be bionic steeper Technical Manual page 30

Vertical Buttons
Electrodes
Selecting Electrodes from the vertical button menu
opens a form, see the myo configuration screen
below. This allows electrode signals to be monitored,
reviewed and adjusted.
The sliders highlighted on the screen below are for
independently adjusting on-threshold and maximum
levels of the individual channels on the hand.
The off-threshold is a predetermined offset from the
on level. The on level (blue line) determines the level
the electrode signal must reach before it is active.
Once the signal reaches this level the hand operates
until the signal drops below the predetermined
off level. The maximum level (red line)
proportional range of the signal input.
With the signals displayed the electrode threshold
and maximum levels can be adjusted using the
relevant sliders. The strength of the signal is displayed
as a green vertical bar with the peak signal indicated
as single green line. On closing the form the settings
are retained for configuring the hand using the Send
to Hand option. The embedded animation system
enables modification of the threshold settings to be
sampled without the need to keep sending data to
the hand. These can then be sent to the hand once
the user is comfortable with the settings.
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The animation will open and close in response to the
electrode signals.
This system provides a useful 'myo' assessment tool
for the upper extremity amputee, and also provides
a training aid for use both pre and post prescription.
Co-contraction
Selecting Co-contraction opens a form, shown below,
to monitor and set the co-contraction signals.
This option is only available when Mode 5 is selected
from the drop down menu.
In Mode 5, co-contraction is used to move between
default and alternate grip patterns. The blue horizontal
lines show the on-threshold level set during the myo
configuration process, and can be adjusted from this
sets the
option if necessary.