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Choose high potentiometer or megometer?

time:2020/6/11   source:华天电力  reading:328 time

When should you use a high potentiometer and when should you use a megometer? There is no simple answer to this deceptively simple question. Because the difference is not in the function of each instrument, but in the expected results.


First, let's examine what each device does:


Megometer (short circuit means high potential or high voltage) is a term used to verify the electrical safety of finished electrical appliances, cables or other wired components, motors and transformers.


A megohm meter is a special type of ohmmeter used to measure insulator resistance.


Essentially, the high potentiometer and the megometer do the same thing, but they get very different results. Both instruments apply a relatively high voltage to the insulation layer and absorb leakage current through it, depending on the insulation characteristics and conditions, but megohm meters provide the operator with measurement results, while high potentiometers do the job.


When to use megohm meters


Megometers measure very small currents, typically in nanoscale amperes, allowing it to pass through imperfections and the deterioration of insulating materials, which, according to Ohm's law, it converts into resistance readings, which are usually measured in megometers. Anything less than a M Ω is usually considered a stop using the.


Once the operator with a megger readings, he/she must determine whether the device under test should continue to use, cleaning, repair or scrap, because only in a few milliamps by megger test electric work flow, so power is limited and will not damage the insulation layer, it is very important, because the most effective use of megger involves repetitive routine test, in order to determine the trend of life cycle and preventive maintenance.


Insulation Resistance Tester.png


When to use a high potential tester


In contrast, high potentiometers use high voltages and currents, and while they can provide measurements, their main function is to identify and eliminate weak potentials. For example, before a costly failure occurs in the operation, the edge equipment can be stopped by destroying the weak insulation. Tests may be performed at either DC or AC voltage.


A high potentiometer is also known as a "dielectric voltmeter." The tested object shall be able to withstand the applied voltage. However, tradeoffs can be made in the "refilling" test. It has a voltmeter and an ammeter, and the two are expected to rise in sync as long as the insulation is "withstand". When the current begins to rise faster than the voltage, the test stops abruptly and more damage occurs. The tested item needs to be repaired.


Select the correct test equipment


The choice of testing between a high potentiometer or megometer really comes down to what to test, the voltages and currents to test, and some personal preferences.


If you're looking for a measurement to track device lifecycle trends. The Megabyte is your tool.


However, if you want to actually put pressure on the device under test to see if it still meets the standards and operates safely, having a withstand test will help you take more decisive action.


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