| 摘要 |
A device to carry out a bioelectrical interaction with an individual by means of electrodes 29, 29 a whereby an on-demand verification of the integrity of the electrical contact of the electrodes is implemented. The device 20 comprises a control unit 22 arranged to determine an occurrence of the predefined event related to a quality of a measured signal. In case the predetermined event is detected, the control unit 22 actuates the testing means 24 . The testing means is arranged to generate the test signals, I 1, 12 and to apply them via a coupling circuit 23, 23 a to the electrodes. In case it is desired that cumulative information about the contact integrity is obtained, is it sufficient to apply a single test signal per electrode. In case it is required to determine which of the electrodes has lost its contact, a sequence of test signals is generated by the sequencer 24 b. The response signal from the electrodes 29, 29 a is forwarded to the input filter 26 , which is preferably also used for a normal signal analysis. The signal from the input filter 26 is directed via the input impedance 25, 25 a to the input amplifier 28 . The amplified response signal is forwarded to the signal processing means 30 which is arranged to analyze the response signal. Preferably, an amplitude analysis is done. The signal from the signal processing means 30 is supplied to the analog-to-digital converter (ADC) 32 after which a digital processing of the response signal is carried out by means of a further processing unit 34 . In case the further processing unit 34 determines that the integrity of the contact is below the allowable level, the lead-off indicator 36 is actuated.
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