摘要 |
PURPOSE:To make it possible to measure a plurality of test pieces by single operation, by attaching a plurality of holders to a common rotary shaft at predetermined intervals and mounting a plurality of test pieces to respective holders in a radius direction or at a required phase angle in a rotary direction. CONSTITUTION:A plurality of test piece holders 26 are fixed to the rotary shaft 30 in a cylindrical air-core solenoid 10 so as to leave a predetermined distance therebetween and a plurality of ferromagnetic test pieces are mounted to respective holders 26 in a freely detachable manner in a radius direction or at a required phase angle in a rotary direction. The same number of detection coils 28 as the number of the test pieces attached in the radius direction are fixed in opposed relation to the respective holders 26. Thereafter, a coil 12 is excited to magnetize the test pieces and the holders 26 are subsequently rotated by a motor 36 and voltage induced in the coil 28 is detected to measure the coercive force of each test piece. |