whitetiger said:
On a modern era tractor with a electric hour meter there is no connection between hours and RPM's. At idle 60 minutes = 1 hour same as wide open throttle. It works exactly like the hour meter on my 2003 Silverado 2500 HD.
Wt.. having a digital display ( led/lcd ) and an analog countiong meter is not new. I have heavy equipment parked outside with digital dash clusters, yet they still count pto hours.
Digital -display- and digital clock ( vs analog clock ) are 2 seperate items.
You could have a digital clock and an analog numeric display.. or an analog clock with analog display, or a digital clock with digital display. In short.. the display does not automatically dictate the clock metering method.
I can hit radioshack and pick up a handfull of parts and make a display that uses 2 multi segment led's, and a trip switch and a display driver circuit and a simple counting circuit. Each trip of the switch add's +1. You could put this on a bicycle and mount on a rear wheel support and put a business card in the spokes to trip switch on every wheel rotation.
No matter how long that bike 'sets' there.. the digital display won't change numbers, until that wheel starts spinning. See where this is going?
( display type does not denote clock metering method )
Similarly, it would be quite easy to make a digital display circuit that accepted trigger input from a counting circuit, and the counting circuit was reading some engine reference like a timing pulse, or crank or other gear or shaft rotation, doing the math to equate pto rotation, and then triggering when 'x' rotations were met to signify a pto rotation, then sending that info to the digital clock display.. as pto rotations were counted and added, the display would increment.. etc... ( now add in other circuitry for memory, and etc.. and you may well get what some tractors and other equipment are using..
Soundguy