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...............................................................................................................................7
3.1 Keyboard presentation..................................................................................................................7
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
5.7 Instrument shutdown...................................................................................................................15
6 After measurement.............................................................................................................................15
6.1 Data reading...............................................................................................................................15
6.2 Data transfer...............................................................................................................................16
6.3 Reseting memory........................................................................................................................16
7 Running informations.........................................................................................................................17
7.1 Overange....................................................................................................................................17
7.2 Power source..............................................................................................................................17
8 Maintenance.......................................................................................................................................17
8.1 Servicing.....................................................................................................................................17
8.2 Regular checking........................................................................................................................17
8.3 Batteries replacement – adaptors...............................................................................................17
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 12464standards - 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
1 2 3
54
6
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
Brightness Calibration
+
-
About -English
About - French
French
EnglishEnglish
fc
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
Zr
Example 1
Example 2
Reference illuminance
Instantaneous fluctuating
illuminance
Relative illuminance
Reference illuminance
Instantaneous fluctuating
illuminance
Relative illuminance
Zr
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
or
(a)
(b) (c) (d)
(e)
(f)
(g)
Inst
Sto
5.5 Temporal
Principle:
The operator can follow the evolution of illuminance during a period of time at un fixed poste or not fixed.
Ex : evolution of street lighting on a firelane.
3 x access to measurement Tmp (b). The measurement is not launched yet.
Press on 1s to choose the sampling rate. Values available are : 1s – 2s – 3s – 5s – 10s – 30s – 1mn – 10mn.
Launch measurement by pressing key.
The chronometer indicates day-hours-minutes-seconds (max : 01D00H00M00). The first values, Average, max and min are displayed, calculation
of uniformity is in progress and changes according to illuminance conditions.
During the measurement, no other function is accessible. (c).
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.
1 - Press key to store results, a little progress bar visualizes the action (f).
2 - Press key erase results and launch a new measurement , 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.
During measurement 11
Inst
Sto
3 x Inst
Setting of sampling
rate
Start screen
Screen of
measurement time
Measurement
stop
Sto
Storing of results
Erasing of results
or
(a)
(b) (c) (d)
(e)
(f)
(g)
5.6 Mapping
Measurement principle:
The instrument allows to make a manual report of measurement point in an area to obtain a graphic representation of the distribution of the intensity
of illumination.
To do that, before making measurement, you have to define:
1. the area to be treated, if possible rectangular or square
2. the origine of the measurement beginning
3. the step of advencement of the measurement in column and points
Once these three things are definined, measurements have to be made manually in the spoted places.
Ex : mapping of a rectangular room of 5 m x 4 m.
Measurement is usually made at 0.5 m of wall.
The grid corresponds to:
Spacing between two columns: 1 meter
Spacing between 2 measurement points: 1 meter
The origin of measurement has to be fix and measurements have to be made imperatively according to a strict sequence.
According to possibilities of access to the room/area and the wanted graphic reprsentation, 4 choices are possible for origine of measurement:
Measurements:
• column 1 : from point 1 to point 5
• column 2 : from point 1 to point 5
• column 3 : from point 1 to point 5
• column 4 : from point 1 to point 5
• column 5 : from point 1 to point 5
• column 6 : from point 1 to point 5
Measurements:
• column 1 : from point 1 to point 6
• column 2 : from point 1 to point 6
• column 3 : from point 1 to point 6
• column 4 : from point 1 to point 6
• column 5 : from point 1 to point 6
12 During measurement
Colonnes
: 1 2 3 4 5 6
Points
5
4
3
2
1
Colonnes
: 6 5 4 3 2 1
Points
5
4
3
2
1
1 2
3 4 5 6
6 5 4 3
2 1
Points
: 1 2 3 4 5 6
Colonnes
5
4
3
2
1
Points
: 6 5 4 3 2 1
Colonnes
5
4
3
2
1
Particular cases:
Some points are inaccessible:
For example: because of unmovable or voluminous obstacles (tool machine – furnitures, ...)
In his case, points:
column 3 point 2
column 3 point 3
are inaccessible, the operator can't make the measurement, so he will enquiries the luxmeter by a
so called “no value” measurement.
When processing with the software, this last one will propose a value (average of attenant value) or
the operator will enquiries himself this value.
The room or the area is not a quadrilateral.
The operator organizes its dataset (column/points) as it was a quadrilateral.
When he arrives on his sequence of measurements:
column 4 point 1
column 4 point 2
he will enquiries the luxmeter by a so called “no value” measurement then he resumes
normally his sequence for the 3 following measurements.
Same thing for the two first measurements of the columns 5 and 6.
When processing with the software, value given by the software will be accepted by the
operator to get a correct graphic representation.
