Describe the purpose of a phase rotation meter.

A phase rotation meter is specifically designed to determine the phase sequence of three-phase electrical systems. In a three-phase system, the order in which the phases reach their maximum voltage is critical for the proper functioning of electrical equipment. This order, known as the phase sequence, affects the direction of rotation of motors and other rotating electrical devices.

If the phase sequence is incorrect, it can lead to motors running in the wrong direction, which may cause operational issues, equipment damage, or safety hazards. The phase rotation meter provides a straightforward way to confirm the correct sequence by connecting to the three phases and indicating their order.

The other choices relate to different electrical parameters: measuring electrical resistance is important for assessing circuit integrity, testing voltage output of generators ensures they are functioning correctly, and evaluating insulation quality pertains to safety and reliability of conductors. However, none of these aspects are the focus of a phase rotation meter, which is solely dedicated to analyzing phase sequence.