Page 136 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

EXERCISE 58 : To measure the intensity of light by Lux
meter

Objectives

At the end of this exercise you shall be able to:
• check the lux meter, its display and range
• measure the light intensity of different lights by lux meter
• measure the light intensity in different locations of building by lux meter.

Requirements

Tools/Equipments/Instruments Materials/Components
• Combination Plier 165mm, • Test lamp 230 V - 1 No.
insulated - 1 No. • LED bulb 10 W, 30 W, 50 W - 1 No. each
• Neon tester 100mm, 500V - 1 No. • Incandescent bulb 60 W,
• Digital Lux meter 0-200000 lux - 1 No. 100 W, 200 W - 1 No. each
• Measuring tape 15 ft - 1 No. • Pendent lamp holder 6 A - 1 No.

Procedure

Lux meter:

A Lux meter is an instrument which measures the light intensity of natural light as well as artificial light produced by
different Electrical lamps/Bulbs. Lux is the unit of light intensity OR illumination. The Lux meter directly measures
the light intensity in terms of Lux.
The lux meter consists of light sensor, plastic enclosure, range selector switch, battery and digital display. The lux
meter converts light source into Electric current, the amount of current is depends on brightness of light that falls
on light sensor. Lux meter calculate the appropriate value of current and displays in terms of Lux
TASK 1: Identify the lux meter
1 Check the lux meter and its parts.

2 Check the battery of lux meter for working condition.
3 Measure the area of different rooms of house / office.
4 Fix the bulbs / lights of different wattage in the rooms.

TASK 2: Measure the intensity of light by lux meter

1 Switch ON the lux meter and observe the zero reading in the display.
2 Hold the lux meter in one hand and hold light sensor in other hand.
3 Measure the natural light intensity and record the reading.
(Measure the natural light during sun set, mid day, sun set and night)
4 Measure the light intensity in the rooms of house / office and record the readings.
5 Measure the light intensity with different types of lights / bulbs and record the readings.

6 Ensure that no shadows while measuring the light intensity by lux meter.
7 Switch OFF the lux meter, remove the battery and keep it safely.

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