| 摘要 |
<p>PURPOSE:To make the observation of a waveform in a high speed possible and to simplify the handling, by connecting a buffer amplifier to the output terminal of an RC integrating circuit which is connected in parallel to a coil which detects the variance of the magnetic field generated by a current to be measured. CONSTITUTION:When a pulse large current (i) is flowed, an electromotive force is induced in a coil 1 by the magnetic field generated by the large pulse current, and a voltage is generated between both ends of a load resistance 2. This voltage is integrated by an integrating circuit 5 consisting of a resistance 3 and a capacitor 4 to generate a voltage waveform corresponding to the current (i) to be measured. This voltage waveform is inputted to an oscilloscope through a high-input impedance buffer amplifier 9, load resistance 10, and a coaxial cable 7. Thus, the operation of the integrating circuit 5 is not affected at all even if the coaxial cable 7 is terminated by a terminal resistance 8, and the load resistance 2, the integrating circuit 5, the amplifier 9, an the resistance 10 can be stored in a shield case which is made into one body together with a case incorporating the coil 1.</p> |
