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LightWatcher - Manual
Personal Data Logger - Manual
Version 3.10
April 2014
Wolf Technologieberatung - Object-Tracker
Elisabethstrasse 4
A-2380 Perchtoldsdorf, Austria
Email: [email protected]
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LightWatcher - Declaration of Conformity
Wolf Technologieberatung declares that the LightWatcher / Personal Data Logger complies with
the essential safety & health requirements and provisions of EC Council Directives 93/42/EEC,
Annex I and VII for Class I Medical Devices.
Manufacturer:
Wolf Technologieberatung - Object Tracker
Elisabethstrasse 4
2380 Perchtoldsdorf
Austria
Applicable Standards:
EN60601-1:2001 Medical electrical equipment – General requirements for safety.
EN60601-1-2:2002 Medical electrical equipment – Part 1-2: General requirements for safety –
Collateral standard: Electromagnetic compatibility – Requirements and tests.
Group 1 equipment / Class B – (emissions only)
EN60601-1-2:2002 Medical electrical equipment – Part 1-2: General requirements for safety –
Collateral standard: Electromagnetic compatibility – Requirements and tests.
Non life supporting equipment (immunity section only)
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Table of Contents
1
2
3
4
5
6
7
8
9
Quick start ........................................................................................................................... 6
Device Description .............................................................................................................. 7
Accessories......................................................................................................................... 9
3.1
Eyeglass mount............................................................................................................ 9
3.2
Headset mount............................................................................................................. 9
3.3
Badge magnetic mount............................................................................................... 10
3.4
Necklace mount.......................................................................................................... 10
Potential Hazards .............................................................................................................. 11
4.1
Lithium Polymer Battery ............................................................................................. 11
4.1.1
Potential hazards of the Li-Polymer battery ......................................................... 11
4.1.2
Technical data of the Li-Polymer battery ............................................................. 11
4.1.3
Charging the battery............................................................................................ 11
4.2
Ground current through USB port............................................................................... 12
4.3
Materials .................................................................................................................... 12
Cleaning and Disinfection.................................................................................................. 13
5.1
Desinfektionsplan ....................................................................................................... 13
OT Sensor Software - Installation ...................................................................................... 15
6.1
Description ................................................................................................................. 15
6.2
Communication between OT Sensor program and Data Logger via USB................... 16
6.3
Software Installation ................................................................................................... 17
6.4
Installing the Device Driver in Windows XP ................................................................ 17
6.5
Installing the Device Driver in Windows 7................................................................... 20
6.6
Verifying successful installation of the Device Driver .................................................. 22
6.7
Un-installing the Device Driver ................................................................................... 23
6.8
Disable check of code signing for Device Drivers ....................................................... 24
OT Sensor program - Operation ........................................................................................ 26
7.1
Starting the program................................................................................................... 26
7.2
Device Configuration .................................................................................................. 28
7.3
Program Settings........................................................................................................ 32
7.4
Data Display............................................................................................................... 34
7.5
Data Editing................................................................................................................ 35
7.6
Saving Charts............................................................................................................. 35
7.7
Calibration 1 ............................................................................................................... 35
7.8
Calibration 2 ............................................................................................................... 36
7.9
Extras......................................................................................................................... 37
7.10
Menu commands .................................................................................................... 38
7.11
Report..................................................................................................................... 40
7.12
Known issues, recommendations............................................................................ 43
Photodiodes ...................................................................................................................... 44
8.1
Agilent HDSL-5400 IR detector .................................................................................. 44
8.2
Hamamatsu S7686 photodiode visible spectrum ........................................................ 45
8.3
Hamamatsu S9032-2 Color Sensor ............................................................................ 45
8.4
Roithner GUVA-S10GD UV detector .......................................................................... 46
8.5
Roithner GUVB-S10GD UV detector (option) ............................................................. 46
8.6
Roithner GUVA-S20ED UV detector........................................................................... 47
8.7
Spectral sensitivity tables ........................................................................................... 48
8.8
Physical interpretation of measurements.................................................................... 50
Appendix ........................................................................................................................... 52
9.1
Communication Protocol ............................................................................................ 52
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9.2
Data Record Formats ................................................................................................. 53
9.2.1
Data Record A 'Acceleration': header = 23, size = 64 bytes............................. 53
9.2.2
Data Record B 'All Variables': header = 21, size = 64 bytes ............................ 55
9.2.3
Data Record 'System Event': header = 10, size = 64 bytes ............................. 57
9.3
Status bits ( firmware version 1.x, obsolete) .............................................................. 58
9.4
Status bits ( firmware version 2.x )............................................................................. 58
9.5
Configuration bits ( firmware version 2.x ).................................................................. 59
1 Quick start
•
•
•
•
•
•
Install the software program 'OT Sensor' on a PC, preferably equipped with an English
language version of Windows-XP SP-3, Windows 7, or higher.
Connect the data logger to the USB port, and install the driver.
Start the OT Sensor program, connect to the data logger, and configure the data logger.
Optionally perform a dark calibration.
Erase the data logger memory.
Leave the data logger connected for approx. 1.5 hours to fully charge the battery.
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2 Device Description
The 'LightWatcher' data logger is a miniaturized portable data acquisition system that
measures and records a unique combination of 10 environmental variables that are important in
the study of human performance, of biological rhythms, and of the effect of the environment on
biological systems.
Figure 1: Data logger with housing
This small device measures and records light irradiance in 5 spectral bands (UV, Red, Green,
Blue, IR), acceleration in 3 axis (actimeter) and temperature. The measurement of illuminance
(Lux), barometric pressure and relative humidity are available as an option.
Nr
Variable
Range
Res.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
IR Light Irr. 860 nm
Red Light Irr. 620 nm
Green Light Irr. 540 nm
Blue Light Irr. 460 nm
UV Light Irr. 350 nm
Barometric pressure
Temperature
Rel. Humidity
Acceleration X
Acceleration Y
Acceleration Z
Battery Voltage
System Voltage
Data and Time
Button Status
0.01 to 2000
0.01 to 2000
0.01 to 2000
0.01 to 2000
0.1 to 2000
0.0 to 1500
-50 to +80
5 to 98
-5.0 to +5.0
-5.0 to +5.0
-5.0 to +5.0
0.0 to 5.0
0.0 to 5.0
On/Off
10
-3
10
-3
10
-3
10
-3
10
0.1
0.1
0.3
0.002
0.002
0.002
-2
10
-3
10
-3
10
-
-3
Unit
2
mW/m .nm
2
mW/m .nm
2
mW/m .nm
2
mW/m .nm
2
mW/m .nm
hPa
deg C
%
g
g
g
V
V
sec
-
The optical axis of the data logger points in longitudinal direction. An opaque window from
PTFE protects the photo sensors. The data logger measures 20 x 10 x 50 mm and has a weight
of 12 grams.
The data logger is powered by a rechargeable Lithium Polymer battery, which is charged via the
USB bus. One battery charge enables a stand-by time of up to 3 months and an operational
time of days to weeks, depending on the selected recording rate.
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The sampling and recording rate can be set to a value from 0.5 seconds to 30 minutes. A fast
recording rate is available for the acceleration variables. Data are stored in Flash memory.
Storage capacity is sufficient to record 1 data record per second for 18 hours, of 1 data record
per minute for 6 weeks. Recording is toggled on / off with a single push button (push for 2
seconds). This push button serves also as an event marker if pushed for 0.5 seconds. A small
LED and a sounder provide feedback to the user. A real time clock keeps date and time with an
accuracy of approx. +- 10 second/day.
The device has a USB-2 data interface. Via this interface and a dedicated software program
(OT-Sensor), the device can be configured for the particular monitoring task, and recorded data
can be downloaded to the PC for display, analysis and archiving.
The data logger is in-circuit programmable; firmware updates can be programmed into the fully
assembled device.
Technical specifications:
Variable
Description
Size
Mass
Power
Battery
Charge time
Data memory
Recording cap.
Recording rate
20 mm x 50 mm x 10 mm
12 grams
Battery or via USB bus, 100 mA max.
Li-Polymer battery, 3.7 V, 100mAh
1.5 hours
4 MByte Flash
64,000 data records
2 samples / sec. to 1 sample / 60 min.
