Sonel LXP-2 User manual

OPERATING MANUAL
DATA LOGGING LIGHT METERS
LXP-2, LXP-10B, LXP-10A
Version 1.00

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Digital data-logging light meters are precision instruments used to measure illuminance (lux and
foot-candles) in field conditions.
They meet the requirements of CIE spectral sensitivity curves for spectral response. Their
photoelement is cosine-corrected.
The meters are compact and durable units thanks to their simple-to-use design.
The photosensitive element used in these meters consists of a very stable and durable silicon
photodiode and spectral sensitivity filter.
The most important features of the devices include:
maximum resolution of light metering: 0.1 lx (0.01 fc) - LXP-2, 0.01 lx (0.001 fc) - LXP-10B, 0.001
lx (0.0001 fc) - LXP-10A,
high accuracy and fast response time,
Data-hold function for holding the measured values displayed on the screen,
automatic reset,
no need to use correction factors for different light sources, thanks to a very good adjustment of
spectral sensitivity ensuring correct measurements of light intensity regardless of the nature of ra-
diation,
short response times to changing light intensity,
"Peak-hold" function that enables the user to measure the peak signal of light pulse longer than
0.1 s (0.4 s for LXP-2 with probe LP-1) and shorter than 1 s,
automatic power off after 5, 10 or 15 minutes, or auto-off function
measurements of maximum and minimum values,
relative readings,
large and readable display with backlit function;
USB socket for connecting the meter to a PC,
data transmission via wireless (radio) link with an optional adapter OR-1 (only LXP-10B, LXP-
10A),
four measuring ranges - LXP-2, five measuring ranges - LXP-10B, six measuring ranges - LXP-
10A,
memory space for 99 results (LXP-2) or 999 results (LXP-10B, LXP-10A), that may be read on the
meter or on a PC,
data logger with a logging capacity of 16000 values.

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CONTENTS
1FUNCTIONAL DESCRIPTION ...................................................................................4
1.1 DESCRIPTION OF THE DEVICE...........................................................................................4
1.2 DISPLAY......................................................................................................................5
2SETTINGS...............................................................................................................5
3TAKING MEASUREMENTS......................................................................................5
4SPECIAL FEATURES ................................................................................................6
4.1 DATA HOLD MODE FOR HOLDING DISPLAYED DATA ...........................................................6
4.2 PEAK HOLD FUNCTION FOR READ-OUT OF PEAK VALUES.....................................................6
4.3 MAXIMUM AND MINIMUM VALUE MODE ..........................................................................6
4.4 RELATIVE MODE MEASUREMENT......................................................................................6
4.5 USB MODE ................................................................................................................6
4.6 WIRELESS (RADIO)TRANSMISSION MODE (ONLY LXP-10) ....................................................6
4.7 DISPLAY BACKLIGHT ......................................................................................................7
4.8 MEMORY FUNCTION .....................................................................................................7
4.9 DATA LOGGING FUNCTION .............................................................................................7
5CHARACTERISTICS OF SPECTRAL SENSITIVITY ........................................................8
6RECOMMENDED LIGHTING....................................................................................8
7CONNECTION ........................................................................................................9
8REPLACING THE BATTERY ......................................................................................9
9CLEANING AND MAINTENANCE.............................................................................9
10 STORAGE...............................................................................................................9
11 DISMANTLING AND DISPOSAL.............................................................................10
12 TECHNICAL SPECIFICATIONS ................................................................................10
13 STANDARD EQUIPMENT......................................................................................11
14 OPTIONAL ACCESSORIES .....................................................................................11
15 SERVICE...............................................................................................................12
16 LABORATORY SERVICES.......................................................................................12

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1 Functional Description
1.1 Description of the device
Power Button: Turns the light meter ON/OFF.
Liquid crystal display 3 3/4": digital display with a maximum reading of 3999, showing the symbols
of the measured values, symbols of functions, etc.
RANGE button: Manual change of the range or switching it to automatic.
LOGG button: turning data logger or backlight ON/OFF, erasing data logger memory.
ENTER/MEM button: Entering values into the measurement memory, viewing and deleting the
measurement memory.
SET button: Entering the meter settings.
HOLD button: Holding the displayed data or "up" cursor.
PEAK: Holding the peak values or "right" cursor.
MAX/MIN button: Reading the maximum or minimum value; or "left" cursor.
REL button: Relative measurement or "down" cursor.
Measuring head with a sensor.

