4
Trying Your MyoTrac for the First Time
Plug the MyoScan sensor into the
INPUT
jack. Set the switches
inside the battery compartment to:
OFF
,
OFF
,
ABV
,
NAR
(fig. 7).
Set the gain switch to the
x1
position. Turn the volume up. Set the
threshold potentiometer to
10
(fig. 6).
Snap a Triode electrode on the three MyoScan connectors (fig. 2).
Hold the MyoScan sensor on your cheek with a light pressure,
placing it just below the cheekbone (over the temporomandibular
joint). Make certain that all three electrodes contact the skin.
Observe the tone and bar graph reading as you tense and relax your
jaw by clenching your teeth.
When the first yellow LED lights up, the actual EMG reading
corresponds to the threshold value that is set on the THR. Dial, in
this case, 10
V.
Use of the MyoScan™ Sensor
The MyoScan sensor incorporates sensitive electronic circuitry to
amplify the minute EMG signals directly under the electrode
connectors so that the MyoTrac readings will not be affected by
cable movement or outside electrical interference. For the MyoScan
sensor to function properly, electrodes must be inserted on the
sensor head. There are several choices of electrodes which can be
used, depending on the muscle site to be monitored. The disposable
Triode electrodes will be adequate for most applications.
Disposable Triode Electrodes (T3402M):
Disposable electrodes
avoid cross contamination of patients. The foam-backed triangular
Ag-AgCl (silver-silver chloride) Triode electrodes can be used for
scanning most muscle sites for activity. Remove the back covering
exposing the adhesive to firmly hold the MyoScan sensor in place
(see figure 2).
