Manual - General Tools And Instruments
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1. Measurement Accuracy 3 of reading for standard incandescent lamp operating at 2856 K 6 to 8 for other visible light sources incandescent fluorescent high pressure sodium and metal halide lamps Angular Deviations from Cosine Characteristics 2 30 6 60 25 80 Ranging Type Manual only Display Type amp Size 2 in 50mm diagonal LCD with 1 in 25mm high digits Display Resolution Refresh Rate 2000 counts 2 5 times second Light Sensor Type Silicon photodiode Environmental Classification Pollution Degree 2 offices laboratories and test stations Operating Temperature 14 to 122 F 10 to 50 C lt 80 RH Operating Altitude Up to 2000m 6561 ft Storage Temperature 14 to 122 F 10 to 50 C lt 70 RH Dimensions 6 7 x 2 2 x 1 5 in 172 x 55 x 38mm Weight including battery 8 8 oz 250g Power Source 1 9V battery NEDA 1604 IEC 6F22 JIS 006P OPERATING amp MAINTENANCE TIPS Keep the light sensor clean and covered by the protective cap when the meter is not in use When the icon appears on the LCD it s time to replace the 9V battery that powers the meter although measurements will remain valid for several hours after the low battery indicator first appears To replace the battery follow the instructions on page 5 To avoid draining the battery prematurely remember to power off the meter after each measurement session The DLM204 has no Auto Power Off A2. PO function Remove the battery before storing the meter for an extended period of time months rather than weeks to minimize the risk of having the battery leak and damage or ruin the meter Every so often perform a rough calibration of the meter by 1 Selecting the 0 to 20 FC range and 2 placing the protective cap over the light sensor with the meter on If this does not produce a reading of 0 00 FC use the end of a paper clip to press the 0 ADJ button on the right side of the meter Try not to drop the meter And never disassemble it or immerse it in water doing so would void the limited warranty 10 WARRANTY INFORMATION General Tools amp Instruments General s DLM204 Wide Range Single Piece Digital Light Meter is warranted to the original purchaser to be free from defects in material and workmanship for a period of one year Subject to certain restrictions General will repair or replace this instrument if after examination the company determines it to be defective in material or workmanship The warranty period begins on the date of purchase You are encouraged to register your product online General will extend your warranty an additional 60 days if you register at www generaltools com ProductRegistry This limited warranty does not apply to damages that General determines to be from an attempted repair by non authorized personnel or misuse alterations normal wear and tear or accidental damage The defecti
3. 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 0c ccc eee eee eee eens 2 3 Key Features 0cc cece cece ee ee eeeee 3 4 Safety Instructions 000ccc eee eens 4 What s in the Package 000eeeeeeees 4 Product Overview 00ceceeeeeeeees 4 5 Setup Instructions 00cc cece eee eee 5 Install Battery 0c cece ees 5 Operating Instructions 000000 6 9 Choosing the Right Range 6 8 Specifications 0ccc cece eens 9 10 Operating amp Maintenance Tips 10 Warranty Information 000000eeeee 11 Return for Repair Policy 000e000es 12 INTRODUCTION Thank you for purchasing General Tools amp 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 2 The meter displays measured light intensity in either of two uni
4. ational Illumination Commission CIE and adopted by Japanese Industrial Standard C 1609 1993 e Zero adjustment Max memory data hold e Low battery and overload indications e One handed operation CE and RoHS approved e 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 The DLM204 s controls indicators and physical features 4 1 LCD 2 dy power button 3 M H button 4 Lx Fe button 5 D H button 6 R button 7 Light sensor with cap 8 0 ADJ hole on right side 9 Tripod mount on back 10 Battery compartment on back SETUP INSTRUCTIONS INSTALL BATTERY The DLM204 s battery compartment is under a cover on the lower back of the unit Callout 10 of the figure To open the compartment turn the meter over and slide the cover down in the direction of the OPEN arrow Plug the included 9V battery into the wired socket inside the compartment The terminals of the battery and the socket mate in only one way wi
5. ge Whichever range you choose will automatically become the default range used by the meter when it is powered up following a shutdown In other words the DLM204 remembers both the measurement unit and the measurement range in effect when it was last used To hold any reading freeze the display press the D H button Callout 5 D H will appear on the top line of the LCD This feature is useful for making measurements above your head below your knees or around a corner Held readings can be viewed at eye level later To release the display and resume making real time readings press the D H button again The DLM204 can also keep track of the maximum light levels measured during a measurement session the period of time that begins when the meter is powered on and ends when it is powered off 8 To display the maximum light level recorded during the current measurement session press the M H button Doing so will cause the term MAX to appear on the top line of the LCD above the highest maximum value recorded To return to displaying real time light level readings press the M H button again SPECIFICATIONS Overall Measurement Range 0 to 20 000 foot candles ft cd 0 to 200 000 lux Individual Ranges Resolutions 0 to 20 ft cd 0 01 ft cd 0 to 200 ft cd 0 1 ft cd 0 to 2 000 ft cd 1 ft cd 0 to 20 000 ft cd 10 ft cd 0 to 200 lux 0 1 lux 0 to 2 000 lux 1 lux 0 to 20 000 lux 10 lux 0 to 200 000 lux 100 lux
6. generaltools com DLM204 User s Manual Specifications subject to change without notice 2013 GENERAL TOOLS amp INSTRUMENTS NOTICE WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS MAN DLM204 12 17 13 12