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1.2 Display
The main read-out field.
Bar graph - analogue scale for showing rapid changes in light intensity.
Additional reading field
Symbols of sampling period and units.
Symbols for setting date and time.
Units.
Symbol of data logging.
Symbol of memory.
Additional reading field
Units.
Symbol of relative measurement.
Discharged battery symbol.
Symbol of MIN / MAX values (also for PEAK HOLD function).
Symbol of HOLD function.
2 Settings
Use SET button to enter the meter settings. The buttons and are used to set the param-
eter value, while and buttons are used to move to the next parameter. Settings are introduced
in the following order:
unit (lx or fc) → sampling period (every 1 s...60 s) → day → month → year → hour → minute → sec-
ond → sounds (On/Off) → AutoOFF (300 s, 600 s, 900 s, none (---)) → unit ...
Exit settings by pressing SET - selected/changed settings will be saved.
3 Taking measurements
Press the power button in order to switch the meter ON.
The device is in the automatic range selection mode. To enter the manual range selection mode,
press RANGE button for 2 sec. Ranges are switched by short pressing of RANGE button. The
range is displayed at the top of the display. Pressing the button again for 2 seconds will return the
device to the automatic range selection mode.
Remove the cover from the photodetector and point it perpendicularly to the light source.

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Read the nominal value of the lighting from the display.
If the instrument displays only "OL" symbol, it means that the input signal is too strong and you
need to set a higher measuring range.
After completing the measurement cover the photodetector with its cover and turn the meter OFF.
4 Special Features
4.1 DATA HOLD mode for holding displayed data
Press HOLD button to select the Data Hold mode. When HOLD mode is selected, the meter stops
the currently displayed result and shows it as numbers, whereas the bar graph continues to show
actual indications.
Press again HOLD again to exit Data Hold mode, the meter returns to normal operation.
4.2 PEAK HOLD function for read-out of peak values
PEAK HOLD function enables the user to measure the peak signal of light pulse longer than 0.1
s (0.4 s for LXP-2 with probe LP-1) and shorter than 1 s. The bar graph shows current result continu-
ously.
Press PEAK to enter Pmax data logging mode and place the device in the light measuring area.
Press PEAK button again to enter Pmin data logging mode.
Press PEAK button again to exit Peak Hold mode and return to normal operation.
4.3 Maximum and minimum value mode
Press MAX/MIN button to read the maximum value (MAX).
Press MAX/MIN button again to read the minimum value (MIN).
Press MAX/MIN button again exit this mode and return to normal operation mode.
The bar graph shows current result continuously.
4.4 Relative mode measurement
Press REL button to start the relative mode measurement. The displayed result is the difference
between the currently measured value and the reference value saved in the moment of pressing
REL button. If the new reading is identical to the reference value, then the display will show zero.
The bar graph shows current result continuously.
Press REL again to exit the relative measurement.
4.5 USB Mode
Connect the device to your computer via the USB port.
Start the program on your computer.
The meter operates in data reading mode.
To read the data stored in memory, use the appropriate commands in the software. The software
enables the user to select the type of the read memory: measurement memory or data logger
memory.
4.6 Wireless (radio) transmission mode (only LXP-10)
Connect the OR-1 module to the PC USB socket.
Start FOTON 12464 software.
In order to activate radio transmission function, press SET button and hold it pressed for 2 sec-
onds. Instead of showing the measurement range, the display will show message: .
On-line operation or data read-out using software commands.
Displaying the measurement range is the same as in USB mode.
To exit the function, again hold SET button pressed for 2 seconds.

