RL
Not sure what you meant by your last comment.
I was just trying to say that the QA-90 is more flexible than other older safety testers in that there is a separate earth connection, separate enclosure connection and a further ten separate applied parts connections on the tester itself.
It could be that on some devices you would have the enclosure lead connected to a part of the device where no patient contact would apply and applied parts leads to other parts of the device where the patient is likely to touch.
Mark
