What is the best tool for checking the windings of a compressor?

Using a megger, or mega-ohm meter, is the best choice for checking the windings of a compressor because it is specifically designed to measure the insulation resistance of electrical components, especially in high voltage applications. This tool applies a high voltage (typically 250V to 1000V) to the windings and measures the resistance in mega-ohms. This helps determine the integrity of the insulation and can identify potential insulation failures that could lead to short circuits or electrical leaks. A good insulation resistance value indicates that the windings are in proper condition and can operate safely and effectively.

Other tools, while useful for various tasks, do not serve this specific purpose as effectively. A digital multi-meter can measure resistance but typically operates at lower voltages, which may not accurately assess the condition of the compressor’s windings under operational conditions. A hermetic analyzer is primarily designed for testing the entire hermetic sealing and operation of the compressor. A digital scale, like the Yellow Jacket digital scale, is used for measuring refrigerant weights and does not provide information relevant to the condition of the windings.