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Elemyo | 10 March 2020

Module MYO and sensor MYO-kit.
Examples of EMG signals.

In this article, we showed various forms of EMG signals obtained when working with the modul MYO v1.2 (or sensor MYO-kit v1.1), as well as various of signal forms with the noise influence under different circumstances.

Before you get started, we strongly recommend you to read the detailed instructions for the sensor you are using: MYO v1.0 (or MYO v1.2), MYO kit v1.1 (or MYO-kit v1.0).
The content of the article:
1
Examples of EMG signals
Go to the section
2
Various of signal forms with the noise influence
Go to the section

1
Examples of EMG signals
The sensor is located along the flexor muscle of the ring finger. The signal was recorded using an AKIP-4107 oscilloscope. When recording a signal, the computer was disconnected from the power supply network and located at a distance at least 0.5 m from household power sources.
Signal from EMG sensor. EMG signal recorded with activity of the muscles of the forearm. Single muscle contraction waveform
The location of the MYO v1.2 sensor on the arm
Сигнал с ЭМГ датчика. ЭМГ сигнал, регистрируемый при активности мышц предплечья. Форма сигнала при единичном мышечном сокращении
Fig. 1: Single, continuous muscle contraction.
Датчик мышц, регистрация сигнала при мышечной активности. Миограмма при сокращении мышц предплечья.
Fig. 2: Three consecutive muscle contractions.

2
Various of signal forms with the noise influence
1. The signal when the sensor is connected to a PC disconnected (plugged out) from the power supply.
ЭМГ сигнал с датчика при отсутствии наводки 50Гц, единичное сокращение мышцы
Fig. 3: EMG signal in the absence of interference 50Hz (50Hz noise).
2. The signal when connecting the sensor to a PC connected (plugged in) to the power supply.
ЭМГ сигнал полностью зашумлен наводкой 50Гц.
Fig. 4: EMG signal is completely noisy at a 50Hz noise. The reason is a direct connection to a PC connected (plugged in) to the power supply.
ЭМГ сигнал полностью зашумлен наводкой 50Гц.
Fig. 5: EMG signal is very noisy at a 50Hz pickup.
The reason is a direct connection to a PC connected (plugged in) to the power supply.
3. The signal when connecting the sensor to a PC via a USB isolator. The PC is connected to the power supply.
Fig. 6: EMG signal is partially noisy with 50Hz interference.
The level of interference depends on the load on the used household network (there is almost no interference at night and day). After 0.5-1 minute after installing the sensor on the body, the interference is significantly reduced.
4. Touching the body of wires and devices plugged in to the power supply network.
Fig. 7: EMG signal contains 50Hz noise.
Fig. 8: EMG signal contains 50Hz noise.
5. The signal when the sensor is connected to a PC with the power off (the power comes from the battery), but:
a) the power cord is not disconnected from the PC,
b) the power cord is on the side of the PC (for example, it is placed on the same table with the PC).
Fig. 9: EMG signal contains 50Hz noise.
6. The output of the signal to a predetermined value with a strong influence of 50Hz noise or poor skin contact.
Fig. 10: Sensor signal in the first seconds after installation on the body in the presence of strong interference of 50 Hz.