Electrical Measuring Instruments – Testing Equipment Electrical – Types of Electrical Meters
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The testing equipment used to detect faults
in the operation of electrical devices by creating stimulus signals and capture responses
from electrical devices under test is known as electrical test equipment. If any faults are detected, then identified
faults can be traced a rectified using electrical testing equipment. Most often all electrical and electronic circuits
are tested and troubleshooted to detect faults or abnormal functioning if any. Therefore, testing equipment is necessary
to find and analyze the circuit conditions, for checking electronic test equipment and
maintenance in various industries. The nine common types of electrical testing
equipment’s discussed in this video. There are Voltmeter, Ammeter, Ohmmeter, Multimeter,
Clamp meter, Wattmeter, Energy meter, Megger meter, Oscilloscope etc. Voltmeter:
A basic electronics device or instrument used to measure voltage or electrical potential
difference between two points in electrical circuits is known as voltmeter. There are two types of voltmeters: analog
and digital. An analog voltmeter moves a pointer across
a scale in proportional to the voltage of the electrical circuit. A digital voltmeter measures an unknown input
voltage by converting the voltage to a digital value by using a converter and then displays
the voltage in numeric form. Ammeter:
A measuring instrument which is used to measure the electric current in a circuit is known
as an ammeter. The units of measurement for electric current
is amp. There are different types of ammeters such
as moving-coil, moving magnet and moving-iron, etc. Ohmmeter:
An electrical instrument that measures electrical resistance is known as an ohmmeter. The instrument used to measure small value
of resistance are micro-ohmmeters. Similarly, meg-ohmmeters is used to make large
resistance measurements. Resistance values are measured in ohms. Multimeter:
A multimeter is an electronic instrument used to measure the three basic electrical characteristics:
voltage, current and resistance. It has multiple functions and acts like ohmmeter,
voltmeter and ammeter and also used for household wiring, electric motors, testing batteries
and power supplies. The multimeter is a handheld device with a
needle over a numeric LCD digital display for indication purpose. It is also used to test continuity between
two points in an electrical circuit. Clamp meter:
a current clamp meter 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. Current clamps are typically used to read
the magnitude of alternating current and, with additional instrumentation, the phase
and waveform can also be measured. Wattmeter:
The wattmeter is an instrument for measuring the electric power 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. Energy meter: An energy meter is a device that measures
the amount of electric energy consumed by a residence, a business, or an electrically
powered device. Electric utilities use electric meters installed
at customers’ premises for billing purposes. They are typically calibrated in billing units,
the most common one being the kilowatt hour (kWh). They are usually read once each billing period. Megger meter:
Mega ohmmeter or megger is a special type of ohmmeter used to measure the electrical
resistance of insulators. Insulating components, for example cable jackets,
must be tested for their insulation strength at the time of commissioning and as part of
maintenance of high voltage electrical equipment and installations. Oscilloscope:
The oscilloscope is an electronic test instrument that constantly obverses varying voltage signals
as a two dimensional plot of one or more signals as a function of time. The other names for oscilloscope are oscillograph,
cathode ray oscilloscope or digital storage oscilloscope. It is also used for converting non electrical
signals such as vibration or sound into voltages and then displays the result. Dear viewers, Thanks for watching the video. If you have any question write in the comment
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