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.
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