DIAGNOSING HEATING SYSTEMS WITH OHMMETERS

An ohmmeter is a device that measures electrical resistance. It may do so using a micro-ohmmeter for low resistance or a megohmmeter (or Megger) for greater resistances.

Ohms are the unit of measurement an ohmmeter uses. Named for German physicist Georg Ohm, this unit is the electrical resistance between two points with one volt of constant potential difference. Ohm’s law states, “the current through a conductor between two points is directly proportional to the voltage across the two points.”

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