| 摘要 |
A battery tester including an automatic battery loading device includes a carbon pile having a shaft therethrough and a stepper motor engaged with the shaft for effecting rotation thereof. A compression nut is threadedly engaged with the shaft for movement into and out of engagement with the carbon pile in response to rotation of the shaft for varying the compression of the pile and, thereby, the impedance thereof. A feedback resistor is connected in series with the carbon pile across the battery and a control circuit compares the voltage across the feedback resistor with a voltage corresponding to a predetermined load current for controlling the operation of the motor to maintain the predetermined load current. Suitable meters indicate battery voltage, actual load current and predetermined load current. |
