JPH0554075B

PURPOSE:To detect a short-circuiting for each pole properly in a multipolar type coil by connecting a high frequency oscillator to the coil to be checked for the presence of short-circuiting to generate and detect a magnetic field. CONSTITUTION:A high frequency oscillator 6 is connected to a multipolar type coil 10 to be detected. The high frequency oscillator 6 preferably uses 100kHz- 1MHz. A high frequency current flows to the multipolar coil 10 to generate a magnetic field. As a detection coil 7 or the detection coil 7 and a resonator of a capacitor 9 approaches the magnetic field, a voltage is generated to be detected with a voltometer 8. Here, when a short-circuiting occurs even in one pole of the multipolar type coil 10, the generation of the magnetic field becomes weak to lower the detection voltage 8. Thus, since a high frequency current flows through the multipolar type coil and a resonator approaches the magnetic field generated to measure the voltage, short-circuiting for each pole can be detected properly.