In case of suspecting shorted motor windings, which tool should an operator use for investigation?

Using an ohmmeter is the appropriate choice for investigating suspected shorted motor windings. An ohmmeter measures the resistance of the winding and can indicate a short circuit in the motor. If the motor windings are shorted, the resistance reading may show a very low value, indicating that the winding paths are connected in a way they shouldn't be, leading to a malfunction.

In contrast, a multimeter, while also capable of measuring resistance, is less specialized for this task and may not provide the detailed insight or the focused results that an ohmmeter would deliver specifically for this purpose. An Amprobe, typically used for measuring current in electrical systems, is not suited for evaluating the condition of windings. A clamp meter is designed for measuring current without breaking the circuit and does not assess resistance or the state of the windings effectively. Therefore, the use of an ohmmeter is crucial for diagnosing issues related to motor windings accurately and effectively.