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IDEAL 61-681 Digital Light Meter Instructions

1. GENERAL Display 3 digit liquid crystal display LCD with maximum read ing of 1999 Total accuracy for CIE standard illuminant A EEE 3 rdg 10dgts CIE standard illuminant A can be realised by means of CLE standard source A which is defined as A gas filled tungsten filament lamp operating at a correlated colour temperature of 2856K Temperature Coefficient 0 1x specified accuracy C lt 18 C or gt 28 C 0 056x specified accuracy F lt 64 4 F or gt 82 4 F Peak Hold response time gt 50mS pulse light OPERATING INSTRUCTIONS Push buttons Back Light 3 gt 2sec and Peak Hold Switch Press this bution to toggle in and out of the PEAK HOLD mode The W P MAX annunciator are displayed Response Time gt 50mS Press this button for two seconds to turn the Back Light on As this also activates the PEAK HOLD mode briefly press the button ta return to normal display To tum the Back Light off press again for two seconds Range Seicct Button Press RANGE button to select the desired lux or fc range Each time you press RANGE button the range and the input range annunciator incremants and a new value is displayed Overrange OL is displayed Lew battery indication the C9 is displayed when the battery voltage drops below the operating level Measurement rate 2 5 times per second nominal Operating Environment 0 C to 50 C 32 F to 122 F at lt 70 relative humidi
2. 61 681 OPERATING INSTRUCTIONS DIGITAL MULTIMETER PLEASE READ THESE OPERATING INSTRUCTIONS CAREFULLY Misuse and or abuse of these instruments cannot be prevented by any printed word and may cause injury and or equipment damage Please follow all these instructions and measurement procedures faithfully and adhere to all standard industry safety rules and practices IDEAL INDUSTRIES INC Sycamore IL 60178 USA 800 304 3578 Customer Assistance www idealindustries com ND 1734 INTRODUCTION This instrument is a portable easy use 3 digit compact sized digital lightmeter designed for simple one hand opera tion Provides selected the lux and fe units Meter with Backlit LCD display PEAK HOLD SOmS pulse light and DATA HOLD feature SAFETY INFORMATION It is recommended that you read the safety and operation instructions before using the lightmeter WARNING e To avoid electric shock do not operate this product in wet or damp conditions To avoid injury or fire hazard do not operate this product in an explosive atmosphere To avoid eye injury wear eye protection if there is a possibility of exposure to high intensity rays Do not immerse in liquids clean the sensor head using only a damp cloth Cover sensor head when not in use to extend silicon photadiode sensor life The A symbol on the instrument indicates that the Operator must refer to an explanation in this manual SPECIFICATIONS
3. in Nanometers
4. tton to the highest range and reduce until a satisfactory reading is obtained 6 Cover sensor head to extend sensor life SPECIAL CONSIDERATIONS Keep the plastic domed cosine corrector clean and free of scratches It may be cleaned with a soft cloth and isopropyl alcohol When light is received from many directions simulta neously take special care to avoid reflections or shadow ing the sensor with your body For best accuracy repeat the measurement several times to ensure that the light source has remained stable e Avoid flexing the cable excessively at either end of the cable The Inverse square Law The law stating that the illuminance E at a point on a surface varies directly with the intensity I of a point source and inversely as the square of the distance d between the source and the point If the surface at the point is normal to the direction of the incident light the law is expressed by E I d Cosine Law l The law that the illuminance on any surface varies as the cosine of the angle of incidence The angle of incidence 8 is the angle between the normal to the surface and the direction of the incident light The inverse square low and the cosine law can be combined as E I cos 8 d Cleaning Periodically wipe the case with a damp cloth and detergent do not use abrasives or solvents CIE Photopic Curve onversion Factor 3 Luminous Efficiency Coeffictent Lumen Watt C Wavelength
5. ty Storage Temperature 20 C to 60 C 4 F to 140 F 0 to 80 R H with battery removed from meter Accuracy Stated accuracy at 23 C 5 C 73 F 9 F lt 70 relative humidity Battery 4 pes 1 5V AAA size UM 4 R03 Battery Life 200 hours typical with carbon zinc battery Dimensions 170mm H x 44mm W x 40mm D Weight 220g 7 7602 including batteries ELECTRICAL Photometric Formulas 10 764 footcandles lux lumens meter 0 0929 1ux footcandles lumens foot Range 20iux 200lux 2000lux 20000lux 20fc 200fc 2000fc 20000fce Resolution 0 01 ux 0 01 fe Spectral response CIE photopic The CIE photopic curve is an international standard for the color response of the average human eye Acceptance angle f lt 2 cosine corrected 150 HOLD DATA HOLD Button Press HOLD button to toggle in and out of the DATA HOLD mode In the DATA HOLD mode the BI K annunciator is displayed and the last reading is held on the display OT ERATION Set the function switch to the desired lux or fc units 7 Remove the sensor head cover 3 Hold the sensor head steady and make certain that the light source completely filis the cosine correction dome 4 Move away from the sensor head to avoid shadowing it The sensor head has a 1 5 meter cable to allow separation between the observer and the measurement location 5 Read the illuminance value from the display If magnitude of lux or fc is not known press RANGE bu

IDEAL 61-681 Digital Light Meter Instructions

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