Generator rectified voltage waveform
I - the generator is working; II - the valve is broken; III - break in the valve circuit
The oscilloscope allows you to accurately and quickly check its serviceability and determine the nature of the damage by the shape of the rectified voltage curve of the generator.
To check, rotate the generator rotor at a frequency of 1500–2000 min–1, feeding the excitation winding from the battery, but from the clamp «30» disconnect the battery.
With serviceable valves and the stator winding, the rectified voltage curve has a sawtooth shape with uniform teeth.
If there is an open in the stator winding or an open or short circuit in the rectifier valves, the shape of the curve changes dramatically: the uniformity of the teeth is disturbed and deep depressions appear.