An electronic device that measures electrical resistance, ohmmeters come with different levels of sensitivity; some are designed to measure low-resistance materials, while others measure higher resistance.
An ohmmeter functions by passing a constant current or voltage though an object, such as voltage from a battery, and then measuring the resulting current with an ammeter after it passes through the resistance. The higher resistance the material has, the less current will pass through it. An ohmmeter is typically not used to measure resistance across an entire circuit, but rather through different parts of the circuit, although it can be used to test that a circuit is not broken. Components of a circuit can be removed and tested individually for resistance.
For all your low-resistance measuring needs, Protec carries a full catalog of testers, from all of the top manufacturers.
The 10A Micro-Ohmmeter, the AEMC 6250 is a rugged, low resistance tester designed for both plant maintenance and field use.
The Megger DLRO10HD Digital Low Resistance Ohmmeter (DLRO) combines simplicity of operation with a rugged IP65 case designed for stable ground and bench operation.
The Megger DLRO200-115 Digital Low Resistance Ohmmeter measures contact resistance in high voltage circuit breakers, disconnecting switches (isolators), busbar joints, or for any other low resistance measurement.
The Raytech Micro Centurion II 200A Precision Micro Ohm Meter was designed for a high degree of accuracy for the measurement of very low resistance.
The Auto-Ohm-200 S3 Ampere Micro-Ohmmeter is Vanguard’s fourth generation, microprocessor-based, true DC micro-ohmmeter.