MARTINDALE LM90 Manual de usuario

MARTINDALE

ELECTRIC

Trusted by professionals

Martindale Electric Company Ltd was founded in 1928 and

manufactures a large range of electrical test equipment.

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Martindale Electric Company Limited

Martindale Electric Co Ltd,

Metrohm House, Imperial Park, Imperial Way, Watford,

Hertfordshire, WD24 4PP, UK

Tel: +44 (0)1923 441717 Fax: +44 (0)1923 446900

E-mail: [email protected]

Website: www.martindale-electric.co.uk

E+OE. © Martindale Electric Co. Ltd. 2004

INSTRUCTIONS

LM90/92 LIGHTMETERS

Martindale Electric will carry out routine

calibration (on a chargeable basis) if the

instrument is returned, carriage paid, to

the address on the final page of this

document. Alternatively, a chargeable

collection and return service is available.

Repair & Service

There are no user serviceable parts in

this unit. Return to Martindale Electric

Company Ltd if faulty. Our service

department will promptly quote to repair

any faults that occur outside the

warranty period.

Storage Conditions

The unit should be kept in warm, dry

conditions away from direct sources of

heat or sunlight, with the battery

removed 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.

INTRODUCTION

This instrument is a portable easy to use 3½ digit, compact digital lightmeter

designed for simple one hand operation. It provides measurements in lux and fc

units. The meter has a backlit LCD display, PEAK-HOLD (50m pulse light) and

DATA-HOLD features.

THIS MANUAL COVERS MODELS LM90 & LM92

SAFETY INFORMATION

Read the safety and operation instructions before using the lightmeter.

SPECIFICATIONS

GENERAL

Display: 3½ digit liquid crystal display (LCD) with maximum reading of 1999

Over range: (OL) is displayed

Low battery indication: the " " is displayed when the battery voltage drops

below the operating level

WARNING

• 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 photodiode sensor

life.

2 7

Warranty

Faults in manufacture and materials are fully guaranteed for 2 years from date of

invoice and will be rectified by us free of charge, provided the unit has not been

tampered with and is returned to us with its housing unopened. Damage due to

dropping, abuse or misuse is not covered by the guarantee. Nothing in these

instructions reduces your statutory rights.

Measurement rate: 2.5 times per second, nominal.

Operating Environment: 0°C to 50°C (32°F to 122°F) at< 70% relative humidity

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), <70% relative humidity

Battery: Standard 9V battery (NEDA 1604, IEC 6F22 006P)

Battery Life: 200 hours typical with carbon zinc battery

Dimensions (HxWxD): 190mm(H) x 65.5mm(W) x 35mm(D)

Weight: 210g including battery

ELECTRICAL

Photometric Formulas:

10.764·footcandles=lux(lumens/meter2)

0.0929·lux=footcandles(lumens/foot 2)

Range LM90: 20lux, 200lux, 2000lux, 20klux

20fc, 200fc, 2000fc, 20kfc

Range LM92: 200lux, 2000lux, 20klux, 200klux

200fc, 2000fc, 20kfc, 200kfc

Resolution: 0.1lux, 0.1fc

Spectral response: CIE photopic

Acceptance angle: ƒ'2<3% cosine corrected (150°)

Total accuracy for CIE standard illuminant A (2856K): ±(3%rdg + 10dgts)

Temperature Coefficient: 0.1x (specified accuracy)/°C (<18°C or >28°C),

0.056x(specified accuracy)/°F(<64.4°F or >82.4°F)

Peak Hold response time: >50mS pulse light.

CIE Photopic Curve

SEE TABLE ON NEXT PAGE

OPERATOR MAINTENANCE

Battery Replacement

Power is supplied by a 9 volt "transistor" battery. (NEDA1604, IEC 6F22). The

" " appears on the LCD display when replacement is needed. To replace the

battery, remove the two screws from the back of the meter and lift off the battery

cover. Remove the battery from the battery contacts.

The CIE photopic curve is an international standard for the colour response of

the average human eye

CIE standard illuminant A can be realised 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

OPERATING INSTRUCTIONS

Push buttons

Peak-Hold Switch:

Press "PEAK" button to toggle in and out of the PEAK-HOLD mode. The " "

indicator is displayed. (Response Time: >50mS)

Display Back-Light Button

Pressing " " button to turn on the Back-Light.

Pressing " " button to turn off the Back-Light.

HOLD (DATA-HOLD) Button

Press "HOLD" button to toggle in and out of the DATA-HOLD mode. In the

DATA-HOLD mode, the " "indicator is displayed and the last reading is held

on the display.

OPERATION

1. Set the function switch to the desired lux or fc units.

2. Remove the sensor head cover.

3. Hold the sensor head steady and make certain that the light source

completely fills 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, set RANGE switch 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 simultaneously, take special care

to avoid reflections or shadowing the sensor with your body.

• For best accuracy, repeat the measurement several times to ensure that the

light source has remained stable.

• Avoid flexing the cable excessively at either end of the cable.

• The Inverse-square Law

The law states 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/d2.

• Cosine Law

The law that the illuminance on any surface varies as the cosine of the angle of

incidence. The angle of incidence θis 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 θ)/d2.

Cleaning

Periodically wipe the case with a damp cloth, do not use abrasives or solvents.

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