Is it true that a circuit must be disconnected to use a clamp-on ammeter?

Using a clamp-on ammeter allows for the measurement of current without the need to disconnect or break the circuit. This unique capability is achieved by incorporating a current transformer within the clamp that senses the magnetic field produced by the current flowing through the conductor.

By simply clamping the device around the conductor, the ammeter can accurately measure the amount of current without any interruption in the circuit. This is particularly advantageous in situations where disconnecting the circuit is impractical or poses safety concerns.

Some other options suggest specific conditions under which disconnection might be necessary, but in all cases, a clamp-on ammeter is designed for direct, non-intrusive measurements that do not require the circuit to be open. Therefore, the assertion that a circuit must be disconnected to use a clamp-on ammeter is false.