DIGITAL CLAMP METER AND AUTOMATIC MEASUREMENT METHOD THEREOF

摘要

A digital clamp meter includes a common input, a voltage/resistance input, a current transformer, a voltage/resistance measuring circuit, an AC measuring circuit, a MPU and a displayer. A detecting input of the voltage/resistance measuring circuit is connected to the voltage/resistance input, a detecting output of the voltage/resistance measuring circuit is connected to a signal input of the MPU, and a controlled terminal of the voltage/resistance measuring circuit is connected to a controlling output of the MPU. The signal output of the MPU is connected to the displayer. The common input is grounded. A detecting input of the AC measuring circuit is connected to a secondary winding of the current transformer, a detecting output of the AC measuring circuit is connected to the signal input of the MPU, and a controlled terminal of the AC measuring circuit is connected to the controlling output of the MPU.

主权项

1. A digital clamp meter, comprising:
a common input; a voltage/resistance input cooperating with the common input for inputting voltage to be measured or resistance to be measured; a voltage/resistance measuring circuit for detecting and processing the voltage to be measured or resistance to be measured; a current transformer for induction detecting when the measured signal is alternating current; an AC measuring circuit for detecting and processing induction current generated in a secondary winding of the current transformer; a displayer for displaying values of measured voltage, resistance or alternating current; and a MPU for controlling working of the voltage/resistance measuring circuit and processing outputting signal of the voltage/resistance measuring circuit, controlling the displayer to display value of measured voltage or resistance, controlling working of the AC measuring circuit and processing outputting signal of the AC measuring circuit, and controlling the displayer to display measured AC value; wherein a detecting input of the voltage/resistance measuring circuit is connected to the voltage/resistance input, a detecting output of the voltage/resistance measuring circuit is connected to a signal input of the MPU, and a controlled terminal of the voltage/resistance measuring circuit is connected to a controlling output of the MPU; the signal output of the MPU is connected to the displayer; the common input is grounded; a detecting input of the AC measuring circuit is connected to the secondary winding of the current transformer, a detecting output of the AC measuring circuit is connected to the signal input of the MPU, and a controlled terminal of the AC measuring circuit is connected to the controlling output of the MPU.