The noise of capacitors have become a focus of users and suppliers

the excitation equipment used currently has large volume

rated power and high cost. A new type of excitation method is described in this paper. By applying.DC voltage and AC voltage together on a capacitor

it can generate the noise equivalent to the full-current method

which can be used in researching or noise estimating. The equipment for this method is much smaller

and its rated power and cost can be reduced more than 80%

the test results do not appear unacceptable differences compared with full-current method.