Quote:
Originally Posted by Don_Zalmrol
After 30 minutes of testing it with a small wave gen the scope suddenly gave a bang sound and the power to the apartment was out. Seems my RCD blew out.
Thanks for any tips!
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The RCD generally only gets tripped when there is an unbalanced current (leakage to earth) from the mains input wiring. This was the big clue, along with the burning smell, that the Rifa caps on the mains input wiring were leaking to ground. Very common for these as they age. You don't want to increase their uF value too much as from the AC perspective they will tend to try to suspend the chassis at 1/2 the supply voltage, and will pass a small current to earth for that reason.