why use an isolation transformer with an oscilloscope?

Using an isolation transformer with an oscilloscope is essential for safety and measurement accuracy. It isolates the oscilloscope from the mains supply, preventing ground loops and reducing the risk of electric shock. This isolation allows for accurate voltage measurements without interference from the power source. Additionally, it protects the oscilloscope and the user from high voltages present in the circuit under test, ensuring safe operation during diagnostics and troubleshooting.