7. hat produces a reading using the narrowest range of either measurement unit For example say that your reading is 12 24 FC on the 0 to 20 FC scale range Press the R button to switch to the wider 0 to 200 FC range and note that the readout changes to 12 2 FC Then press the R button again to switch to the even wider 0 to 2000 FC range The readout will change to 12 FC Clearly the reading of 12 24 FC produced by using the 0 to 20 FC range provides the most precise highest resolution measurement among the three ranges used in this example Each of the eight available ranges has an inherent measurement resolution the smallest change in a reading that it can resolve On the DLM204 the 0 to 20 FC range has the highest resolution because its readings are always integers followed by two decimal places The two ranges with the next best resolution are 0 to 200 FC and 0 to 200 LUX each can resolve measurements to one decimal place The other five available ranges have the worst resolution none of them can measure light levels with an accuracy of less than 1 lux or 1 foot candle For the sake of accuracy you should try to maximize the resolution of every measurement that you make by switching to the next narrowest range If doing so produces a reading with an additional decimal place your effort will be rewarded by a more accurate reading If switching to the next narrowest range produces an overload simply return to the previous ran
8. range CHOOSING THE RIGHT RANGE The DLM204 provides four manually selectable ranges for each of the two measurement units lux and foot candles FC Repeated presses of the R button Callout 6 cycle through the four ranges for each unit The following two graphics illustrate the sequence 20 B 200 2000 20000 FC and 200 B 2000 B 20000 gt 200000 LUX The measurement unit in use will determine which of the two graphics appears at the bottom of the LCD below the measured light level In each graphic there will be a line above or below one of the four values indicating that it represents the high end of the measurement range currently in use In the upper graphic at the bottom of the previous page the line above 2000 FC indicates that the currently selected range is 0 to 2000 foot candles In the lower graphic the line below 2000 LUX indicates that the currently selected range is 0 to 2000 lux Press the R button and note that doing so moves the overscore or underscore mark one step to the right above the next widest range unless the meter is already using the widest range In this case pressing the R button causes the mark to wrap around to the narrowest range on the left For any light level value the right measurement range is not just the one that avoids an OL or OL readout It is also the range that provides the reading with the highest resolution To illustrate this concept measure a dim light one t
9. th the smaller male terminal plugging into the larger female terminal Position the battery and socket in the compartment so the socket s wires run under the battery rather than above it To close the battery compartment 1 Cradle the meter face down in your off weaker hand 2 With your other hand position the cover above the battery so its flanged top edge is touching the top edge of the compartment 3 Place the tip of your index finger on the cover s ribbed area marked OPEN and the tip of your thumb near the cover s curved bottom edge 4 Push both ends of the cover down and forward until it snaps into place OPERATING INSTRUCTIONS To power the meter on or off press the green cy button Before making any measurements remove the cap covering the light sensor Callout 7 Do not detach the cap from the lanyard Begin by selecting a measurement unit lux or foot candles Pressing the Lx Fc button Callout 4 toggles between the two units When the DLM204 powers on it automatically resumes using the last unit selected In other words whichever measurement unit you select becomes the meter s default unit until you change it To make an initial measurement position the meter so the light sensor is as close to perpendicular to the source of light as possible If your reading is OL or OL there is enough light to overload the meter using its current measurement range You must switch to a wider measurement
10. ts 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 and one lux is equal to one lumen m2 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 e Readings displayed in lux or foot candles e Choice of four ranges for each unit e Large 2000 count LCD e Uses cosine angular correction silicon photodiode and filter to approximate relative spectral response curve 3 used by the Intern
11. ve unit must be returned to General Tools amp Instruments or to a General authorized service center freight prepaid and insured Acceptance of the exclusive repair and replacement remedies described herein is a condition of the contract for purchase of this product In no event shall General be liable for any incidental special consequential or punitive damages or for any cost attorneys fees expenses or losses alleged to be a consequence of any damage due to failure of or defect in any product including but not limited to any claims for loss of profits Register now at www generaltools com ProductRegistry to receive a 60 day extension to your warranty 11 RETURN FOR REPAIR POLICY Every effort has been made to provide you with a reliable product of superior quality However in the event your instrument requires repair please contact our Customer Service to obtain an RGA Return Goods Authorization number before forwarding the unit via prepaid freight to the attention of our Service Center at this address General Tools amp Instruments 80 White Street New York NY 10013 212 431 6100 Remember to include a copy of your proof of purchase your return address and your phone number and or e mail address Specialty Tools amp Instruments GENERAL TOOLS amp INSTRUMENTS 80 White Street New York NY 10013 3567 PHONE 212 431 6100 FAX 212 431 6499 TOLL FREE 800 697 8665 e mail sales generaltools com www
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