Surface EMG

Biometrics Ltd Surface EMG sensors, systems and electrodes have been extensively researched and developed over a number of years incorporating the latest design principles and technologies for movement analysis.

The result is a versatile, state of the art range of EMG equipment which is reliable, accurate and easy to use.

Full Specifications

When a muscle contracts, electrical activity is generated within the muscle which may be measured using electrodes placed on the surface of the skin. This electrical signal is usually in the order of up to 3,000 micro volts and is referred to as electromyography or EMG.

Biometrics Ltd offer a technologically advanced yet cost effective range of EMG display and data capture systems offering both full portability and real time display and analysis options.

Biometrics sensors and instrumentation are used extensively in the fields of ergonomics, sports science and medical research where measurements of surface EMG are commonly taken for a wide range of applications such as:

  • Symmetry studies during gait
  • Timing data in Biomechanics
  • Work done and fatigue studies
  • Work environment and tool design
  • Sports performance
  • Neuro Rehabilitation
  • Education
  • Veterinary Science

Biometrics Ltd precision bipolar, differential EMG sensors are available in two versions - the SX230 has integral electrodes with a fixed electrode distance of 20mm and the SX230FW that uses disposable electrodes and has a variable electrode distance. Ninety five percent of Biometrics Ltd customers use the SX230.

Surface EMG Sensor SX230

The SX230 is an active probe manufactured by Biometrics Ltd which provides superb quality of signal and ease of use. Unique to the design is the amplifier's input impedance of >10,000,000 M Ohms. This means in practice that little or no skin preparation is required and no conducting gels are required. To use the SX230 EMG sensor simply apply the electrode to the muscle being measured using the die cut medical grade double sided adhesive tape (part no. T350). The quality of the signal received is excellent for both static and dynamic applications.

The SX230 EMG sensor is extremely versatile, readily connecting to the portable DataLOG system and the tethered DataLINK system and K800 general purpose amplifier.

All three of these instruments can be used to:

  • Collect and display the EMG data
  • Integrate the EMG data with data from other sensors
  • Synchronise the EMG data with third party systems such as
    • Video motion capture such as Vicon, Qualysis, and Peak Performance
    • 3D force plate systems such as Kistler and AMTI

As well as recording the EMG data, both the DataLOG and DataLINK systems provide software to software communication in real time via the included Microsoft Dynamic Link Library. This means that your EMG data can be collected in real time in third party software with a minimum amount of programming.

The DataLINK system and K800 amplifier can be interfaced to third party hardware, such as National Instruments A to D cards via the R2000i Analogue output cable.

EMG Amplifier SX230FW

For applications where variable inter-electrode distance is desired, the EMG Amplifier SX230FW has the same superb signal pickup of the SX230. Instead of the integral electrodes of the SX230, the SX230FW has two flying wire leads for use with any reusable or disposable SEMG electrode incorporating a 4 mm snap. The maximum inter-electrode distance is 170 mm and the minimum distance is dependent upon the size of the electrodes used.

The surface EMG electrode (SEN3001) may be used with the SX230FW. The SEN3001 is a small (22 x 28 mm) silver/silver chloride EMG electrode designed for single or multiple applications to the same patient/subject.

Wrist Strap R506/ R306

When using the EMG sensor SX230 with any Biometrics Ltd instrument, independent of the number of EMG sensors used at any one time, only one of the following ground reference cables is required:

The R506 Wrist Strap has a standard 4mm snap connector and comes with convenient elasticated wrist bands for ease of use. The R506 may also be used with proprietary reusable or disposable electrodes having a 4mm snap.

The R306 comes with a standard 2mm spring plug for connection to proprietary disposable electrodes with a 2mm spring socket.

Surface EMG Electrodes SEN3001

The surface EMG electrode may be used with the EMG Amplifier (SX230FW). The silver chloride EMG electrode is designed for single or multiple applications to the same patient/subject. It is 22 x 28 mm in size.