| 摘要 |
PURPOSE:To automatically inspect the quality of a coil to be measured at a high accuracy by determining by comparison whether or not a voltage vibration waveform thereof is within the allowable range of a reference one. CONSTITUTION:After a coil to be measured is set at a setting section 3, an accepted product data intake designating switch 16 is turned OFF and a data memory circuit 14 is made ready for reading to send out a reference voltage vibration waveform A of an accepted coil memorized in the memory circuit 14 to a standard value setting discriminator circuit 15 through a three-state buffer circuit 13. On the other hand, a high voltage pulse is applied to the coil being measured to obtain a voltage vibration waveform B thereof which is converted into a digital signal sequentially through a sample hold circuit and an analog- digital conversion circuit 6 and sent to the standard value setting discriminator circuit. In the circuit 15, the voltage vibration waveform B of the coil being measured is compared with the reference voltage vibration waveform A every sampling and the number of the detection points exceeding the voltage vibration waveforms A1 and A2 respectively as the upper and lower limits in the allowable range is counted. |
