Omega RD260A - Manual (Page 61)

6 - 10
EXPLANATION OF SQUARE ROOT:
This recorder uses the following square rooting-method:
Let us define the items as follows:
V
min
= minimum value of recording span (SPAN L)
V
max
= maximum value of recording span (SPAN R)
F
min
= minimum value of scale (SQRT SCL L)
F
max
= maximum value of scale (SQRT SCL R)
V
x
= input voltage
F
x
= scaling value
The relationship between V
x
(input voltage) and F
x
(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
– F
min
) x 10%
Between b and c in the graph, the following relation exists between F
x
and V
x
:
F = (F – F ) + F
x max min
V – V x min
V – V
max min
min
And between a and b, the relation is:
F = (V – V ) + F
x x min
max min
10 (F – F )
V – V
max min
min