What does the CMV (Contact Making Voltmeter) measure in a distribution step regulator?

The Contact Making Voltmeter (CMV) is specifically designed to measure the output voltage from components like distribution step regulators. Step regulators are used in electrical distribution systems to maintain a constant voltage despite fluctuations in the load or input voltage. By using a CMV, linemen can assess the actual voltage level being delivered downstream to ensure that it meets operational requirements and standards.

Measuring the output voltage is crucial for system performance and reliability, as it directly affects the quality of power supplied to consumers. A correct reading helps in determining if adjustments are needed or if further investigation is warranted to address voltage issues.

The other options do not accurately reflect the primary function of a CMV. It does not measure the input voltage, the amount of current flowing, or contact resistance directly. Instead, its focused purpose is to assess the voltage across the regulator’s output contacts to verify proper functioning.