Make a measurement of mapping with LX 200 instrument:
From start screen, here is how to proceed to make a manual report of points and get a mapping of a room/area:
4 x access to measurement screen Cart (b).
Instrument proposes by default an advancement step of measurement:
- distance between columns: 1 m
- distance between measurement points: 1m
Modify the advancement step pressing key, then choose Column or Point with 1 key and set the distance of advancement with + and keys . Adjustment step is limited to 0.50 m (c).
Back to previous screen with key then press OK to go to à measurement screen (d).
From this screen, validate illuminance value corresponding to topographical coordinates by pressing key (e).
At each validation, instrument memorizes illuminance value, counter of point to validate increments of one and so as the last one validated. A little
black block visualizes the transfer of the point to validate toward the validated point.
If a measurement is not possible (see ''Principle'' part), before validate the measurement, press Pt key, to commute from Point (Pt) to “no value”
- - , then validate.
The instrument does not memorise any value. During the counting, this measurement will be automatically enquires by the software or the operator.
During measurement 13
Colonnes : 1 2 3 4 5 6
Points
5
4
3
2
1
Colonnes : 1 2 3 4 5 6
Points
5
4
3
2
1
Inst
Par.
Val.
Measurement error:
To make a new measurement in case of handling error or ambient condition unacceptable, press twice Pt key to back to the coordinates of the last
poin to re-measure. Make the measurement, validate and continue the sequence normally.
On the same principle, press Pt key the required number of time to back to the sequence of measurements already made (points et columns) and
repeat the entire sequence of measurements.
At the end of the sequence, for example Column 5 – Point 3, press key to back to dataset resume screen. (f).
Important elements are displayed: Min, Max, Average, Uniformity.
two possibilities for the operator:
1- He wants to store in memory the results.
2- He ignores the measurement and launch a new measurement or erase results already acquired.
Press key to store results, a little progress bar visualises the action (h).
To erase results launch a new measurement :
Press once ,a flashing pictogram indicates that made measurement is not taken into account and a new launch is possibme (g). Pressing
allows a return to initial state.
A second press on key deletes results. The operator can proceed to settings and launching a new measurement (i).
14 During measurement
Erasing of results
or
4 x Inst
Setting of the
advancement step of
columns and points
Start screen
(a)
(b)
(c)
(d)
(e)
(f)
OK
Par.
Val
(f)
(g)
(i)
Sto
5.7 Instrument shutdown
In case of accidental shutdown of the instrument (low batteries), results are automatically saved when the LX200 is operating in Temporal mode. For
other modes of measurement (Instantaneous – Relatve - Uniformity – Mapping), please check battery level before launching dataset.
6 After measurement
6.1 Data reading
After a requested shut-down of measurement and a data storage, it's possible to consulte dataset results:
Proceed as follow:
Go to reading screen.
From start screen, press twice (SCREEN).
With - and + keys, choose dataset, then validate with 1 key, result screen appears.
In case of accurate or localised control before a data transfer, it is possible to visualize stored data on the screen of the LX200. It is possible for
Temporal or Mapping modes.
• Temporal
After selecting in READING the dataset, press 1 key, reading screen of values appears:
- and + keys allow the scrolling of values, keep pressing on one opf the two buttons to make it scroll faster.
To leave this screen, press key.
• Mapping
After selecting in READING the dataset, press 1 key, reading of values screen appears:
- and + keys allow the scrolling of values.
To leave this screen, press key.
After measurement 15
Uniformity
Temporal
Mapping
6.2 Data transfer
This screen allows data transfer toward a computer trough USB cable.
LLX20 software have been previously loaded into the computer (see notice of
LLX 20 Software ).
Access Data transfer screen :
Link the instrument to the PC with a USB cable.
From start screen of the instrument, press 3 times key until the obtention of the data
transfer screen. Then press USB pictogram key.
The computer automatically detects the instrument on the proper port. Software allows only transfer, the instrument stays on hold. Date and time are
displayed (they can be set by the LLX20 software).
Files formats:
Files of values have a specific termination for each measurement modes :
• Uniformity: *.ldu
• Temporal: *.ldt
• Mapping: *.ldc
6.3 Reseting memory
After recording of dataset the operator can erase the memory of the instrument.
There are 2 methods :
Directly with the PC after file transfer
By pressing RESET key of the instrument
From start screen, press 3 times key, then once RESET key, press RESET again to erase all dataset or press key to cancel deletion.
16 After measurement
7 Running informations
7.1 Overange
Under conditions of measuring range excess, defined at 200,000 lux, an over-range pictogram appears. It comes fleetingly for an
illuminance exceeding 200,000 lux . Displayed value will be 200.1 klux.
7.2 Power source
When the instrument is equipped with alkaline batteries, it can operate for 72 hours minimum. A symbol informs the user about
electric power remaining. If battery is low, less than 1 bar on the pictogram, the instrument stops measuring, saves current
measurement and switches off.
