Using the megohmmeter this is the second lesson in the ammeters, meggers, and wheatstone bridge course. Timed insulation resistance test model 5882 only 1. Using the instrument without its battery compartment cover may result in electric shock to the user. Switches use to select electrical parameters ranges. Some units may also incorporate a hand generator to produce high voltage levels. The megger insulation tester is essentially a highrange resistance meter ohmmeter with a builtin directcurrent generator. Oct 19, 2015 how to meg a motor with a megohmeter checking motor condition. Megohmmeter using the meter checking the battery this function tests the battery under simulated load per en61557. For good insulation, the resistance usually reads in the megohm range. Typically these measurements are made on electrical wires and motor windings to test the insulation value of the wires. The complete guide to electrical insulation testing. Do not perform insulation resistance measurements if ac voltage is present on the device under test. The insulation found on wires, cable, and motor windings serve to protect the wire and keep it separate from other wires. Measurements described in this manual refer to the esd association standards s4.
In the case of an ohmmeter that value is also described in ohms. Well email you at these times to remind you to study. How to test a threephase motor with a megger hunker. Before using your instrument, ensure it is completely dry. This is important, because the highvoltage current in threephase systems is far more lethal than a mere lowvoltage shock received in residential setting. A megger insulation resistance tester is especially useful when you have carried out electrical work on your home and want to make sure you didnt damage insulation or make a wiring mistake. Circuit is designed as a lowpower, high efficiency type, using 6f22 battery, 500v range measuring 1. To disable this feature, press and hold j while turning the power on.
Jul 17, 2017 the megohmmeter, or megger, is a measuring device that tests high electrical resistances. Do not use the instrument if it appears to be damaged, incomplete. Accidental touching of two conducting wires can result in an. The megohmmeter, or megger, is a measuring device that tests high electrical resistances. The use of leads or other accessories of a lower voltage rating or category limits the use. To extend battery life, the megohmmeter will shut itself off after approximately 5 minutes of inactivity. How to meg a motor with a megohmeter checking motor condition. The megohmmeter models 1210n1250n are sources of high voltage, as is the sample connected to them. Understanding insulation resistance testing jm test systems pdfsmegohmmeterinsulationresistancetesting.
The insulation resistance tester resembles a conventional ohmmeter. To measure the effectiveness of high voltage resistance, low current measurement techniques are used. So for your safety, here are some tips on how to use a megohmmeter, whether yours is bat. During a ramp test, the output voltage starts at 0 v and increases linearly 100 vs until it reaches the specified test voltage or until a sudden drop in measured resistance is detected.
Congratulations on your purchase of extechs insulation testermegohmmeter. This professional meter, with proper care, will provide years of reliable service. To turn the meter back on, turn the rotary switch to. The comprehensive product users manual for the amprobe amb4d megohmmeter keywords. Aemc instruments considers the use of rubber gloves to be. Press and release the yellow test button to start the timer and initiate the test voltage. Megohmmeter using the meter to measure insulation resistance, do the following. The megohmmeter will correct any setting that is entered improperly.
How to use a megger to measure and test motor insulation. Megohmmeter definition megger working principle megger working principle megohmmeter circuit diagram the megohmmeter or megger is an instrument for measuring very high resistances, such as the insulation resistance of electrical cables. Bm500 digital insulation tester output 100v 250v 500v three voltage, bn15 00a output of 250 v 500v v three voltage measurement range of 0. The 5 and 15 kv megohmmeters are highvoltage, lineoperated instruments.
But the megger provides a much higher voltage rather than the ohm meters typical threevolt test voltage derived from an internal battery. Timeresistance testing method this method is fairly independent of temperature and often. Failure to do so could result in damage to equipment and electrical shock. Users manual test equipment depot 99 washington street. This lesson describes safety issues to consider when using a megohmmeter, how to select the correct megger for the job, setup, and the steps necessary to take a megger reading. We recommend using our bd loops ez detector checker to help trouble.
Instruction manual megohmmeter danbridge electronics. Megohmmeter teraohmmeter a megohmmeter is an instrument that uses a high value dc voltage to measure the resistance of insulators. Insulation resistance measurements megohmmeter tests warning. Others are designed to accept an input from a high. We want to prevent installers from accidently replacing good loops by making such a small mistake while testing. User guide model 380260 insulation tester megohmmeter. A friend said his father used a megger to hunt for worms in the mud for fishing.
