Operating manual
Photo-Radiometer / Dosimeter
A.O.R.
HD2402
www.deltaohm.com
English
Keep for future reference.
Companies / Brands of GHM
HD2402 - 2 - V1.4
HD2402
Photo-Radiometer / A.O.R. Dosimeter
HD2402 - 3 - V1.4
FRONT
1. LASER LED
2. Radiometric sensor for the measurement of UV band (220÷400 nm)
3. Radiometric sensor for the measurement of NIR band (700÷1300 nm)
4. Not used
5. Radiometric sensor for the measurement of UVA band (315÷400 nm)
6. Photometric sensor for the measurement of visible radiation (Luxmeter)
7. Radiometric sensor for the measurement of BLUE band (400÷600 nm)
8. Not used
9. Thermopile sensor for the measurement of NIR-FIR band (400÷2800 nm)
BACK AND SIDE
10. Push-button for the LASER diode pointer activation and for the instrument
control when this is not connected to a PC
11. LED indicator: displays the instrument status
12. Handle
13. M12 connector for the instrument connection to a PC or to a power supply unit
14. Tripod
15. Connection for fixing the instrument to the tripod
ATTENTION !
WHEN SWITCHING ON THE LASER, DO NOT EXPOSE EYES
OR SKIN TO THE LASER DIRECT RADIATION.
WHEN THE LASER IS SWITCHED ON, MAKE SURE THAT
NO ONE CROSSES INADVERTEDLY THE LASER BEAM
HD2402 - 4 - V1.4
TABLE OF CONTENTS
1 I
NTRODUCTION..................................................................................... 5
2 R
ADIOMETRY OVERVIEW....................................................................... 8
2.1 Irradiance..........................................................................................8
2.2 R
adiance ...........................................................................................9
3 O
PERATING PRINCIPLE........................................................................11
4 I
NSTALLATION OF THE INSTRUMENT....................................................15
4.1 Connection to a PC............................................................................ 15
5 D
ESCRIPTION OF OPERATION ..............................................................16
6 MAN
AGEMENT OF A MEASUREMENT CAMPAIGN WITH DELTALOG13.......18
6.1 Setting measurement scales............................................................... 18
6.2 Log
ging mode .................................................................................. 19
6.3 Download of the measurements stored in the PC.................................... 20
6.4 D
ata analysis and evaluation report ..................................................... 21
6.4.1 Ge
ometrical parameters ...........................................................25
6.4.2 Lu
xmeter table .......................................................................26
6.4.3 Ta
ble a. 180-400..................................................................... 27
6.4.4 Table b. 315-400..................................................................... 27
6.4.5 T
able c.d. 300-700 .................................................................. 28
6.4.6 T
able g.h.i. 380-1400............................................................... 33
6.4.7 Ta
ble j.k.l. 780-1400 ...............................................................38
6.4.8 Ta
ble m.n.o. 380-3000............................................................. 43
6.4.9 Notes table............................................................................. 44
6.4.10R
eport table ........................................................................... 44
7 SPE
CTRAL CHARACTERISTICS...............................................................46
7.1 Sp
ectral interval 180-400nm .............................................................. 46
7.2 Sp
ectral interval 315-400nm (UVA) ..................................................... 47
7.3 Sp
ectral interval 300-700nm .............................................................. 47
7.4 Sp
ectral interval 380-1400nm .............................................................48
7.5 Sp
ectral interval 780-1400nm .............................................................48
7.6 Spectral interval 380-3000nm............................................................. 49
8 SE
NSOR CALIBRATION .........................................................................50
9 T
ECHNICAL SPECIFICATIONS ...............................................................51
10 ST
ORAGE .............................................................................................53
11 SAF
ETY INSTRUCTIONS........................................................................53
12 O
RDER CODES ......................................................................................54
HD2402 - 5 - V1.4
1 INTRODUCTION
HD2402 is a portable datalogger photo-radiometer for the measurement of noncoherent optical radiations in accordance with 2006/25/CE European directive and legislative decree No 81 of 9 April 2008.
The instrument consists of a series of sensors used to cover the different portions of
the spectrum and of a small LASER used to point the analyzed source.
The different sensors operate in the following spectral ranges:
• Photometric sensor for the measurement of illuminance (luxmeter) in the spec-
tral range 380÷780 nm.
• Radiometric sensor for UV band (220÷400 nm) with spectral weight factor S(λ).
• Radiometric sensor for UVA band (315÷400 nm).
• Radiometric sensor for 400÷700 nm (blue) band with spectral weight factor
B(λ).
