Abstract: A laser power and energy meter has a target surface provided with at least one pin hole for passing a small portion of the laser beam impinging thereon and further has a light detector positioned in the path of the laser light passing through the pin hole. The target surface is moved horizontally and vertically to cause the laser beam to scan the target surface and the center of the laser beam is aligned with the center of the target surface.

Abstract: In a loop type standard magnetic field generator comprising loop within which a transmission line having an inner conductor and an outer conductor is coaxially provided and an oscillator for feeding a signal to the loop through the transmission line, the magnetic field strength at a given point is obtained, irrespective of the signal frequency, from the indicated value of an indicator connected to the loop via the transmission line and an element connected thereto, by choosing the length of the transmission line and/or the impedance of the element so that the frequency characteristic of the ratio of the indicated value of the indicator to the electric current flowing through the loop is cancelled by the frequency characteristic of the ratio of the electric current flowing through the loop to the magnetic field strength at the given point to thereby make the frequency characteristic of the indicated value of the indicator and the magnetic field strength constant.