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Elevation from ground to MA terminal
If the MA terminal is hung up vertically to a wall, the optimal ele-
vation from ground to MA terminal is between 1.1 to 1.35 meter.
H optimum = (h man + h woman)/2 - (dlcd + ((tan(alpha-teta) +
tan(alpha + teta)) * disthm/2 + dyt)
Hypothesis:
H optimum = 1.514 - 0.596 * disthm
> H optimum = 1.22 meter
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Tilt the MA terminal if elevation is a constraint
If the MA terminal must be located at a given "H" elevation, the
optimal tilt angle of the MA terminal could be adjusted, in order
to have a good LCD visibility and an optimum finger ergonomics
(MA Angle /vertical = beta)
Beta = Arctan (tan(alpha) + ((h optimum - H)/disthm)) - 25°
Beta = Arctan (0,466 + 2*(h optimum - H)) - 25°
Examples:
H = 1.22 meter (= h optimum)
H = 1.00 meter
H = 1.40 meter
This case is not recommended.
It has a poor finger ergonomics.
20
SAGEM SA document. Reproduction and disclosure forbidden.
h man = 1.75 m (population average)
h woman = 1.70 m (population average)
Distance man/machine (disthm) = 0.5 m
Distance eyes/top head (dyt) = 0.1 m
LCD Angle of view LCD (teta) = ± 25°
LCD Angle/vertical (alpha) = 25°
Distance from middle LCD/bottom of MA (dlcd) =
0.11 m
E
Beta = 0°
Beta = +17°
Beta = -19°
SK-0000011322-02
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