It works by using 2 probes to send a current through the circuit and measuring how much resistance, in ohms, that current encounters. A megger is a highrange ohmmeter, typically used to measure the resistance of wire insulation. The first step in using an ohmmeter is setting it up. Crank the handle for about a minute, and notice the resistance reading. However, some plants, particularly with higher voltage ratings in equipment, use another megger product the dielectric test set. Megger working principle types history uses of megger. Megohmmeter 1210n 1250n english user manual v 500v 1kv x 10 300 0 100 2 0 0 400 500 600 20 15 30 40 50 10 0 2 5 50 2 0 10 5 4 3 1. This is to be done in a manner as described in this operators manual. W warning a repetitive beep and the flashing high voltage symbol y. The megger insulation tester is a small, portable instrument that gives you a direct reading of insulation resistance in ohms or megohms.
The megger technical library provides access to a range of additional content and resources such as technical guides, application notes and more. Megger guide to electrical insulation testing pdf instrumart. A handy test lock feature and a data hold function are also included. Place one megger probe to the any mounting bolt on the breaker box to test for grounding continuity, then touch the other probe to a motor terminal. All persons performing or assisting in the tests must employ all safety precautions to prevent electrical shock to themselves and to others. Shop here for batteryoperated, handcranked and lineoperated insulation testers. How to use a megger to identify a faulty component youtube. This range is suitable for leakageresistance measurements of most types of insulation used in electrical machinery, electronic devices and components, etc. The test leads must be replaced before using the meter. Oct 02, 2015 an insulation tester like a megger can show a component failing that a normal multimeter would not show. Choose from a wide range of specifications to help find the test instruments that can meet your needs. The megohmmeter is in resistance mode and a limit lim0 of say 500gohm is stored in limset 1.
Get highquality megohmmeters at grainger to help measure electrical resistances of insulators such as cable jackets, electrical wires and motor windings. Routinely using a megohmmeter to check insulation in both new installations and as part of a maintenance program is a prudent way to ensure your circuits are safe. Apr 08, 2020 an ohmmeter is an electronic device that measures resistance in an electronic component or circuit. The instruments are equipped with numerous advanced features and are easy to use due to the logical user interface. Also called megger, megohmmeter is an electrical tool used for measuring high insulation resistance in electrical items.
When servicing, use only specified replacement parts. With advanced performance, the insulation tester line is designed to be safe, simple to use and gimmickfree. Bd loops bdmegger instructions were on the installers side. If an instrument is marked cat i iec measurement category i, or it is not marked with a. Understanding insulation resistance testing pdf 0712 technical assistance 800 34391.
The fluke 1587 fc is fluke connectenabled so you can download the free fluke connect measurements app to your smartphone and gain. Voltages of up to 1090 vdc maybe present at measurement terminals of the 1864 megohmmeter and voltages of up to 500 vdc on the measurement terminals of the 1863 megohmmeter. Megohmmeter making measurements selecting a ramp or steadystate test the ramptest function is an automated test that checks insulation for a breakdown. Go ahead and test it yourself, it wont damage the loop. Be sure to follow good safety measures to prevent electrical shock. Intended use the 3m model 701 megohmmeter is designed to measure the resistance of static control work surfaces and flooring.
The meter automatically detects if the circuit is energized, and displays the detected voltage. The value is expressed in megohm 1 megohm 1,000,000 ohms. The model 380260 provides three test ranges plus continuity and acdc voltage measurement. An ohmmeter is an electronic device that measures resistance in an electronic component or circuit. The comprehensive product users manual for the amprobe amb2 megohmmeter keywords. Like any other electrical tool, a meghom is dangerous if not used properly. Megohmmeter working principle megger working principle. Using megger tester for these 3 types of insulation. Test interphase resistance by disconnecting the leads from each terminal. Troubleshooting with insulation resistance test instruments.
The prefix meg describes a numerical value of 1,000,000. Caution, refer to this manual before using this meter. The supco m500 megohmmeter is specific ally designed to detect ohms with a scale that reads up to 1,000 megohms 1,000,000,000 ohms. Fluke 1520 users manual 12 autoshutoff the meter automatically turns off after 15 minutes of non use. An insulation tester like a megger can show a component failing that a normal multimeter would not show. Two nos of wire leads for connecting megger with electrical external system to be tested. To accomplish this with some degree of accuracy, you have to apply at least 500 volts. The megger sends voltage through the cable to calculate the amount of current flowing through the circuit, for an. Do not exceed the rated maximum voltages between terminals or with respect to groundearth. The megger company registered the name megger in may 1903 and today offers a wide variety of ir testers.
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