S/D Curve
This mode generates rectangular interrupted galvanic pulses for plotting
strength/duration curves. Output is from channel A at constant voltage only.
Pressing the S/D Curve button in the Stimulator mode list produces this
screen –
The start pulse width may be adjusted from 100ms to 1s by repeatedly
pressing the Start button and the end pulse width from 10μs to 1ms by
repeatedly pressing the ‘End’ button. This defines the range of
measurements and thus the start and end points of the S/D graph. Sufficient
time must be entered to complete the S/D test – 10minutes should be more
than adequate. With the correct electrodes (ball muscle testing electrode and
large dispersive pad electrode) in place over the muscle to be tested touch
‘OK’ then slowly increase the output until a muscle contraction is detected.
The screen will be showing a flashing Treatment sign and the axes of the
S/D graph will be displayed.
The graphic at the bottom of the screen displays the pulse width and the
progress bar shows when the pulse occurs. Pulse repetition rate is fixed at
20/min. Once muscle contraction has just been detected press ‘Next’.
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