I was watching Dave Jones video and he mentioned something I dont understand.I think he said that when the scope is in 1M ohm setting,then electromagnetic interference starts coupling with the probes,that they will act as antenas.
Is it true that oscilloscope is more susceptible to interference when set to 1 mega ohm than in 50 ohm mode?
There are all kinds of intereference,magnetic,capacitive,electromagnetic ( photons ),I am not sure what type he had in mind,he said something about led lights,I guess thats RF photons?
Why is there more interference at 1 M ohm setting? Free space have 377 ohm impedance,that should transfer more power to 50 ohm terminated scope.
Isnt coax cable supposed to have shielding as standard? Then it should be imune to interference,except the magnetic type unless it have mu metal shield