The performance of AC spark tester, an important cable machinery, has direct influence on the accurate compliance with quality requirements and reliability.

The paper,by the theoretical analysis and calculation for the discharge time and the strike fire interval of IEC spart test device of the resistance-capacitance circuit,finds out the cause of the low sensitivity and approaches a new way to test ɑnd prove the capacitive circuit,in the prerequisite of no affect on the performances of the IEC spark test device.

With regard to factory inspection, the article demonstrate test equipment, test voltage, functional check, Calibration and the way to handle non-conforming products of Spark test in CCC and VDE Product certification.

So it is necessary for us to design a computer-based control system of power frequency testing transformer.

This paper discusses a feasibility that,for increased safety brushless excitation synchronous motors, non sparking test is carried out by using the sudden short circuit method of generator when the motor runs inertially for replacing the no load full voltage starting.