INSTRUSMENT FOR MEASURING THREE-DIMENSIONAL CHARACTERISTIC OF LIGHTING FIXTURE AND ACOUSTIC DEVICE

PURPOSE:To accurately stop a light source to be measured even at a extremely small angle while the light source is rotated so as to obtain highly accurate data by measuring the luminance of the light source by horizontally and vertically rotating a fitting plate a fixed angle by fixed angle. CONSTITUTION:After a horizontally rotating motor 2 which rotates about 150 deg. is fixed on the upper surface of a frame 1, a horizontally rotating pedestal 3 is put on the rotating shaft of the motor 2. A vertically rotating motor 5 which rotates 360 deg. is fitted to the side face of a vertical frame 4 provided on the upper surface of the pedestal 3 and the central part of a fitting plate 6 for object to be measured is fixed to the rotating shaft of the motor 5. And, a lighting fixture which is an object to be measured is fitted to the plate 6. Thereafter, the motors 2 and 5 are rotated and controlled to stop at every 1 deg. by actuating the motor controlers 11 and 12 of the motors 2 and 5 in accordance with a command 13, to which measuring conditions are previously inputted and, whenever the motors 2 and 5 are stopped, the luminance of the fixture is measured with an illuminance meter 10. Thus, the luminance of the fixture is measured over 150 deg. in the vertical plane and 360 deg. in the horizontal plane at every 1 deg. and the output signals are inputted 14. Therefore, highly accurate measurement data can be obtained, because the fixture can be accurately stopped even at an extremely small angle.