| 摘要 |
An electronic stimulator contains the programmable digital generator of the squared pulses with constant amplitude, the indicator unit, the input of the external synchronization, the keyboard, and the amplifier of the input signal with amplitude control. Furthermore, the device contains the electronic voltmeter with measurement range from 0 to 9.99 V, the interchanging switch with two sets of switching contacts. One position of the contacts provides for the connection of the amplifier input with generator and the output with the load, while the other position of the contacts provides for supplying the input with the reference voltage equaling the pulse amplitude of the generator and the output is connected with the electronic voltmeter. The device also contains the remote start button. The amplitude control of the output signal is designed as two variable resistors connected in series. One resistor is incorporated in potentiometer circuit for the coarse control of the signal amplitude, while the other resistor is incorporated in rheostat circuit for the fine adjustment. In the circuit of the amplifier unit, the feedback link is designed as the voltage-ratio divider with wafer-type switch allowing for incorporation of the resistors of various nominal values. The keyboard contains one shared key with four crossed buttons. |
