Ohmmeter

Heavy Duty Megger DLRO10HD Digital Low Resistance Ohmmeter Combines Ruggedness and Accuracy

December 10, 2013
DLRO, Megger, Ohmmeter

An ohmmeter is an electronic device that measures electrical resistance, such as that of a circuit component. 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 voltage 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.

Test Resistance with Reliable Megger DLRO10HD Digital Low Resistance Ohmmeter

October 15, 2013
DLRO, Megger, Ohmmeter

It is important to measure low resistance in order to ensure that a device is still within its optimum resistance range.To measure low resistance, a digital low resistance Ohmmeter or DLRO is used. Protective devices and relay contacts are some components often tested for resistance problems, as these components are exposed to vibration, corrosion, electrical and thermal stress. Ideally, the contact points should have a resistance of a few microOhms to ensure maximum transfer of power. When the resistance of relay or circuit breaker contacts increase due to carbon deposition, corrosion and other contaminants, the contact points may heat up during operation. This can cause further degradation of the components and lead to eventual failure.

Megger DLRO10HD Sets the Standard for Digital Low Resistance Testing

October 8, 2013
DLRO, Megger, Ohmmeter

The Megger DLRO10HD 10A Digital Low Resistance Ohmmeter the standard for low resistance testing.

Providing significantly enhanced compliance the Megger DLRO10HD is capable of delivering 10 A while measuring up to 250 mΩ and 1 A while measuring up to 2.5 Ω.

The Differences of the Megger DLRO200-115 and Megger MOM2 DLRO

May 14, 2012
DLRO, Megger, Ohmmeter

One of the best methods of testing the current carrying efficiency of conductor junctions is by measuring the junction resistance. Circuit breaker or relay contacts, bus bars and switchgears constantly carry high currents. If the junctions deteriorate, the current carrying efficiency may be reduced and cause several problems like welding of contacts, localized Ohmic heating and eventual component failure.

Accurate Low Resistance Measurement with the AEMC 5600

June 26, 2011
DLRO, Low Resistance Ohmmeter, Micro-Ohmmeter, Ohmmeter

You can save a lot of money by prolonging the operating life of your electrical components. This not only saves you from the hassles of electrical problems caused by faulty equipment, it also saves you from expenses on replacements. You can do this by regularly testing your electrical system so you can recondition it even before it totally fails.

A Smart Way to Keep Electrical Maintenance Costs at the Minimum

April 29, 2011
Hipot, Ohmmeter, Rent Electrical Test Equipment

Renting is a smart way to reduce costs on electrical maintenance and clutter in your equipment storage area, because you do not have equipment to keep and maintain. Many think that renting is not reliable in emergency situations because it takes time before you receive equipment. However, there are companies that offer same day delivery so you can immediately do repairs within the day.

Megger Test a DC Motor

October 8, 2010
Megger, Ohmmeter

To Megger test a DC motor, you might need more than a simple ohmmeter because the problem you are investigating may not become clear until the motor is in operation. A viable solution is to Megger test with high-voltage test equipment using 1,000 – 10,000. With this test equipment, you can identify insulation leakage in motor coils and related wiring.

The Megger test procedure is relatively simple. First, to protect yourself, be sure the motor rests on an insulated pad. Then disconnect power from the motor and the electrical terminations from the power source feeding the motor. Connect one of the motor leads to the Megger probe and the other lead from the Megger test equipment to the motor’s metal frame. Turn on the Megger test unit. It will take a couple of seconds for the Megger test unit to display the voltage. (A lower ohm reading indicates deterioration in the wiring insulation.) Now turn off the test equipment, rotate the end shaft about 30 degrees and repeat the test.