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Note:
Standard PIN code for wireless (radio) transmission is "123".
4.7 Display backlight
Press the backlight button briefly to switch it ON.
Press the backlight button briefly again to switch it OFF.
4.8 Memory function
To save the current data in memory, press ENTER/MEM button and the display will show MEM for
3 seconds along with the cell number in which the measurement will be saved. Each new meas-
urement is saved automatically to the next available cell. When the memory is full, then after
pressing ENTER/MEM, instead of a cell number, the display will show ‘---‘ and the measurement
will not be saved.
To read measurement results from the memory - press and hold ENTER/MEM button pressed for
2 seconds. Use and buttons to scroll individual memory cells. The device will display:
measured value, unit, date and time of measurement (use and buttons) and information on
memory - main (general) memory or memory of individual functions e.g. Pmax, Pmin, MAX, MIN,
REL. The same data may also be accessed from your PC.
I order to return to the normal operation mode - press and hold ENTER/MEM button for 2 seconds.
To clear the memory, turn the meter ON while holding down ENTER/MEM button. The process of
erasing the memory lasts about 10 seconds. The main display will show and the cell number
display field will show numbers of cells decreasing to zero, indicting remaining cells to be erased.
After erasing the memory, the meter returns to the measurement mode
4.9 Data Logging function
Set the time and the sampling rate according to par. 2, the default sampling rate is 1 sec.
To start the data logging function, press and hold LOGG button for 2 seconds, the display will
show LOGG and free memory space will be displayed as a percentage value (from 100 to 0). The
memory stores data on measured value, its unit, date and time.
LOGG will blink at intervals equal to the set sampling period, indicating when the measurement is
taken.
When the memory is full, then the percentage value shown is 0 and a double beep is generated to
indicate ending the data logging process. If data logging mode is activated when the meter
memory is full, the meter after 2 seconds will exit this mode and LOGG symbol will disappear - af-
ter that a double beep is generated.
To stop the data logging function, press and hold LOGG button for 2 seconds, the meter will return
to the normal operation mode, data logging may be started from the beginning.
As data is logged in a separate memory, different than a single measurement, the user may save
single measurement results. This may be done by pressing MEM/ENTER button. In such case, the
display apart from LOGG symbol will additionally show MEM, and instead of the percentage value
of free memory space, the device will display the number of memory cell where the measurement
is saved.
To clear the memory of the meter, turn the meter ON while holding down LOGG button. The main
display will show and the percentage value field will show the amount of free space that will
change from 0 to 100 % when erasing progresses. After erasing the memory, the meter returns to
the measurement mode.
Logged data may be read only with the PC software provided with the meter.

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5 Characteristics of spectral sensitivity
Installed photodiodes with filters makes the spectral sensitivity characteristics well matched to
the requirements of C.I.E. (INTERNATIONAL COMMISSION ON ILLUMINATION). Sensitivity parame-
ters V (λ) are presented on the following charts.
LXP-10A
Charakterystyka korekcji widmowej V(λ)
0,00000
0,10000
0,20000
0,30000
0,40000
0,50000
0,60000
0,70000
0,80000
0,90000
1,00000
380 430 480 530 580 630 680 730 780
Długość fali w nm
Czułość względna
V(λ)_wzorca
V(λ)_LXP-10A
LXP-10B
Charakterystyka korekcji widmowej V(λ)
0,00000
0,10000
0,20000
0,30000
0,40000
0,50000
0,60000
0,70000
0,80000
0,90000
1,00000
380 430 480 530 580 630 680 730 780
Długość fali w nm
Czułość względna
V(λ)_wzorca
V(λ)_LXP-10B
Fig. 1 Characteristics of spectral sensitivity
6 Recommended lighting
LOCATION
lx
fc
OFFICE
Conference room, reception
200~750
18~70
Office work
700~1,500
65~140
Typing, designing
1,000~2,000
93~186
FACTORY
Visual works on the production line
300~750
28~70
Inspection works
750~1,500
70~140
Electronic components, assembly line
1,500~3,000
140~279
Packaging, corridors
150~300
14~28
LP-1
Features of spectral correction V(λ)
LP-10A
Features of spectral correction V(λ)
LP-10B
Features of spectral correction V(λ)
LUXOMETER
WAVELENGTH [nm]
Relative sensitivity
Relative sensitivity
WAVELENGTH [nm]
Reference
Reference

