Manual - Martindale Electric
Contents
1. Cosine Law The illuminance on any surface varies as the cosine of the angle of incidence The angle of incidence 6 is the angle between the normal to the surface and the direction of the incident light The inverse square law and the cosine law can be combined as E I cos 8 d 3 12 CIE Photopic Curve Wavelengh CIE photopic Photopic nm luminous lumen watt efficiency conversion coefficient factor Vi 0 00004 0 00012 0 00040 0 00121 0 00400 0 01160 0 02300 0 03800 0 06000 0 09098 0 13902 0 20802 0 32300 0 50300 0 71000 0 86200 0 95400 0 99495 1 00000 0 99500 0 95200 0 87000 0 75700 0 63100 0 50300 0 38100 0 26500 0 17500 0 10700 0 06100 0 03200 0 01700 0 00821 0 00410 0 00209 0 00105 0 00052 0 00025 0 00012 0 00006 3 11 Spectral Mismatch Correction Factor Spectral mismatch is the result of the differences between the relative spectral responsivity of a light meter s sensor and the CIE photopic curve it is designed to simulate when the light meter is used to measure a light source with a different relative spectral power distribution to that of the light source used to calibrate the light meter The LM82 has been calibrated against a standard tungsten light source at a correlated colour temperature of 2856K Where the best possible accuracy is required when measuring another light source type it is suggested the LM82 should be calibrated for that light source type so as to determine the spect2. 82 ELECTRIC Light Meter GENERAL Display liquid crystal display Measurement rate once per second Power 2 x 1 5V AAA alkaline batteries IEC LR03 NEDA 24A Continuous operating time 180 hours typical Auto power off after approx 10 minutes Low battery indication This L is displayed when the battery voltage drops below the operating level Dimensions 132 9 L x 50 9 W x 24 7 D mm Weight 116g approx including batteries Includes protective cover 2 x 1 5V AAA batteries detachable carry strap and instructions ENVIRONMENTAL Operating environment 0 C to 50 C at lt 70 R H Storage environment 20 C to 50 C lt 80 R H with batteries removed EMC Conforms to BS EN61326 1
3. Pocket sized compact body 2 3 Accessories The LM82 comes with the following accessories 2x 1 5V AAA batteries Protective cover for safe storage Detachable carry strap Instructions 2 4 Battery Installation Refer to Section 4 1 Battery Replacement for the battery installation instructions for the LM82 3 4 Power On Off To power on in Measurement mode press for less than 1 second To power on in Set mode press for 2 seconds To power off the unit press for 2 seconds 3 5 Auto Power Off APO If the unit is inactive for a period of 10 minutes it will automatically power off To disable this function refer to section 3 7 3 6 Backlight Press for less than 1 second to turn on the backlight It will automatically turn off after 15 seconds if there is no further operation of the unit 3 7 Set Mode This mode sets Auto power off APO The Set mode is selected by pressing for 2 seconds with the unit powered off If the unit is switched off while in the Set mode the changed setting will not be saved and the unit will revert to the previous settings The LCD will display APO and the current setting will flash after entering the Set mode Press Ty to select ON or OFF as required Press D to save the setting and return to the Measurement mode 3 OPERATION 3 1 Low Battery Indication If the L is displayed the battery needs replacing as measurement accuracy can no longer be guaranteed see section
4. 4 1 Battery Replacement 3 2 Description of Press Buttons a Selects APO setting and lux or fc Turns on off the LM82 turns on backlight Selects Set mode and Hold mode functions 3 3 Description of LCD symbols APO g HOLD MAX MIN AVG naaa fc lux ENTER APO Autopoweroffisacive win minim recorded reading is dispiayea MAX MIN The difference between maximum and minimum recorded readings is displayed The average of recorded readings is displayed fe tux Units of measurement being displayed re Indicates press of aN button required ENTER indicates press of mope button required 3 8 Measurement Mode Referring to section 3 10 hold the LM92 so the light sensor is directed toward the light source Press A to select lux or fc as required Read the measured light intensity from the display While in Measurement mode all measured values are recorded at a rate of once per second for use by the Hold mode See section 3 9 3 9 Hold Mode The LM82 has the facility to display the maximum reading the minimum reading the difference between maximum and minimum readings and the average of the recorded readings To enter the Hold mode press mone while in Measurement mode The LCD will display HOLD and the last measured value will be held on the display Successive presses of the moe button will display the following in sequence HOLD MAX maximum recorded reading HOLD MIN minimum recorded reading HOLD MAX M
