1. DIGITAL LIGHT METER Dr. Lim Jac Fang Occupational Health Doctor Department of Health, Sabah 1994 CT Lutron LX-105 LIGHT METER

2. FEATURES  Microprocessor circuit ensure high accuracy an also provide special function and features  Super large LCD display with contrast adjustment for viewing angel.  Dual function display  Heavy duty & compact case  Record Minimum, Maximum & Average readings  Data Hold  Auto power off saves battery life  Operates from 9V battery

3. FEATURES (cont..)  RS 232 PC serial interface  Spectrum of photo sensor meets C.I.E  Wide range measurement both LUX & foot candle units  Relative % light measurement  User selectable lighting type (Tungsten, Fluorescent, Daylight or Mercury)  Zero adjustment by push button

4. GENERAL SPECIFICATIONS Circuit – Custom one-chip microprocessor LSA circuit Display – 13mm with contrast adjustment Lighting type – Daylight, Tungsten, Fluorescent, Mercury Measurement range – LUX 0- 50,000 LUX, 3 ranges - Foot candle 0 – 5,000 ft-cd, 3 ranges - Relativity – 0 – 1999% Sensor – Photo diode & color correction filter Memory – Max, Min and Average readings Sample Time – Approx 0.4 sec Zero Adj. – By push button Power off – manual off or auto shut off (after 10 min)

5. GENERAL SPECIFICATIONS (cont…) Data output – RS 232 PC serial Operating temperature - 0°C - 50°C (32°F - 122°F) Operating Humidity – Max 80% RH Power supply - 06P DC 9V battery (heavy duty) Weight – 335g/0.77IB (Included batteries) Size – 180 x 72 x 32 mm (7.1 x 2.8 x 1.3 inch) Accessories - instruction manual - Sensor cover

6. DIGITAL LIGHT METER 2001 CT Lutron LX-105 LIGHT METER 1 2 3 4 5 6 7 8 9 10 16 11 12 13 14 15 1- Display 2- Power Off/On 3- Data Hold Button 4- LUX/FC Button 5- Memory Record Button 6- Memory Call Button 7- Light Source Button 8- Zero button 9- % Button 10- Range Switch 11- LCD contrast adjust 12- Light Sensor 13- Sensor cover 14- Light sensor plug 15- Light sensor input socket 16- RS-232 Output 17- Battery compartment cover 17

7. MEASURING PROCEDURE Push Power Off/On Button Zero Adjust Procedures 1. Cover the light sensor-using the Sensor Cover 2. Slide the Range Switch to the 2000 LUX Position 3. Push the Zero Button-display will show zero values 4. Upon completion, remove the sensor cover Select the desired measuring unit by pressing the LUX/FC Button

8. Determine the lighting type by pressing the Light Source Select Button L= Tungsten, F= Fluorescent, S= Day Light, C= Mercury Select the max. Range using the Range Switch If display shows “- - - -”, it indicates an overload condition, select the next higher range If display shows “- - - -”, it indicates an out of range, select the next lower range Position the Light Sensor directly under light source

9. -On the 20000 LUX range, the last digit will be shown on the lower line of LCD display -On 50000 LUX range, the last two digit will be shown on the lower line of LCD display For example:- On the 20000 LUX range, if display show 1562 LUX 0

10. Data Hold During measurement, pushing the “Data Hold Button will hold the display values and the LCD will show “D.H” symbol To cancel the Data Hold function, press the Data Hold Button, once more

11. Relative % light measurement During measurement, press the “%” Button. The current measured value will indicated as 100% All the subsequent measurement will be indicated as percentage, relative to the value when the button was pressed The formula used is as shown below: The new light values The light values when the % button was pressed X 100 To de-activated- press “%” Button

12. Data Record (Max., min & Average reading The DATA RECORD function displays the max, min & Average readings. To start the Data Record function, press the “Record Button” once

13. With the “REC” symbol indicated on display C. Push the “CALL Button” once more – average (AVG) values A. Push the “CALL Button” once - maximum values (max) B. Push the “CALL Button” once again – minimum (Min) values To de-activate the Data Record function, Press the “Record Button” once again

14. BATTERY REPLACEMENT When the left corner LCD display show “LBT” -spec measurement may still be made for several hours after low battery indicator appears before the instrument become inaccurate

15. THANK YOU FOR YOUR ATTENTION