What style of CT are you using, is it a module type with internal electronics like the MicroSwitch or a passive CT with just a secondary and the plasma cable as primary?
A passive type has to be used on AC to get any meaningfull readings and also it is a Current transformer, and should not be used open circuit or lightly loaded, due to excessive high voltages appearing on the secondary, if you have a 15ohm res. as a shunt the secondary current can be calculated by knowing the ratio of the CT.
Al.
__________________
CNC, Mechatronics Integration and Machine Design.
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E. |