News Details

Working Principle

Under the action of AC voltage, the dielectric consumes a portion of electrical energy, which is converted into heat energy and causes loss. This energy loss is called dielectric loss. When an AC voltage is applied to a dielectric, there is a phase angle difference Ψ between the voltage and current in the dielectric. The complementary angle δ of Ψ is called the dielectric loss angle, and the tangent of δ, tgδ, is called the dielectric loss tangent. The tgδ value is a parameter used to measure dielectric loss. The instrument's measurement circuit includes a standard circuit (Cn) and a test circuit (Cx). The standard circuit consists of a built-in high-stability standard capacitor and the measurement circuit, while the test circuit consists of the test object and the measurement circuit. The measurement circuit is composed of a sampling resistor, a preamplifier, and an A/D converter. Through the measurement circuit, the amplitudes and phases of the current in the standard circuit and the test circuit are respectively measured. Then, using a microcontroller with digital real-time sampling and vector operations, the capacitance value and dielectric loss tangent of the test object can be obtained.

The instrument has built-in anti-interference measures to ensure accurate measurement under external electric field interference.

Technical Parameters