REED LM-81LX User manual

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Model
LM-81LX
Illuminometer
Instruction
Manual

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2
Table of Contents
Features......................................................................................... 2
Specications................................................................................ 3
Instrument Description .................................................................. 4
Measuring Procedures .................................................................. 4
Additional Functions...................................................................4-5
Hold Function ............................................................................. 4
Data Record Function ................................................................. 5
Auto Power Off .......................................................................... 5
Battery Replacement..................................................................... 5
Features
• Tiny bone shape with lightweight and small size case design are
suitable for handling with one hand
• Wristlet design provides extra protection to the instrument especially
for user one hand operation
• Exclusive photo diode and color correction lter light sensor, spectrum
meets C.I.E. photopic
• Built-in microprocessor circuit assures excellent performance and accuracy
• Concise and compact buttons arrangement, easy operation
• Memorize the maximum and minimum value with recall
• Lux/Foot-candle selectable by pressing button on the front panel
• Zero button design makes light meter calibration
• Hold function to freeze the current reading value
For service on this or any other REED product or information on other
REED products, contact REED Instruments at [email protected].

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3
Specifications
General Specifications
Display 13 mm LCD display
Measurement Light (Lux/Foot-candle)
Operating Humidity Max. 80% RH.
Operating Temperature 0 to 50°C (32 to 122°F)
Over Input Display Indication of “- - - -”
Power Supply 006P DC 9V battery (Heavy-duty type)
Power Consumption Approx. DC 6.2 mA
Weight 160g (battery included)
Dimensions 156 H x 60 W x 33 D mm (6.14 x 2.36 x 1.29”)
Accessories Optional carrying case also available (Model CA-52A)
Electrical Specifications (23 ± 5°C)
Measurement Range Resolution Accuracy
Lux 0 to 2,200 Lux 1 Lux
± 5% rdg ± 8 dgt
1,800 to 20,000 Lux 10 Lux
Foot-candle (Fc) 0 to 204.0 Fc 0.1 Fc
170 to 2,000 Fc 1 Fc
Foot-candle = Ft-cd = Fc

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Instrument Description
1 - Power Button
2 - Hold Button
3 - Max./Min. Button
4 - Zero Button
5 - Lux/Ft-cd button
6 - Light Sensor
7 - LCD display
8 - Battery Compartment / Cover
9 - Wristlet
Measuring Procedures
1. Power on the instrument by pressing the “Power Button” (#1, above).
2. Position the “Light Sensor” (#6, above) directly under the light source.
Meanwhile the light reading value will be displayed on the LCD display.
3. Press the “Lux/Ft-cd Button” (#5, above) to select measuring unit “Lux”
or “Ft-cd”
Zero Offset Adjustment of Light Function
• For best results you should zero the light sensor prior to use in a dark
environment. To achieve this, place the light sensor end of the meter
under a desktop or at surface to block any light. Press the “Unit/Zero
Button” (#4, page 5) setting the meter indication to zero.
• The zero point can drift due to environment temperatures, battery
power, as well as various other reasons. It is recommended that the
zero be checked frequently using the above procedure.
Additional Functions
Hold Function
Pressing the “Hold Button” (#2, above) will freeze the current value with a
“HOLD” symbol on the display. Press again to release the hold function.
continued ...

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Data Record Function
1. The Data Record function records & displays the maximum and
minimum reading values. Start the Data Record function by pressing
the “Max./Min. Button” (#3, page 4) once. There will be a “REC”
symbol on the display.
2. With the REC symbol on the display:
(a) Press the “ Max./Min. Button “ (#3, page 4) once and the “Max”
symbol along with the maximum value will appear on the display.
(b) Press the “Max./Min. Button” again, the “Min” symbol along with
the minimum value will appear on the display.
(c) To exit the memory record function, press the “Max./Min. Button”
continuously for at least 2 seconds. The display will revert to the
current reading.
(d) To clear the Max./Min. value recorded by pressing the “Hold Button”
(#2, page 4) once. The previously recorded Max./Min. value will be
lost and then revert to the REC. function continuing to record.
Auto Power Off
In order to prolong the battery life, the instrument has “Auto Power Off”
function. The meter will switch off automatically if no buttons are pressed
for around 10 minutes.
Battery Replacement
1. When the left corner of the LCD display shows the low battery symbol
“ ”, this indicates that replacement of the battery is then needed.
However specication measurements could still be taken for another few
hours before the meter becomes inaccurate.
2. Open the Battery Cover (#8, page 4) at the back of the meter and
remove the battery.
3. Replace with a 9V battery (alkaline or heavy-duty type)
and reinstall the cover.
For service on this or any other REED product or information on other
REED products, contact REED Instruments at [email protected].

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6
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