Packag ed into a portable test system for use by apparatus manufacturers, rebuild shops, and electrical maintenance crews, the Raytech Micro-Centurion II has an easy to use operation screen, which allows quick selection of the current level and resistance level to be measured. The system has the ability to detect the resistance level and suggest the correct range to select which provides for extremely accurate results.
Micro ohm meters are devices that allow technicians to accurately measure junction resistance of conductors like circuit breaker contacts, bus bar connections and electrical terminals. An ordinary Ohmmeter won’t do because it doesn’t have a compensation circuit that isolates the lead resistance from the sample. Also, the range of ordinary Ohmmeters is limited which may give false readings.
Winding resistance of transformers is a good indicator of transformer condition. Developing defects like corroded terminal connections, inter coil shorts and core to coil shorts can affect the resistance of the windings. However, you can’t just use any Ohmmeter to measure coil resistance of distribution transformers. You must use a device that has enough current to pass through the thick windings and has protective measures to reduce the incidence of inductive kickbacks.