Kimo LX 200 Manuale utente

LX 200

Luxmeter

Table of contents

1 Introduction...........................................................................................................................................4

2 General information..............................................................................................................................4

2.1 Factor value according to the light sources..................................................................................6

2.2 Order of magnitude of Lux according to applications...................................................................6

3 Operating principle...............................................................................................................................

3.1 Keyboard presentation..................................................................................................................

4 Setting..................................................................................................................................................8

4.1 Brightness.....................................................................................................................................8

4.2 About.............................................................................................................................................8

5 During measurement............................................................................................................................9

5.1 Unique range................................................................................................................................9

5.2 Instantaneous illuminance............................................................................................................9

5.3 Relative illuminance......................................................................................................................9

5.4 Uniformity....................................................................................................................................10

5.5 Temporal......................................................................................................................................11

5.6 Mapping......................................................................................................................................12

5. Instrument shutdown...................................................................................................................15

6 After measurement.............................................................................................................................15

6.1 Data reading...............................................................................................................................15

6.2 Data transfer...............................................................................................................................16

6.3 Reseting memory........................................................................................................................16

Running informations.........................................................................................................................1

.1 Overange....................................................................................................................................1

.2 Power source..............................................................................................................................1

8 Maintenance.......................................................................................................................................1

8.1 Servicing.....................................................................................................................................1

8.2 Regular checking........................................................................................................................1

8.3 Batteries replacement – adaptors...............................................................................................1

9 Main specifications.............................................................................................................................18

9.1 Range details..............................................................................................................................18

9.2 Specifications..............................................................................................................................18

9.3 Standards....................................................................................................................................18

9.4 Measuring capacity and storage.................................................................................................19

10 Delivery and packaging....................................................................................................................19

1 Introduction

LX200 luxmeter is a photometer for measuring illuminance, it is equipped with a photoelectric detector and with a silicon

photodiode coupled with a filter to modify its response and to get it as closed as possible of the reference function V(λ)

defined in the CIE (International Commission on Illumination) LX200 is hand-held autonomous instrument fully automatic

designed for measuring illuminance With its memory, it allows the storage of datasets for processing on a computer

Results are displayed in Lux or in footcandle and allows 5 measurement modes:

Instantaneous illuminance:

Displaying of instantaneous values, maximum and minimum values

Relative illuminance:

Allows a relative measurement to a reference point to quantify a light input or an illuminance decrease

Uniformity:

Calculation of the min / ave ratio for determination of illuminance uniformity at workstation according to NF EN 12464-

standards - 1 – Lighting of workplaces (inside)

Evolution of illuminance according to weather conditions:

Storage of temporal evolution of illuminance for the follow up of environment conditions

Mapping of illuminance – Spatial representation:

Realisation and storage of cartography of light environments Coloured representation according to levels obtained for

printing of report (on a computer such as PC)

These different measurement modes are compatible with the following standards :

NF EN 12464-1 – Lighting of workplaces (inside)

NF EN 12464-2 – Lighting of workplaces (outside)

NF EN 12193 – Lighting of sports facilities

Its sensor is composed of a silicon photodiode which spectral response corresponds to the photopic curve according CIE

standard

Small, with its LCD graphic display of 64*128 pixels resolution, using a high-tech electronics, LX200 is a powerful

instrument and easy to use

2 General information

Photometrical data

Photometrical data are data that allow to define the action of electromagnetic radiation on visual function of the eye of an

observer

The average standard eye, adopted by the CIE (International Commission on Illumination), is defined by a function of

relative spectral illuminance efficiency for day vision or photopic

4 General information

Photopic curve of spectral sensitivity of the

human eye in day vision

Luminous flux

The luminous flux of a source is the evaluation, according to eye sensitivity, of the quantity of radiated light

among space by this source It is expressed in lumen (lm)

Luminous intensity

Luminous intensity is the luminous flux emitted by solid angle unit in a given direction

It is measured in candela, equivalent to 1 lm/sr

Luminance

Luminance of a source is the ratio between luminous intensity emitted in a direction and the apparent surface of the

luminous source in the considered direction Luminance is expressed in candelas by square meter (cd/m2)

Illuminace

Illuminance of a surface is the ratio of luminous flux received to the area of thise surface Its

unit is the lux, equivalent to 1 lm/m2 It is also expressed in footcandle (fc) according the ratio : 1 fc = 10 76 lux

Use :

For each application, you should check the measurement technique to get valid and consistent results The way of using the instrument has at least

as much importance on the result than the instrument quality

Main parameters shall be taken into account:

1 Put correctly the LX200 cell according to the appropriate and representative plan of the current study (ex: workstation)

2 Avoid non-representative illuminance of the studied area

3 Sensibly move away from the cell to avoid creating attenuation area of illuminance

“Pause” and “relative level” functions integrated in the LX200 will allow in most cases to avoid specific problems

General information 5

2 1 Factor value according to the light sources

The following table indicates the factor value corresponding to different light sources with their examples The device is adjusted with an

incandescent standard white light source owning its own spectral response The following lighting sources have a different spectral response

Therefore, the presented coefficients in the following table enable to correct the measurement according to these different sources

The correction is carried out by multiplying the measured value by the F factor : Corrected value = F x measured value

