Can anyone explain how to measure the insulation resistance of an isolated SMPS PCB?
Is it correct to tie ACL and ACN and apply one terminal there, and the second terminal goes to the ground of the secondary part of the circuit? or Do I need to test between ACL-ACN, ACL-Secondary Ground, ACN-Secondary Ground? Do I need to test ACN-to the plastic enclosure of the PCB as well, or is it only needed for AC Dielectric Withstand Test?
I am using Farnell's brand Megohmmeter(looks like rebranding from uni-t)