Abstract: An apparatus and method of determining the ratio of an amplification factor before and after changing the amplification factor of a signal normalizer that amplifies the voltage amplitude of signals input from a signal generator so that it stays within a predetermined range, and an alternating-current voltage determination device, including, reversing the phase relationship so that said sine-wave signals are negated, the output voltage amplitude of the signal generator stays within a predetermined range and the step wherein the changing the amplification factor of the signal normalizer and the output voltage amplitude of the signal generator so that they are inversely proportional and a difference is obtained between the output voltage amplitude of the signal normalizer before and after the change.

Abstract: A method of determining the ratio of the amplification factor before and after changing the amplification factor of a signal normalizer that amplifies the voltage amplitude of signals that are input from a signal generation means so that it stays within a predetermined range and outputs that voltage amplitude by using a signal generation means, which adds two sine-wave signals of the same frequency and voltage amplitude to form the output and controls the output voltage amplitude at any phase relationship between said two sine-wave signals by a phase control means, and an alternating-current voltage determination means, includes:

Abstract: A transformer apparatus which can reduce a switching noise current flowing between a primary side ground and a secondary side ground is provided. The transformer apparatus includes a first core having a first primary winding wound around the first core, and second core having the substantially same structure as that of the first core, and having a second primary winding wound around the second core. The second primary winding is connected in parallel to the first primary winding. The transformer apparatus further includes a third core having a secondary winding around the third core, which is entirely and electrostatically shielded by a first conductor housing. The third core is arranged so as to be sandwiched between the first and second cores via first and second electrostatically shielding disks electrically connected to a second conductor housing.

Abstract: A measuring circuit obtains desired characteristic values of a device under test by accurately measuring a voltage and a current. Errors are eliminated that originate from the transmission characteristics of cables used in measurements at high frequencies and measurements using long cables. The errors are eliminated by connecting resistors that are equal in resistance to the characteristic impedance of cables, to the inputs of the cables which connect the device under test to a measuring device.