Major tech MT942 User manual

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MT942
LED Light Meter
User Manual
LED Light Meter
User Manual
Light Source
R
AVG
NO.
AVG
MEM
M

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 ........................................................................................
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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).
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•
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Be extremely careful for the following
conditions while measuring.
CAUTION
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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
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•
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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
4.
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
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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 )
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LS..
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LED Light Meter User Manual

• READ ( read memory )
• CLEAR( clear memory )
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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.
6.
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MEM
READ
MEM
READ
MEM
READ
Lux/FC
CD
Lux/FC
CD
Lux/FC
CD
Lux/FC
CD
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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
CD
LED Light Meter
ZERO
1
2
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9
Light Source
AVG
NO. AVG
MEM
R
M
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LED Light Meter User Manual

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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.
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350 400 450 500 550 600 650 700 75044444444
1.2
0
08
6
4
2
0
1.
.
0.
0.
0.
WAVELENGTH (mm)λGG
WAVELENGTH (nm)G
300 400 500 600 700 800 900444 44 444 444 444 444
100
90
80
70
60
50
4
30
20
10
0
0
(Typ.Ta=25°C)
Light Source 0 degree
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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
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LED Light Meter User Manual

11. Battery Replacement
12. End Of Life
1.Remove the battery cover
2.Replace the battery
3.install the battery cover
If the symbol “ ” appears on the LCD,
please replace the battery immediately
WARNING
Caution:
this symbol indicates that equipment and its accessories shall
be subject to a separate collection and correct disposal
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LED Light Meter User Manual

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