Excerpted from another thread on this site:
" One thing that you need to be careful of is that you likely have several pieces of equipment, the scope, a power supply or three, a function generator, a computer or network connection, and it is very likely that more than one of these is earth-referred in some way. You need to ensure that these are all compatible. For instance, if your power supply is 12 Vdc and you split it on your board to get +/- 6 V supplies with an artificial "ground" midway, then if that 12 V supply is not floating and you connect your scope probe's ground clip to the circuit "ground" you will be in for a surprise. "
I'm wondering if anyone can clarify (or confirm the truth of) the last statement in this quote. I am as aware as I can be (at this point in my journey) of what can go wrong vis-a-vis improper scope probe grounding, but wouldn't the mid-point of the split supply be 0 volts?
Moreover, if the 12V supply is NOT floating, would it not then be at the same potential as the other earth ground in the circuit?
" One thing that you need to be careful of is that you likely have several pieces of equipment, the scope, a power supply or three, a function generator, a computer or network connection, and it is very likely that more than one of these is earth-referred in some way. You need to ensure that these are all compatible. For instance, if your power supply is 12 Vdc and you split it on your board to get +/- 6 V supplies with an artificial "ground" midway, then if that 12 V supply is not floating and you connect your scope probe's ground clip to the circuit "ground" you will be in for a surprise. "
I'm wondering if anyone can clarify (or confirm the truth of) the last statement in this quote. I am as aware as I can be (at this point in my journey) of what can go wrong vis-a-vis improper scope probe grounding, but wouldn't the mid-point of the split supply be 0 volts?
Moreover, if the 12V supply is NOT floating, would it not then be at the same potential as the other earth ground in the circuit?