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RPM Hall efforct sensor

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fedico94(at)mchsi.com
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Posted: Sun Jun 03, 2012 7:12 am Post subject: RPM Hall efforct sensor

my G3X system uses a Hall effect sensor (made by UMA) on the Slick magneto.  I do not get a reading from this on the MFD and checked set up for proper sensor input.



I note that there is a 10V power supplied to the sensor and it has a ground wire and I beleive a signal wire.  It seems the Hall efect sensor acts as a switch and is suppposed to open the switch breaking the power with each swipe of a magnet.  I tried testing this with my multimeter (analogue) and only saw a sustained 10V reading.



Going forward with this G3X system I think I will have to test the integrety of the wiring from time to time.  I would think if I put a signal down the sensor wire of 10V at some frequency reading I would eventually get a response on the RPM meter on the MFD.  Then I would know that that the sensor is defective.  Or, in this particular case is there some way to bench test the Hall effect switch after removal from the engine ?  



What equipment could I purchase to perform some of these minor sensor tests on glass screen systems with sensor signal tested at the wiring at the sensor or along a connector like the one I have ?  Bob's book has some information on analgoue guages.  What potential for damage exists from these test ?



thanks Robert Federhofer

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harley(at)AgelessWings.co
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Posted: Sun Jun 03, 2012 7:25 am Post subject: RPM Hall efforct sensor

Robert...

     

     I'm not familiar with the UMA hall effect sensor, but any that I     have ever worked with need three wires...one ground, one for power     and one for the signal.Â  Is it possible that the case is a ground     and if you have only two wires then the one you are measuring is the     power and the other the signal? 

     

     Harley

          [quote]        	  Quote: 	
		  --> AeroElectric-List message posted by: fedico94(at)mchsi.com (fedico94(at)mchsi.com)



my G3X system uses a Hall effect sensor (made by UMA) on the Slick magneto.  I do not get a reading from this on the MFD and checked set up for proper sensor input.



I note that there is a 10V power supplied to the sensor and it has a ground wire and I beleive a signal wire.  It seems the Hall efect sensor acts as a switch and is suppposed to open the switch breaking the power with each swipe of a magnet.  I tried testing this with my multimeter (analogue) and only saw a sustained 10V reading.



Going forward with this G3X system I think I will have to test the integrety of the wiring from time to time.  I would think if I put a signal down the sensor wire of 10V at some frequency reading I would eventually get a response on the RPM meter on the MFD.  Then I would know that that the sensor is defective.  Or, in this particular case is there some way to bench test the Hall effect switch after removal from the engine ?  



What equipment could I purchase to perform some of these minor sensor tests on glass screen systems with sensor signal tested at the wiring at the sensor or along a connector like the one I have ?  Bob's book has some information on analgoue guages.  What potential for damage exists from these test ?



thanks Robert Federhofer



	
     [b]

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rv10rob(at)gmail.com
Guest

Posted: Sun Jun 03, 2012 8:34 am Post subject: RPM Hall efforct sensor

Are you using a pull-up resistor?  Other EMS systems (Dynon, AFS, MGL) require one.  See this: http://www.mglavionics.com/Tach_Sender_Instructions.pdf

   

 -Rob

 On Sun, Jun 3, 2012 at 8:25 AM, Harley <harley(at)agelesswings.com (harley(at)agelesswings.com)> wrote:

  	  Quote: 	
		   Robert...



I'm not familiar with the UMA hall effect sensor, but any that I have ever worked with need three wires...one ground, one for power and one for the signal.  Is it possible that the case is a ground and if you have only two wires then the one you are measuring is the power and the other the signal? 

 

Harley

      	  Quote: 	
		   	  Quote: 	
		  --> AeroElectric-List message posted by: fedico94(at)mchsi.com (fedico94(at)mchsi.com)



my G3X system uses a Hall effect sensor (made by UMA) on the Slick magneto.  I do not get a reading from this on the MFD and checked set up for proper sensor input.



I note that there is a 10V power supplied to the sensor and it has a ground wire and I beleive a signal wire.  It seems the Hall efect sensor acts as a switch and is suppposed to open the switch breaking the power with each swipe of a magnet.  I tried testing this with my multimeter (analogue) and only saw a sustained 10V reading.



Going forward with this G3X system I think I will have to test the integrety of the wiring from time to time.  I would think if I put a signal down the sensor wire of 10V at some frequency reading I would eventually get a response on the RPM meter on the MFD.  Then I would know that that the sensor is defective.  Or, in this particular case is there some way to bench test the Hall effect switch after removal from the engine ?  



What equipment could I purchase to perform some of these minor sensor tests on glass screen systems with sensor signal tested at the wiring at the sensor or along a connector like the one I have ?  Bob's book has some information on analgoue guages.  What potential for damage exists from these test ?



thanks Robert Federhofer



	




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-- 

 Rob Kochman

RV-10 Flying since March 2011

 Woodinville, WA

 http://kochman.net/N819K



  [quote][b]

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fedico94(at)mchsi.com
Guest

Posted: Sun Jun 03, 2012 9:27 am Post subject: RPM Hall efforct sensor

Food for thought but I think the AHARS unit must have this inside.  The schematic and instructions do not mention any additional resister to be added.  MGL has a nice idea that looks more functional for placement in a small airplane and allow for accessability and serviceing.  Cnnot understand why Big time companies like Garmin design boxes that would be better suited for a 777 with lots or room to work on the unit.  I note that the placement of the sensor is closer to the mounting plate on the 6300 series Slick mag whereas mine appears to be mounted mid body based upon the vent plug for the mag.  The halleffect unit screws into this plug.  Interesting educational videos on YouTube regarding hall efeect sensors (3 types) and how they react to magnet

---

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fedico94(at)mchsi.com
Guest

Posted: Sun Jun 03, 2012 9:33 am Post subject: RPM Hall efforct sensor

That appears to be correct.  The red wire (orange on white for this purpose is input to sensor of 10V.  It has a blu/white wire for ground and a white wire for signal to the unit.  I continued the sheild wire through the plug connector (4 wire--plastic.  The plug holding the Hall sensor) screws into the magneto case.  I could check to see if this is grounding at the magneto case.  The schematic shows only the 3 wire cable sheild grounded at the ADAHRS unit only, as per Bob's teaching in his book

---

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