32 samples / sec. for acceleration
USB-2
~ 10 minutes for 64,000 data records
Irradiance: IR,R,G,B,UV
Acceleration, 3-axis: -5.0 to +5.0 g
Temperature: -50 to +80 deg C
Barometric Pressure: 0 - 1500 hPa
Relative Humidity: 10 to 98 % (optional)
+- 10 ppm, +- 10 second/day
~ 3 month
1) Eyeglasses
2) Headset, to be worn on head
3) Badge, to be worn on working coat
4) Necklace
Data interface
Download time
Variables
Real time clock
Stand-by time
Anatomical mounts
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3 Accessories
Four types of anatomical mounts are currently available for studies with human subjects:
3.1
Eyeglass mount
The Eyeglass anatomical mount is based on eyeglasses with zero diopter plastic glasses
(several models available). The data logger is attached to one of the sidebars with double-sided
adhesive tape. This mount keeps the optical axis of the data logger well aligned with the
principal viewing direction of the subject.
Figure 3: Data logger mounted to Eyeglass
3.2
Headset mount
The Headset anatomical mount is a light-weight mounting platform for the data logger and
optional auxiliary devices. The headset is manufactured from stainless steel, has foam rubber
padded temporal cushions, and a low weight of 25 grams. The headset guarantees comfort
even if worn all day long. It provides good fixation of the data logger relative to the head during
typical office work and low to medium impact physical activity, and keeps the optical axis of the
data logger well aligned with the principal viewing direction of the subject.
Figure 4: Data logger mounted to Headset
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Badge magnetic mount
The Badge magnetic mount provides an easy, comfortable way to wear the data logger like a
badge on a shirt or on a working coat. The optical axis of the data logger will point primarily
upwards in vertical direction.
Figure 5: Data logger with badge magnetic mount
3.4
Necklace mount
The Necklace mount provides an easy, comfortable way to wear the data logger like a
necklace. The optical axis of the data logger will point primarily in vertical direction.
Figure 6: Data logger with Necklace
The data logger is supplied in a plastic transport box together with useful accessories such as a
dark calibrator, a wall charger, and a USB cable.
Figure 7: Subjects wearing a data logger attached to eyeglass (left), headset (center),
neckband (bottom), and armband (bottom). Transport box with accessories (bottom)
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4 Potential Hazards
4.1
Lithium Polymer Battery
The data loggers are fitted with a small lithium polymer battery, which enables autonomous
operation of the device without connection to an external power supply. Please read the
following instructions before using the battery. Improper use of the battery may cause heat,
damage, or capacity deterioration of the battery:
4.1.1 Potential hazards of the Li-Polymer battery
Do not dip or wet the battery in water, seawater, or other liquid. If the housing of the battery is
damaged, the battery may discharge with abnormal current, which may result in the generation
of heat or fire of the battery.
The battery has a defined polarity and must be connected in the right way to the charger. If the
battery is connected in reverse polarity to the charger, it is charged reversely which may cause
acid leakage, heat generation, or fire.
Do not let the battery terminals (+ and -) connect to any metal or conductive material. The
battery may be shortened accidentally which may result in excessive discharge current, heat
generation, or fire.
Do not impose any mechanical impact on the battery.
If the battery leaks and its electrolyte contacts with skin, eyes, or clothes, rinse immediately with
fresh water, and consult a doctor.
4.1.2 Technical data of the Li-Polymer battery
Variable
Description
Capacity
Charging current
Charging voltage
Discharge cut-off voltage
Temperature, charge
Temperature, discharge
100 mAh
50 mA max.
4.20 V +- 0.05 V
2.75 V
0 to +45 deg.C
-20 to +60 deg.C
4.1.3 Charging the battery
Charge the battery by connecting the USB port of the data logger to a PC. The battery will
charge with a current of max. 100 mA. A full charge should be achieved in 1.5 hours. The
battery is protected against over-charging.
If charging the disconnected battery with a laboratory power supply, limit the charging voltage
accurately (!) to 4.20 V, and limit the charging current to 50 mA.
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If the data logger is not in use, charge the battery every 3 month.
4.2
Ground current through USB port
The data logger is equipped with a USB port that is used to communicate with a PC and to
charge the Li-Polymer battery.
The device must not be worn while it is connected to the USB port of a PC (while the PC
is connected to mains). This is to prevent excessive ground currents, which might occur when
the PC is not equipped with certified galvanic isolation. Desktop PCs typically do not provide
galvanically isolated power supplies.
4.3
Materials
All exposed surfaces of the data logger and accessories are manufactured from materials that
are inert and resistant against a variety of commonly used cleaning and disinfecting agents. The
following materials are used:
Housing:
Optical aperture:
Back surface:
Headset:
Glasses:
Polished aluminum,
PTFE, stainless steel
Silicone rubber, Micro-USB connector
Stainless steel, poly-amid cushion
Acetal, polycarbonate
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5 Cleaning and Disinfection
5.1
Desinfektionsplan
Es wird empfohlen, die Oberflächen des Daten-Loggers und des Zubehörs unter
Berücksichtigung der jeweiligen Anwendung des Gerätes / Zubehörs und der Anforderungen
des Anwenders regelmäßig mit einem der genannten Desinfektionsmittel zu behandeln.
Die Häufigkeit der Desinfektion kann den Anforderungen des Anwenders angepasst werden.
Gegenstand
Daten-Logger
Häufigkeit
Nach jedem Träger,
nach Kontamination.
Methode
Wischdesinfektion des
Gehäuses.
Nach Kontamination.
Wischdesinfektion des
Bügels und der Polster.
Nach jedem Träger,
nach starker
Kontamination.
1. Polster vom Bügel
abtrennen und entsorgen.
2. Wischdesinfektion des
Bügels.
3. Danach neue Polster
(selbstklebend) auflegen.
Halsband
Nach jedem Träger,
nach Kontamination.
1. Halsschnur aus den
Ösen der Montageplatte
ziehen und entsorgen.
2. Wischdesinfektion der
Montageplatte.
3. Neue Halsschnur
befestigen.
Brosche
Nach jedem Träger,
nach Kontamination.
Wischdesinfektion der
Montageplatte und des
Magnet-Gegenstücks.
Brille
Nach jedem Träger,
nach Kontamination.
Wischdesinfektion des
Brillenrahmens und der
Brillengläser.
Headset
Desinfektionsmittel
Mikrozid AF Liquid ™
EWZ : 1 min
Antiseptica Kombi ™
0.5 % - EWZ: 15 min
Antiseptica Kombi ™
Liquid / Spray
EWZ: 15 min
Acrylan ™
unverdünnt
EWZ: 5 min
Acryl-Des ™
Gebrauchslösung
EWZ: 1 min
USB Kabel,
Ladegerät
Nach Gebrauch
Wischdesinfektion
Mikrozid AF Liquid ™
EWZ : 1 min
Transportbox
Nach Gebrauch
Wischdesinfektion
Antiseptica Kombi ™
0.5 % - EWZ: 15 min
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Bemerkungen:
Alle Oberflächen des Daten-Loggers und des Zubehörs sind beständig gegen die in der Tabelle
genannten Desinfektionsmittel. In einem Test wurden die Oberflächen 100 Stunden lang in die
genannten Desinfektionsmittel eingelegt. Nach einer Behandlungsdauer von 100 Stunden
konnten keine sichtbaren Veränderungen oder Funktionseinschränkungen der Oberflächen der
verwendeten Materialien festgestellt werden.
Der Daten-Logger ist an den Tragevorrichtungen (Headset, Brille, Halsband, oder Brosche) mit
doppelseitigem elastischen Klebeband befestigt. Bei Bedarf, z.B. zur Erneuerung oder zum
Austausch der Tragevorrichtung, kann der Daten-Logger von diesem Klebeband durch kräftiges
aber langsames Ziehen am Klebeband abgetrennt werden. Die neuerliche Befestigung des
Daten-Loggers an der Tragevorrichtung erfolgt mit doppelseitigem elastischen Klebeband.
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6 OT Sensor Software - Installation
6.1
Description
OT Sensor is a software program running under Microsoft Windows-XP SP3 or Microsoft
Windows 7. This program provides a variety of useful functions that are necessary to work with
the data logger, i.e., device configuration, real time data acquisition, data download, data
display, data storage, data retrieval, and the creation of reports. Prior to use, the program must
be activated with a license key.
