User`s Guide Digital Light Meter Model 403125
Contents
1. AAA 1 5V batteries observing polarity 4 Replace the battery compartment cover and secure the compartment screw Cleaning Use only a lightly damp cloth to clean the meter Do not use abrasives solvents or harsh detergents Keep the plastic sensor dome clean and free from scratches it may be cleaned with a soft cloth and isopropyl alcohol Typical Light Levels for general reference only Foot candies Lux Typical Light Levels gt 10000 gt 107600 Sunlight 1000 to 10000 10760 to 107600 Operating Room 100 to 1000 1076 to 10760 Assembly fine Football stadium Emergency room Drafting table 10 to 100 107 to 1076 Overcast day Assembly general Classroom Casual reading Shipping area Stairwell Auditorium 1to 10 10 7 to 107 ATM machine Storage room Building entrance Parking lot 0to1 0 to 10 7 Highway Full moon 403125 V3 1 9 06 Calibration and Repair Services Extech offers repair and calibration services for the products we sell Extech also provides NIST certification for most products Call the Customer Service Department for information on calibration services available for this product Extech recommends that annual calibrations be performed to verify meter performance and accuracy a Support line 781 890 7440 Technical support Extension 200 E mail support extech com Repair amp Returns Extension 210 E mail2. Sensor sensor cover not shown 5 Sensor mounting plugs Fits into docking jacks at top of meter 6 Docking jacks Sensor can be attached here for storage or while measuring 7 Function switch Three positions OFF LUX and FC 8 Handle and battery compartment rear 9 Analog output jack Backlight 3 and PEAK button Momentarily press this button to activate deactivate the Peak Hold function The display icon will appear In the Peak Hold mode of operation only the highest reading will be displayed Press and hold this button for 2 seconds to switch on the backlight Press and hold this button again for 2 seconds to turn the backlight off RANGE button Press to select the desired lux or fc range Each press of the RANGE button selects a new range The available ranges are 20 200 2000 and 20 000 lux or foot candles Displays in the 20 000 range must be multiplied by 10 HOLD button Press to freeze the displayed value the E icon will switch on Press again to exit the Data Hold mode 4 403125 V3 1 9 06 Operation Set the function switch to the desired unit of measure lux or fc Remove the light sensor cover Hold the sensor head steady or place it in a secure area and allow the sensor to collect light The light must encompass the entire sensor dome Ensure that the user does not cast a shadow on the sensor dome The sensor is connected to the meter by a 4 1 5m cable W
3. repair extech com Product specifications subject to change without notice For the latest version of this User s Guide Software updates and other up to the minute product information visit our website www extech com Extech Instruments Corporation 285 Bear Hill Rd Waltham MA 02451 Copyright O 2006 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 8 403125 V3 1 9 06
4. User s Guide EXTECH INSTRUMENTS Digital Light Meter Model 403125 Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment a six month limited warranty applies to sensors and cables If it should become necessary to return the instrument for service during or beyond the warranty period contact the Customer Service Department at 781 890 7440 ext 210 for authorization or visit our website www extech com for contact information A Return Authorization RA number must be issued before any product is returned to Extech The sender is responsible for shipping charges freight insurance and proper packaging to prevent damage in transit This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification improper maintenance or repair or unauthorized modification Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct indirect incidental or consequential damages Extech s total liability is limited to repair or replacement of the product The warranty set forth above is inclusive and no other warranty whether written or oral is expressed or implied Introduction Congratulations on your purchase of the Extech 403125 Digital Light Meter This portable compact light me
