Answer / ajay

megger is used to measure insulation resistance.multimeter is used to measure coil resistance

Answer / raghavendran

The working mechanism of a Meggar and a Multimeter with
regard to measuring a resistance is the same.In this case
Voltage is applied across the body whose resistance is to be
measured.
1)for meggar, there will be two coils namely 'control coil'
and 'deflection coil'.The 'Control Coil' will always be kept
energized by the DC Source.If the insulation strength is low
then there will be current flow through the 'deflection
coil' and the resulting torque in the coil will produce
deviation in the pointer connected to a permanent magnet.The
torque produced by the two coils will be opposite in nature.
2)for multimeter,the control coil will be replaced by a
spring whose tension tends to keep the pointer in one
direction.when current flows through the deflecting coil (ie
when weak insulation)a torque, opposite to the tension of
the spring is produced tending to move the pointer in other
direction.thus showing the corresponding Ohmic Value.

Answer / pillay

meggar is actually a brand name, but it is more often than
not associated with with insulation resistance testers.The
meggar tester /or insulation tester actually uses a high
voltage at its terminals to do the measurements thus being
more efficient in driving In a current and than the
measurements are made.
Multimeter as the name says is used for a variety of
measurements but using basically the same moving coil.when a
high resistance or very small leakage is to be tested using
a multimeter it usually fails because of its in ability to
drive a current through a very high resistance circuit and
give a correct reading.
I would always use a MEGGAR tester for insulation testing
and a multimeter for other testing.

In radial network the source is fed from 1 end both ends at central

0 Answers  

---

In separately excited m/c,we excite the field by a dc source,what not with ac source?

1 Answers  

---

what is technical diffrence between table fan and ceiling fan

5 Answers  

---

what is difference between armoured cable and un armoured cable

2 Answers  

---

why starting current is high and resistance is almost 0 during the starting of motor dc motor...?

0 Answers  

---

What is neutral and how to produced

1 Answers   L&T,

---

CFL lamp is what type of load?

6 Answers  

---

what mean by analog ,digital,numerical meters and relays? say the example?

0 Answers   ABB,

---

How to calculate cable size? How to O&m of vcb?

0 Answers  

---

how to calculate the fault in substation

0 Answers  

---

why neutral wire don't shock?

9 Answers  

---

Which motor has high Starting Torque and Staring current DC motor, Induction motor or Synchronous motor?

5 Answers   BSL, Elite, TTA,

---