I have 1 black screen

Hi, sorry asking newbie qn. But i am currently trying to measure the oscillation of a Fluoresecent Lamp running on 220V AC power. I've used a voltage divider setup to step down the voltage to less then 5V. However, is it advisable to measure a 220V source?

Moreover, i hadnt connect the AC to my board circuit yet, and i am getting a plain dark screen from Sketc_nova when i run the codes. Is that suppose to happen?

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