INSTRUCTION MANUAL Models 401020 (Lux) and 401021 (Fc) Light Meter Adapters • Connects to standard DMM for display • Measures Tungsten, Fluorescent, Sodium, Mercury, and Daylight • Status LED for power and low battery • Battery operated 1. INTRODUCTION Congratulations on your purchase of Extech’s Light Adapter. This professional device, with proper care, will provide years of safe reliable service. 1 401020 and 401021 Ver. 1.03 11/99 2. SPECIFICATIONS 2.1 Electrical Specifications Accuracy Sensor Operating Temperature/humidity Power Supply Power Consumption Low battery indication Dimensions / Weight ± (5% + 1mV) Exclusive photo diode & color correction filter spectrum designed to meet C. I. E. o o o 32 F to 122 F (0C to 50 C) / <90% RH 006P DC 9V battery Approx. 6 mA DC Status LED on Front panel of Adaptor 3.9x1.9x1" (100x50x25mm) / 0.33 lbs. (150g) 2.2 Range Specifications Range 1 2 3 401020 Measurement Output to DMM 0 to 2000 Lux 0.1mV per 1 Lux 2000 to 20,000 Lux 0.1mV per 10 Lux 20k to 50k Lux 0.1 mV per 100 Lux 401021 Measurement Output to DMM 0 to 200 Fc 1mV per 1 Fc 200 to 2000 Fc 0.1mV per 1 Fc 2000 to 5000 Fc 0.1mV per 10 Fc 2.3 Frequency Spectrum 3. FRONT PANEL DESCRIPTION 1 Power ON status LED 2 Low battery status LED 3 Power ON / Range select switch 4 Light sensor 5 Meter to sensor connect cable 6 DMM banana connector plugs 2 401020 and 401021 Ver. 1.03 11/99 4. OPERATION 4.1 Insure that a fresh battery is installed in the adapter by moving the Power/Range Select switch from the OFF position to one of the range select positions. If the Power ON light doesn't glow or if the Low Battery LED does glow, check the battery. 4.2 Connect the adapter to the COMMON and VOLTAGE inputs of a multimeter via the adapter's banana plugs. The polarity of the connection should be reversed if a negative light level reading is indicated on the multimeter. 4.3 Set the mulitmeter to the mV or higher DC voltage position. Adjust the range to suit your display needs. Do not use autorange if possible. 4.4 Select the maximum range via the Range Select Switch and move lower in range as needed. 4.5 Hold the Light Sensor so that it faces the light source to be measured. The multimeter's display will indicate light level readings. Refer to Sections 5 and 6 for additional measurement considerations. 5. CORRECTION FACTOR FOR DIFFERENT TYPES OF LIGHTING The light adapter is calibrated using a precise "Standard tungsten light source of 2856oK". If the meter is to measure a different type of lighting, the correction factor table, below, should be applied to the readings. Multiply the multimeter readings by the factors in the right column for a particular lighting type shown in the left column. Lighting Type MERCURY LAMP FLUORESCENT LAMP DAYLIGHT SODIUM METAL HALIDE Multiplication Factor x1.14 x1.08 x1.00 x1.22 x1.00 6. RANGE SELECTION The meter has three measurement ranges (0-200, 0-2000, and 0-5000 Fc) or (0-2000, 020000, and 0-50000) Lux). The proper range selection will produce the most accurate reading. Always select the range that produces the maximum number of digits without exceeding the maximum count for that particular range. For example, a reading of 1456 Fc should be read on the 0 - 2000 range, not the 0-5000 range. 7. BATTERY REPLACEMENT When the Low Battery status LED glows, replace the battery as soon as possible. Open the Battery Compartment by removing the rear screw. Remove the battery, replace it with a fresh 9V battery and re-assemble the meter. 8. CALIBRATION / REPAIR SERVICES Extech offers complete repair and calibration services for all of the products we sell. For periodic calibration, NIST certification or repair of any Extech product, call customer service for details on services available. Extech recommends that calibration be performed on an annual basis to insure calibration integrity. 9. 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 on 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 for authorization. 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. 3 401020 and 401021 Ver. 1.03 11/99 TYPICAL LIGHT LEVELS Lux Foot Candles 20-75 75-150 150-300 300-750 750-1,500 1,500-3,000 2-7 7-15 15-30 30-75 75-150 150-300 75-100 100-200 200-750 7-10 10-20 20-75 Factories Emergency Stairs, Warehouse Exit/Entrance Passages Packing Work Visual Work: Production Line Typesetting: Inspection Work Electronic Assembly, Drafting Office Indoor Emergency Stairs Corridor Stairs Conference, Reception Room 750-1,500 75-150 Clerical Work 1,500-2,000 150-2000 Typing, Drafting Store 75-150 7-15 Indoors 150-200 15-20 Corridor/Stairs 200-300 20-30 Reception 300-500 30-50 Display Stand 500-750 50-75 Elevator 750-1,500 75-150 Show Window, Packing Table 1,500-3,000 150-300 Storefront, Show Window Lux Foot Candles 100-150 150-200 200-300 300-500 500-1,500 1,000-2,000 10-15 15-20 20-30 30-50 50-150 100-200 75-150 150-300 300-750 7-15 15-30 30-75 750-1,500 75-150 30-75 3-7 75-100 7-10 100-150 10-15 150-200 15-20 200-750 20-75 750-1,500 75-150 5,000-10,000 500-1000 Home Washing Recreational Activities Drawing Room, Table Makeup Reading, Study Sewing Restaurant Corridor Stairs Entrance, Wash Room Cooking Room, Dining Table Show Window Hospital Emergency Stairs Stairs Sick Room, Warehouse Waiting Room Medical Exam Room Operating Room Eye Inspection COMMON CONVERSION FACTORS 1 lm/m2 = 1 lux (lx) 10-4 lm/cm2 10-4 phot (ph) Illuminance (Visible Flux Density) 9.290 x 10-2 lm/ft2 9.290 x 10-2 foot-candles Luminance (Visible Flux Density per Solid Angle) Luminous Intensity (Visible Flux per Solid Angle) Luminous Flux ( Visible Flux) 1 lm/m2/sr = 1 candela/m2 1 lm/sr = 1 candella 1 lumen (lm) = 1.464 x 10-3 watts @ 555 nm Copyright © 1999 Extech Instruments Corporation. All rights reserved including the right of reproduction in whole or in part in any form. 4 401020 and 401021 Ver. 1.03 11/99