The following circuit is a discrete topology I have implemented on a strip-board to obtain +/-12V split supply from a regulated 24V single supply(V1 in the schematics):
Now V1 is not battery but a power supply SMPS or most likely a lab power supply. I want to observe the split voltages +V and -V by using a scope.
My question is does this way of split supply requires any precaution? Does V1's negative terminal needs to be isolated from the earth ground? In my case both the lab supply(V1) and the scope will be earth grounded. Am I violating something here? It seems to me V1 should not be earth grounded. Is there any other precautions for this circuitry?