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  #11  
Old 11-13-2018, 09:03 AM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 2,736
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Below is a quote from page 2-2 of the D-180 installation manual. I suggest that ALL electrical loads be turned on during this test. Make sure the airframe ground connection is tight and that there is no paint interfering with the connection.

Quote:
Because of the current drawn by the FlightDEK-D180, even very small resistances between
battery ground and instrument ground can cause voltage differences which adversely affect
engine sensor readings. An easy way to test the quality of the instrument’s ground is to measure
voltage between the ground pin at the FlightDEK-D180 and the ground lead at your aircraft’s
battery. With the FlightDEK-D180 powered on, connect one lead of your voltmeter to a free
ground lead coming from the FlightDEK-D180. Connect the other lead of your voltmeter to the
ground terminal of your battery. The voltage between these two points should measure very
close to 0 mV (within 5 mV). If it does not, you must improve the ground connection between
the ground of your battery and that of your avionics bus.
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RV-12 Flying
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  #12  
Old 11-13-2018, 08:05 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,357
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Thanks,Joe.

After reading through the manuals I think what I heard in the middle of the cacophony was “EMS Alert” as opposed to “EMF Low”. I talked to Dynon today and will send the unit in tomorrow to get checked. I don’t think it is a grounding issue because only the temperature indications are affected. I’ll let you know whatDynon says.

Rich
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  #13  
Old 11-13-2018, 08:06 PM
PilotBrent PilotBrent is offline
 
Join Date: Dec 2011
Location: Hackettstown, NJ
Posts: 439
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I'm no expert like Joe Gores, but I think a failing voltage regulator has the potential to generate all kinds of strange electrical readings from sensors. I've also read that replacing the battery for some people has for whatever reason extinguished unexplained gremlins.
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  #14  
Old 11-14-2018, 12:26 PM
rcarsey rcarsey is offline
 
Join Date: Jul 2012
Location: North Brunswick, NJ
Posts: 57
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Just FYI.. sorta related.. these symptoms reminded me of a video I had watched recently..

skip to 5:30 where his electrical problem begins.. and 7:45 he shows you the weird sensor readings..

https://www.youtube.com/watch?v=qRvJ-5JgT_4

This guy's problem turned out to be that the B+ wire to the alternator was arcing. But, it goes to show you how an electrical issue may show up on sensors... not a way I would expect.
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  #15  
Old 11-14-2018, 09:15 PM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
Posts: 2,357
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Thanks for the suggestions. I sent the unit to Dynon today, so we’ll see.
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