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EMG100C – ELECTROMYOGRAM AMPLIFIER MODULE
The electromyogram amplifier module (EMG100C) is a single-channel, high-
gain, differential input, biopotential amplifier designed specifically for
monitoring muscle and nerve response activity. The EMG100C is
designed for use in the following applications:
Conventional bipolar EMG measurement
Biomechanics
Nerve conduction measurement
Muscular reflex studies
Motor unit potential measurement
The EMG100C will connect directly to any of BIOPAC Systems, Inc.’s series of Ag-AgCl lead electrodes. The best
choice for electrodes depends on the application, but typically, the EL503 adhesive/disposable snap electrodes are
used in conjunction with the LEAD110S pinch lead. If reusable electrodes are required, the EL508S is typically
used; when using EL508S electrodes, you also need adhesive disks (ADD208) and electrode gel (GEL100). Use
two shielded electrodes (LEAD110S/EL503 or EL508S) for the signal inputs and one unshielded electrode
(LEAD110/EL503 or EL508) for ground.
The EMG100C has built-in drive capability for use with shielded electrode leads. Shielded leads are typically
required, as the EMG100C has a frequency response that extends through the 50/60Hz interference bands. The
EMG100C is designed to pass EMG signals and signals associated with nerve responses.
The EMG100C incorporates a variety of filtering options to optimize the amplifier performance when recording
from either surface or needle electrodes, and when recording from either muscle or nerves. For instance, when
recording EMG (muscle) from surface electrodes, the 10Hz to 500Hz bandwidth setting could be used, but when
recording nerve propagation times, the 100Hz to 5,000Hz bandwidth setting could be used.
This graph shows a typical raw EMG
recording. Waveform peaks indicate points
of peak muscle activity.
This graph shows raw EMG and integrated EMG.
To integrate EMG in real-time, set up a calculation channel
in AcqKnowledge using the Integrate function with
Rectify checked ON. In this case, this waveform would be
augmented by a smoothed curve following the positive
envelope of the EMG signal.
ZERO
ADJ
GAIN
500
1000
2000
5000
ON
FILTER
OFF
SHIE LD
VIN+
SHIE LD
VIN-
GND
INTEG
NORM
EMG10 0
EL503
LEAD100S
LEAD100
Electrode connections to the EMG100C to
measure EMG activity from the arm biceps
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