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A few seconds after being turned on, the Pathway MR-20 will automatically display EMG activity. For
example:
This is the beginning of a training session. The top line shows the EMG A channel and the bottom
shows the EMG B channel. Each line of the display shows the level of EMG activity in a moving bar
display. In addition there is a digital (numeric) display which also shows the EMG value in µV
(microvolts). The MR-20 is designed to be held either horizontally or vertically. The horizontal
position is appropriate for reading the text on the display, while the vertical position is often used
during training sessions. In the vertical position increasing muscle activity moves the bar up and
decreasing activity moves the bar down.
To observe the operation of the display, connect the EMG preamplifiers to the MR-20 and apply the
electrodes to a convenient area such as the forearms, as described in the section "Attaching the
Preamplifiers". Note how the moving bar display ascends and descends, as the hand and wrist
muscles are contracted and relaxed.
Because EMG is essentially a logarithmic function, this type of scaling is used for the moving bar
display. As a result, the movement of the bar relates directly to the change in muscle activity.
The changing digital numbers represent microvolt (µV) levels of EMG activity and increase when
contracting and decrease when relaxing. The total microvolt scale is 1 to 800 µV RMS.
If the MR-20 is being held horizontally, the digital display is normally at the right side of the display. If the
level of activity is very large and the bar reaches the right, the digital display will automatically shift from
the right to the left, so it does not interfere with the bar.
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Press the “A” key
.
No Goal Set
will be displayed.
Press the “A” key several times.
Notice that the unit will select (cycle through) all of the goals;
No Goal Set
,
Above Tone
,
Below Tone
,
Above Stim
,
Below Stim
,
Max Display
,
Ratio A/B
.
Press the “A” key
until the
Above Tone
goal is selected. (Not Above Stim)
The unit will automatically select the
Above Tone goal in about 3 seconds.