• Radiometric sensor for IR band (700÷1300 nm) with spectral weight factor
R(λ).
• Thermopile sensor for the measurement of infrared radiance, 400÷2800 nm
spectral range.
HD2402 unit can be powered through connection to the USB port of a PC, or through
an external power supply unit provided with an USB port (SWD05 code). The CP24H
connection cable is provided with a M12 connector on the instrument side and with an
A-type USB connector on the PC side or on the SWD05 power supply unit side.
HD2402 can be configured (calendar, date, time, start time and logging time) by
means of DeltaLog13 software and a PC; additionally, stored data can be down-
loaded and analyzed and new data can be acquired in real time. Once configured, the
datalogger can be disconnected from the PC and connected to the power supply unit
for data acquisition and storage according to the programmed settings.
The unit is provided with a button for data storage manual start/stop when the unit is
not connected to a PC.
A LED indicator on the back of the unit shows the instrument’s acquisition state.
The legislative decree No 81/08, paragraph 5, establishes the measurement of artificial optical radiations (AOR) produced by incoherent light and coherent light (LASER).
HD2402 unit can perform characterization of incoherent sources and in this manual,
unless otherwise specified, reference will be made only to this kind of sources.
Attachment No 37 of L.D. 81/08 provides the formulas (Table 1) to determine the biophysically-relevant limit values of exposure to optical radiations.
HD2402 - 6 - V1.4
(a)
t
0
eff
H =
∫∫
=λ nm400
=λ nm180
tdd)(S)t,(E
...
λ
λλλ
(H
eff
is only relevant in the range 180 to 400 nm)
(b)
H
UVA
=
t
0
λ = 400 nm
λ = 315 nm
(λ, t)
.
dλ . dt
∫∫
E
λ
(H
UVA
is only relevant in the range 315 to 400 nm)
(c), (d)
LB = Lλ (λ) . B(λ) . dλ
λ = 700 nm
λ = 300 nm
∫
(LBis only relevant in the range 300 to 700 nm)
(e), (f)
∫
700 nm
B
λ
d)λ(B)
λ
λ
(E
E
=λ
= 300 nmλ
..
=
(EBis only relevant in the range 300 to 700 nm)
(g) to (l)
LR = L
λ
R
d
λ
.
(λ)
λ
2
λ
1
∫
.
(λ)
(See Table 1.1 for appropriate values of λ1and λ2)
(m), (n)
∫
⋅=
=λ
=λ
λ
nm 3000
nm 780
IR
dλ)(λ EE
(EIRis only relevant in the range 780 to 3 000 nm)
(o)
∫∫
⋅⋅=
=λ
=λ
λ
t
0
nm 3000
nm 380
skin
dtdλ)t,(λ EH
(H
skin
is only relevant in the range 380 to 3 000 nm)
Table 1: formulas for the calculation of limit values
Where :
E
λ
(λ,t),
E
λ
Spectral irradiance or spectral power density: the radiant power incident per
unit area upon a surface, expressed in watts per square meter per nanometer [W/(m
2
nm)]; El (λ,t) and Eλ values come from measurements or can be
supplied by the manufacturer of the equipment;
E
eff
Effective irradiance: calculated irradiance within the UV wavelength range
180 to 400 nm, spectrally weighted by S (λ), expressed in watts per square
meter [W/m2];
H Radiant exposure: the time integral of the irradiance, ex
p
ressed in joule per
square meter [J/m2];
H
ef
f Effective radiant exposure: spectral weighting by S (λ) radiant exposure,
expressed in joule per square meter [J/m2];
E
UVA
Total irradiance (UVA): calculated irradiance within the UVA wavelength
range 315 to 400 nm, expressed in watts per square meter [W/m2];
H
UVA
Radiant exposure: the time and wavelength integral or sum of the irradiance
within the UVA wavelength range 315 to 400 nm, expressed in joule per
square meter [J/m2];
S (λ) Spectral weighting taking into account the wavelength dependence of the
health effects of UV radiation on eye and skin [dimensionless];
t, Δt Time, duration of the exposure, expressed in seconds [s];
λ Wavelength, expressed in nanometers [nm];
Δλ Bandwidth, expressed in nanometers [nm], of calculation or measurement
intervals;
L
λ
(λ),
L
λ
Spectral radiance of the source, expressed in watts per square meter
per
steradian per nanometer [W/(m2 sr nm)];
HD2402 - 7 - V1.4
R (λ) Spectral weighting taking into account the wavelength dependence of the
thermal injury caused to the eye by visible and IRA radiation [dimensionless];
L
R
Effective radiance
(
thermal injury): calculated radiance spectrally weighted
by R(λ), expressed in watts per square meter per steradian per nanometer
[W/(m2 sr)];