5. A aways READ THESE INSTRUCTIONS BEFORE PROCEEDING LM82 LIG HT M ETE R Thank you for buying one of our products For safety and a full understanding of its benefits please read this manual before use Technical support is available from 01923 441717 and support martindale electric co uk CONTENTS F 1 Safety Information instru cti on 1 1 Meaning of Symbols and Markings 1 2 Precautions Manual 2 Introduction 2 1 Inspection 2 2 Description 2 3 Accessories 2 4 Battery Installation OwWWwW Ww Ww 3 Operation 3 1 Low Battery Indication 3 2 Description of Press Buttons 3 3 Description of LCD Symbols 3 4 Power On Off 3 5 Auto Power Off 3 6 Backlight 3 7 Set Mode 3 8 Measurement Mode 3 9 Hold Mode Measurement Considerations Spectral Mismatch Correction Factor CIE Photopic Curve OmanN ODMH A aan kr amp fA Maintenance Battery Replacement Calibration Cleaning Repair amp Service MARTI N DALE 5 Storage Conditions B ELECTRIC Warranty Specifications 1 SAFETY INFORMATION 1 2 Precautions Please pay attention to the following cautions before use A Cautions These instructions contain both information and cautions that are The LM82 must only be used under the conditions and for the necessary for the correct operation and maintenance of this product purposes for which it has been constructed and specified It is recommended that you read the instructions carefully and ensure that the contents are fully
6. IN difference between max and min recorded readings HOLD AVG average of the recorded readings The unit will return to the Measurement mode at the end of the above sequence To clear the recorded readings press moe for 2 seconds at any point in the above sequence The unit will return to the Measurement mode Note The Hold mode will not function until at least 3 measurements have been stored to memory 3 10 Measurement Considerations Keep the plastic domed cosine corrector clean and free of scratches It may be cleaned with a soft cloth and isopropyl alcohol The light level measurement should be taken at the application height In an office the LM82 should be positioned at desk height and in a corridor it should be placed on the floor It is important that the light source completely fills the sensor with minimal movement of the meter during measurement It is also advisable where possible to hold the LM82 away from your body when taking measurements to avoid reflections or creating a shadow on the sensor For best accuracy repeat the measurement several times to ensure that the light source has remained stable The Inverse square Law The illuminance E at a point on a surface varies directly with the intensity 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
7. he limitations and exclusions of this warranty may not apply to every buyer If any part of any provision of this warranty is held invalid or unenforceable by a court or other decision maker of competent jurisdiction such holding will not affect 4 4 Repair amp Service There are no user serviceable parts in this unit other than those that may be described in section 4 Return to Martindale Electric if faulty Our service department will provide a quotation to repair any fault that occurs outside the guarantee period Before the unit is returned please ensure that you have checked the unit and batteries 4 5 Storage Conditions The instrument should be kept in warm dry conditions away from direct sources of heat or sunlight and in such a manner as to preserve the working life of the unit It is strongly advised that the unit is not kept in a tool box where other tools may damage it the validity or enforceability of any other provision or other part of that provision Nothing in this statement reduces your statutory rights Specification MARTINDALE g2 e eELECTRIC Light Meter All specified accuracies are at 23 C 5 C lt 70 R H for 1 year Temperature coefficient 0 1 x specified accuracy per C 0 C to 18 C 28 C to 50 C Range 0 to 200k lux 0 to 18580 fc Resolution 1 lux 0 to 19999 lux 10 lux 20k to 200k lux 1 fc 0 to 18580 fc Spectral response CIE photopic Relative spectral respo
8. nse f lt 8 Acceptance angle f lt 2 cosine corrected 150 Total accuracy for CIE standard illuminant A 2856K te2 3 rdg 10 dgts Note 1 The CIE photopic curve is an international standard for the colour response of the average human eye Note 2 The CIE standard illuminant A can be realized by means of CIE standard source A which is defined as A gas filled tungsten filament lamp operating at a correlated colour temperature of 2856K Check out what else you can get from Martindale 17th Edition Testers Accessories Motor Maintenance Equipment Multifunction Testers Calibration Equipment Non trip Loop Testers Continuity Testers Pat Testers amp Accessories Electricians Kits Phase Rotation Testers Environmental Products Proving Units Full Calibration amp Repair Service Socket Testers Fuse Finders Thermometers amp Probes Digital Clamp Meters Test Leads Digital Multimeters Voltage Indicators Specialist Metrohm Testers 4 amp 5kV Specialist Drummond Testers Labels Microwave Leakage Detectors MARTINDALE PR RBELEL TRIG Martindale Electric Company Limited Metrohm House Penfold Trading Estate Imperial Way Watford WD24 4YY UK Tel 44 0 1923 441717 Fax 44 0 1923 446900 E mail sales martindale electric co uk Website www martindale electric co uk 2014 Martindale Electric Company Ltd Registered in England No 3387451 E amp O E LITLM82 Document Rev1 Specification MARTINDALE
