Biosignalsplux Electromyography Manual de usuario

biosignal acquisition tool-kit for advanced research applications

Electromyography (EMG) Sensor User Manual

Electromyography (EMG)

User Manual

PLUX –Wireless Biosignals, S.A.

Av. 5 de Outubro, n. 70 –2.

1050-059 Lisbon, Portugal

[email protected]

http://biosignalsplux.com/

v.1.0

This information is provided "as is," and we make no express or implied warranties whatsoever with respect to functionality, operability, use, fitness for a

particular purpose, or infringement of rights. We expressly disclaim any liability whatsoever for any direct, indirect, consequential, incidental or special

damages, including, without limitation, lost revenues, lost profits, losses resulting from business interruption or loss of data, regardless of the form of action or

legal theory under which the liability may be asserted, even if advised of the possibility of such damages.

ATTENTION

Please read this datasheet before

using your biosignalsplux sensor

The information contained in this document has been carefully checked and were made every effort

to ensure its quality. PLUX reserves the right to make changes and improvements to this manual and

products referenced at any time without notice.

The word Bluetooth and its logo are trademarks of Bluetooth SIG Inc. and any use of such marks is

under license. Other trademarks are the property of their respective own.

Please check your systems and sensors after receiving and before using it the first time to confirm if it

contains all the ordered sensors, accessories and other components. Contact our support via e-mail at

[email protected] if there are any variations from your original order.

For regulatory information, please see the Regulatory Disclaimer at the end of this document.

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TABLE OF CONTENTS

1. General Information............................................................................................................. 4

1.1. General Description ........................................................................................................... 4

1.2. Typical Unfiltered Sensor Output........................................................................................ 4

1.3. Sensor Specifications ......................................................................................................... 5

1.4. Features ............................................................................................................................ 5

1.5. Applications....................................................................................................................... 5

1.6. Transfer Function (Conversion Formula)............................................................................. 5

1.7. Electrode Connections & Sleeve Color Meanings................................................................. 5

1.8. Physical Characteristics...................................................................................................... 6

2. Sensor Application Notes.......................................................................................................... 7

3. Using the Electromyography (EMG) Sensor with biosignalsplux & OpenSignals .......................... 9

3.1. Connecting the sensor to biosignalsplux Systems................................................................ 9

3.1.1. biosignalsplux 4-Channel Hubs............................................................................................. 9

3.1.2. biosignalsplux 8-Channel Hubs............................................................................................. 9

3.1.3. biosignalsplux Solo & Single-Channel openBAN Devices ................................................... 10

3.2. Configuring the Sensor in OpenSignals.............................................................................. 11

3.2.1. OpenSignals (r)evolution (Windows, macOS, Linux) .......................................................... 11

4. Technical Notes...................................................................................................................... 13

5. Scientific Publications Using the Electromyography (EMG) Sensor............................................ 14

6. Safety & Maintenance ............................................................................................................ 15

6.1. Safety Instructions........................................................................................................... 15

6.2. Transportation and Storage.............................................................................................. 16

6.3. Cleaning .......................................................................................................................... 16

7. Ordering Guides, Regulatory & Legal Information.................................................................... 17

7.1. Ordering Guide................................................................................................................ 17

7.2. Guarantee of Quality & Warranty..................................................................................... 17

7.3. Warranty Voidance.......................................................................................................... 17

7.4. Contact & Support ........................................................................................................... 17

7.5. Regulatory Disclaimer...................................................................................................... 18

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1. General Information

1.1. General Description

The biosignalsplux Electromyography (EMG) is designed to monitor muscular activity even in the most

extreme conditions. The bipolar configuration is ideal for uncompromised low-noise data acquisition,

and the raw data output provides medical-grade data enabling it to be used for advanced and highly

accurate biomedical, biomechanics, and sports research, among many other possible applications.

Together with our available EMG Analysis and Muscle Load Analysis add-ons for our OpenSignals

(r)evolution software, one can easily extract statistical temporal and spectral parameters for further

analysis of the acquired sensor data.

Figure 1: biosignalsplux Electromyography (EMG) sensor (standard version).

1.2. Typical Unfiltered Sensor Output

Figure 2 shows a typical unfiltered EMG sensor output acquired along the muscle of the biceps while

two muscular contractions are performed over a time of 10 seconds. The raw digital sensor values

received from the biosignalsplux device ranged between 0 and 2n-1 (n=sampling resolution) were

converted into the original unit of measurement of this sensor (mV) using the transfer function found

in section Transfer Function (Conversion Formula).

Figure 2: Typical unfiltered sensor output (signal acquired from the biceps while two contractions are performed).

