First of all, Thanks for replying, and I will buy that isolator for pc, and as of now I'm powering it and getting readings on tablet and load is not ground referenced so will I still have to pay attention to test ckt like ,if now I connect a rectifier to it will it be ok, since it is powered by tablet's battery
And one more doubt for example I'm powering oscilloscope with PC and I'm analysing a battery powered device(floating) and I accidentally connect the ground lead to positive side and probe to ground, will it gonna blow up