| 摘要 |
The proposed device for measuring resistance of soil contains an accumulator power-supply source, a measuring amplifier, input electrodes, measuring electrodes, a digital displaying unit, an oscillator, a synchronous detector, a microprocessor control unit, a controlled current source, a low-pass filter, an analog-to-digital converter, an antenna, and a drive for the antenna. The measuring electrodes are connected to the corresponding inputs of the amplifier. The output of the oscillator is connected to the timing input of the synchronous detector and the first input of the current source. The input electrodes are connected to the corresponding outputs of the current source. The output of the amplifier is connected to the signal output of the synchronous detector. The output of the detector is connected to the input of the control unit via the filter and the analog-to-digital converter, which are connected in series. The input of the antenna drive, the input of the displaying unit, and the control inputs of the current source and amplifier are connected to the corresponding outputs of the control unit.
|
