Major tech MT942 Manuale utente

MT942

LED Light Meter

User Manual

LED Light Meter

User Manual

Light Source

AVG

NO.

AVG

MEM

Contents

1. Description ..........................................................................................

2. Safety Precaution .................................................................................

3.Preface ................................................................................................

4. Features ..............................................................................................

5. Specifications ......................................................................................

6. Operation .............................................................................................

7. Luminous Intensity Measurement .........................................................

8. Instrument Description .........................................................................

9. Attention ..............................................................................................

10. Recommended Levels of Illumination .................................................

11. Battery Replacement ..........................................................................

12. End Of Life ........................................................................................

Page

LED Light Meter User Manual

1. Description

2. Safety Precaution

3.Preface

Measures light from visible luminaries equipped with white light LED, fluorescent,

metal halide, high-pressure sodium and incandescent sources.

• Do not operate the meter under the environment with explosive gas (material),

combustible gas (material) steam or filled with dust.

• In order to avoid reading incorrect data , please replace the battery immediately

when the symbol “ ”appears on the LCD.

• In order to avoid the damage caused by contamination or static electricity, do

not touch the circuit board before you take any adequate action .

• Operating Environment: Indoors use, This instrument has been designed for

being used in an environment of pollution degree 2.

• Operation Altitude : Up to 2000 M.

• Operating Temperature & Humidity : 5 C~40 C,0%~70%RH.

• Storage Temperature & Humidity :-10 60

•

The flux of light received in a unit area of a certain side being shown is popularly

known as illumination . The measuring unit in both United Kingdom and America

is known as footcandles light ,but in Europe it is also known as meter candlelight.

One foot-candles light is the illumination of light that falls on one side which is

one foot away from a one foot-candlelight and exactly intersecting with the light .

Its abbreviated form is written as 1 Fc= l Lm/ft, similarly, one-meter candlelight

is the illumination of light that falls on a side which is one meter away from a one

meter candlelight and exactly intersecting the light. It is also called Lux i, e. the

flux of light being received in each sq. meter is called the illumination of one lumen.

1FC=10.764 LUX, 1LUX= 0.09290 FC,

˚˚

˚˚C~ C,0%~70%RH.

EMC:EN61326-1(2006) . IEC61000-4-2(2006).

IEC61000-4-3(2006)+(2007).

•

Be extremely careful for the following

conditions while measuring.

CAUTION

LED Light Meter User Manual

therefore, Nbr. of foot (meter) candlelight =

Nbr .of Lumen

Area(sq .foot or sq .meter)

Nbr .of Lumen= Nbr. of foot (or meter) × area

• Overload Indication: LCD screen will show “OL” on the upper left-hand corner.

• Low battery indication “ ”.

• Sampling Rate : 2.5 times per second for digital display.

• Spectral response close to CIE luminous spectral efficiency.

• Cosine Angular corrected.

• According to JIS C1609 : 1993 and CNS 5519 general A class Specifications.

• Measuring lights source : LED white light and all visible light

• Measuring intensities of illumination in Lux or footcandles .

• Many application include : Warehouses , factories, office buildings, restaurants,

schools, library, hospitals, photographic, many video, parking garages, museums,

art galleries, stadiums, building security.

• Data hold.

• Maximum/ Average/ Minimum Hold.

• Zero adjustment.

• Auto power off and disable function.

• Auto ranging.

4. Features

•

LED Light Meter User Manual

5. Specifications

6. Operation

1. Press the “ ” button to turn power on or off.

2. Remove sensor cap and place the sensor perpendicular to the light.

3. Select LUX or FC.

4. If you want to keep the reading value on the LCD screen permanently after testing,

Press the “ ” button.

5. When done testing, replace the sensor cover to protect the filter and sensor.

•

Freezes the reading present on the LCD screen at the moment the button is pressed

•

Press the“ ” button for the zero adjustment if any digits appear on the LCD

screen, when the light sensor cap is not attached “CAP” will be shown on the

Data Hold

ZERO

Display

Sensor

Measuring Range

Accuracy

Angle deviation from cosine

characteristics

Power Supply

Dimensions

Weight

Accessories

Length of wring for light sensor : Approx. 1.5M

4000 count, maximum display 3999

Silicon photodiode with filter

40, 400, 4000,40000, 400000 Lux

40, 400, 4000, 40000 Footcandles

±3% (Calibrated to standard Incandescent

lamp 2856°K and Corrected LED day while

light Spectrum)

6% other visible light source

30 °

60 °

80 °

1.5V AAA*3 alkaline battery

162(L)*63(W)*28(H)

about 250g

user manual

±2%

±6%

±25%

LS..

ZERO

LED Light Meter User Manual

screen. make sure that it is Attached to the light sensor.

•

Press “ ” button simultaneously Lockup data maximum and average and

minimum value of measure data. Press the “ ” button for more than 1 seconds

to disable this feature .

•

Illuminance LUX or Foot candle and luminous intensity measuring unit button.

