How does a meggar make 1000v from a 9v battery?

A megger, or insulation resistance tester, uses a small DC voltage (like 9V) from its battery and amplifies it through an internal circuit using a high-voltage generator. This generator converts the low voltage into a much higher output, often around 1000V, to test insulation resistance in electrical circuits. The process involves transforming and boosting the voltage while ensuring safety and accuracy for testing purposes.