0
A megameter, or a Megger as it is commonly called, is used
to measure the insulation resistance of cables and other
electrical equipment. The measured value is in mega ohms.
Hence the term Megger.
Most meggers generate 500 Volts DC supply, but their
current capacity remains low.
When the two terminals of a megameter is connected to
across the equipment to be tested, the high voltage gets
leaked into the equipment. The resistance is inversely
proportional to the current flowing through the equipment
under test.
Originally, most meggers were analog in nature, and were
generating high voltage using a dynamo, when the lever is
rotated at high speed.
Today most meggers available are digital, and can
generate 500 volts as well as 1000V. Some meggers have
winding resistance testing facility as well, and hence can
be used as a single tool to test the resistance of a motor
in ohms as well as in Megaohms.
Meggers used for checking high resistance like that of
mains transformrs, generate much higher voltages and are
generally analog type.
Add your answer:
Earn +20 pts
What is swinburne's test of DC shunt motor?
swinburne's test on dc shunt machine is to predetermine the efficiency of the dc machine , but it is not accurate it is just like estimation of efficiency of dc shunt machine when it is run as a motor and a generator............................
Would cause a meter to read negative voltage across a dc motor?
A DC motor generates power when it is rotating even when no supply is connected.
Is swinburnes test direct or indirect test?
in this test their is a no load on dc shunt motor so it is an indirect test
Why is Swinburne's test done on dc machines?
because we cannot apply to series motor
Can a brake test be applied to a dc series motor?
no hands.. :D
What is swinburne's test of DC shunt motor?
swinburne's test on dc shunt machine is to predetermine the efficiency of the dc machine , but it is not accurate it is just like estimation of efficiency of dc shunt machine when it is run as a motor and a generator............................
What would cause a meter to read negative voltage across a DC motor?
A DC motor generates power when it is rotating even when no supply is connected.
Would cause a meter to read negative voltage across a dc motor?
A DC motor generates power when it is rotating even when no supply is connected.
How can a person test a circuit to determine if it is ac or dc?
Use a meter that simultaneously will test for both. Most better meters such as Fluke have this capability Or Switch your meter to AC if you get no voltage over the reading then likely you have a DC circuit. Don't do this by switching to DC first, You very well will ruin your meter if your meter does not have protection to handle this.
What causes a meter to read negative voltage across a DC motor?
The main cause for a meter to read negative voltage across a DC motor is a loose ground wire. The ground wire can be loose or may need to be cleaned.
Is swinburnes test direct or indirect test?
in this test their is a no load on dc shunt motor so it is an indirect test
How can you test the voltage of your car battery?
voltage meter.set to DC voltsBuy a cheap volt meter.
What are advantages of swinburne's test?
we can predetemine the efficiency of a dc machines working as a motor or generator
Why is Swinburne's test done on dc machines?
because we cannot apply to series motor
Can a brake test be applied to a dc series motor?
no hands.. :D
How many voltmeter and ammeter are in dc watt meter?
There is no volt meter or amp meter in a DC watt meter.
Where can you find a diagram for load test of a DC shunt motor?
See the diagram linked below.