Sources F Factor Examples

Fluorescent tube with three bands 1 149

High pressure mercury lamp 1 201

Sodium vapour lamp 1 179

Metal halide lamp with three additives 1 076

Rare-earth metal halide lamp 0 911

White led : neutral colour 0 961

Halogen quartz lamp / tungsten (standard source) 1

2 2 Order of magnitude of Lux according to applications

Here are a few examples of order of magnitude according to different current situations

Environment Lux

Outside with open air 500 to 25000

Outside with direct sunlight 50000 to 100000

Full moon night 1

Overnight lit street 20 to 70

Apartment well lit 200 to 400

Factory : electronic assembling 1500 to 3000

Hotel reception hall 200 to 500

Shop 750 to 1500

Hospital operating room 750 to 1500

Classroom 200 to 750

6 General information

3 Operating principle

3 1 Keyboard presentation

When being switched on, “measurement screen” is displayed From this screen, to go to the 4 different measurement screens, press on key

and keys are associated to each measurement modes

key allows to access to reading setting or data transfer screens To back to measurement screen press key

Operating principle 7

Function keys

Directly associated to text displayed shown above on display, they allow measurement

setting

Key leaves current screen”

Screen key

From measurement screens, give access to other screens

On/Off key

123

Uniformity Temporal Mapping

Temporal

Mapping Uniformity Data transfer

Instantaneous Relative

1. Screens representing the 5 different measurement modes

2. Reading and data transfer screens

Instrument offers 3 groups of screens

4 Setting

Accessible from the principal measuring screen by successive pushes on the key, those different screens allow setting of the

instrument They also inform users

4 1 Brightness

To optimize display reading, the operator can :

1 Adjust brightness by pressing and function keys

2 Backlight LCD display for a better reading in a dark place

No” means backlight is switch off and “Yes” it is switch on

In this last case, battery life is reduced by about 15%

The role of calibration screen essentially consists on recall calibration conditions and more

particularly the percentage of modification of the gain compared with a nominal calibration

Calibration is reserved to the builder or to the partnership laboratory

4 2 About

Information on origin of manufacture, reference standards and dates of last and next audits

By pressing and keys, you can choose languages

Pressing or allows to choose measurement unit: Lux or Footcandle

Note : lux or fc unit is independent of the chosen language

8 Setting

About

Brightness Calibration

About -English About - French

French EnglishEnglish

lux

3 – Setting screens

5 During measurement

5 1 Unique range

The digital processing of the instrument avoids for the operator the choice of a measuring

range, LX200 displays the result of the measurement in lux or fc on all of its dynamic To

cover the whole field, different formats and units are directly displayed

5 2 Instantaneous illuminance

Once switched, the instrument displays twice a second the instantaneous value of illuminance expressed in Lux or fc This value gives information

about illuminance local conditions

Max and min values are also displayed

The operator can at any time by pressing following keys:

 : reset max and min values

: activate pause function then

 : continue measurement

5 3 Relative illuminance

Principle :

To know the contribution on the measurement result by providing or deleting a luminous source, LX200 allows a relative measurement from an

existing situation

For example : Knowing the incidence of deletion or addition of lighting (neon tube) in a room

Proceed as follows:

From the start screen, here is how to proceed to make a measurement of relative illuminance :

1 x : access to measurement screen. The function is not launched yet

1x : Press Zr key Screen displays :

Down: instantaneous value of illuminance (here 598 9 lux) which will be the reference value

It stays memorised and fixed

Up: value of instantaneous fluctuating illuminance (here 1268 lux)

In the middle: In R panel, difference between the instantaneous value displayed at the top

and the reference value memorized at the bottom This value can be positive or negative

according to fluctuations of illuminance compared with the moment of memorization of the

reference value ( key )

During measurement 9

Lux mode Footcandle mode

Instantaneous

illuminance

Rel

Inst

Example 1

Example 2

Reference illuminance

Instantaneous fluctuating

illuminance

Relative illuminance

Reference illuminance

Instantaneous fluctuating

illuminance

Relative illuminance

5 4 Uniformity

Principle:

From sampled data, the instrument calculates and displays on the measurement time:

Instantaneous value at the rate of two displays per second

Average value

Max and min values

Uniformity of illuminance: définined as the min / average ratio

From start screen (a), here is how to proceed to calculate the uniformity on a time controled by chronometer and clock:

2 x access to measurement screen Uniformity (b) Measurement is not launched yet

1x : launching of the chronometer, it displays seconds -minutes-hours-days (max : 01D00H00M00) The first values, Average, max

and min are displayed, calculation of uniformity is in progress and changes according to illuminance conditions (c)

During the measurement, no other function is accessible

1x : stop the measurement, two possibilities for the operator (d) :

1- He wants to store in memory the results

2- He ignores the measurement and launch a new measurement or erase results already acquired

To store results, press key, a little progress bar visualizes the action (f)

To erase results and launch a new measurement : press key, a flashing pictogram indicates that the measurement made is not taken into

account and that a new launching is possible (e)

Press to back to the initial state

Press to erase results An erase bar indicates the progress The operator can launch a new measurement (g)

10 During measurement

2 x Inst

Start screen

Measurement

stop

Sto

Storing of results

Erasing of results

(a) (b) (c) (d)

(e) (f)

(g)

Inst

Sto

Indice

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