Figure 8: Screen shot of OT Sensor program
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Communication between OT Sensor program and Data Logger via USB
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Software Installation
To install the OT Sensor program:
1. Back up previously recorded data (C:\....\My Documents\OT Data).
2. Un-install the old version of OT Sensor.
3. Unzip and install the new version by running 'OT_Sensor_Setup.exe'
6.4
Installing the Device Driver in Windows XP
After installation of the OT Sensor program, the driver for the data logger must be installed. This
driver emulates a serial communication port via the USB hardware interface.
The installation process uses the Windows modem driver 'usbser.sys', typically located in
directory 'C:\windows\system32\drivers\', typical file version 5.1.2600.2180. During installation,
this modem driver is configured with settings supplied by Object-Tracker in file
'OT_Sensor_cdc_x.inf'.
Note: Driver installation requires the English language Version of Windows-XP, SP-2 or
higher, or Windows-7 !!!
Driver installation on non-English language versions of Windows-XP may not be successful.
Proceed as follows:
--> Connect the data logger to the PC via USB.
--> Windows will pop-up a small 'Found New Hardware' window
--> Windows will pop-up a 'Found New Hardware Wizard' window
--> Select 'No, not this time' and click 'Next'
--> Windows will pop-up another 'Found New Hardware' window
--> Select 'Install from a list or specific location (Advanced)' and click 'Next'
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--> Windows will ask for location of driver .INF file
--> Select 'Search for the best drivers in these locations', specify the directory into which 'OT
Sensor' has been installed (C:\Program Files\OT_Sensor\), and click 'Next'.
--> Windows will display a dialog box that informs about the progress of installation.
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--> Windows may ask for the location of additional files that are required for driver installation.
These files are typically located in directory 'c:\windows\system32\drivers'
--> Select the appropriate directory and click OK
--> Windows will display a warning
--> Click 'Continue Anyway'
--> Windows informs that the driver has been installed
--> Click 'Finish'
--> The driver has been installed
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Installing the Device Driver in Windows 7
After installation of the OT Sensor program, the driver for the data logger must be installed. This
driver emulates a serial communication port via the USB hardware interface.
The installation process uses the Windows modem driver 'usbser.sys', typically located in
directory 'C:\windows\system32\drivers\', typical file version 5.1.2600.2180. During installation,
this modem driver is configured with settings supplied by Object-Tracker in file
'OT_Sensor_cdc_x.inf'.
Driver installation on non-English language versions of Windows-XP may not be successful.
Proceed as follows:
--> Connect the Data Logger
--> Windows will not recognize the Data Logger.
--> Open the ‘Device manager’, locate item 'Other devices'. You will notice sub-item 'OT Sensor'
with a small exclamation mark.
--> Double click on item 'OT Sensor'
--> Properties window will pop up
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--> Click Update Driver
--> Click ‘Browse my computer for driver software’
--> Select 'Search for driver software in this location', specify the directory into which 'OT
Sensor' has been installed (C:\Program Files\OT_Sensor\), and click 'Next'.
--> Windows will display a warning
--> Select 'Install this driver software anyway’
--> The driver has been installed.
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Verifying successful installation of the Device Driver
Upon successful installation, the Data Logger is now visible as device in the Windows Device
Manager in category 'Ports (COM & LPT)'.
Select: Start --> Settings --> Control Panel --> System --> Hardware --> Device Manager
Before connection of Data Logger
After connection of Data Logger
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Un-installing the Device Driver
--> Select System Properties: Click Start --> Settings --> Control Panel --> System
--> A dialog box will be displayed
--> Select the Device Manager: Click Hardware --> Device Manager
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--> Double click item 'Ports --> Emulated Communication Port'
--> A dialog box will open
--> Select tabsheet 'Driver'
--> Click button 'Uninstall'
--> A dialog box will be displayed, asking for confirmation of device driver un-installation.
--> Click OK
--> The driver will be un-installed
--> Disconnect the Data Logger from the PC
6.8
Disable check of code signing for Device Drivers
1. Auf „Start“ klicken (das kleine Windows Symbol links unten in der Taskleiste).
2. Im Suchfeld „gpedit.msc“ eingeben und Enter drücken. Die Lokalen Gruppenrichtlinien
werden geöffnet.
3. Nun „Benutzerkonfiguration“ auswählen.
4. Administrative Vorlagen“ anklicken.
5. System“ anklicken
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6. Treiberinstallation“ auswählen.
7. Codesignatur für Gerätetreiber“ mit der rechten Maustaste anklicken und „Eigenschaften“
wählen.
8. Bei „Einstellung“ das Häkchen von „Nicht konfiguriert“ auf „Aktiviert“ setzen.
9. Ein wenig tiefer bei „Beim Ermitteln einer Treiberdatei ohne Digitalsignatur“ auf „Ignorieren“
stellen.
10. Übernehmen“ und „OK“ anklicken.
11. Den PC neu starten (alternativ im Suchfeld „gpupdate“ eingeben).
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7 OT Sensor program - Operation
7.1
Starting the program
- Start OT_Sensor.exe.
--> The program will scan communication ports COM1 to COM16 for attached devices.
- Select the communication port to which the data logger is connected (COM3, COM4...).
- Click button 'Connect'
--> If the data logger real time clock is not properly synchronized with the PC clock (time
difference +- 2 seconds or larger), the following dialog box will be displayed.
- Click 'Yes' if you decide to synchronize the clocks.
--> If no or invalid calibration parameters are stored in the data logger, a dialog box will be
displayed that alerts the user that default calibration parameters will be loaded.
- Click 'OK'
Note: Calibration parameters are stored in the data logger's flash memory. The calibration
parameters are used for data display purposes only. Data are always recorded as raw binary
values in the data logger memory and in the PC data buffer. This has the advantage that
calibration parameters can be corrected at a later time if required.
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--> The data logger plug-in will be opened
The data logger applet has 6 pages (Device Configuration, Program Settings, Data, Calibration
1, Calibration 2, and Spectra), which will be described in the following chapters.
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Device Configuration
- Select page ' Device Configuration' to configure the data logger. All device settings will be
stored in data logger flash memory and will be remembered even if the data logger is not
powered.
Panel Device Info, Date and Time:
Device Name: Displays a name string (16 characters max), can be set by entering a new
name and pressing the 'Set' button.
Device Serial No.: Displays the serial number of the connected device.
Device Type: Displays the type of the connected device.
Device Firmware: Displays the embedded software version of the connected device.
Device Data and Device Time: Display data and time of the real time clock of the data logger.
Values are updated every second. Pressing the 'Set' button will synchronize the internal clock of
the data logger with the PC clock.
PC Data and PC Time: Display data and time of the PC clock.
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Sync Error: Displays an approximate value for the synchronization error between data logger
clock and the PC clock.
Query Device Status every Sec: Update page 'Configuration' with status information of the
data logger every second.
Panel LED:
Flash LED on Command: When selected, the small LED on the data logger will light up every
time the data logger receives a command.
Flash LED on Sampling Data: When selected, a small LED on the data logger will light up
when the data logger takes a measurement.
Flash LED on Recording Data: When selected, a small LED on the data logger will light up
when the data logger records data to flash memory.
Panel Button:
Sound Buzzer on Press Button 2 Secs: The data logger is equipped with a push button.
Pressing this button for a short period of < 2 seconds is referred to as Button1_Press event.
Pressing the button for 2 seconds or longer is referred to as Button2_Press event. Pressing the
button for 10 seconds or longer is referred to as Button3_Press event.
If the button is pressed for > 2 seconds and this option is enabled, the data logger will sound the
piezo-sounder with the following sounds:
Status
Sound
Power source is USB + recording enabled
Power source is USB + recording disabled
Power source is battery + recording enabled
Power source is battery + recording disabled
Short beep with high frequency
Short beep with low frequency
Chirp with increasing frequency
Chirp with decreasing frequency
Toggle Recording on Button 2 Secs: If the button is pressed for > 2 seconds and this option
is enabled, the recording function of the data logger will be toggled on/off.
Note: If the button is pressed for > 10 seconds, the device will restart. Recorded data will not
be affected. Restart may become necessary in case the device hangs up (sometimes caused by
communication errors between PC and device).
