E-Mag

[Jim Talbot]

I have an 0-360 built by Mattituck in my RV-7
The engine has a Lightspeed Plasma II and a Slick impulse mag.
My AF-2500 gets the Tach signal from the Slick magneto.

The Slick is nearing 500 Hrs and I am planning to replace it with an E-Mag.
Can I use the Tach signal from the E-Mag connector #6?

Thanks
Jim
New Zealand

[Shawn McGinnis]

It should work if you use a 5V signal level. Otherwise you might need to modify the analog module to accept higher voltage pulses. You will also need to change the Pulses per revolution in the calibration.

[Jim Talbot]

Thanks Shawn
The E-Mag installation manual says the tach output on connector #6 is two 10v pulses per revolution.
Connecting a diode (presumably a 5V zener) from the tach output to ground drops the voltage to 5V.
507
The AF-2500 RPM would be changed in calibration for four pulses per two revolutions.
If I connect the E-Mag tach output directly to the RPM input on the AF-2500 with the zener diode to "common" would this be OK?
508
Jim

[Rob Hickman]

Wire it exactly like the PMAG manual, connect both ends of the diode to the PMAG.