| 摘要 |
A device for automated determination of the values range of measured electric resistance includes measured electric resistance R, set of resistors R-Rand set of switches k-k, where n – number of sub-ranges of measured value of electric resistance, at that the first inputs of the resistors R-Rare connected to each other, and the second inputs – to the inputs of respective switches k-kAdditionally it includes reference electric resistances Rand R, differential amplifier, circuit for separation of voltage module, analog demultiplexer ADMX, n peak detectors, circuit for determination of minimal voltage with determination of the number of conductor and control block, at that the first inputs of the resistors R-Rare connected to the first input of the reference electric resistance R, and the second inputs of the switches k-kare connected to respective outputs of the control block, and the third inputs of the switches k-kare connected to each other, to the first input of measured electric resistance Rand second input of differential amplifier the first input of which is connected simultaneously with the second input of reference electric resistance Rand the first input of reference electric resistance R, the second input of that one is connected to the second input of the measured electric resistance R, and the output of differential amplifier is connected to the input of the circuit of separation of voltage module output of which is connected to the input of analog demultiplexer ADMX, the outputs of that one are connected to the first inputs of respective peak detectors the second inputs of which are connected to each other and to respective output of the control block, and the outputs of the peak detectors are connected to respective inputs of the circuit for determination of minimal voltage with determination of the number of the conductor. |
