What is the measurement principle of clamp earth resistance tester?
Current measurement principleThe measuring principle of clamp resistance instrument is connected with a current measurement principle and current transformer of the same. The AC current I of the measured wire, through the jaw of the current, magnetic ring and the current coil to produce an induced current I1, the caliper meter to measure the I1, through the following formula can be measured current I.Product characteristics:1 、 large jaw design, suitable for all kinds of ground wire2 、 non-contact measurement of grounding resistance, safe and fast3 、 on-line test, without interrupting the grounding of the equipment to be tested4 、 anti-interference ability, self-produced high-frequency current, thus filtering the 50Hz, 100Hz and other harmonic interference current in the city, the accuracy of measurement is high5 、 configure rechargeable batteries and chargers, power saving design, automatic power-off over the specified time, battery limit alarm function6 、 digital measurement, automatic shift, easy to operate
Resistance measurement principleA grounding resistance measurement of grounding resistance is the basic principle of measuring loop resistance. Jaw of clamp tableThe clip on earth resistance testerIt is composed of voltage coil and current coil. The voltage coil provides an excitation signal and induces an electric potential E on the circuit under test. Under the action of the potential E, the current will be generated in the tested circuit I. The clamp meter measures the E and I, and the measured resistance R is obtained by the following formula.