5. d nominal Four 4 1 5V AAA batteries 200 hours typical Battery symbol is displayed when the battery power drops below the operating voltage 32 to 122 F 0 to 50 C lt 70 Relative Humidity 4 to 140 F 20 to 60 C lt 80 Relative Humidity with batteries removed 0 1mVDC per display digit 6 7 x 1 7 x 1 6 170 x 44 x 40mm Approx 7 76 0z 220g with batteries 20 200 2000 20 000 fc and lux note that the 20 000 range is displayed in the x10 mode meaning that the display must be multiplied by 10 0 01 lux fc maximum 20 200 ranges 5 of reading 10 digits 2000 20 000 ranges 3 of reading 10 digits Accuracy note Stated accuracy for 9 F at 73 F 5 C at 23 C lt 70 Relative Humidity CIE photopic Note The CIE photopic curve is an international standard for the color response of the average human eye The CIE standard illuminant A is defined as a gas filled Tungsten filament lamp operating at a correlated color temperature of 2856K 50ms minimum response time for the measurement of a light pulse f gt lt 2 cosine corrected 150 10 764 fc 1 lux lumens meter 0 0929 lux 1 fc lumens foot 0 056 times the specified accuracy per F lt 64 4 F or gt 82 4 F 0 1 times the specified accuracy per C lt 18 C or gt 28 C 3 403125 V3 1 9 06 Meter Description 1 LCD display 2 Pushbuttons Sensor cable Connects sensor to meter 4
6. ectly with the intensity I of a point source and inversely for the square of the distance d between the source and the point If the surface at the point is perpendicular to the direction of the incident light the law is expressed as E 1 d Cosine Law The law states that the illuminance on any surface varies with the cosine of the angle of incidence The angle of incidence 0 is the angle of the surface plane and the direction of the incident light The inverse square law and the cosine law can be combined as follows E I cos 6 d 5 403125 V3 1 9 06 CIE Photopic Curve CIE Photopic Curve 80 60 20 Lumen Watt Conversion Factor Luminous Efficiency Coefficient o 420 450 500 540 580 620 660 700 nm w 3 o Wavelength in Nanometers Analog Output The meter can be connected to a chart recorder or other analog recording device via the output jack at the bottom of the meter A mono two wire 2 5mm plug and cable not supplied are required The analog output is 0 1mVDC per display digit 6 403125 V3 1 9 06 Maintenance Battery Replacement When the battery power falls below the operating voltage the battery symbol appears on the display If the battery symbol appears on the LCD or if the LCD does not switch on when the meter is turned on replace the batteries as follows 1 Remove the Phillips screw on the back of the meter 2 Open the battery compartment 3 Replace the four 4
7. hile measuring the sensor can be kept docked on the meter as it is shipped or it may be disconnected and used remotely Read the illuminance value on the display If the approximate magnitude of the light is not known step through the ranges using the RANGE button until a measurement is displayed If x10 appears on the LCD the meter is in the 20 000 range and the reading must be multiplied by 10 The OL overload icon appears if readings are out of range While taking a measurement press the HOLD button to freeze a displayed reading Press HOLD again to release the displayed reading The icon will appear on the display when the meter is in the HOLD mode If itis desired to know only the highest reading of a given measurement period press the PEAK button at the start of a measurement period The display icon will switch on in the PEAK mode and the display will only show the highest reading Momentarily press the PEAK button again to exit the PEAK mode Press and hold the PEAK button for seconds to activate the display backlight Press and hold the PEAK hold button again for 2 seconds to switch the backlighting off Cover the sensor when not in use Measurement Considerations di For best results repeat measurements several times to ensure that the light source has remained stable Avoid flexing the cable excessively at either end The Inverse Square Law The law states that the illuminance E at a point on a surface varies dir
8. ter provides lux and fc measurements This meter includes a backlit LCD display and offers PEAK HOLD and DATA HOLD functionality This meter is shipped fully tested and calibrated and with proper use will provide years of reliable service Safety Instructions lt is recommended that the user read and understand the safety and operational instructions before using the light meter Please read the following WARNINGS e To avoid electrical shock do not operate this meter in wet or damp conditions Do not immerse the meter in liquid For cleaning instructions refer to the maintenance section of this manual e To avoid injury and fire hazard do not use this meter in potentially explosive environments e To avoid eye injury wear eye protection if there is the possibility of exposure to high intensity light rays e Cover the sensor head when not in use This will extend the life of the photo diode employed in the sensor head 2 403125 V3 1 9 06 Specifications General Specifications Display Over range indication Measurement rate Battery power Battery life Low battery indication Operating conditions Storage conditions Analog output Dimensions Weight Electrical Specifications Ranges Resolution Accuracy Spectral response Peak Hold response Acceptance angle Units conversion Temperature Coefficient 3 digit backlit LCD display reads 0 to 1999 OL over load is displayed 2 5 readings per secon
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