Re: uMonitor and Plasma III Tach Pulse
toggle quoted messageShow quoted text
This is for the archives for those of us Neanderthals still using the uMonitor. After connecting the Plasma III tach output signal directly to the uMonitor tach input, I did some testing. I removed the original R3 (that I had installed over 30 years ago!). I temporarily replaced R3 with a 10K ohm potentiometer for testing. After starting the engine, I slowly turned the pot, lowering the resistance. At 6.3K ohms, the uMonitor tach started working and provided a steady RPM signal.
I decided to somewhat split the difference between what Ron Mowrer had stated would be acceptable (about 3K ohms), and what I had found to work with the 10V output from the Plasma III. I installed a 4.7K ohm resistor for the new R3. I tested it this evening and it worked fine. There is no need for a capacitor between the Plasma III and the uMonitor input.
Long EZ N83DT
From: canard-aviators@... [mailto:canard-aviators@...]
Sent: Tuesday, June 18, 2019 9:59 AM
Subject: Re: [c-a] uMonitor and Plasma III Tach Pulse
Just found the document (Same one as Nick provided) and recall doing this for a client. You may have to reenter all your parameters again.