| 摘要 |
PURPOSE:To decrease the adjusting processes of a CT detecting circuit and to preclude misadjustment by connecting a light emitting diode for the conformation of voltage adjustment to the output board of a microcomputer. CONSTITUTION:An AC current detected by a CT 16 is inputted to the port of the A/D converter of the microcomputer 1 through a full-wave rectifier 15, a smoothing capacitor 4, and a semifixed resistor 5. A DC power source, on the other hand, is connected to the reference voltage port of the A/D converter of the microcomputer 1 as a reference voltage for the A/D converter. Then when the voltage is adjusted, a prescribed current is supplied to the CR 16 to vary the resistance value of the semifixed resistor 5. Consequently, the input voltage to the microcomputer 1 varies and when the data value of the microcomputer 1 reaches a specific value, the light emitting diode 3 illuminates and adjustments for the current detection of the CT 16 are finished.
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