Megohmmeter Repair

Megohmmeters, which are electric meters, provide a fast and simple means of assessing the condition of insulation on wires, generators, and motor windings by measuring very high resistance values. They achieve this by sending a high voltage signal into the object being tested. Although measuring very high electric resistance (above 10s ohms) is the primary function of a megohmmeter, they can also be used to measure surface and volume resistance of insulating materials. AC generators with an operating voltage of up to 500 V, a two-frame magnetoelectric quotient meter, a scale graduated in megohms, and series resistances are the most common types of megohmmeters used. The logometer frames form two parallel branches, one of which contains the resistance rx being measured. The ambient air’s temperature and humidity must be taken into account when measuring insulation electric resistance with a megohmmeter since these conditions can significantly affect the measurements’ accuracy. The instrument scale is nonlinear, and the measurement error is typically between 1-5%. Electronic and digital megohmmeters are also available. If you are in need of repair, please start by filling out our Service Request Form and a certified engineer will respond as soon as possible.


Oil Test Set Repair

To ensure that transformer oil, which is used for insulation and cooling in transformers and other electrical equipment, is still suitable for its purpose, it needs to be periodically tested. This is due to the fact that it tends to deteriorate over time. Various international standards, many of which are established by ASTM, define the testing sequences and procedures. Transformer oil testing is typically done by measuring breakdown voltage and other physical and chemical properties of samples of the oil, either in a laboratory or using portable test equipment on-site. For measuring the breakdown voltage of insulating oils used in electrical equipment, oil dielectric AC test sets provide replicable and accurate measurement. These lightweight and rugged units are designed for use in the field and laboratory.

Dielectric Test Set Repair

A dielectric withstand test, also known as a pressure test, high potential test, or hipot test, is an electrical safety test that is commonly performed on a component or product in the field of electrical engineering to determine the effectiveness of its insulation. The test may be conducted between mutually insulated sections of a component or between energized parts and ground. It is performed to assess a device’s ability to operate safely under rated electrical conditions. If the current through the device under test is below a specified limit at the required test potential and time duration, the device meets the dielectric withstand requirement. A dielectric withstand test can be conducted as a factory test on new equipment or as a routine maintenance test on equipment already in service. During dielectric tests, a high level of alternating current (AC) or direct current (DC) is applied to the insulation barrier, and the material’s response is measured. AC voltage is the preferred method for dielectric testing.

The purpose of a dielectric strength test is to identify the point of breakdown or failure of the material. This occurs when the material undergoes a sudden change in its resistance to the test voltage. The voltage level at which the barrier allows current to flow is known as the dielectric strength of the material. Please inquire repair and calibration services through our Service Request Form and we will reply as soon as possible.