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  • Author or Editor: Kalman Mathe x
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In the research a prototype to record the activity of ensembles of single neurons from the brains of freely moving rats has been developed. The DT4 prototype has 16 inputs, weighs 10 g and is powered for over 4 hours by an 18 g battery. The DT4 digitizes signals at 24-bit resolution, allowing signals as small as 10 mV to be resolved. Each input is initially low-pass filtered (5,5 kHz) and digitized (12 kHz). The digital signals are combined into a single data stream and the serialized data are then transmitted to a remote DSP-based recording system via either an optical fiber or 2.4 GHz radio channel.

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Pollack Periodica
Zoltan Vizvari
Tibor Kiss
Csaba Ver
Kalman Mathe
Bojan Kuljic
Ferenc Henezi
, and
Peter Odry


The presented multichannel measuring system working on various frequencies is suitable either for electrical impedance spectroscopy or tomography. The authors of this paper have developed the complete measurement system and a graphical user interface platform. The accuracy of impedance amplitude and phase are 1 ppm and 0.01°, respectively. The basic instrument works with 8 channels and can be expanded to 64 channels with the application of multiplexing or multiple parallel connected instruments in the same system.

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