2. A digital voltmeter (DVM) measures an unknown
input voltage by converting the voltage to a digital
value and then displays the voltage in numeric form.
DVMs are usually designed around a special type
of analog-to-digital converter called an integrating
converter.
DVM measurement accuracy is affected by many
factors, including temperature, input impedance, and
DVM power supply voltage variations
VOLT METER
3. A Meter
Mechanical current meters are mostly based
on counting the rotations of a propeller and are
thus rotor current meters. A mid-20th-century
realization is the Ekman current meters which
drops balls into a container to count the
number of rotations.The Roberts radio current
meter is a device mounted on a moored buoy
and transmits its findings via radio to a
servicing vessel.
4. MULTI METER
A multimeter or a multitester, also known as aVOM
(volt-ohm-milliammeter), is an electronic measuring
instrument that combines several measurement
functions in one unit. A typical multimeter can measure
voltage, current, and resistance.Analog multimeters use
a microammeter with a moving pointer to display
readings. Digital multimeters (DMM, DVOM) have a
numeric display, and may also show a graphical bar
representing the measured value.
5. GALVANO METER
A galvanometer is an electromechanical
instrument used for detecting and indicating
electric current.A galvanometer works as an
actuator, by producing a rotary deflection (of a
"pointer"), in response to electric current
flowing through a coil in a constant magnetic
field.
6. CLAMP ON METER
In electrical and electronic engineering, a
current clamp or current probe is an electrical
device with jaws which open to allow clamping
around an electrical conductor.This allows
measurement of the current in a conductor
without the need to make physical contact
with it, or to disconnect it for insertion through
the probe
7. A.C. WATTMETER
The wattmeter is an instrument for measuring
the electric power (or the supply rate of
electrical energy) in watts of any given circuit.
Electromagnetic wattmeters are used for
measurement of utility frequency and audio
frequency power; other types are required for
radio frequency measurements.
8. OHM METER
An ohmmeter is an electrical instrument that
measures electrical resistance, the opposition
to an electric current. Micro-ohmmeters
(microhmmeter or microohmmeter) make low
resistance measurements. Megohmmeters
(also a trademarked device Megger) measure
large values of resistance.The unit of
measurement for resistance is ohms.
9. MEGGER
-Types of megger
1.ElectronicType (Battery Operated)
(1) Megger is a measuring instrument used for
the measurement of insulation resistance of an
electrical system. An electrical system
degrades its quality of insulation resistance
with time and various environmental
conditions including temperature, moisture,
dust particles & humidity.
10. 2.ManualType (Hand Operated)
Insulation resistance IR quality of an electrical
system degrades with time, environment
condition, i.e., temperature, humidity,
moisture and dust particles. It also gets
impacted negatively due to the presence of
electrical and mechanical stress, so it’s become
very necessary to check the IR (Insulation
resistance) of equipment at a constant regular
interval to avoid any measure fatal or electrical
shock.
11. LUX METER
A lux meter is an equipment that measures brightness of
falling on an object at a particular area. In other words, it
properly gauges the intensity at which brightness
appears to the human eye. Don't confuse it with the
measurements of light reflected from an object or light
source and the actual light energy produced by an
object. Lux can be simply defined as a unit of
measurement of illuminance or more accurately,
brightness.
12. TACHO METER
A tachometer (revolution-counter, tach, rev-
counter, RPM gauge) is an instrument
measuring the rotation speed of a shaft or disk,
as in a motor or other machine.[1]The device
usually displays the revolutions per minute
(RPM) on a calibrated analogue dial, but digital
displays are increasingly common.
