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Hi. i need your advised about hour meter. how is the term if on hour meter are equal with one hour solar system? especially with engine. is it really related with idle RPM? how is the standard to get equal with one hour solar system? Many Thank's for your kindness. Regards, Effendy
An hour meter don't bother with any variances in the solar system. You just measure time as exactly as you can. Note that the processor crystal isn't normally so very exact - the frequency can vary a lot with temperature.
However, when measuring the running time of a lamp or a motor, it isn't so important to measure with five or six digits of precision - the mechanical variance in the tested device is way bigger.
Just let the processor count time - for example by defining a 1Hz interrupt that you may accumulate whenever the device you compute the running time for is on. It is up to you or the customer to define the definition of "on", i.e. if it is enough that the motor is running, or if idle time should be ignored. The motor manufacturer should have information about this.
"how is the term if on hour meter are equal with one hour solar system?"
I'm sorry, that sentence makes no sense. Please explain!
"is it really related with idle RPM?"
Is what related? In what context? Idle RPM of what?
"how is the standard to get equal with one hour solar system?"
Sorry, that sentence also makes no sense. What standard? What do you mean by "one hour solar system"?
Without knowing any other context, an "hour meter" would just be something that measures time - in hours!
Are you talking about a device to measure the total time that some system has been running? If so, see: http://www.keil.com/forum/docs/thread14653.asp
i want to count on how many hours the tractor has been run. is it related with the engine speed (radian per minutes). example if they just put the engine run with no load in one hour, is it same as 1 hour meter? in what condition to get the result as same as 1 hour time? Thank's
"i want to count on how many hours the tractor has been run."
What tractor? You never mentioned any tractors before! Is it a solar-powered tractor?!
Anyhow, counting "how many hours the tractor has been run" is simple, isn't it? You just need to detect whenever the tractor is running and, whenever it is running, you increment your time count at a suitable rate.
You will, of course, need some sort of long-term storage to keep hold of the count...
"is it related with the engine speed (radian per minutes)."
The engine is either running, or it isn't.
However, if you want to record additional details - like engine speed, load etc - it's up to you to decide what you want to record!
I'd brand this thread like this:
"the cosmic connection"
:-)