0
The same way as an OHM meter. You are measuring resistance in OHMs. However, this meter measures a higher scale of ohmage. It is used for checking insulation which should always have high ohmage (high resistance). The upper scale of high ohmage is marked on the meter as "infinity" or the Greek sysmbol for it.
Wiki User
∙ 16y ago
Wiki User
∙ 12y agoOn the whole megger testing is non destructive. What happens is a DC voltage is applied to the device or winding under test. It is an insulation test to see is the insulation has been injured in any way to cause a short circuit when normal power is applied to it. On my megger there are 3 ranges 300V, 750V, and 1000 volts. Applying the proper voltage is essential to not damaging the device you are testing. Working voltages up to 240 volts should use the 300 range. Working voltages up to 600 volts use the 750 volt range and working voltages above 600 use the 1000 volt range. As you can see if you used the 1000 volt range on a device that had a working voltage of say 24 volts you could damage the insulation just by testing it. So meggering a device is non destructive if you use the tester as its instructions tell you to.
<><><>
For the sort of standard text-book stuff being asked in this question it's much better to use the excellent Answers.com and other well-known "reference" or "encyclopedia" sites. You will also see very useful photos and diagrams to help to explain the answer.
The actual answers on WikiAnswers must currently be text-only and, for other information such as pictures, photographs, etc., separate links must be added below the answer.
For instance, the Related Link to Answers.com's site - shown below the Related Questions for this answer - shows a circuit diagram, as well as a good description, of a "megger" instrument.
WikiAnswers is not ideal for use as a "reference site" or an "encyclopedia site" because you have to wait until someone either writes a special answer to your new question or merges it into an existing question asking about the same thing.
WikiAnswers is part of the Answers.comTM network.
Add your answer:
Earn +20 pts
How do you measure continuity of protective conductors for ring final circuit?
A megohm meter is an insulation test instrument. If the project requires an insulation test to be done then this is what you should use. A "megger" will apply a DC voltage up to 1000 volts on the conductor to see if there is a breakdown in the insulation value.
What scale of resistance does a megohm meter measure?
Mega = million Megaohm = 1000000 Ohms
What do megger measure?
Megger is usually short for Mega Ohm Meter. It measures high values of resistance with good accuracy. Most often used to test insulation.
Construction of ohm meter and megger?
Ohm meter is basically a series combination of resistances and galvanometer and source of current .Used to determine unknown resistance.
Which instrument is used to test insulation breakdown of a conductor?
Because contemporary testing is more complex and includes provisions for assessing a broader spectrum of characteristics (and doing it more accurately), we have specialized test equipment to handle it. In the case of insulation breakdown, it can be tested with an insulation breakdown test set. In the "old days" of testing, a megohm-meter or megger was used to "slam dunk" an evaluation.
How do you use a meggar?
A megger is used to test the resistance of high voltage cables, insulation and motor windings. The test employs a megohm meter.
How does a megohm meter work?
The megohm meter (or megger) passes the 500, 750, 1000 volts to the wire that needs to be checked. According to ohms law R=V/I, the current in the returned voltage is measured and divided by the resistance (inside the meter). So when the current is high (i.e not properly insulated or leaking), the resistance value will drop otherwise resistance will be high.
What is the principle used in a megger?
A "Megger" (which is short for "Megohm meter") is an instrument which generates a very high DC voltage so as to be able to test the quality of insulation which should have a very high resistance that can only be measured in megohms.
How do you test motor for burn?
To test a motor, use a megger (megohm meter) to test the insulation of the internal motor windings. Select a voltage to apply to the motor using an output from the megger that is higher that the operating voltage that the motor operates on.
How do you check 110volt motor for short?
To check any piece of electrical equipment for a short circuit a megohm meter will be used. The common name for this piece of equipment is a megger.
What tool is used to conduct insulation test of electric cable?
Strictly-speaking, this instrument is called a 'megohm meter', but is widely-known as a 'megger' which is the trade name of the company that manufactures the instrument.
Can a megger tester cause injury to humans?
A megger device produces hundreds of volts in order to provide resistance values in the order of hundreds to thousands of megohm. The DC volts produced by a megger can and will harm humans.
How do you measure continuity of protective conductors for ring final circuit?
A megohm meter is an insulation test instrument. If the project requires an insulation test to be done then this is what you should use. A "megger" will apply a DC voltage up to 1000 volts on the conductor to see if there is a breakdown in the insulation value.
What do electricians use to test circuits?
Continuity tester, volt meter, clamp on amp meter, megger and ohm meter.
What scale of resistance does a megohm meter measure?
Mega = million Megaohm = 1000000 Ohms
What is a mega ohm meter?
I think you mean megohm-meter or "megger" which is a high voltage, low current electrical insulation tester.
What do megger measure?
Megger is usually short for Mega Ohm Meter. It measures high values of resistance with good accuracy. Most often used to test insulation.
