A New Device for Measurements of Pulses or High-Frequency Currents

Resistors are frequently used for measuring waveforms and magnitudes of pulse currents, assuming that the effect of residual inductance of the resistors is very small. However, when the very high-frequency components of the current must be taken into account, the effect of the residual inductance cannot be neglected. In this paper, a new current measuring device with a resistor of a special type is described. It is so constructed that the effect of residual inductance does not appear in the observing circuit of the device. Consequently, the voltage observed becomes exactly the product of the resistance of the device and the current to be measured, flowing through the device. As the effect of the residual inductance of the device does not appear in the observing circuit, the resistance of the device can be made very low, consequently, the circuit condition will be practically undisturbed by the connection of the device.