| 摘要 |
PROBLEM TO BE SOLVED: To electrically detect the soldering of an IC terminal at a high speed. SOLUTION: A tuning type sensor coil provided with a sensor coil formed by winding a plurality of conductive coils on a cylindrical bobbin formed of a magnetic material core such as ferrite or the like having a diameter conformed to the outer dimension of an IC and a capacitor connected to the output end of the sensor coil, is set on the IC. A means for applying an AC (sine wave, pulse, etc.), signal to a measuring terminal in the IC grounded except the measuring terminal to detect the magnetic field generated by the current carried to a protective diode within the IC by the tuning type sensor coil set on the IC is given to all the IC terminals. The propriety is judged by the comparison with a preliminarily stored reference value for non-defective IC.
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