8 Maintenance
8.1 Servicing
The LX 200 conception allows a reduced maintenance, which consists in changing batteries and cleaning the instrument and sensor with a slightly
dampened cloth. A particular attention must be paid to the white disc covering the silicon photodiode which surface must not have dirts or scratches.
8.2 Regular checking
Like most measuring instruments, it is strongly recommended to regularly control and calibrate LX200 instrument. The sensor sensitivity decreases
depending on measurement durations and illuminance intensity. Return to the manufacturer each year will provide necessary metrological
traceability.
8.3 Batteries replacement – adaptors
Batteries:
To replace batteries, open the back hatch and insert the 3 new batteries of type 1.5 V / AAA-LR3 inside.
Warning: respect meaning of batteries. If storage is very long, remove batteries.
Adaptor:
If necessary for a long period of measurement, use a USB adaptor.
Note: when using with an external power, it is recommended to remove batteries from LX100. An internal protection, however, allows to secure
all if you forget it.
Maintenance 17
9 Main specifications
9.1 Range details
Lux value Display Unit Lux resolution Accuracy*
From 0 to 10 From 0.0 to 10.0 lx 0.1
±2 % of reading or ±2 lux
From 10 to 99 From 10.0 to 99.9 lx 0.1
From 100 to 999 From 100.0 to 999.9 lx 0.1
From 1000 to 9999 From 1000 to 9999 lx 1
From 10000 to 99999 From 10.00 to 99.99 Klx 0.01
From 100000 to 200000 From 100.0 to 200.0 Klx 0.1
Fc value Display Unit Fc resolution Accuracy*
From 0 to 1 From 0.00 to 1.00 fc 0.01
±2 % of reading or ±0.19 fc
From 1 to 99 From 1.00 to 99.99 fc 0.01
From 100 to 999 From 100.0 to 999.9 fc 0.1
From 1000 to 9999 From 1000 to 9999 fc 1
From 10000 to 18580 From 10.00 to 18.58 Kfc 0.01
* All the accuracies indicated in this technical datasheet were stated in laboratory conditions, and can be guaranteed for measurements carried out in the same conditions, or carried out
with calibration compensation.
9.2 Specifications
Measuring range
0.0 to 200 000 lux
0.00 to 18 585 fc
Directional sensitivity (f2)
1
< 6%
Linearity (f3)
1
< 2%
Measurement capability See table p.18
Backlit LCD display
128 x 64
Conditions of use From 0°C to +50°C. In non-condensation condition. From 0 to 2000 m.
Storage temperature
From 0°C to +50°C
Housing dimensions without sensor 120 x 58 x 34 mm
Housing weight with sensor and batteries
185 g
Digital electronic Low drift
Conformity
Compliant with the RoHS directive
Power supply 3 batteries 1.5 V type LR3-AAA
Autonomy
72 hours minimum continuous operation.
European directives 2004/108/EC EMC; 2006/95/EC Low voltage; 2011/65/EU RoHS II;
2012/19/EU WEEE
Mini-USB plug
For USB power supply adapter, for data transfer
1
The f2 and f3 coefficient are defined according to the French NF C 42-710 standard.
9.3 Standards
This instrument is based on the recommendations and requirements of NF C 42-710 –February 1988 Class B – DIN 5032-7 and CIE n°69
standards.
18 Main specifications
9.4 Measuring capacity and storage
You can make 32 datasets with the luxmeter. Files can be memorised according to their modes: Uniformity – Temporal – Mapping.
Each dataset can contain 16370 values.
• Uniformity mode:
Max 24H of continuous measurement: 01J 00:00:00
• Temporal mode:
Measurement capacity is linked to sampling rate:
Sampling Measurement time
XXD HH:MM:SS
1s 00D 04:32:00
2s 00D 09:05:00
3s 00D 13:38:00
5s 00D 22:44:00
10s 01D 21:28:00
30s 05D 16:26:00
1 mn 11D 08:52:00
10 mn 99D 23:59:00
Mapping mode:
Each measurement uses 2 points of memory. So 8185 measurements can be stored, distributed between column and point.
Example: If there are 10 columns, number of points will be: 8185 / 10 = 818.
On the scale of users, the number of points per column is virtually unlimited.
10 Delivery and packaging
• LX200 housing with silicon photodiode sensor and glass filter correction.
• Transport case
• 3 LR3-AAA batteries
• Calibration certificate
• User manual
• LLX200 software
Delivery and packaging 19
NTang – LX200 –28/04/17 – RCS (24) Périgueux 349 282 095 Non-contractual document – We reserve the right to modify the characteristics of our products without prior notice.
Once returned to KIMO, required waste collection will be assured in the respect of the environment in accordance to 2002/96/CE guidelines relating to WEEE.
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