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6 - 10
EXPLANATION OF SQUARE ROOT:
This recorder uses the following square rooting-method:
Let us define the items as follows:
Vmin = minimum value of recording span (SPAN L)
Vmax= maximum value of recording span (SPAN R)
Fmin = minimum value of scale (SQRT SCL L)
Fmax = maximum value of scale (SQRT SCL R)
Vx= input voltage
Fx= scaling value
The relationship between Vx (input voltage) and Fx (scaling value) is as shown in the
graph below (the graph configuration is approximate).
F
F
max
F
min
b
b'
a
c
V
V
min V
max
max min
(V V ) x 1%
(F
max Fmin ) x 10%
Between b and c in the graph, the following relation exists between Fx and Vx:
F = (F – F ) + F
xmax min
V V
xmin
V – V
max min min
And between a and b, the relation is:
F = (V V ) + F
xxmin
max min
10 (F F )
V V
max min
min
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