easy) and

give them their own space. You'll enjoy the better accuracy.



Glenn



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