•

Light source selection1~9features, each light source can set correction

parameters , default as 1.000.calibration parameters can be set to 0.001 to 1.999 ,

when the pressure L. S. button for more than 1 second , the digits of 1.000 on

the lower right-hand corner of the screen will be flashing , pressure or ,

you can change the calibration parameters as to 1.002 , the display changes

immediately , set 200.0×1.008= 201.6 , press L .S button for less than 1 second ,

LCD Light source below the LN flashing , pressure or change L1 to L9 .

Setup complete press “ ” for more than 1 second .

L1 LED white day light : 0.99 .

L2~L9 Default standard light source A : 1.00 .

Power off automatically after approx.3 to 5 minutes without using the meter.

When the power is on, press the button for more than 1 second , to cancel

or recovery automatically shutdown . Automatic shutdown feature is enabled if

“ ”shows on the screen.

Press button for one second to store the data, the LCD screen will display M

and NO . 01~ NO . 99.

MAX/AVG/MIN

LX/FC/CD

Light Source

• Light Source factor :

• Auto-Power Off

• Disable Auto Power Off

• MEM ( memory )

•

LS..

LED Light Meter User Manual

• READ ( read memory )

• CLEAR( clear memory )

•

7. Luminous Intensity Measurement

Press button for more than one second to display the store values , the

LCD will display R and MEM and NO . 01~ NO . 99, press or Keys to

review all the stored values , for example , NO.1 NO.2 until NO.99 . Press

the button for more one second to disable this feature.

When power is off, press and buttons together,then the screen will

display “Clr ” which means the memorized data is erased .

1. Press the “ ” button to turn power on or off .

2. Remove sensor cap and place the sensor perpendicular to the light .

3. Press “ ” button for more than one second .

4. Press or button to select ft(feet) or (meter).

5. Press “ ” button for less than one second.

6. Press or button to set the distance between the light center of lamp

and measurement base level.

7. Press “ ” button for less than one second.

8. Read the display.

9. Press “ ” button for more than one second to disable the feature .

The luminous intensity is calculated using the following formula:

Luminous intensity (cd) =illumination (LUX) × distance (m²)

The preset maximum distance is 0.01 ~ 30.47 m or 0.01 ~99.99 ft.

If a single light source is used and is regarded as a single-point light source ,

the luminous intensity of the light source can be calculated and displayed, by

setting the distance from the light source to the measuring point.

•

MEM

READ

MEM

READ

MEM

READ

Lux/FC

LED Light Meter User Manual

8. Instrument Description

1-Display ( LCD).

2-LUX/FC/CD button.

3-MEM/READ.

4-MAX/AVG/MIN and setup upward.

5-Real time auto zero.

6-Power ON/OFF and disable auto power off.

7-Setup downward.

8-DATA HOLD and light source select ( L.S. ).

9-Photo detector.

MEM

READ LS..

Lux/FC

LED Light Meter

ZERO

Light Source

AVG

NO. AVG

MEM

LED Light Meter User Manual

•

9. Attention

Relative Spectral (Sensitivity)

The deviation from the comparative standards for luminosity is determined by

JIS standard C 1609-1993.

Peak sensitivity wavelength : 550 nm

Corrected LED day white light Spectrum

Set for referring the testing of source of light is located at the right top end (0

degree) of the light sensor ball plane.

When the meter is not in use . please keep the cap of the light sensor in its place

to avoid the photo diode from wearing out.

•

350 400 450 500 550 600 650 700 75044444444

1.2

WAVELENGTH (mm)λGG

WAVELENGTH (nm)G

300 400 500 600 700 800 900444 44 444 444 444 444

100

(Typ.Ta=25°C)

Light Source 0 degree

LED Light Meter User Manual

•

Offices

Factories

Schools

10. Recommended Levels of Illumination

When it is not in use for a long time, please take the batteries

Away. And avoid keeping it in a place of high temperature and humidity.

Suitable levels of illuminace

( According to the JIS standard Z 9110-1979)

•

Illuminance (lux)

1500 to 750

750 to 300

300 to 100

75 to 30

Place

Offices, designing, drawing rooms

Offices, conference rooms, computer rooms

Workrooms, corridors, stairways, restrooms

Indoor emergency stairways

Illuminance ( lux )

3000 to 1500

1500 to 750

750 to 300

300 to 150

75 to 30

Place

Where such work as assembling, inspecting testing,

selecting, extremely precision Visual work

Assembling, inspecting, testing,selecting, precision

visual work

Assembling, inspecting, testing, selecting and visual

ordinary work

Wrapping and packing

Indoor emergency stairways

Illuminance (lux)

1500 to 300

750 to 200

300 to 75

75 to 30

10 to 2

Place

Precision drawing or drafting, precision experimenting ,

library

Classrooms ,library reading rooms,Staff room ,

gymnasia

Lecture halls, assembly room corridors, locker rooms,

stairways, restrooms

Warehouses and emergency stairways

School passages

LED Light Meter User Manual

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