KAMA 454 tach sensor

[Paddy]

My Tach has not worked in years. So I gave it a look see today. I pulled it out and it looks fine. I tried to measure continuity/ohms but it showed none. I cleaned the end and reset it, 1/2 turn from touching.

Fired up the tractor and measured AC V from sensor harness and it was 0.1 V at the highest. dancing around about 0.06.

Bad sensor?

A side question; Is member Blue Chip of Artrac still posting to this site?

 

[Bob Rooks]

My Tach has not worked in years. So I gave it a look see today. I pulled it out and it looks fine. I tried to measure continuity/ohms but it showed none. I cleaned the end and reset it, 1/2 turn from touching.

Fired up the tractor and measured AC V from sensor harness and it was 0.1 V at the highest. dancing around about 0.06.

Bad sensor?

A side question; Is member Blue Chip of Artrac still posting to this site?

There is no continuity in a "Mag pick up". They are simply what I call a "Tooth counter". Every time a tooth passes by an AC pulse signal is created which is sent to the tachometer.

 

[Paddy]

Thank you Bob. does the 0.1 V AC sound good?

 

[Bob Rooks]

Thank you Bob. does the 0.1 V AC sound good?

I think it should be, but it depends on the trigger threshold of the tach, which I have no idea what that is. As long as you're getting voltage the main thing is the pulses, they should correlate to one of the scales on your VOM.