Tel: +31 (0) 541 534603

Merging Man and Machine - the Bionic Age


The Refa is a 72- or 136-channel stationary system for measuring EEG or HD EMG. The Refa always includes unipolar electrophysiological inputs (ExG) but can also include four bipolar electrophysiological inputs (BIP) and four auxiliary inputs (AUX).

The Refa includes TMSi's proprietary TAS2 (True Active Signal Shielding) technology for clean signals and data completely free of mains interference and cable movement artifacts. It does not include hardware filters (other than anti-aliasing) so the raw data is always available and quick recovery ensured. The ExG inputs are configured as a reference amplifier: all channels are amplified against the average of all connected inputs. The BIP inputs are used to measure two physiological signals differentially to each other. Using ExG and BIP channels, signals like EEG, EMG, ECG, EOG, EGG, etc. can be measured. The AUX inputs can be used for measuring sensor signals like temperature, pH, respiration, movement, force, angle, etc. Each of these channels has a +5 V and -5 V supply in order to accommodate active sensors or sensor modules.

The Refa system can be delivered with 24, 32, 40, 72 or 136 channels (The Refa High Rate is available with 8, 16, 32, 40 and 72 channels). It is also possible to cascade two Refa's, resulting in a total channel count of 272 channels.The Refa is delivered including an external power supply which plugs into the mains socket. The Refa is connected to a PC by means of a bi-directional optical fiber.

    • Front-end with up to 136 channels

    • No cable movement artifacts

    • No filtering (including Notch filter) for true signal quality

    • Digital trigger inputs (8, isolated)

    • Built-in impedance measurement

    • Max. sample rate from 2 up to 20 kHz

    • CE certified (class 2A, type CF)

    • FDA 510k approved

  • User Manual_Refa_EN-Rev3.pdf

    Technical Specifications_Refa-Rev4.pdf

  • Didier Staudenmann, Jaap H. van Dieën, Dick F. Stegeman, Roger M. Enoka (2014) 
    Increase in heterogeneity of biceps brachii activation during isometric submaximal fatiguing contractions: a multichannel surface EMG study.

    Journal of Neurophysiology, March 1, 2014 - Vol. 111, no. 984-990

    Jens Blechert et al. (2014) 
    Eat your troubles away: Electrocortical and experiential correlates of food image processing are related to emotional eating style and emotional state.

    Biological Psychology - Volume 96, February 2014, Pages 94-101

    Chiel van de Steeg et al. (2014) 
    High-density surface electromyography improves the identification of oscillatory synaptic inputs to motoneurons.

    Journal of Applied Physiology, 15 May 2014 - vol. 116, no. 1263-1271

For more information, please contact us:

Contact us  Tel: +31 (0) 541 534603


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7575 EJ Oldenzaal
+31 (0) 541534603




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