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Chapter 11: Configuring the Arm Using the Prosthetist Interface
Understanding Thresholds and Gains
Thresholds and gains are two terms used in configuring the arm. These terms are
described below.
Thresholds
A threshold is the signal level which specifies the point at which the signal
commanded by the client is translated into motion or switching command by the
arm. Upper and Lower Thresholds in the PI are represented by a pair of horizontal
bars on the vertical scale in the configuration screen.
Gains
Gain is the amplification or scaling factor of the input signal. Gain is calculated as
the ratio of output over input. When you adjust the gain using the gain dial, you are
changing how the arm responds to a user input signal.
Setting Joint or Motion Speed Limits
When setting joint or motion speed limits you need to note the following:
•
Mobius Bionics recommends that clients
NOT
watch the Prosthetist Interface
configuration screens while configuring the arm. Allowing the client to watch
the screens prompts them to respond to the signal level intensity by visual
response. This can interfere with the clients response of inputs to outputs and
affect their comfortable exertion levels.
•
Reassess the configuration based on client comfort throughout the configuration
process.
