ISO 9355-3:2006 pdf download.Ergonomic requirements for the design of displays and control actuators -Part 3: Control actuators.
5 Task evaluation and information collection
5.1 Task requirements and characteristics
The division of tasks between the operator and the equipment should have been determined early in the design process according to the recommendations given in EN 614-1 and ISO 9355-1.
There are general and specific requirements imposed by a task which normally cannot be changed. If it is not possible to find a suitable control actuator for a specified task, then the allocation of this task or the task itself has to be reconsidered.
The task requirements considered in this International Standard are ones that experience has shown to be the most important in selecting manual control actuators. They are as follows.
General task requirements:
a) accuracy required in positioning the manual control actuator (accuracy);
b) speed of setting required (speed);
c) force/torque requirements (force).
Specific task requirements:
d) need for visual checking of manual control actuator setting (visual check);
e) need for tactile checking of setting (tactile check);
f) need to avoid inadvertent operation (inadvertent operation);
g) need to avoid hand slipping from manual control actuator (friction);
h) need for operator to wear gloves (use with gloves);
i) need for easy cleaning (ease of cleaning).
The general task requirements are used to identify classes of suitable control actuators. The specific task requirements are used in selecting individual control actuators within these classes. In evaluating the task requirements, the classification scheme according to Table 1 should be used. This differentiates between five different levels, from 0 to 4.
5.1 Task requirements and characteristics
The division of tasks between the operator and the equipment should have been determined early in the design process according to the recommendations given in EN 614-1 and ISO 9355-1.
There are general and specific requirements imposed by a task which normally cannot be changed. If it is not possible to find a suitable control actuator for a specified task, then the allocation of this task or the task itself has to be reconsidered.
The task requirements considered in this International Standard are ones that experience has shown to be the most important in selecting manual control actuators. They are as follows.
General task requirements:
a) accuracy required in positioning the manual control actuator (accuracy);
b) speed of setting required (speed);
c) force/torque requirements (force).
Specific task requirements:
d) need for visual checking of manual control actuator setting (visual check);
e) need for tactile checking of setting (tactile check);
f) need to avoid inadvertent operation (inadvertent operation);
g) need to avoid hand slipping from manual control actuator (friction);
h) need for operator to wear gloves (use with gloves);
i) need for easy cleaning (ease of cleaning).
The general task requirements are used to identify classes of suitable control actuators. The specific task requirements are used in selecting individual control actuators within these classes. In evaluating the task requirements, the classification scheme according to Table 1 should be used. This differentiates between five different levels, from 0 to 4.
