I understand the values of Vsg and Vsp in the aspect of a troubleshooting tool when encountering various issues such as certain ID sensor codes, copy quality issues, drum surface condition.... I also understand Vsg is the sensor looking at the Bare Drum and Vsp is the sensor looking at a patch applied to the drum.
But what I would like to know is EXACTLY what Does the 3 letters of each of the 2 mean?
But what I would like to know is EXACTLY what Does the 3 letters of each of the 2 mean?

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