Electrode Impedance Test Device

The impedance value of a metal microelectrode for neurophysiological research is a very important parameter to characterize the recording performance of the microelectrode. The Thomas RECORDING metal electrode impedance tester model EIT-201 is a precision instrument for measuring metal electrode impedance at a frequency of 1kHz. It is designed as a bench-top model. The model EIT-201 will measure electrode impedance in the two ranges 100kOhm...1MOhm and 1MOhm...10MOhm and displays the impedance value on an easy to read high quality digital liquid-crystal-display (LCD). The EIT-201 has its own sine wave oscillator integrated which generates a very stable 1kHz sine wave test signal. The electrode impedance is measured with a constant currentof 5nA. The EIT-201 measuring circuit is largely unaffected by microelectrode offset or tip junction potentials. The EIT-201 consists of two components: a very robust laboratorystand with integrated microelectrode preamplifier and the mains powered electronic impedance tester.