page 10
2.0 CALCULATION OF AMPLITUDE
B 600 - CALCULATION OF AMPLITUDE
A B C
The Amplitude depends on the following :
1. Beat per hour of the watch
2. Lift angle in degrees
3. Time between
A
and
C
in seconds
Terms :
t
Terms :
Amp = Amplitude of balance wheel in °
= Lift angle in ° ( most watches have 52 ° )
t = Time between A and C ( in seconds )
t
Example :
lift angle = 52°
n = 28800 beats / h
n = Beat of the watch ( per hour )
Formula : Amp = (3600 * )
( t * pi * n )
(3600 * 52 ) = 187200
(0.009 * 3.14 * 28800) = 813.89
Amplitude
= 230 °
t = 0.009 s
Amplitude 230
Remark : The value of the time ( t ) depends on the mechanical datas
of escapment from the watch. This value is always measured
by the B 600 and the amplitude is calculated.
As you may see in the calculation example, this value is directly
responsible for the result of amplitude.
Conclusion : The B 600 can calculate and display the amplitude of a watch
very exact and stable if the escapment noise is clear and stable
very exact and stable, if the escapment noise is clear and stable.
as it is in figure ( 1 )
But it's impossible with a escapment noise as you can see in
figure 1
Operating - Manual B 600 M / Q
p
p
y
figure ( 2 )
figure 2
