User:Chetvorno/work3

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[edit] For Clock

[edit] Accuracy

Type of clock Oscillator
(frequency)		 Controller Counter chain Indicator Peak accuracy
(Typical accuracy)
Water clock none water flow through an orifice gear train dial or bell 30 min / day
1 hour / day
Verge & foliot clock foliot
0.25-1 Hz		 verge escapement gear train dial or bell 15 min / day
1 hour / day
Pendulum clock pendulum
0.5-2 Hz		 escapement gear train dial 4 sec / year
10 sec / month
Torsion pendulum clock torsion pendulum
0.05-0.125 Hz		 escapement gear train dial
4 min / month
Marine chronometer balance wheel
2-5 Hz		 detent escapement gear train dial 0.1 sec / day
-
Electromagnetic pendulum clock Invar pendulum
0.5-1 Hz		 Electric switch & solenoid circuit gear train dial 1 sec / year
-
Synchronous electric clock AC power line
50 or 60 Hz		 synchronous motor gear train dial sync'd to AC power
Tuning fork clock tuning fork
360 Hz		 oscillator circuit gear train dial
2 sec / day
Quartz watch quartz crystal
32,768 Hz		 oscillator circuit digital counter digital LCD or dial 3 sec / yr
15 sec / month
Digital clock quartz crystal or AC oscillator circuit digital counter digital display -
Computer real time clock quartz crystal
32,768 Hz		 oscillator circuit software counters computer display screen sync'd to UTC
Precision quartz chronometer quartz crystals
3 MHz		 temperature compensated
oscillator circuit		 digital counter digital display -
Rubidium atomic clock Rubidium atoms
6.835 GHz		 microwave cavity oscillator
and phase-locked loop		 digital counter digital display 1 sec / 2,000,000 yrs
1 sec / 20,000 yrs
Cesium atomic clock Cesium atoms
9.192 GHz		 microwave cavity oscillator
and phase-locked loop		 digital counter primary standard 1 sec / 2*109 yrs
1 sec / 2,000,000 yrs