Panel Power Info:
Power Accelerometer: Displays the status of the power supply of the accelerometer. (green =
on, gray = off).
Power Photodiode OpAmp: Displays the status of the power supply of the photodiode
opamp. (green = on, gray = off).
Power Pressure Sensor: Displays the status of the power supply of the pressure sensor.
(green = on, gray = off).
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Power Humidity Sensor: Displays the status of the power supply of the humidity sensor.
(green = on, gray = off) (optional).
Pre-power: This option selects the amount of time (in 1/32 sec. units) that power will be
switched on before taking a measurement. Set this value between 2 and 4.
Power all sensors if Battery Power: This indicator informs the user about the power
management mode of the device (green = on, gray = off).
If this indicator is off, the power to all device sensors and amplifiers will be automatically
switched on shortly before taking a measurement. Power will automatically be switched off
again after the measurement to conserve battery power and to extend battery live.
If this indicator is on, power to all device sensors and amplifiers will be permanently turned on.
Power all sensors if USB Power: This indicator informs the user about the power
management mode of the device (green = on, gray = off).
If this indicator is on, power to all device sensors and amplifiers will be permanently turned on
as soon as the device is connected to USB.
Panel Sensors:
Light Sensor Gain: Specifies the amplification factor of the signals of specific light sensors.
(Data Logger v3.x: IR-, Red-, Green-, Blue-, UV-sensor).
(Data Logger v5.x: Lux-sensor).
It is recommended to set the amplification factor = 4.
Attention: After changing the amplification factor, it is necessary to perform a dark calibration !!!
A/D Acquisition Time: Specifies the acquisition time of the A/D converter that quantifies the
light sensor signals.
(Data Logger v3.x: IR-, Red-, Green-, Blue-, UV-sensor).
(Data Logger v5.x: Lux-sensor).
Longer acquisition times will reduce the signal noise.
It is recommended to set this value to 0011 (16ms).
Accelerometer Range: Selects the range of the accelerometer (-2g to 2g, or -5g to 5g).
Attention: After changing the range, it is necessary to calibrate the accelerometer !!!
Panel Recording:
Enable Recording: This option enables/disables recording to device data memory.
Sampling Interval A: Specifies the sampling interval for acceleration vectors. Eight
acceleration vectors will be packed in a data record of type A (header = 23) and recorded.
Note: Acceleration values typically change at a much higher rate than e.g., temperature or
barometric pressure. Sampling Interval A provides an option to combine the acquisition of
acceleration vectors at a high sampling rate with the acquisition of other variables at a lower
sampling rate.
Sampling Interval B: Specifies the sampling interval for the light intensities, temperature,
humidity, pressure, acceleration, etc. These variables will be packed into a data record of type B
(header = 21) and recorded.
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Accumulate B: If enabled, recording of data records type B will be performed at a lower rate
(specified by recording interval B) than sampling. Sampled values will be accumulated and
divided by the number of samples before recording, resulting in the recording of the average
sampled value.
Note: Recording_interval_B must be smaller than 256 * sampling_interval_B.
Recording Interval B: Specifies the recording interval for data records type B.
No. of Data Records: Displays the number of already recorded data records
Recording time left: Displays the time left until the device memory is full, assuming the
currently set recording rate.
Load Data from Device: This operation will download all data records from the data memory
of the data logger to the PC. This operation will typically take several minutes to complete.
Save Data to File: This operation will save all data records from the PC data buffer to the
specified file.
Erase Data from Device: This operation will erase the data flash memory of the data logger.
This operation takes approx. 40 seconds to complete.
Cancel: Clicking this button will cancel the download of data from the device.
Download + Safe + Erase: This operation will 1) download all data records from the data flash
memory of the data logger to the PC, the 2) save the downloaded data to a file, and 3) erase
the data flash memory of the data logger. This operation will typically take several minutes to
complete.
Panel Scheduler:
Enable Scheduler: This option enables/disables the scheduler. The scheduler will turn on
recording at the specified date and time.
Scheduler Data and Scheduler Time: Specify data and time at which the scheduler should
turn recording on / off.
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Program Settings
Select page 'Program Settings' to configure certain program options.
Extract RecA Data (Accel.): This option enables / disables the extraction of fast acceleration
data records from the recorded data.
Use Temperature Compensation: This option enables / disables temperature compensation
of the pressure sensor reading.
Set Low-Limit of Light Values to 0.00: When enabled, this option will set negative light values
to zero. Negative values may occur due to noise in the data acquisition chain.
Save data to text file: Data are regularly saved in binary format. When this option is enabled,
the user will be prompted if he also wants to save data in text format (in addition to binary
format).
Calibration File Version: Data Loggers manufactured from 2012 onwards use version 'v2'.
Decimal Separator: This option selects the decimal separator used for the OT-Sensor user
interface and in exported *.txt data files. This is useful when exporting data to English language
(point '.' separator) or German language (colon ',' separator) data processing utilities (e.g., MSExcel).
Default Data Directory: Displays the directory from / to which files (data, calibration, ...) will be
loaded / stored by default.
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Estimate Lux from RGB: This option enables / disables the estimation of Light_Lux values
from irradiance values measured with the Red-, Green-, and Blue- photodiodes.
Estimated values are only a rough approximation of values that are measured with a V-Lambda
corrected photodiode, which has a sensitivity function similar to the sensitivity function of the
human eye. However, estimated values can be useful if a V-Lambda corrected photodiode is
not installed in the device.
The following equation is used to estimate Lux from RGB:
Lux =~ wConst *(wRed *R + wGreen *G + wBlue *B),
where R,G,B are the irradiances in mW/m2/nm, and wConst is a scaling factor.
Report Settings: Provides options to configure the MS-Word Report.
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Data Display
Select page 'Data' to display data.
Sampling Interval: Selects the real time sampling interval.
Start/Stop: Starts/stops the real time data acquisition. Real time data acquisition is
independent from data recording on the device. During real time data acquisition, data are
requested from the PC program, measured by the device, returned to the PC, and stored in a
data buffer array on the PC. During data recording, data acquisition is triggered by the real-time
clock of the device and stored in device Flash memory.
Erase Data (PC): Erases the PC data buffer. Data stored in device memory will not be
affected.
Show real time data: If this option is selected, the chart will be updated with real time data.
Deselect this option to view historic data, such as data that have been downloaded from the
device.
Show raw data values: If selected, raw data values in hexadecimal format are displayed in
the data table.
Trigger measurements: If selected, a new measurement will be triggered after data have
been read from the device.
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Data Table: Displays the data. Click in the first column of the table to enable / disable
acquisition of a particular sensor reading. Select a row to show the chart associated with the
selected variable.
Data Chart: Displays a chart of the selected variable. The scale of the display can me
changed by clicking on the green triangles located at the x- and y-axis.
7.5
Data Editing
The OT Sensor program provides a basic utility for editing data. Press the left mouse button,
drag the mouse curser, and release the left mouse button to select a slice op data. A red area
will indicate the selection. Now press the right mouse button above the chart area to open a
pop-up menu. Select command 'Delete Selection' to delete the selected data.
7.6
Saving Charts
Press the right mouse button above the chart area to open a pop-up menu. Select command
'Copy Chart' to copy the displayed chart to the clipboard. Select command 'Save Chart As' to
save the chart in either .bmp. or .jpg format to a file.
7.7
Calibration 1
Select page 'Calibration 1' to enter calibration data manually or to perform a calibration for a
selected sensor. Make sure that real time data acquisition has been started.
Calibration Variable: Select the variable to calibrate.
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Sensor Reading: Displays the sensor reading in hexadecimal format.
True Value: Enter the true values of the variable being calibrated.
Add: Adds the data pair [Sensor Reading, True Value] to the list of calibration points.
Delete: Deletes the selected calibration point from the list of calibration points.
Calibrate: Perform a calibration for the selected variable.
Calibration 'linear' fits the linear function
y = a0 + a1*x to the calibration points.
Calibration 'linear_1' fits the linear function y = a0.a1 + a1*x to the calibration points.
Calibration 'log' fits the logarithmic function y = a0 + a1*exp(a2*x) to the calibration points.
7.8
Calibration 2
Select page 'Calibration 2' to perform calibration sequences of light sensors.
