General Tools DLM204 User Manual
WIDE RANGE
SINGLE PIECE
DIGITAL LIGHT METER
USER’S MANUAL
DLM204
Please read this manual carefully and thoroughly before using this product.
TABLE OF CONTENTS
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 –3
Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 –4
Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
What’s in the Package . . . . . . . . . . . . . . . . . . . . . . . . 4
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . 4 –5
Setup Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Install Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Operating Instructions . . . . . . . . . . . . . . . . . . . . . 6 –9
Choosing the Right Range . . . . . . . . . . . . . . 6 –8
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 9 – 10
Operating & Maintenance Tips . . . . . . . . . . . . . . . . 10
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . 11
Return for Repair Policy . . . . . . . . . . . . . . . . . . . . . . 12
INTRODUCTION
Thank you for purchasing General Tools & Instruments’
DLM204 Wide Range Single Piece Digital Light Meter. Please
read this user’s manual carefully and thoroughly before using
the instrument.
The DLM204 is a general-purpose handheld instrument
suitable for measuring the intensity of visible light in
commercial, industrial, and consumer settings such as
offices, factories, hospitals and schools. Applications include
compliance with safe lighting regulations, facilities
management, security, photography, videography,
engineering, construction and surveillance.
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The meter displays measured light intensity in either of two
units: lux and foot-candles. The lux is the standard
international unit of illuminance, or how much luminous flux
is spread over a given area. One can think of luminous flux as
a measure of the total amount of visible light present, and
illuminance as a measure of the intensity of illumination on a
surface. A given amount of light will illuminate a surface more
dimly if it is spread over a larger area, so illuminance is
inversely proportional to area.
The standard international unit of luminous flux is the lumen,
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and one lux is equal to one lumen/m
. For perspective on lux
readings from the natural world, a moonless clear night sky
has an illuminance of about 0.002 lux, while direct sunlight
has an illuminance of 30,000 to 130,000 lux.
The foot-candle (or lumen per square foot) is a non-standard
unit of illuminance. Like the Btu, it is mainly in common use
only in the U.S., particularly in construction-related
engineering and building codes.
Lux and foot-candles are different units of the same quantity.
One foot-candle (ft-cd) = 10.764 lux, and 1 lux = 0.0929 ft-cd.
The DLM204 has a 2 in. diagonal LCD with 1 in. high digits.
The meter is powered by a “9V” battery (included in the
package).
KEY FEATURES
• Readings displayed in lux or foot-candles
• Choice of four ranges for each unit
• Large 2000 count LCD
• Uses cosine angular correction, silicon photodiode and
filter to approximate relative spectral response curve
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used by the International Illumination Commission (CIE)
and adopted by Japanese Industrial Standard C
1609:1993
• Zero adjustment • Max memory + data hold
• Low battery and overload indications
• One-handed operation • CE and RoHS approved
• 1-year limited warranty
SAFETY INSTRUCSSTIONS
Do not operate the DLM204 in the presence of combustible
gases or combustible materials (including dust in high
concentration).
WHAT’S IN THE PACKAGE
The DLM204 is packaged in a white box along with a soft
pouch, a “9V” battery and this user’s manual
PRODUCT OVERVIEW
The figure at right shows all
controls, indicators and
physical features on the front,
back and right side of the
DLM204. Familiarize yourself
with their positions and
functions before moving
on to the Setup
Instructions.
쐅
The DLM204’s controls,
indicators and physical
features
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