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 . . . . . . . . . . . . . .
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.
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).
1. LCD 2. (power) button 3. M-H button 4. Lx/Fc 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.
OPERATING INSTRUCTIONS To power the meter on or off, press the green 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.
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.
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.
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.
Operating Altitude: Up to 2000m (6561 ft.) Storage Temperature: 14° to 122°F (-10° to 50°C)@<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 & MAINTENANCE TIPS Keep the light sensor clean and covered by the protective cap when the meter is not in use.
WARRANTY INFORMATION General Tools & 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.
RETURN FOR REPAIR POLICY Every effort has been made to provide you with a reliable product of superior quality.
