Extech Instruments Easy View Digital Light Meter Ea31 Users Manual
2015-02-06
: Extech-Instruments Extech-Instruments-Easy-View-Digital-Light-Meter-Ea31-Users-Manual-541782 extech-instruments-easy-view-digital-light-meter-ea31-users-manual-541782 extech-instruments pdf
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User's Guide EasyView Digital Light Meter Model EA31 Introduction Congratulations on your purchase of the Extech EasyView Digital Light Meter which measures the amount of light falling on a surface (illuminance) in Footcandles or Lux. This device measures up to 20,000 Fc and 20,000 Lux. Careful use of this meter will provide years of reliable service. Specifications Units Ranges and Resolution Lux 20.00, 200.0, 2000, 20.00kLux Foot-candles 20.00, 200.0, 2000, 20.00kfc Accuracy ± (3% rdg + 0.5% FS) ±( 4% rdg + 0.5% FS, if > 10,000lux or 1,000fc) General Specifications Display Over range indication Spectral response 3-1/2 digit, 2000 count LCD LCD displays ‘OL’ CIE photopic (CIE human eye response curve), Cosine corrected Spectral accuracy CIE V function (f’1 ï 6%) Measurement Repeatability ±2% Calibration Calibrated to a standard incandescent lamp at color temperature 2856ºK Temperature coefficient ±0.1% per oC Sampling rate 2.5 times per second Photo detector Silicon photo-diode and spectral response filter Operating conditions Temperature: 32 to 104oF (0 to 40oC); Humidity: < 80% RH Storage conditions Temperature: 14 to 140oF (-10 to 50oC); Humidity: < 80% RH Dimensions 5.91 x 2.8 x 1.4" (150 x 72 x 35mm) Weight Approx. 11.3 oz. (320g) with battery Photo Detector Dimensions 3.62 x 2.36 x 1.14” (92 x 60 x 29mm) Detector cable length 3’ (91cm) approximately Low battery indication “BT” appears on the LCD Power supply 6 ‘AAA’ cells; Battery life approx 400 hours 2 EA31 V2.0 06/06 Meter Description 1. 2. 3. 4. 5. 6. 7. LCD display Range button Power ON/OFF button lux / fc selection button Data HOLD button MAX/MIN button Photo sensor (lens cover not shown) (Tripod mount on rear of sensor) Note: Battery compartment is located on the rear of the instrument Spectral Sensitivity 3 EA31 V2.0 06/06 Operation Power ON or OFF Press the button to turn power on or off. Units of measure Press the lux / fc button to select the unit of measure. “fc” or “lux” will appear in the display. Light sensor 1. The light sensor is attached to the meter with a coiled cable which allows placement of the sensor up to approximately 3 feet from the meter. 2. The light sensor is a silicon photo diode and resides under the white domed lens. 3. To protect the lens from scratches, keep the protective cap on the sensor whenever the unit is not in use. 4. The back of the sensor has a tripod mounting hole. Taking measurements 1. Remove the protective cap from the sensor. 2. Place the sensor in a horizontal position at the measurement location. 3. Read the light level on the display. If the light measurement is out of range an “OL” indication will appear on the display. If the ‘OL’ appears, select a higher range by pressing the RANGE button. MX MN Function 1. Press the MX/MN button once to put the meter in MX/MN mode. The meter will now display the highest reading that occurs while the function is enabled. The “MAX” icon will appear in the display. 2. Press the MX/MN button again to display the lowest reading that occurs while the function is enabled. The “MIN” icon will appear in the display. 3. Press MX/MN again to toggle between the MAX and MIN readings. 4. To exit the MX MN mode and return to the normal real time display, press and hold the MX/MN button (2 seconds) until the MAX and MIN icons disappear. Data Hold Press the HOLD button to freeze the displayed reading. The 'H' hold icon will appear on the display. Press the HOLD button again to return to normal operation. 4 EA31 V2.0 06/06 Reference Foot candles Lux Typical Light Levels >10000 >107600 1000 to 10000 10760 to 107600 Sunlight Operating Table Assembly (fine) 100 to 1000 1076 to 10760 Football stadium Emergency room Drafting table Overcast day Assembly (general) Classroom 10 to 100 107 to 1076 Casual reading Shipping area Stairwell Auditorium ATM machine 1 to 10 10.7 to 107 Storage room Building entrance Parking lot Highway 0 to 1 0 to 10.7 f Full moon Foot-candle / Lux conversion 1 lux = .09290 foot-candles 1 foot-candle = 10.764 lux 5 EA31 V2.0 06/06 Maintenance Cleaning and storage 1. The white plastic sensor dome should be cleaned with a damp cloth when necessary. 2. Store the meter in an area with moderate temperature and humidity (refer to the operating and storage range in the specifications chart earlier in this manual). Battery Replacement When the battery voltage is low the ‘BT’ symbol will appear on the display. Replace the six (6) 1.5 ‘AAA’ batteries by removing the rear (center) battery compartment screw and accessing the battery compartment. Observe polarity when placing the batteries in the compartment. Ensure that the compartment cover is securely fastened when finished. 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. 6 EA31 V2.0 06/06 Warranty EXTECH INSTRUMENTS CORPORATION warrants the basic 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 EXTENSION 210 for authorization or visit www.extech.com for more 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. Support line (781) 890-7440 Technical support: Extension 200; E-mail: support@extech.com Repair & Returns: Extension 210; E-mail: 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 Copyright © 2004 Extech Instruments Corporation. All rights reserved including the right of reproduction in whole or in part in any form. 7 EA31 V2.0 06/06
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