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Low Resistance Ohmmeter

High Current Low Resistance Testing with a 100A DLRO

Vanguard Auto-Ohm100A 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.

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Megger DLROs Built for Reliability


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A low resistance ohmmeter can be used to identify many of the issues that stem from poor electrical connections. Contact resistance is a term used to characterize the quality of an electrical connection. Electrical bonds are a component of everything that requires a connection to an electrical path such as junction boxes,bus work, circuit breakers and switches to name a few.  Poor connections can lead to excessive heating, premature equipment failure and damage to the electrical system itself. A good testing and maintenance program will include a low resistance ohmmeter to ensure the quality of electrical connections. 

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Detect Problems with Electrical Connections using a DLRO

Megger DLRO200-115 200A Digital Low Resistance OhmmeterThe resistance of an electrical connection increases over time due to temperature, cycling, and other environmental stresses. The degradation of these connections can result in excessive losses due to heating and operability issues . Periodic testing of contact resistance and/or other electrical bonds can help to identify changes in the condition of contacts and other electrical connections.

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AEMC Ohmmeters are Available for Rent from Protec

AEMC 6250 10A Micro-OhmmeterOhmmeters are an electronic device that measure electrical resistance, and come with different levels of sensitivity. Some are designed to measure low-resistance materials, while others measure higher resistance. The higher resistance the material has, the less current will pass through it.

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An ohmmeter is typically not used to measure resistance across an entire circuit, but rather through various parts of the circuit, although it can be used to test that a circuit is not broken.

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Rent Omicron’s CIBANO 500 Circuit Breaker 3-in-1 Test System From Protec

Omicron CIBANO 500 Circuit Breaker Test SystemThe Omicron CIBANO 500 Circuit Breaker Test System is a 3-in-1 system capable of testing all types of circuit breakers, medium-voltage or high-voltage circuit breakers with live and dead tank design.



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The CIBANO 500 is a micro-ohmmeter, timing analyzer, and a coil and motor supply all in one device, allowing for all important circuit breaker tests to be carried out even when a station battery is not available.

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For Accurate Low Resistance Measurement Rent the Megger DLRO10HD

Megger DLRO10HD 10A Digital Low Resistance OhmmeterLow resistance measurement is used to determine the condition of joined junctions like circuit breaker and relay contacts and terminals. When these joints weaken, carbon deposits, grease, dirt and other contaminants resulting in the resistance to increase, which in turn causes the junction to not efficiently carry the current, dissipating the power losses as heat. Thus, leading to further deterioration and eventual failure.

Read More »For Accurate Low Resistance Measurement Rent the Megger DLRO10HD