To test a relay coil out-of-circuit, which measurement would be taken?

To test a relay coil out-of-circuit, measuring the resistance of the coil is the best practice. This measurement helps determine if the coil is intact and functioning properly. When the relay is disconnected from the circuit, measuring the resistance ensures that the winding is not shorted or open. A low resistance reading typically indicates that the coil is functioning and can energize when voltage is applied. Conversely, an infinite or very high resistance suggests that the coil has failed, often due to a break in the winding.

Voltage and current measurements are not suitable for testing in an out-of-circuit scenario because these measurements require the circuit to be live and may not accurately reflect the coil's condition without the influence of other components. The active switch position does not provide any direct information about the relay coil's functionality, as it merely indicates whether the relay is supposed to be engaged or not, without confirming the condition of the coil itself.