DIGITAL LIGHT METER

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

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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

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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)
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GENERAL SPECIFICATIONS (cont)
Data output RS 232 PC serial Operating
temperature - 0C - 50C (32F - 122F) 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
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DIGITAL LIGHT METER
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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
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2001
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LIGHT METER
CT Lutron LX-105
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15- Light sensor input socket 16- RS-232
Output 17- Battery compartment cover
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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
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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
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-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
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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
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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
X 100
The light values when the button was pressed
To de-activated- press Button
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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
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With the REC symbol indicated on display
A. Push the CALL Button once - maximum values
(max)
B. Push the CALL Button once again minimum
(Min) values
C. Push the CALL Button once more average
(AVG) values
To de-activate the Data Record function, Press
the Record Button once again
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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
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THANK YOU FOR YOUR ATTENTION