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Tachometer Question

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Troy Maynor

Joined: 10 Jan 2006
Posts: 162

Posted: Sun Nov 16, 2008 6:12 pm Post subject: Tachometer Question

Hi Folks,

I have a Rotax 912S in a Europa I have been building. I have a Mitchell

tach. installed and also an Audio Flight Avionics 

AV-10 digital electronic engine monitor. I want to monitor the rpm on both

of these at the same time. Can anyone tell me what precautions I need to

take in connecting these in parallel? I'm not very electronic savy, but I

can understand some of the terms and parts one might use. Any thoughts?



Troy Maynor

N120EU Europa Monowheel Classic

Left to finish:

Seats, engine install underway, some wiring.

Weaverville, NC USA

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Posted: Mon Nov 17, 2008 6:04 am Post subject: Tachometer Question

At 08:59 PM 11/16/2008 -0500, you wrote:

 	  Quote: 	
		  Hi Folks,

I have a Rotax 912S in a Europa I have been building. I have a Mitchell

tach. installed and also an Audio Flight Avionics

AV-10 digital electronic engine monitor. I want to monitor the rpm on both

of these at the same time. Can anyone tell me what precautions I need to

take in connecting these in parallel? I'm not very electronic savy, but I

can understand some of the terms and parts one might use. Any thoughts?


	


   I wish there were a simple answer. There are tachometers, and then

   there are tachometers. MOST were originally crafted to interpret the

   frequency (read rpm) information from magneto p-leads . . . the most

   gawd awful 'signal' in an airplane.



   Over the years, variations popped up including tachs that looked at

   the AC widing of a Rotax engine, hall effect devices that read

   the magnetic field spinning inside a magneto, crankshaft or tach

   drive transducers, etc.



   Each of these variants had 'signal' qualities that might

   make the indicators incompatible with each other when driven

   by a single signal source.



   You need to know what the two indicators expect in the way

   of an RPM sensing signal. Given that you're flying a Rotax,

   it seems likely that the only choices you may have for this

   engine is to read the AC voltage from the alternator winding

   or some sort of add-on crankshaft sensor.



   Given that most tachometer folks expect to read p-leads,

   it may be that your engine will require some sort of signal

   conditioner to make your existing tach indicators function.

   Further, it may need to be a dual-output signal conditioner

   that accommodates both tachs.



   Bob . . .

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