When must the oscilloscope probes be disconnected?

The requirement to disconnect oscilloscope probes after power is removed from the circuit is crucial for ensuring safety and preventing damage to both the equipment and the user. When the power is still applied to the circuit, the probes can carry dangerous voltages which could lead to electrical shock or short-circuiting, potentially damaging sensitive electronic components.

Disconnecting the probes only after the power has been neutralized reduces the risk of accidental contact with live circuits. This practice not only adheres to safety standards but also promotes a systematic approach to working with electronic diagnostics and repairs. While it is important to ensure that measurements are completed, settings are appropriately changed, and results are interpreted, these actions can occur while the probes are still connected and power is on, depending on the specific circumstances and precautions taken. Therefore, the emphasis on disconnecting the probes only after power is removed reinforces best practices regarding safety in the workplace.