Vehicular automatic capacitance and inductance tester

The invention discloses a vehicular automatic capacitance and inductance tester comprising a multi-winding transformer and a clamp type current sensor. The transformer provides multiple measuring voltages for selection during measuring, and measuring range can be automatically switched according to size, capacitance and inductance of test samples during measuring. A current clamp can measure the test samples in a tested sample unit without detaching connection wires among tested samples. An instrument measures current flowing through the test samples, voltage applied on the test samples, frequency of the voltage and the current applied on the test samples, and relation between amplitude and phase angle can be obtained by analyzing acquired voltage and current through Fourier algorithm by a synchronous current sampling method. According to advance and lag relation between the voltage and the current, whether the tested samples are capacitive, or resistive or inductive or not can be given, and corresponding tes