Regular users only perform the 'Dark Calibration'.
Dark Calibration:
1. Insert the device into the dark calibration utility (or place the device in a dark environment).
2. On page 'Data', turn on those light variables which you would like to calibrate.
3. Click button 'Dark Calibration ' to start the dark calibration sequence.
4. Calibration will take approx. 10 seconds, a beep indicates completion.
5. It is recommended to save the new calibration in the device memory.
Note: Dark calibration must be repeated after the amplification factor of the light sensors has
been changed.
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Extras
This page is visible only in special releases of the OT-Sensor Software.
Select page 'Test' to set certain critical variables of the data logger or to configure and test
certain key functions of the data logger.
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7.10 Menu commands
File --> Open Virtual Device: This command will open the plug-in of a virtual data logger.
After opening a virtual device, it is possible to open, view and edit data stored in a file.
Data --> Erase Data on PC: This command will erase the data buffer on the PC.
Data --> Erase Data in Device: This operation will erase the data flash memory of the data
logger. This operation takes approx. 30 seconds. This operation will temporarily suspend
recording and the watchdog timer.
Data --> Load Data from Device: This operation will download all data from the data logger to
the PC. The progress of the download operation is displayed in the status bar. This operation
may last several minutes.
Data --> Load Data from File: This operation will load data from the specified file to the PC
Data --> Save Data to File: This operation will save data from the PC to the specified file.
1) By default, raw data will be saved in binary format (*.dat). This saved file contains a
sequence of binary data records that is identical to the original data obtained from the device.
The format of the data records is described in chapter 'Data record formats'.
The program will then display a dialog box, asking the user if data should also be saved in 2
additional files in text format (raw data, and calibrated data).
2) If selected, the program will generate a file with raw data in text form (*_raw.txt). This text file
contain data as TAB (0x09) separated values, the first row contains the column labels. Rows
are separated by CR (0x13) LF (0x10) characters. The file format can be easily imported into
MS-Excel. Example:
Nr
Date Time Light_IR
Light_Red
Light_Green Light_Blue Light_UV
Pressure
System_Voltage
Temperature_1
Temperature_2
Rel.Humidity
Acceleration_X
Acceleration_Y
Acceleration_Z
Status_1
Status_2
1
2007-11-01
7501673
000000
08:42:09.750
7373483
7401053
7395517
000001
12996937
7172789
3524917
000000
000546
000473
000303
000000
000020
2
2007-11-01
7501673
000000
08:42:10.250
7373483
7401053
7395517
000001
12996937
7172789
3524917
000000
000544
000471
000306
000000
000020
3) If selected, the program will generate a file with calibrated data in text form (*_cal.txt). This
text file contain data as TAB (0x09) separated values, the first row contains the column labels.
Rows are separated by CR (0x13) LF (0x10) characters. The file format can be easily imported
into MS-Excel. Example:
Nr
Date Time Light_IR
Light_Red
Light_Green Light_Blue Light_UV
Pressure
System_Voltage
Temperature_1
Temperature_2
Rel.Humidity
Acceleration_X
Acceleration_Y
Acceleration_Z
Status_1
Status_2
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1
2007-11-01
93.693
0
20
08:42:09.750
0.000 1019.33
90.578
104.124
3.019 30.16 0.00 0.00
100.389
0.79 -0.31 2.95
2
2007-11-01
93.693
0
20
08:42:10.250
0.000 1019.33
90.578
104.124
3.019 30.16 0.00 0.00
100.389
0.76 -0.34 2.90
Data --> Load Calibration from Device: Loads all calibration parameters from the data
logger.
Data --> Load Calibration from File: Displays an 'Open File' dialog box, and loads all
calibration parameters from the specified file to the PC. The calibration parameters are not
saved to the device.
Data --> Save Calibration to Device: Saves all calibration parameters to the data logger.
Data --> Save Calibration to File: Saves all calibration parameters to a file in HTML format.
By default, this file will be located in sub-directory \data and will have the name
'DeviceSerialNo_yyyy-mm-dd_Calibration.htm'.
Data --> Make MS-Word Report: Generates a report in MS-Word format. This report provides
a nice summary of the recorded data. It includes statistics, charts, device configuration details,
and other useful information. The MS-Word report may be edited and adapted to the users
requirements. For details see chapter 'Report'.
Data --> Make Calibration Summary: Advanced feature. Generates a table that summarizes
the calibration parameters of all calibration files in a directory specified by the user. The result
file will be stored in the selected directory.
Data --> Analyze Data Batch: Advanced feature. Do not use.
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7.11 Report
The program can generate a report that can be configured by the user and will optionally
include statistics, charts, device configuration details, and other useful information of the
recorded data. The MS-Word report may be edited and adapted to the users requirements.
To initiate report creation, select menu command 'Data --> Make MS-Word Report'.
Report Template: Select the template to use for the report.
Select 'OT_Sensor_Template_DE.dot to generate a report in German language, or select
'OT_Sensor_Template_EN.dot to generate a report in English language.
Report Chapters: Select the chapters that you would like to have included in the report.
24-hr Charts: The program can generate 24-hr summary pages that gather 24-hr sections of
different data series (e.g., illuminance, temperature, pressure, activity) on one page. Select the
data series you want to include in the 24-hr pages.
24-hr Charts Range: Select for which days you want to create 24-hr summary pages. Enter
day numbers and/or day ranges sepparated by commas (e.g. 1,3,5-37).
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Charts: Select appropriate options for the charts to be included into your report.
Raster charts:
Select appropriate options for the raster charts to be included into your report
Save report as *.pdf: Select this option if you would like to save the report in MS-Word and in
.pdf format.
Show MS-Word document: Select this option if you want MS-Word to come into the
foreground after the report has been created.
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This page shows some pages of a report.
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7.12 Known issues, recommendations
•
The data logger is sometimes not recognized when trying to install the device driver on a PC
with a German language version of the Windows XP operating system. We recommend to
use the English language version of Windows XP, Service Pack 3.
•
The OT sensor program will disconnect from the device if any other USB device connected
to the PC is detached from the PC.
•
If the data logger (or the OT sensor program on the PC) hangs up and communication to the
data logger can not be re-established, we recommend to try any of the following:
- Disconnect the USB cable, wait 5 seconds, and re-connect the USB cable.
- Close and re-start the OT Sensor program.
- Reset the data logger (Press button for 10 seconds).
•
Device clock accuracy is approximately +- 10 seconds / day.
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8 Photodiodes
The data loggers v3.x integrate 5 photodiodes: one IR photodiode (Agilent HDSL-5400), one
color sensor (Hamamatsu S9032-2) that includes 3 photodiodes with filters, and one UV
photodiode (Roithner GUVA-S10GD). A PTFE window with a thickness of 1mm covers the
photo diodes.
The data loggers v5.x integrate 6 photodiodes: one photodiode for Lux measurement with a
spectral sensitivity analogous to CIE spectral luminous efficiency (Hamamatsu S7686), one
color sensor (Hamamatsu S11059-01WT) that includes photodiodes with filters in 4 wavelength
bands (IR, Red, Green, Blue), and one UV photodiode (Roithner GUVA-S20ED). A PTFE
window with a thickness of 1mm covers the photo diodes.
