Major tech MT940 User manual

INSTRUCTION MANUAL

DIGITAL LUX METER

MT940

Contents Page no

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

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.)

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).

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:

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

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

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

Department

Stores

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