Electrical instruments are instruments that use the mechanical movement of electromagnetic meter to measure voltage, power, current… Electrical technicians require electrical measurement equipment to check the electrical activity and to detect the presence of voltage or current. By using this instrument we can measure electrical parameters such as voltage, frequency, current, power factor, and resistance. Electrical measurements are depended upon either current or voltage while measuring the frequency we will be measuring the frequency of a current signal or a voltage signal.

1. Assistant Electrician
(NSQF Level – 3)
Type of electrical measuring tools
and devices such as voltage tester,
earth tester, muti meter, digital
ammeter etc. and their respective
use to trace out malfunctions in
electrical circuits/ connections like
power interruption/ continuity,
power leakage, earth leakage
Assistant Electrician (NSQF Level – 3)
SECTOR: CONSTRUCTION
SUB-SECTOR: REAL ESTATE AND
INFRASTRUCTURE
OCCUPATION: CONSTRUCTION AND
ELECTRICAL WORKS
REF. ID: CON/Q0602
NSQF LEVEL: 3
Sl no:2

2. Electrical Measuring Instrument
Electrical instruments are instruments that use the
mechanical movement of electromagnetic meter to measure
voltage, power, current… Electrical technicians require
electrical measurement equipment to check the electrical
activity and to detect the presence of voltage or current. By
using this instrument we can measure electrical parameters
such as voltage, frequency, current, power factor, and
resistance. Electrical measurements are depended upon
either current or voltage while measuring the frequency we
will be measuring the frequency of a current signal or a
voltage signal.

3. Type of Electrical Measuring
Instruments
Now we are use two type measuring
instruments
A: Analog Type
B: Digital Type

4. Ammeter
An ammeter (from Amp
ere Meter) is
a measuring instrument
used to measure
the current in a circuit.
Electric currents are
measured
in amperes (A)

5. Voltmeter
A voltmeter is an
instrument used for
measuring electrical
potential difference
between two points in
an electric circuit.

6. Clamp Meter
A clamp meter is an
electrical test tool that
combines a basic digital
multi meter with a
current sensor.

7. A multi meter or a multi
tester, also known as
a VOM (volt-ohm-milli
ammeter), is
an electronic measuring
instrument that
combines several
measurement functions
in one unit.
Multi Meter

8. Megger
The Megger is
the instrument uses
for measuring the resista
nce of the insulation.

9. Continuity Tester
A continuity tester is an
item of electrical test
equipment used to
determine if an electrical
path can be established
between two points.

10. Tachometer
A tachometer (revolutio
n-counter, rev-counter,
RPM gauge) is an
instrument measuring
the rotation speed of a
shaft or disk, as in a
motor or other machine.

11. Watt Hour Meter
Watt-hour meter is in
fact a measuring device
which can evaluate and
records the electrical
power passing through a
circuit in a certain time.

12. Watt Meter
The wattmeter is an
instrument for
measuring the electric
power in watts of any
given circuit.

13. Frequency Meter
A frequency meter is an
instrument that displays
the frequency of a
periodic electrical
signal.

14. Power Factor Meter
The power factor
meter measures
the power factor of a
transmission system.
The power factor is the
cosine of the angle
between the voltage and
current.