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HOTEL
Public rooms, cloakroom
100~200
9~18
Reception
200~500
18~47
Cash register
750~1,000
70~93
SHOP
Interiors, stairs, corridors
150~200
14~18
Display window, packing table
750~1,500
70~140
The front side of a display window
1,500~3,000
140~279
HOSPITAL
Patient room, store
100~200
9~18
Room for medical examination
300~750
28~70
Operating theatre, emergency cases
750~1,500
70~140
SCHOOL
Assembly hall, interiors, gym
100~300
9~28
Classrooms
200~750
18~70
Laboratory, library, labs
500~1,500
47~140
1fc=10,76lx
7 Connection
Turn on the meter,
activate USB mod (see section 4.5) or radio transmission mode (see section 4.6),
start "FOTON" software to operate the meter.
Note: switch OFF the light meter before connecting USB cable to the meter socket.
8 Replacing the battery
Note:
While performing the measurements with the battery symbol displayed, the user must be
aware of additional measurement uncertainties or unstable operation of the device.
If the battery power is not sufficient to perform the measurements, the display will show the dis-
charged battery symbol, indicating the need to replace the battery with a new one.
After the meter is turned OFF, open the battery compartment cover.
Remove the old battery from the device and replace it with a standard 9V battery, then re-attach
the cover.
9 Cleaning and maintenance
1. White plastic disc on top of the detector should be cleaned with a damp cloth (if necessary).
2. Do not store the device in conditions of excessive heat or humidity.
Calibration interval for the photodetector will vary depending on the operating conditions, but in
general, its sensitivity is reduced in direct proportion to the product of light intensity and operating time.
In order to maintain the basic accuracy of the meter, we recommend periodic calibration (see section
16).
10 Storage
During the storage of the device, the following recommendations must be observed:
disconnect the probe from the meter
make sure that the meter and accessories are dry,
when the device is to be stored for longer time, remove the batteries

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11 Dismantling and Disposal
Worn-out electric and electronic equipment should be gathered selectively, i.e. it must not be
placed with waste of another kind.
Worn-out electronic equipment should be sent to a collection point in accordance with the law of
waste electrical and electronic equipment.
Before the equipment is sent to a collection point, do not dismantle any elements.
Observe local regulations concerning disposal of packages, waste batteries and accumulators.
12 Technical specifications
LP-1
Range
of display [lx]
Resolution [lx]
Spectral un-
certainty
Basic uncer-
tainty
0 ... 399.9
0.1
f1 ≤ 6 %
±(5 %+5 di-
gits)
400…3999
1
4.00 k…39.99 k
0.01 k
40.0 k…399.9 k
0.1 k
Range
of display [fc]
Resolution [fc]
Spectral un-
certainty
Basic uncer-
tainty
0 ... 39.99
0.01
f1 ≤ 6 %
±(5 %+5 di-
gits)
40.0 ... 399.9
0.1
400…3999
1
4.00 k…39.99 k
0.01 k
displaying the result in lx or fc
Class B of the meter
LP-10B
Range
of display [lx]
Resolution [lx]
Spectral un-
certainty
Basic uncer-
tainty
0 ... 39.99
0.01
f1 ≤ 6 %
±(5 %+5 di-
gits)
40.0 ... 399.9
0.1
400…3999
1
4.00 k…39.99 k
0.01 k
40.0 k…399.9 k
0.1 k
Range
of display [fc]
Resolution [fc]
Spectral un-
certainty
Basic uncer-
tainty
0…3.999
0.001
f1 ≤ 6 %
±(5 %+5 di-
gits)
4.00 ... 39.99
0.01
40.0 ... 399.9
0.1
400…3999
1
4 k…39.99 k
0.01 k
displaying the result in lx or fc
Class B of the meter
LP-10A
Range
of display [lx]
Resolution
[lx]
Spectral
uncertainty
Basic uncer-
tainty
0…3.999
0.001
f1 ≤ 2 %
±(2 %+5 di-
gits)
4.00 ... 39.99
0.01
40.0 ... 399.9
0.1
400…3999
1
4.00 k…39.99 k
0.01 k
40.0 k…399.9 k
0.1 k