8.1
Agilent HDSL-5400 IR detector
Spectral photo sensitivity Sλ of Agilent HDSL-5400 IR detector
Photosensitive area:
Photo sensitivity at peak:
A = 0.15 mm2
Smax = 0.5 A.W -1 at 875 nm
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Hamamatsu S7686 photodiode visible spectrum
Spectral photo sensitivity Sλ of Hamamatsu S7686 photodiode
Photosensitive area:
Photo sensitivity at peak:
8.3
A = 6.72 mm2
Smax = 0.38 A.W -1 at 550 nm
Hamamatsu S9032-2 Color Sensor
Spectral photo sensitivity Sλ of Hamamatsu S9032-2 Color Sensor
Photosensitive area:
Photo sensitivity at peak:
A = 1.0 mm2 (for each detector)
Red: Smax = 0.16 A.W -1 at 620 nm
Green: Smax = 0.23 A.W -1 at 540 nm
Blue: Smax = 0.18 A.W -1 at 460 nm
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Roithner GUVA-S10GD UV-A detector
Spectral photo sensitivity Sλ of Roithner GUVA-S10GD UV detector
Photosensitive area:
Photo sensitivity at peak:
8.5
A = 0.076 mm2
Smax = 0.16 A.W -1 at 350 nm
Roithner GUVB-S10GD UV-B detector (option)
Spectral photo sensitivity Sλ of Roithner GUVB-S10GD UV detector
Photosensitive area:
Photo sensitivity at peak:
A = 0.076 mm2
Smax = 0.11 A.W -1 at 300 nm
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Roithner GUVA-S20ED UV-A detector
Spectral photo sensitivity Sλ of Roithner GUVA-S20ED UV detector
Photosensitive area:
Photo sensitivity at peak:
A = 0.076 mm2
Smax = 0.18 A.W -1 at 350 nm
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Spectral sensitivity tables
Photo Diode Photo Sensitivity
Area [m2]
GUVA-S20ED
UV
7.600E-08
S9032-02
Blue
1.000E-06
S9032-02
Green
1.000E-06
S9032-02
Red
1.000E-06
HDSL-5400
IR
1.500E-07
S2281
Reference
1.000E-04
nm
mA/W
mA/W
mA/W
mA/W
mA/W
mA/W
200
210
220
230
240
250
260
270
280
290
300
310
320
330
340
350
360
370
380
390
400
410
420
430
440
450
460
470
480
490
500
510
520
530
540
550
560
570
580
590
600
8.0
9.0
10.0
9.0
11.0
13.0
13.0
12.0
11.0
15.0
80.0
150.0
160.0
170.0
175.0
180.0
140.0
15.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.8
0.3
0.4
0.1
0.4
0.1
0.0
0.2
0.5
0.7
0.6
1.1
0.6
0.9
1.6
0.2
0.4
0.5
1.5
12.8
41.2
72.5
91.2
118.2
153.3
182.2
189.9
191.6
177.0
148.8
113.2
71.9
34.7
13.5
4.4
1.0
0.2
0.1
0.0
0.0
0.0
0.1
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.1
0.1
0.0
0.0
0.0
0.2
0.1
0.1
0.7
0.7
0.6
0.6
0.6
0.6
0.7
1.0
1.5
2.1
4.2
11.9
22.4
27.0
50.6
103.8
174.5
222.7
231.2
209.5
171.4
124.4
78.0
38.3
11.7
0.1
0.0
0.0
0.1
0.0
0.0
0.0
0.1
0.0
0.1
0.1
0.1
0.1
0.1
0.0
0.1
1.6
2.0
1.7
1.1
0.7
0.6
0.4
0.4
0.3
0.3
0.4
0.4
0.6
0.5
0.6
0.8
0.7
0.6
0.8
0.7
0.5
0.5
2.8
28.5
110.2
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
118.0
124.0
128.0
136.0
141.0
134.0
123.0
106.0
107.0
122.0
136.0
143.0
146.0
153.0
158.0
157.0
158.0
158.0
168.0
183.0
193.0
201.5
210.0
218.0
226.0
232.5
239.0
245.0
251.0
258.5
266.0
272.0
278.0
284.0
290.0
295.5
301.0
308.0
315.0
320.0
325.0
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610
620
630
640
650
660
670
680
690
700
710
720
730
740
750
760
770
780
790
800
810
820
830
840
850
860
870
880
890
900
910
920
930
940
950
960
970
980
990
1000
1010
1020
1030
1040
1050
1060
1070
1080
1090
1100
1110
1120
1130
1140
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.1
0.0
0.0
0.0
0.1
0.0
0.1
0.1
0.0
0.0
0.0
0.0
0.1
0.0
0.0
0.1
0.0
0.0
0.1
0.3
0.6
0.6
0.6
0.5
0.6
0.5
0.7
0.7
0.8
0.7
0.7
0.7
0.8
0.8
0.9
0.8
0.8
0.7
0.8
0.8
0.7
0.7
0.6
0.5
0.4
0.4
0.4
0.2
0.3
0.2
0.1
0.2
0.1
0.1
OT
2.3
0.6
0.3
0.1
0.1
0.1
0.1
0.2
0.3
0.5
0.5
0.4
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.5
0.5
0.6
0.6
0.6
0.6
0.6
0.6
0.7
0.7
0.7
0.7
0.7
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.7
0.7
0.6
0.5
0.5
0.4
0.4
0.3
0.3
0.3
0.2
0.2
0.2
0.1
158.3
157.1
131.9
107.8
85.4
63.5
46.6
34.3
24.6
17.2
12.2
8.8
6.4
4.7
3.4
2.5
2.0
1.6
1.3
1.1
0.9
0.9
0.8
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.8
0.8
0.8
0.8
0.8
0.9
0.8
0.8
0.8
0.8
0.7
0.7
0.6
0.6
0.5
0.4
0.4
0.4
0.3
0.3
0.2
0.2
0.1
0.1
Report
Version
Date
Page
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
5.0
15.0
30.0
55.0
90.0
160.0
230.0
290.0
345.0
390.0
420.0
450.0
467.5
480.0
490.0
495.0
500.0
495.0
490.0
485.0
475.0
460.0
445.0
425.0
405.0
380.0
360.0
330.0
305.0
280.0
250.0
225.0
200.0
175.0
150.0
135.0
115.0
100.0
85.0
75.0
60.0
50.0
40.0
32.5
25.0
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331.0
337.0
344.0
351.0
356.0
361.0
366.0
371.0
376.5
382.0
387.5
393.0
399.0
405.0
410.0
415.0
421.0
427.0
432.0
437.0
442.0
447.0
453.0
459.0
465.0
471.0
476.5
482.0
487.0
492.0
497.0
502.0
508.0
514.0
519.5
525.0
522.5
520.0
512.5
505.0
484.0
463.0
427.5
392.0
341.0
290.0
248.5
207.0
175.5
144.0
115.0
92.0
65.0
50.0
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1160
1170
1180
1190
1200
Sum
0.0
0.0
0.0
0.0
0.0
0.0
1181.0
0.1
0.0
0.1
0.0
0.0
0.0
1648.8
Report
Version
Date
Page
OT
0.1
0.1
0.0
0.0
0.0
0.0
1519.3
0.1
0.1
0.0
0.0
0.0
0.0
1050.6
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20.0
15.0
10.0
5.0
2.5
0.0
30.0
16.0
10.0
3.0
1.0
0.0
12017.5
29384.5
Table: Spectral sensitivity values of photodiodes. Grey values are extrapolated data points.
Figure: Spectral sensitivity function of photodiodes.
8.8
Physical interpretation of measurements
Light with a spectrum E(λ) [unit W/m2/nm] irradiates the optical aperture of the LightWatcher
data logger. The device measures this irradiant light in 5 spectral bands (IR, RED, GREEN,
BLUE, or UV) with 5 photodiodes (k = 1,2,3,4,5) equipped with optical filters. The photodiodes
have bell-shaped spectral sensitivity functions Sk(λ) with center frequencies at 860 nm (IR), 620
nm (Red), 540 nm (Green), 460 nm (Blue), and 350 nm (UV), and a spectral width (sensitivity
decay to 50% of sensitivity maximum) of 80 - 100 nm (see above table and figure).
The photo-current I k of photodiode k is in good approximation proportional to the incident
irradiance spectrum E(λ), folded with the sensitivity function Sk(λ) of this photodiode.
I k = c k .∫ E (λ ) • S k (λ ).dλ
Photo-currents I k thus represent the weighted integral value (sum) of the incident spectrum
E(λ) with the weighting function Sk(λ).
The output values E k of the device are linear functions of the photo-currents I k
E k = a 0, k + a1,k .I k
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Calibration values a0,k and a1,k are determined during device calibration. Calibration values a0,k
are close to zero. Calibration values a1,k normalize the areas S k (λ ).dλ of the photodiode
∫
sensitivity functions Sk(λ) and consider various factors that have an effect on the gain of the
signal chain.
The output irradiance values E k of the LightWatcher are provided in the unit W/m2/nm.
Irradiance values E k are normalized, band-pass-filtered values (spectral width 80 - 100 nm) of
the incident irradiance spectrum E(λ).
Hypothetically, if the LightWatcher would be irradiated with 'white' light with constant spectrum
(E(λ) = const. for all λ), the output irradiance values E k of the LightWatcher would be are all the
same and identical to E(λ).
