GLOW PLUG INSPECTING METHOD, GLOW PLUG MANUFACTURING METHOD, SHEATHED HEATER INSPECTING METHOD, AND SHEATHED HEATER MANUFACTURING METHOD

摘要

The present invention certainly suppresses an error of an internal conductor (heating element) by applying a high voltage to the internal conductor (heating element) in a short time and increases a detection precision degree of a short circuit error. When a high voltage higher than that of an applying voltage of a common use is applied to an internal conductor (3) {Coil body (31)} in a short time capable of suppressing the temperature rise of the internal conductor (3) {Coil body (31)} caused by the application of the high voltage, a short circuit error between an external arranging body (2) and the internal conductor (3) {tube (21) and coil body (31)} is detected based on a value changed by a current flowing in the internal conductor (3). Therefore, the present invention can suppress an error of the internal conductor (3) {Coil body (31)} and can increase the detection precision degree of the short circuit error. Also, the detection precision degree can be further improved because the high voltage is applied.