B (λ) Spectral weighting taking into account the wavelength dependence of the
photochemical injury caused to the eye by the blue light radiation [dimensionless];
L
B
Effective radiance (blue light): calculated radiance spectrally weighted by B
(λ), expressed in watts per square meter per steradian [W/(m2 sr)];
E
B
Effective irradiance (blue light): calculated irradiance spectrally weighted b
y
B (λ), expressed in watts per square meter [W/m2];
E
IR
Total irradiance (thermal injury): calculated irradiance within the infrared
wavelength range 780 nm to 3 000 nm, expressed in watts per square meter [W/m
2
];
E
skin
Total irradiance (visible, IRA and IRB): calculated irradiance within the visi-
ble and infrared wavelength range 380 nm to 3 000 nm, ex
p
ressed in watts
per square meter [W/m2];
H
skin
Radiant exposure, the time and wavelength integral or sum of the irradiance
within the visible and infrared wavelength range 380 nm to 3 000 nm, expressed in joule per square meter [J/m
2
];
α Angular subtense: the angle subtended by an apparent source, as observed
at a point in space, expressed in milliradians (mrad). Apparent source in the
real or virtual object that forms the smallest possible retinal image.
Limits depend on the wavelengths of the analyzed light and on the kind of injury to be
taken into consideration.
Also the physical quantities of interest (irradiance [W/m
2
], radiance [W/(m2sr)]) differ
depending on the kind of injury to be taken into consideration.
HD2402 - 8 - V1.4
2 RADIOMETRY OVERVIEW
The foregoing exposition is far from being exhaustive, but will be useful to make the
HD2402 unit operation known and to understand the approximations made by the instrument for the calculation of the various radiometric quantities requested by L.D. No
81/08.
2.1 IRRADIANCE
Irradiance E
i
at a point of a surface is defined as the density of energetic flux d
Φ
I
that
flows through the unit area dA (Figure 1):
dA
d
E
i
i
Φ
=
dA
d
Figure 1: irradiance
The irradiance measurement unit is [W/m
2
]; when calculated at different wavelengths,
we have spectral irradiance [W/(m
2
nm)].
From the definition of irradiance we obtain some properties useful for understanding
the light behavior:
1. We have maximum irradiance on a surface when the incident light beam is perpendicular to the surface and decreases with the incident angle according to the
cosine formula (Law of Cosine):
)cos(
0_
θ
⋅
=
ii
EE
where:
E
i
is the irradiance on the surface taken into consideration,
E
i—0
is the irradiance when the surface is perpendicular to the flux,
θ is the angle between the surface and the flux direction.
2. As to a point light source (or to be considered as such) that radiates light uniformly in all directions (isotrope), the irradiance produced on a surface decreases
with the square of the distance.
d
Φ
HD2402 - 9 - V1.4
2.2 RADIANCE
Radiance L
i
at a point of a surface is defined as the energetic flux d2ΦI that flows
through a surface dA per unit solid angle dΩ (Figure 2):
Ω⋅
Φ
=
ddA
d
L
i
2
Figure 2: radiance
The radiance measurement unit is [W/(m
2
sr)]; when calculated at different wave-
lengths, we obtain the spectral radiance [W/(m
2
nm sr)].
A solid angle is the angle subtended at a point P by a closed surface A. It is calculated
as the relation between the surface projected on a sphere of radius R with center in P
and R
2
. The measurement unit of a solid angle is the steradian [sr] and its value
ranges between 0 and 4π.
Radiance and irradiance are two different quantities. Radiance describes the angular
distribution of radiation while irradiance integrates radiance in all directions. The primary relation linking irradiance to radiance is:
(
)
ωθφθ
dLE
ii
)cos(,
∫
Ω
⋅=
If radiance is uniform, then the term L(θ,φ) can be taken out from the integral and the
expression is simplified as follows:
FLdE
i
i
i
L
⋅==
∫
Ω
ωθ
)cos(
Where F depends only on geometry.
In these particular conditions, the radiance value can be obtained from that of the irradiance: hence, the formula will be:
F
E
L
i
i
=
Remark: for small angles, F is actually the solid angle under which the observer
source is seen.
By using this reduction, HD2402 unit allows to calculate the radiance of the irradiance
measured values.
