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 the 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 amplitude and phase of the current in the standard circuit and the test circuit are respectively measured. Then, using a microcontroller with digital real-time acquisition methods 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