8
Front Panel Controls
The front panel (see figure 6) includes controls for sound level
(
VOLUME
), threshold level (
THR
), three gain settings,
x1
,
x10
and
x100
for ranges of .08-20, .08-200 and .08-2000 microvolt
(
V) RMS, respectively. A power switch lets you select
OFF
and
either continuous proportional tone feedback (
CONT
) or threshold
feedback (
THR
).
MyoTrac (SA4000P & SA4001P)
Fig. 6 Front Panel
Threshold feedback allows you to set control parameters for the
tone feedback to be enabled or disabled when the EMG signal
exceeds or falls below the threshold setting of the threshold control.
The various threshold functions are chosen from the switch settings
in the battery compartment.
Battery Compartment Controls
Within the battery compartment are switches to set a variety of
choices as follows. (See figure 7.)
WIDE/NAR
band-pass (20-500 Hz. or 100-200 Hz.): Sets the
frequency range for signal detection. The 20-500
H
Z
. range
detects a wider range of EMG signals, but is also prone to
cardiac (EKG)
interference. For this reason, it is not
recommended for monitoring sites on the back or torso.