9. ral mismatch correction factor previously known as colour correction factor for that light source type Luminous Efficiency Coefficient QO 380 420 460 500 540 580 620 Wavelength in Nanometers 4 MAINTENANCE 4 1 Battery Replacement The battery compartment is on the rear of the unit Push the battery cover up towards the sensor and lift away from the back of the unit Replace with 2 new AAA batteries IEC LRO3 NEDA 24A observing correct polarity Replace the battery cover Note Do not mix old and new batteries 4 2 Calibration To maintain the integrity of measurements made using your instrument Martindale Electric recommends that it is returned at least once a year to an approved Calibration Laboratory for recalibration and certification Martindale Electric is pleased to offer you this service Please contact our Service Department for details Email service martindale electric co uk Tel 01923 650660 4 3 Cleaning If contamination is found clean with a damp soft cloth and if necessary a mild detergent Do not use abrasives abrasive solvents or detergents which can cause damage to the unit If a mild detergent is used the unit should subsequently be thoroughly cleaned with a water dampened soft cloth After cleaning dry and allow to remain in a dry environment for 2 hours before use 5 WARRANTY AND LIMITATION OF LIABILITY This Martindale produc
10. t is warranted to be free from defects in material and workmanship under normal use and service The warranty period is 2 years and begins on the date of receipt by the end user This warranty extends only to the original buyer or end user customer and does not apply to fuses disposable batteries test leads or to any product which in Martindale s opinion has been misused altered neglected contaminated or damaged by accident or abnormal conditions of operation handling or storage Martindale authorised resellers shall extend this warranty on new and unused products to end user customers only but have no authority to extend a greater or different warranty on behalf of Martindale Martindale s warranty obligation is limited at Martindale s option to refund of the purchase price free of charge repair or replacement of a defective product which is returned to Martindale within the warranty period This warranty is the buyer s sole and exclusive remedy and is in lieu of all other warranties expressed or implied including but not limited to any implied warranty of merchantability or fitness fora particular purpose Martindale shall not be liable for any special indirect incidental or consequential damages or losses including loss of data arising from any cause or theory Since some jurisdictions do not allow limitation of the term of an implied warranty or exclusion or limitation of incidental or consequential damages t
11. understood Before use check the unit for cracks or any other damage Make sure the unit is free from dust grease and moisture Do not use if damaged A REMEMBER SAFETY IS NO ACCIDENT Particular attention should be paid to the Precautions and Technical Specifications Please keep these instructions for future reference Updated Avoid severe mechanical shock or vibration and extreme temperature instructions and product information are available at www martindale electric co uk To avoid possible corrosion from leaking batteries remove the batteries if discharged or when the unit is not in use for an extended 1 1 Meaning of Symbols and Markings period A tion refer to instruction cautio E T aa Keep the plastic domed cosine corrector covered by the protective cover supplied when not in use C Equipment complies with relevant EU Directives tt End of life disposal of this equipment should be in accordance with relevant EU Directives 2 INTRODUCTION 2 1 Inspection Examine the shipping carton for any sign of damage Inspect the unit and any accessories for damage If there is any damage then consult your distributor immediately 2 2 Description The Martindale LM82 has the following functions and features Light intensity measurement to 200k lux 18580 fc Spectral response CIE photopic Hold Max Min Max Min and Average functions Auto power off Low battery indication LCD display with backlight
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