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Circuit To Combine Mag P-Lead For RPM Measurements

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Matt Dralle
Site Admin

Joined: 08 Nov 2005
Posts: 26320
Location: Livermore CA USA

Posted: Sun Apr 11, 2010 9:28 am Post subject: Circuit To Combine Mag P-Lead For RPM Measurements

Has anyone found a device or circuit to pick off the output from the P leads on the left and right mags for feeding to an RPM measuring device such as the GRT EIS-4000?  The EIS-4000 only has a single RPM input.  The installation manual suggests installing a SPDT switch between the left/right mags and then to the input on the EIS-4000 for manually switching between the mags during drop testing.  But that's pretty hoekey.  Seems like someone should have come up with a simple prioritized switching circuit that would, say, always read the left mag p lead unless there wasn't a signal, then read the right mag P lead output.  In my "spare time" maybe I'll make one if there isn't something already out there like this.



I thought that once upon a time I saw an electronic gizmo you could screw into the standard tack drive that would give an electronic output.  Anyone have a line on this device and whether its compatible with the GRT EIS?



Thanks!!

Matt Dralle

RV-8 #82880 N998RV

http://www.mattsrv8.com - Matt's RV-8 Construction Log

Status: Final Bits/Inspection/Test Flight

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Matt Dralle
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rene(at)felker.com
Guest

Posted: Sun Apr 11, 2010 9:45 am Post subject: Circuit To Combine Mag P-Lead For RPM Measurements

I use the switch.  But I think Vans sells the tack drive unit.

1 plus for the switch.



 	  Quote: 	
		  From a raw data point of view, the switch is better since you are looking at

each mag in isolation.
	




Rene

801-721-6080



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Ron.McGann(at)ausawd.com
Guest

Posted: Sun Apr 11, 2010 2:24 pm Post subject: Circuit To Combine Mag P-Lead For RPM Measurements

I'm with Rene.  The switch is simple and works fine.  Any electrickery needs to consider that one of the mags may be grounded during start.



Cheers

Ron

VH-XRM flying in Oz 



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bcondrey

Joined: 03 Apr 2006
Posts: 580

Posted: Sun Apr 11, 2010 6:00 pm Post subject: Circuit To Combine Mag P-Lead For RPM Measurements

Matt,



You might check with GRT - I've heard that the newer versions of the EIS now come with 2 tach inputs.  Might be an upgrade available.



Bob

RV-10 N442PM



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