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Range
of display [fc]
Resolution
[fc]
Spectral
uncertainty
Basic uncer-
tainty
0…3.999
0.001
f1 ≤ 2 %
±(2 %+5 di-
gits)
4.00 ... 39.99
0.01
40.0 ... 399.9
0.1
400…3999
1
4.00 k…39.99 k
0.01 k
displaying the result in lx or fc (displaying fc result with reduced resolution due to the display
limitations)
Class A of the meter
Note: 1 fc=10.76 lx; 1 klx=1000 lx; 1 kfc=1000 fc
Other technical data
a) display...................................................................3-3/4" digital LCD with 40-segment bar-graph
b) exceeding the range................................................................................................."OL" symbol
c) Spectral sensitivity........................................ CIE spectral sensitivity (CIE human eye sensitivity)
d) cosine correction (f2’) .......................................................................................................... ±3 %
e) sampling rate.........................................................................................................1.3 times / sec
f) photodetector ................................................one silicon photodiode and spectral sensitivity filter
g) memory.................................................99 results (LXP-2), 999 results (LXP-10B and LXP-10A)
h) recorder memory.................................................................................................... 16000 results
i) working temperature..................................................................................................0 °C...50 °C
j) operational relative humidity ...................................................................................... 0 %...80 %
k) storage temperature ...............................................................................................-20 °C...70 °C
l) relative humidity.......................................................................................................... 0 %...70 %
m) power source.................................................................9V battery or 8.4 V rechargeable battery
n) length of the measuring probe.............................................................................approx. 150 cm
o) dimensions of the measuring probe................................................... 115 mm × 60 mm × 20 mm
p) dimensions of the control panel ......................................................... 170 mm × 80 mm × 40 mm
q) weight..................................................................................................................................390 g
r) interface ......................................................USB and wireless link (only LXP-10B and LXP-10A)
13 Standard equipment
The standard set of equipment supplied by the manufacturer includes:
control panel for LXP-2 or LXP-10,
9V battery,
measuring probe LP-1, LP-10B or LP-10A,
Note: LP-1 probe is not compatible with LXP-10A(B) panel
USB cable,
CD with software for reading the results,
operating manual,
guarantee card,
hard case.
14 Optional accessories
Additionally, the following items that are not included in the scope of standard equipment can be
purchased from the manufacturer or the distributors:
software for generating measurement reports - Foton 12464,
receiver for wireless (radio) transmission OR-1 (only LXP-10A/B).

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15 Service
The provider of guarantee and post-guarantee services is:
SONEL S.A.
ul. Wokulskiego 11
58-100 Świdnica
Poland
tel. [phone]
fax [phone]
E-mail: ex[email protected]
Web page: www.sonel.pl
Note:
Service repairs must be performed solely by SONEL S.A.
Made in UE.
16 Laboratory services
Measurement Laboratory of SONEL SA offers tests and certification of the following instru-
ments in the scope of their electrical/non-electrical features:
- infra-red cameras,
- pyrometers,
- meters for conducting the following electrical protective measurements: insulation resistance,
earth resistance and impedance, short-circuit loops, RCD parameters and multi-functional me-
ters that perform the above functions,
- electrical safety meters,
- power quality analysers,
- meters for measuring low resistance values,
- voltage meters, current meters (including clamp meters), resistance meters and multimeters,
- light meters.
A calibration certificate is a document confirming compliance of parameters declared by the
manufacturer of tested device with national standards, specifying the measurement uncertainty
In accordance with ISO 10012-1, Annex A –"Requirements for assuring quality of measure-
ment equipment. The system for approving metrological measuring equipment" –SONEL S.A. rec-
ommends for its instruments to be periodically tested, observing  13-month intervals.
For new devices with calibration certificates, the next metrological inspection (calibration) is
recommended within 13 months from the date of purchase, but not later than 19 months from the
date of manufacture.