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9 Appendix
9.1
Communication Protocol
The communication protocol between PC and data logger follows a simple request / response
mechanism. The PC program sends a single command byte 'Cmd', optionally followed by
between 0 and 64 additional data bytes. The data logger responds with between 1 and 64 data
bytes.
Cmd
Description
Additional
Data
(Bytes)
Response
(Bytes)
Comment
a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
Get_Acknowledge
Get_DeviceType
Get_DeviceSwVersion
Get_SerialNo
Set_SerialNo
Get_Name
Set_Name
Get_DateTime
Set_DateTime
Get_Config
Set_Config
Get_Status
0
0
0
1
8
8
Returned byte is '@'
0
8
0
16
0
6
8
1
16
1
6
1
0
26
0
26
1
4
p
q
r
s
t
u
v
Get_RecMax
Get_RecSize
Get_RecCount
Get_RecInterval
Set_RecInterval
Get_RecData
Set_RecData
0
0
0
0
4
4+1
4+1+N
4
2
4
4
1
N
1
w
x
EraseFlashSector
EraseFlashAll
4
0
1
1
C
D
Get_CalParameters
Set_CalParameters
2
1+1+N
64
1
R
Get_Record
0
N
S
Get_Record
0
N
Not used
Returned byte is '@'
Returned byte is '@'
Returned byte is '@'
Not used
Not used
Returned byte is '@'
SplIntv_A, SplIntv_B
Returned byte is '@'
N = 0 to 64
N = 0 to 64
Returned byte is '@'
Returned byte is '@'
Returned byte is '@'
N = 0 to 64
Returned byte is '@'
Perform a measurement, and
return data record.
N = RecSize (64)
Return the last data record, and
trigger a new measurement.
N = RecSize (64)
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Data Record Formats
9.2.1 Data Record A 'Acceleration': header = 23, size = 64 bytes
This data record contains 8 acceleration vectors, which supports the recording of acceleration
data at a higher rate.
Records of this type are recorded continuously to data logger memory if 1.) recording is enabled
and 2.) Sampling Interval A contains a valid value.
Name
# Bytes
Format Comment
Header
Date
2
2
word
word
Time in ms
4
dword
Interval
4
dword
= 23 (=0x17)
The number of days that have passed since 12/30/1899
Example: 1/1/2000 ... Date = 35069
Time of day of first sample in multiples of 1/1024
second
Interval between samples in multiples of 1/1024 second
Acceleration_X_1 2
Acceleration_Y_1 2
Acceleration_Z_1 2
word
word
word
1st sample
Acceleration_X_2 2
Acceleration_Y_2 2
Acceleration_Z_2 2
word
word
word
2nd sample
Acceleration_X_3 2
Acceleration_Y_3 2
Acceleration_Z_3 2
word
word
word
3rd sample
Acceleration_X_4 2
Acceleration_Y_4 2
Acceleration_Z_4 2
word
word
word
4th sample
Acceleration_X_5 2
Acceleration_Y_5 2
Acceleration_Z_5 2
word
word
word
5th sample
Acceleration_X_6 2
Acceleration_Y_6 2
Acceleration_Z_6 2
word
word
word
6th sample
Acceleration_X_7 2
Acceleration_Y_7 2
Acceleration_Z_7 2
word
word
word
7th sample
Acceleration_X_8 2
Acceleration_Y_8 2
Acceleration_Z_8 2
word
word
word
8th sample
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dword
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See chapter 'Status Bits'
Example for Data Record A:
17
20
6B
B3
CE
CC
BB
D1
00
00
01
01
01
01
01
01
89
00
9E
CA
CA
BA
D1
CC
9A
00
01
01
01
01
01
01
14
54
B6
C5
BA
D1
CC
20
19
01
01
01
01
01
01
00
1F
6F
B1
B9
D0
CC
BB
82
02
01
01
01
01
01
01
01
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9.2.2 Data Record B 'All Variables': header = 21, size = 64 bytes
This data record contains all variables measured by the data logger.
Records of this type are recorded continuously to data logger memory 1.) if recording is
enabled, and 2.) if sampling interval B contains a valid value.
A record of this type is also returned in response to Command 'R'.
Name
# Bytes
Format Comment
Header
Date
2
2
word
word
Time in ms
4
dword
Light_IR
4
dword
Light_Red
4
dword
Light_Green
4
dword
Light_Blue
4
dword
Light_UV
4
dword
Pressure
4
dword
System Voltage
4
dword
Temperature_1
4
dword
Temperature_2
2
word
= 21 (=0x15)
The number of days that have passed since 12/30/1899
Example: 1/1/2000 ... Date = 35069
Time of day in multiples of 1/1024 second
Calculation of true value x from raw data value xRAW:
x = a0.a1 + a1. xRAW
Approximate values of parameters:
a0 = -8.370e+6, a1 = -9.000e-5
unit: mW/m2.nm
Calculation of true value x from raw data value xRAW:
x = a0.a1 + a1. xRAW
Approximate values of parameters:
a0 = -8.393e+6, a1 = -1.050e-4
unit: mW/m2.nm
Calculation of true value x from raw data value xRAW:
x = a0.a1 + a1. xRAW
Approximate values of parameters:
a0 = -8.300e+6, a1 = -1.000e-4
unit: mW/m2.nm
Calculation of true value x from raw data value xRAW:
x = a0.a1 + a1. xRAW
Approximate values of parameters:
a0 = -8.377e+6, a1 = -1.070e-4
unit: mW/m2.nm
Calculation of true value x from raw data value xRAW:
x = a0 + a1.exp(a2. xRAW)
Approximate values of parameters:
a0 = -1.000e0, a1 = 1.000e0, a2 = 4.000e-7
unit: mW/m2.nm
Calculation of true value x from raw data value xRAW:
x = a0 + a1. xRAW
Approximate values of parameters:
a0 = -1884, a1 = 2.200E-4, unit: hPa
Calculation of true value x from raw data value xRAW:
x = a0 + a1. xRAW
Approximate values of parameters:
a0 = 0, a1 = 4.20935E-7, unit: V
Calculation of true value x from raw data value xRAW:
x = a0 + a1. xRAW
Approximate values of parameters:
a0 = -261, a1 = 8.26E-5, unit: deg C
Sensor not implemented
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Humidity
Acceleration_X
2
2
word
word
Acceleration_Y
2
word
Acceleration_Z
2
word
Status
Battery Voltage
4
2
dword
word
Unused
8
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Sensor not implemented
Calculation of true value x from raw data value xRAW:
x = a0 + a1. xRAW
Approximate values of parameters:
a0 = -7.40, a1 = 0.015, unit: g
Calculation of true value x from raw data value xRAW:
x = a0 + a1. xRAW
Approximate values of parameters:
a0 = -7.40, a1 = 0.015, unit: g
Calculation of true value x from raw data value xRAW:
x = a0 + a1. xRAW
Approximate values of parameters:
a0 = +7.80, a1 = -0.016, unit: g
See chapter 'Status Bits'
Calculation of true value x from raw data value xRAW:
x = a0 + a1. xRAW
not defined
1 Data record ... 64 bytes
Note: The specified parameters a0, a1,a2 are approximate values only.
