So I have been trying to understand ABC and ACB rotation relative to CW or CCW rotation and which is positive degrees and which is negative in degrees and if lagging is considered positive or negative direction as well. I did find this website http://www.marcspages.co.uk/pq/3120.htm that helped explain it but it talks about two different standards. Does anyone know or have a good explanation of this and what standard is used for the test?