A 10 ampere Digital Low Resistance Ohmmeter is sufficient for many low resistance measurement applications. However, industry standards and guidelines will recommend, if not require a minimum of a 100 amps DC source when evaluating connections relating to medium and high voltage power system apparatus. Very small changes in contact resistance can have significant impacts on these apparatus in terms of how they perform in service. The use of higher current helps in the precision of the measurement and is therefore preferred when evaluating connections in higher voltage applications.
One of the most commonly used high current digital low resistance Ohmmeters is the Vanguard Auto-Ohm 100 100A Micro-Ohmmeter. This test set features a resistance range of 1 micro-Ohms to 300 milli-Ohms. Its output current can be adjusted from 10 amperes to 100 amperes depending on the application. A selectable current output makes this test instrument ideal for measurements in a much broader range of applications. Its powerful microprocessor gives you fast and accurate results. It has an automatic mode which makes it ideal for testing multiple resistances in a circuit breaker. Results can be directly taken from its back-lit LCD screen which is viewable even in bright conditions. You also have the option to change test leads to accommodate varying sizes of components to be tested.
The Vanguard Auto-Ohm 100 is available for rent from Protec. Choose from a wide range of Vanguard test equipment and other high voltage test equipment from popular brands.
Related electrical test equipment available for rent from Protec:
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Editor’s Note: This post was originally published March, 2011 and has been updated freshness, accuracy and comprehensiveness.