Major tech MT940 User manual

INSTRUCTION MANUAL
DIGITAL LUX METER
MT940

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Contents Page no
3
1. Introduction............................................................................. 4
2. Features .................................................................................. 4
3. Specifications ......................................................................... 4
4. Panel Description.................................................................... 5
5. Measurement Instructions..................................................... 6
6. Battery Replacement. ............................................................. 6
7. Spectral Sensitivity Characteristic ........................................ 6
8. Maintenance ......................................................................... 7
8. Recommended Illumination ................................................... 7

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1. Introduction
This Lux meter is an accurate and delicate instrument with a durable
structure. It measures light intensity within an environment. For safety and
continuous use, please follow instructions carefully and always keep this
manual within easy reach.
2. Features
2.1 Wide range: from 0.1 Lux to 200,000 Lux, 0.01FC to 20,000FC.
2.2 Accurate test, fast response, and auto zero-adjustment.
2.3 Data hold: hold the current test result and peak value.
2.4 Symbol and unit display is easy to read.
2.5 Low battery indicator and auto power off.
3. Specifications
Accessories: manual, battery, black pouch, gift box.
Function
Display 3½ digits, big LCD, max display 1999.
Range 200 Lux, 2000 Lux, 20,000 Lux, 200,000
Lux. 20 FC, 200 FC, 2000 FC, 20,000 FC.
At 20,000 Lux range, to get a correct
reading, the displayed value needs to
multiply 10.
At 200,000 Lux range, to get a correct
reading, the displayed value needs to
multiply 100.
At 20,000 FC, to get a correct reading,
the displayed value needs to multiply 10.
Remark: 1FC=10.76 Lux
Repeatability ±2%.
Temperature ±0.1%/ ℃.
characteristic
Sampling rate 2 times/s.
Sensor Photo diode and filter.
Operation 0℃~40℃ (32℉~104℉) 0~70%Rh.
environment
Storage -10℃~60℃ (14℉~140℉) 0~80%Rh.
environment
Overload Top digit showing “1”.
display
Battery 9V, 6LR61.
Battery life Continuous use 200 hours (alkaline
battery)
Size: 100 x 60 x 27mm (sensor)
130 x 95 x 30mm (meter)
Weight 300g.
Range Accuracy
<10,000 Lux/1,000
FC: ±3% rdg±
0.5%f.s. >10,000
Lux/1,000 FC: ±5%
rdg ±10.
(Accuracy is tested by
a standard parallel
light tungsten lamp of
2856K temperature.)

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4. PANEL DESCRIPTION
1 - LCD display: shows “LUX”, “FC”, “P-H”, “H”, “ ”,“x10”
(reading multiplying 10), “x100” (reading multiplying 100)
2 - POWER button: Press the “POWER” key to turn the meter
on/off. The meter will enter auto power off mode if there is no
measurement in 20 minutes. Press the POWER button to restart.
3 - Range and Unit button: Press the “LUX” key to display unit at 200
Lux, 2,000 Lux, 20,000 Lux and 200,000 Lux. Press “FC” key to
display unit at 20 FC, 200 FC, 2,000 FC and 20,000FC.
4 - HOLD and PEAK button: Press the “PEAK” key to capture
the pulsing signal >100mS and hold its peak value. Press
the “HOLD” key to hold the meters reading and measurement value.
5 - Light sensor: senses brightness/lux of environment.
6 - Stand (on the back).
7 - Battery case (on the back).

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5. MEASUREMENT INSTRUCTIONS
5.1 Press POWER button to turn on the meter.
5.2 Choose suitable range and displaying unit.
5.3 Open the sensor cover, and horizontally place the sensor under the
light source.
5.4 Read the measurement result on the LCD.
5.5 If “1” displaying on the top digit, it means overload, a higher range
should be selected.
5.6 Press HOLD button, “ H ” symbol appears, and the current value will
be held. Press HOLD again to exist HOLD mode. Press PEAK button,
“ P-H ”symbol appears, the light impulse signal can be measured and
its peak value will be held. Press PEAK button again to exist PEAK
mode.
5.7 If the measurement is completed, cover the light sensor and press
POWER button to turn off the meter.
6. BATTERY REPLACEMENT
6.1 When the LCD shows “ ” symbol, is necessary to replace the
battery.
6.2 Turn off the meter and take off the holster. Loosen the screw on the
battery door and slide the cover away from the instrument.
6.3 Replace the old battery with a new 9V battery and reinstall the cover
and holster.
6.4 If the meter is not used for a period of time, please remove the
battery from the meter.
7. SPECTRAL SENSITIVITY CHARACTERISTIC:

