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AEGIS® Bearing Protection - Why Shaft Grounding?

 

Shaft Voltage Testing

         

 

Setting the ScopeMeter Parameters

An EDM discharge pattern will show a climb in voltage and then a sharp vertical line. The sharp vertical line shows the moment of discharge to ground. To get a good image of a discharge, you may need to adjust the display scale.

Control the vertical scale of the displayed signal by adjusting the volts per division. The entire signal, from peak to peak, should all be displayed on the screen. 5V is a good place to start, and then adjust up or down based on the conditions. The setting selected in volts per division is shown in the lower left of the screen.


Amplitude will need to be adjusted according to the conditions.

Set to show complete wave from top peak to bottom peak using the scale buttons.

In this example the amplitude is too small. Increase the range (mV) to show more detail.

In this example the amplitude is too large. Decrease the range (V) to show top and bottom peaks.


Setting Time Period

Control the horizontal scale of the displayed signal by adjusting the time scale. 500μs (microseconds) is a good place to start and then adjust the time based on the conditions. The selected seconds per division setting is shown at the bottom center of the screen. The EDM wave forms are best displayed at a setting of 50us/div or less. Adjust the time setting to show the desired waveform.


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