Example for Data Record B:
15
F1
01
ED
5F
00
C1
E3
00
6A
0A
64
55
00
01
0E
89
7E
80
13
6C
00
24
97
9A
00
00
00
00
00
00
EA
F3
E1
49
00
B1
D4
83
7D
20
E3
04
00
FE
01
01
34
1F
7F
80
00
34
CD
52
9A
02
00
00
00
00
01
D2
9C
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9.2.3 Data Record 'System Event': header = 10, size = 64 bytes
Certain system events write a system event record to memory. This record may be used for
diagnostic purposes
Name
# Bytes
Format Comment
Header
Date
2
2
word
word
Time in ms
4
dword
Event_ID
Status
Config_1
Config_2
Config_3
Config_4
Scheduler_Date_1
Scheduler_Time_1
Scheduler_Date_2
Scheduler_Time_2
SplIntv_A
SplIntv_B
RecIntv_A
RecIntv_B
RecCnt
Status_1
Status_2
BatVoltage
SerialNo
Unused
2
4
4
4
4
4
2
2
2
2
2
2
2
2
4
4
4
2
4
4
word
dword
dword
dword
dword
dword
word
word
word
word
word
word
word
word
dword
dword
dword
word
char[4]
= 10
The nr. of days that have passed since 12/30/1899
Example: 1/1/2000 ... Date = 35069
Time of day in multiples of 1/1024 second
Event-ID
See chapter 'Status bits'
See chapter 'Configuration bits'
Sample interval A
Sample interval B
Recording interval A, not used
Recording interval B
Nr. of data records
not defined
System Event ID constants:
Event-ID
Description
10
11
12
13
14
Reset, unspecified
Reset, caused by power-on
Reset, caused by brown-out
Reset, caused by watchdog timer time-out
Reset, caused by program instruction
20
21
22
23
Power, unspecified
USB power was connected
USB power was disconnected
Low Power condition
30
31
32
Settings changed by user
Recording was switched on
Recording was switched off
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Status bits ( firmware version 1.x, obsolete)
Status_USB
Status_POWLOW
Status_SW1
Status_SW2
Status_SW3
Status_REC
Status_MEMFULL
Status_SD
Status_1.b0
Status_1.b1
Status_1.b2
Status_1.b3
Status_1.b4
Status_1.b5
Status_1.b6
Status_1.b7
//
//
//
//
//
//
//
//
Status_SUM_A
Status_SUM_B
Status_2.b0
Status_2.b1
// Accumulate A enabled
// Accumulate B enabled
Status_POWOPAMP
Status_POWACCEL
Status_POWHUM
Status_POWPRESS
Status_POWRGB
Status_POWMAG
Status_POWMIC
Status_ACCRANGE
Status_3.b0
Status_3.b1
Status_3.b2
Status_3.b3
Status_3.b4
Status_3.b5
Status_3.b6
Status_3.b7
//
//
//
//
//
//
//
//
Status_4
// b0-b2 define gain for photodiodes
9.4
USB is power source
Power is low
Button was pressed
Button was pressed for 2 seconds
Button was pressed for 10 seconds
Recording is enabled
Recording memory is full
SD card is inserted
Power status OpAmp
Power status Accelerometer
Power status Humidity Sensor
Power status Pressure Sensor
Power status RGB Sensor
Power status Magnetometer
Power status Microphone
Accelerometer range
Status bits ( firmware version 2.x )
Status_SW1
Status_SW2
Status_SW3
Status_SPL
Status_REC
Status_MEMFULL
Status_SD
Status_1.b0
Status_1.b1
Status_1.b2
Status_1.b4
Status_1.b5
Status_1.b6
Status_1.b7
//
//
//
//
//
//
//
Button was pressed
Button was pressed for 2 seconds
Button was pressed for 10 seconds
Sampling is enabled
Recording is enabled
Recording memory is full
SD card is inserted
Status_POWUSB
Status_POWLOW
Status_POWOPAMP
Status_POWACCEL
Status_POWHUM
Status_POWPRESS
Status_POWRGB
Status_POWMAG
Status_2.b0
Status_2.b1
Status_2.b2
Status_2.b3
Status_2.b4
Status_2.b5
Status_2.b6
Status_2.b7
//
//
//
//
//
//
//
//
USB is power
Power is low
Power status
Power status
Power status
Power status
Power status
Power status
Status_POWMIC
Status_POWAUX
Status_FORCEPOWB
Status_FORCEPOWE
Status_SUM_A
Status_SUM_B
Status_ACCRANGE
Status_3.b0
Status_3.b1
Status_3.b2
Status_3.b3
Status_3.b4
Status_3.b5
Status_3.b6
//
//
//
//
//
//
//
Power status Microphone
Power status Auxilary
Force Power on battery enabled
Force Power on external enabled
Accumulate A enabled
Accumulate B enabled
Accelerometer range
Status_4
// b0-b2 define gain for photodiodes
source
OpAmp
Accelerometer
Humidity Sensor
Pressure Sensor
RGB Sensor
Magnetometer
OT - Sensor - Manual v3.10.doc
LightWatcher / Personal Data Logger - Manual
Author:
9.5
OT
Report
Version
Date
Page
LW_Manual
3.10
April 2014
59 of 60
Configuration bits ( firmware version 2.x )
Config_LED1_CMD
Config_LED1_SEC
Config_LED1_SPL
Config_LED1_REC
Config_SPL
Config_REC
Config_SCHEDULER
Config_1.b0
Config_1.b1
Config_1.b2
Config_1.b3
Config_1.b4
Config_1.b5
Config_1.b6
//
//
//
//
//
//
//
Enable
Enable
Enable
Enable
Enable
Enable
Enable
LED1 every command
LED1 every second
LED1 when sampling data
LED1 when recording data
Sampling
Recording
Scheduler
Config_SW2_BUZ
Config_SW2_TGLREC
Config_SW3_RESET
Config_FORCEPOWBAT
Config_FORCEPOWEXT
Config_SUM_A
Config_SUM_B
Config_2.b0
Config_2.b1
Config_2.b3
Config_2.b4
Config_2.b5
Config_2.b7
Config_2.b7
//
//
//
//
//
//
//
Enable Sound BUZZER when SW2 pressed
Enable Toggle RECORDING when SW2 prs.
Enable RESET when SW3 pressed
Force power if on battery power
Force power if on external power
Enable accumulate A, not used
Enable accumulate B
Config_3
// not used
Config_I_BAT
Config_I_SND
Config_I_CLOCK
Config_I_FLASH
Config_I_SD
Config_I_AUX
Config_ACTIVATED
Config_NOTVALID
Config_4.b0
Config_4.b1
Config_4.b2
Config_4.b3
Config_4.b4
Config_4.b5
Config_4.b6
Config_4.b7
//
//
//
//
//
//
//
//
Device has a battery
Device has a buzzer
Device has a real time clock
Device has a flash memory
Device has a SD card memory
reserved
Device activated
if == 1
Config is only valid if == 0
Config_Light_Vis
Config_Light_IR
Config_Light_Red
Config_Light_Green
Config_Light_Blue
Config_Light_UV
Config_Temp_1
Config_Temp_2
Config_5.b0
Config_5.b1
Config_5.b2
Config_5.b3
Config_5.b4
Config_5.b5
Config_5.b6
Config_5.b7
//
//
//
//
//
//
//
//
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
data
data
data
data
data
data
data
data
acquisition
acquisition
acquisition
acquisition
acquisition
acquisition
acquisition
acquisition
Config_Pressure
Config_SysVoltage
Config_Humidity
Config_Accel_X
Config_Accel_Y
Config_Accel_Z
Config_BatVoltage
Config_sysVoltage
Config_6.b0
Config_6.b1
Config_6.b2
Config_6.b3
Config_6.b4
Config_6.b5
Config_6.b6
Config_6.b7
//
//
//
//
//
//
//
//
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
data
data
data
data
data
data
data
data
acquisition
acquisition
acquisition
acquisition
acquisition
acquisition
acquisition
acquisition
Config_Mag_X
Config_Mag_Y
Config_Mag_Z
Config_Mag_Aux
Config_Microphone
Config_7.b0
Config_7.b1
Config_7.b2
Config_7.b3
Config_7.b4
//
//
//
//
//
Enable
Enable
Enable
Enable
Enable
data
data
data
data
data
acquisition
acquisition
acquisition
acquisition
acquisition
Config_Accel_Range
Config_LED2
Config_TimeCorr
Config_IRCorr1
Config_IRCorr2
Config_8.b0
Config_8.b4
Config_8.b5
Config_8.b6
Config_8.b7
//
//
//
//
//
Accelerometer range, 1 = high
Enable LED2 on
Enable Time correction
Enable IR
correction 1
Enable IR
correction 2
OT - Sensor - Manual v3.10.doc
LightWatcher / Personal Data Logger - Manual
Author:
Gain
Rate
PrePower_A
PrePower_B
Config_9
(Config_9
Config_10
(Config_10
Config_11
Config_12
&
&
&
&
OT
Report
Version
Date
Page
LW_Manual
3.10
April 2014
60 of 60
0x07 //Gain for photodiodes
0xF0) >> 4
0x0F
0xF0) >> 4
// not used
// not used
OT - Sensor - Manual v3.10.doc