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8. MAINTENANCE
8.1 DO NOT operate or store the meter in a high temperature or
humidity environment.
8.2 Keep the white sphere of the light sensor clean when taking
measurements.
8.3 The top of the spherical sensor is the accuracy reference level.
8.4 The sensitivity of the light sensor will decrease due to the service
conditions as luminous intensity and time. To maintain the basic
accuracy, regular calibration is recommended.
9. RECOMMENDED ILLUMINATION
Drawing classroom, sewing classroom,
computer classroom.
Classroom, laboratory, researching
room, practice place, library,
bookstore, office, resting room,
meeting room, health-care room,
restaurant, kitchen, guard room,
gymnasium, printing room, pantry,
broadcasting room.
Laboratory, library, drafting room.
Corridor, elevator aisle, toilet, duty
room, workers room, bridge, stadium,
overpass.
Storehouse, garage, fire escapes.
Visual function tests room.
Operation room.
Consulting room, treatment room,
pharmaceutical room, dispensing
room, drugstore room, dissecting
room, pharmacological bacterial room,
emergency room, delivery room,
dean’s office, nurse office, meeting
room.
Sickroom, drug room, sickbed.
School
300~1500 Lux
200～750 Lux
150～300 Lux
75～150 Lux
30～75 Lux
300～10000 Lux
750～1500 Lux
300～750 Lux
150～300 Lux
Hospital

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Hospital
Cont.
Home
Firm
Factory
Dressing rooms, material treatment
room, sickroom corridor, stairs,
endoscopy room, bacteria reduction
chamber, ward room.
Animal room, darkroom (photo), fire
escapes.
Handicraft, sewing.
Writing, doing homework.
Reading, make-up, kitchen table,
telephone.
Wash sink, entertainment room, parlor,
entrance mirror.
Wardrobe, toilet, stairs, corridor.
Doorplate, mailbox, doorbell button,
balcony.
Designing room, firm
Hall aisle (day) , drawing room,
operating room, typing room.
Computer room, meeting room, printing
room, control room, entertainment
room, restaurant, switchboard room.
Bookstore, resting room, guard room,
elevator (aisle), toilet, entertainment
room.
Resting room, dressing room,
storehouse, duty room (entrance).
Fire escapes.
Ultra-precision operations, designing,
drawing, precisely check
Designing, analyzing, assembly line,
painting.
Package, measurement, surface
treatment, warehouse office.
Dyeing, cast photos, electrical room.
Entrance and exit, corridor, aisle, stairs,
make-up room, toilet, warehouse.
75～150 Lux
30～75 Lux
1500～2000 Lux
750～1500 Lux
300～750 Lux
150～300 Lux
75～150 Lux
30～75 Lux
300～2000 Lux
750～1500 Lux
300～750 Lux
150～300 Lux
75～150 Lux
30～75 Lux
300～3000 Lux
750～1500 Lux
300～750 Lux
150～300 Lux
75～150 Lux

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Fire escapes, warehouse, outdoor power
equipment (loading and unloading,
inventory movement operation.
Counter.
Entrance, banquet halls, firm, parking
lot, kitchen.
Restaurant, toilet, Japanese-style room.
Entertainment room, corridor, aisle,
bathroom, dressing room, courtyard
accent lighting.
Fire escapes
Indoor display, decorated window
displays, demonstrations places,
checkout counters, packing station.
Lift lobby, escalator.
Negotiations room, make-up room,
toilet, stairs, and corridor.
Resting room, indoor general lighting.
Cut perm, hair dyeing, make-up.
Face decoration, hair washing, lobby
registration desk.
Toilet.
Corridor, stairs.
30～75 Lux
750～1500 Lux
300～750 Lux
150～300 Lux
75～150 Lux
30～75 Lux
300～3000 Lux
300～750 Lux
150～300 Lux
75～150 Lux
750～1500 Lux
300～750 Lux
150～300 Lux
75～150Lux
Factory
Cont.
Inns,
Hotels,
Casinos
Barber
Shops
Shops
Department
Stores