MAJOR TECH MT942 Digital LED Light Meter Instruction Manual

: October 29, 2023
: MAJOR TECH

MAJOR TECH MT942 Digital LED Light Meter

MAJOR-TECH-MT942-Digital-LED-Light-Meter-product

Product Information

Product Description

The MT942 LED Light Meter is a device that measures light intensity from visible luminaries equipped with white light LED, fluorescent, metal halide, high-pressure sodium, and incandescent sources. It can measure light in units of Lux or Footcandles and has an accuracy of 6% for other visible light sources.

Features

Data Hold
Zero
MAX/AVG/MIN
LX/FC/CD
Light Source
Light Source Factor
Auto-Power Off
Disable Auto-Power Off
MEM (memory)
READ (read memory)
CLEAR (clear memory)

Product Specifications

Function	Range	Display
Lux Measurement	40, 400, 4000, 40000, 400000 Lux	4000 count, maximum display

Usage Instructions

Press the power button to turn the LED Light Meter on or off.
Remove the sensor cap and place the sensor perpendicular to the light source that you want to measure.
Select Lux or Footcandles and take the measurement.
If you want to keep the reading value on the LCD screen permanently, use the Data Hold feature.

DESCRIPTION

Measures light from visible luminaries equipped with white light LED, fluorescent, metal halide, high-pressure sodium and incandescent sources.

SAFETY PRECAUTION

CAUTION: Be extremely careful for the following Conditions while measuring.

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°C – 60°C, 0% – 70%RH.
EMC: EN61326-1 (2006) . IEC61000-4-2 (2006). IEC61000-4-3 (2006) + (2007).

PREFACE

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 foot-candles 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-footcandle light and exactly intersects with the light.

Its abbreviated form is written as 1 Fc= I 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. 1 FC=10.764 LUX, 1 LUX= 0.09290 FC.

therefore, Nbr. of foot (meter) candlelight =
- Nbr .of Lumen
Area (sq .foot or sq .meter)

FEATURES

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: LEO 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, video, parking garages, museums, art galleries, stadiums, building security
Data hold
Maximum/ Average/ Minimum Hold
Zero adjustment
Auto power off and disable the function
Auto ranging

SPECIFICATIONS

Function Range

Display| 4000 count, maximum display 3999
Sensor| Silicon photodiode with filter
Measuring Range| 40, 400, 4000,40000, 400000 Lux

40, 400, 4000, 40000 Footcandles

Accuracy| ±3% (Calibrated to standard Incandescent

lamp 2856°K and Corrected LED day while light Spectrum). 6% another visible light source

OPERATION

Press the ” ” button to turn power on or off.
Remove sensor cap and place the sensor perpendicular to the light.
Select LUX or FC.
If you want to keep the reading value on the LCD screen permanently after testing, Press the “ ” button.
When done testing, replace the sensor cover to protect the filter and sensor.

Data Hold

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

ZERO

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

MAX/AVG/MIN

Press the” ” 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.

LX/FC/CD

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

Light Source

Light source selection 1 – 9 features, each light source can set correction parameters, default as 1.000. calibration parameters can be set to 0.001 to 1.999, when the L. S. button is pressed for more than 1 second, the digits of 1.000 on the lower right-hand corner of the screen will be flashing, press 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, press or to change L 1 to L9 . Setup complete press ” ” for more than 1 second .

Light Source factor

L 1 LED white day light: 0.99.
L2~L9 Default standard light source A: 1.00.

Auto-Power Off

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

Disable Auto Power Off

When the power is on, press the button for more than 1 second, to cancel automatic shutdown. Automatic shutdown feature is enabled if ” ” shows on the screen.

MEM (memory)

Press button for one second to store the data, the LCD screen will display M and NO. 01~NO. 99.

READ (read memory)

Press the 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, N0.1 N0.2 until N0.99. Press the button for more one second to disable this feature.

CLEAR (clear memory)

When power is off, press and buttons together, then the screen will display “Clr ” which means the memorized data is erased.

LUMINOUS INTENSITY MEASUREMENT

Press the ” ” button to turn power on or off .
Remove sensor cap and place the sensor perpendicular to the light .
Press the” ” button for more than one second .
Press or button to select ft(feet) or (meter).
Press the” ” button for less than one second.
Press or button to set the distance between the light center of lamp and measurement base level.
Press the” ” button for less than one second.
Read the display.
Press the” ” button for more than one second to disable the feature.
- The luminous intensity is calculated using the following formula: Luminous intensity (cd) =illumination (LUX) x 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.

INSTRUMENT DESCRIPTION

MAJOR-TECH-MT942-Digital-LED-Light-Meter-fig-10

Display (LCD)
LUX/FC/CD button
MEM/READ
MAX/AVG/MIN and setup upward
Real time auto zero
Power ON/OFF and disable auto power off
Setup downward
DATA HOLD and light source select (LS.)
Photo detector

Relative Spectral (Sensitivity)

The deviation from the comparative standards for luminosity is determined by JIS standard C 1609-1993.
Peak sensitivity wavelength : 550nm
Corrected LED day white light Spectrum

ATTENTION

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.
When it is not in use for a long time, please remove the batteries and avoid keeping it in a place of high temperature and humidity.

RECOMMENDED LEVELS OF ILLUMINATION

Suitable levels of illuminance (According to the JIS standard Z 9110-1979)

Offices

Illuminance (LUX)	Place
1500 to 750	Offices, designing, drawing rooms
750 to 300	Offices, conference rooms, computer rooms
300 to 100	Workrooms, corridors, stairways, restrooms
75 to 30	Indoor emergency stairways

Factories

Illuminance (LUX)	Place
3000 to 1500	Where such work as assembling, inspecting testing, selecting,

extremely precision Visual work
1500 to 750| Assembling, inspecting, testing, selecting, precision

visual work

750 to 300| Assembling, inspecting, testing, selecting and visual ordinary work
300 to 150| Wrapping and packing
75 to 30| Indoor emergency stairways

Schools

Illuminance (LUX)	Place
1500 to 300	Precision drawing or drafting, precision experimenting, library
750 to 200	Classrooms, library reading rooms, staff rooms,

gymnasium

300 to 75| Lecture halls, assembly room corridors, locker rooms, stairways, restrooms
75 to 30| Warehouses and emergency stairways
10 to 2| School passages

BATTERY REPLACEMENT

WARNING

If the symbol ” ” appears on the LCD, please replace the battery immediately.

Remove the battery cover
Replace the battery
Replace the battery cover

END OF LIFE

Caution: this symbol indicates that equipment and its accessories shall be subject to a separate collection and correct disposal.

RECOMMENDED ILLUMINATION

Locations	Lux	FC
Office	Conference, Reception Room	200~750
Clerical Work	700~1,500	65~140
Typing Drafting	1,000~2,000	93~186
Factory	Visual Work At Production Line	300~750
Inspection Work	750~1,500	70~140
Electronic Parts Assembly Line	1,500~3,000	140~279
Packing Work, Entrance Passage	150~300	14~28
Hotel	Public Room, Cloakroom	100~200
Reception	200~500	18~47
Cashier	750~1,000	70~93
Store	Indoors Stairs Corridor	150~200
Show Window, Packing Table	750~1,500	70~140
Forefront of Show Window	1,500~3,000	140~279
Hospital	Sickroom, Warehouse	100~200
Medical Examination Room	300~750	28~70
Operating Room, Emergency Treatment	750~1,500	70~140
School	Auditorium, Indoor Gymnasium	100~300
Class Room	200~750	18~70