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1.3. Sensor Specifications

> Gain:

1007

> Range:

±1.49mV (@ VCC = 3V)

> Bandwidth:

25-500Hz

> Consumption:

1mA

> Input Impedance:

>100GOhm

> CMRR:

100dB

1.4. Features

>Bipolar differential measurement

> Unobtrusive & lightweight sensor

>High signal-to-noise ratio

> Pre-conditioned analog output

> Medical-grade raw data output

> Ready-to-use form factor

1.5. Applications

> Life sciences studies

>Biomedical Research

> Human-Computer Interaction

>Robotics & Cybernetics

>Physiology studies

> Biomedical device prototyping

>Psychophysiology

>Biomechanics

>Ergonomics

1.6. Transfer Function (Conversion Formula)

The analog sensor signals acquired with biosignalsplux devices are converted into digital values ranged

between 0 and 2n-1 (n=sampling resolution, usually 8-bit or 16-bit) and streamed in the raw digital

format.

In most applications, the original physical unit of the acquired EMG signal is preferred or required. The

raw digital sensor samples can be converted back into millivolt (mV) using the following formulas:

󰇛󰇜󰇡



󰇢  



(1)

󰇛󰇜 󰇛󰇜  

(2)

Valid sensor range: [-1.49mV, 1.49mV]

with: 󰇛󰇜EMG signal in Volt (V)

󰇛󰇜EMG signal in milli-Volt (mV)

 Value samples from the sensor/channel (raw digital value)

Sampling resolution (default: 16-bit resolution (n=16), although 12-bit and

8-bit may also be found in older versions)

 Operating voltage (3V when used with biosignalsplux)

 Sensor gain (1007)

1.7. Electrode Connections & Sleeve Color Meanings

Sleeve Color

Red

Black

Electrode Cable

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See Section 2 for more information on where to place the electrodes and to connect electrodes cables

for EMG acquisitions.

1.8. Physical Characteristics

> W1 x L1 x H1:

1.6x2.2x0.5cm

> W2 x L2 x H2:

1.5x1.75x0.55cm

> W3:

> A1:

0.9cm

105.0±0.5cm

> L3:

> A2:

0.5cm

5.0±0.5cm

> A3:

2.5±0.5cm

> D:

0.4cm

> Available sleeve colors:

White, Black, Blue, Green, Red, Yellow, Gray, and Brown

Figure 3: Physical characteristics of the standard Electromyography (EMG) sensor.

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2. Sensor Application Notes

The biosignalsplux EMG is designed to acquire muscular activity along a muscle fibre of interest.

Muscle activations are triggered by bioelectrical signals of very low amplitude sent from motor control

neurons on our brain to the muscle fibres. Electromyography (EMG) enables the translation of these

electrical signals into numerical values, enabling them to be used in a wide array of applications.

The two measuring electrodes must be placed along the muscle fibre and on the muscle hill. The

reference electrode must be placed in a region of low muscular activity, optimally on a bone such as

the elbow or the clavicle.

An example is the measurement of the muscular activity of the muscle biceps brachii (see muscle

highlighted in red in Figure 4). The electrode positioning for this muscle is shown in Figure 4 in which

the two measuring electrodes are placed on the muscle and the reference electrode on the bone.

Figure 4: Electrode positioning (I) to measure signals from the muscle biceps brachii (marked in red).

Possible electrode positions are listed in Table 1. The positive and the negative measuring electrodes

can be positioned in either way but along the muscle fibre and on the muscle belly. The reference

electrode must always be positioned on a bone.

Table 1: Possible electrode positions.

Positive Electrode (+)

(red sleeve)

Negative Electrode (-)

(black sleeve)

Reference Electrode

(white sleeve)

Muscle position 1

Muscle position 2

Bone

Muscle position 2

Muscle position 1

Bone

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The muscular contraction of the biceps brachii can be performed by flexion of the elbow and

supination of the forearm (see Figure 5).

Figure 5: Muscular contraction of the muscle biceps brachii (marked in red) while performing flexion of the elbow, forearm

in supination.

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3. Using the Electromyography (EMG) Sensor with biosignalsplux &

OpenSignals

3.1. Connecting the sensor to biosignalsplux Systems

3.1.1. biosignalsplux 4-Channel Hubs

The biosignalsplux EMG sensor is compatible with all 4 analog input channels of the 4-channel

biosignalsplux hub, but incompatible with the reference/ground port. Connect the sensor to an analog

input to use it with this device.

Figure 6: EMG compatible biosignalsplux channels (green checkmarks).

3.1.2. biosignalsplux 8-Channel Hubs

The biosignalsplux EMG sensor is compatible with all 8 analog input channels of the 8-channel

biosignalsplux hub, but incompatible with the reference/ground and digital I/O ports. Connect the

sensor to an analog input to use it with this device.

Figure 7: EMG compatible biosignalsplux channels (green checkmarks).

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3.1.3. biosignalsplux Solo & Single-Channel openBAN Devices

The biosignalsplux EMG sensor is compatible with the analog input channel of the biosignalsplux Solo

(openBAN) device. Connect the sensor to the analog input channel to use it with this device.

Figure 8: Connect the EMG to the analog input channel of the biosignalsplux Solo (openBAN).

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