HD2402 - 10 - V1.4
Similar definitions apply to photometry where irradiance will be replaced by illuminance (lux) and radiance by luminance [cd/m
2
].
More generally, the link between any spectral radiometric quantity GR(
λ
) and the cor-
responding photometric quantity GF is given by the following formula:
∫
⋅⋅=
780
380
)()(683
λλλ
dVGRGF
where :
V(λ) is the photopic vision curve (Figure 3), 380nm and 780nm are the integration ex-
tremes, out of these extremes V(λ)=0.
Figure 3: luminous efficacy curve for the photopic vision
The photopic vision curve represents the luminous efficacy of the human eye under
daylight conditions (in lowlight conditions, the response curve of the human eye
changes, and we talk about a scotopic vision).
HD2402 - 11 - V1.4
3 OPERATING PRINCIPLE
6 sensors are used for the measurement of optic radiations. Each sensor covers a given spectral range and measurements in conformity with L.D. 81/08 can be performed
through the combination of signals coming from several sensors. The sensors used are
photodiodes, except for channel 9 that utilizes a thermopile sensor.
The instrument is provided with a pointing LASER to indicate to the user the area outlined by the instrument. The LASER is switched on by means of the button on the rear
of the instrument. By pressing the button, the LASER is switched on for 10 seconds.
HD2402 is powered through the USB cable, when it is connected to a PC. The red indicator on the back of the instrument shows that the instrument is properly powered.
Table 2 lists all channels available in the instrument with their spectral range and corresponding spectral weighting curve (V[λ], S[λ], B[λ], R[λ]), implemented through the
use of appropriate filters.
Channel Measure quantity
Spectral range and corresponding weighting curve
Sensor type
6 Illuminance [Lux]
380nm÷780nm; V[λ]
Photodiode + Filter
2 Irradiance [W/m2]
220nm÷400nm; S[λ]
Photodiode + Filter
5 Irradiance [W/m2] 315nm÷400nm; UVA Photodiode + Filter
7 Irradiance [W/m2]
400nm÷600nm; B[λ]
Photodiode + Filter
3 Irradiance [W/m2]
660nm÷1300nm; R[λ]
Photodiode + Filter
9 Irradiance [W/m2] 400nm÷3000nm Thermopile
Table 2: measurement channels available in the instrument
Processing of the sensor output signal is handled independently for each channel and
in different modes.
Transimpedance amplifiers are used for channels 3, 5 and 6. Signal is acquired 1000
times per second. Both the average value per second and the peak signal of the 1000
samples acquired is displayed by the software. The amplifiers have 4 scales each, that
are independent of the other. Scale change is automatic or manual.
Channels 2 and 7 use a charge integrator. The integration time depends on the required
sensitivity, ranging from 1 ms in the low sensitivity scale to 1 second in the full sensitivity scale (there are 4 scales, that are independent for the two channels). Also in this
case, the instrument displays the mean value per second and the peak signal of the acquired samples (in the full sensitivity scale, when the integration time is 1 second,
mean value and peak value coincide). The scale change is automatic or manual.
Channel 9 is a power amplifier. There is only 1 scale. In this case, only the mean value is displayed, since the response time of the sensor is of about 9 seconds.
Table 3 shows the full scale values available for each channel:
Channel Meas. unit Full scale 1 Full scale 2 Full scale 3 Full scale 4
6 Lux 399.9 3.999
•
10
3
39.99
•
103 399.9
•
103
2 W/m
2
39.99
•
10-3 399.9
•
10
-3
3.999 39.99
5 W/m
2
3.999 39.99
399.9 3.999
•
103
7 W/m
2
399.9
•
10-3 3.999 39.99 399.9
3 W/m
2
3.999 39.99
399.9 3.999
•
103
9 W/m
2
3.999
•
10
3
Table 3: scales available for each of the instrument’s channels
HD2402 - 12 - V1.4
1,0E-05
1,0E-04
1,0E-03
1,0E-02
1,0E-01
1,0E+00
200 220 240 260 280 300 320 340 360 380 400
Lambda (nm)
Ponderazione
Figure 4: Spectral weighting curve
S(λ) (wavelengths below 200nm are not taken
into consideration, as highly absorbed in air)
0.01
0.1
1
10
700 800 900 1000 1100 1200 1300
Lam bda (nm)
Ponderazi one
Figure 5: Spectral weighting curve
R(λ)
Figure 6: Spectral weighting curve B(λ)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
300
350
400
450
500
550
600
650
700
Lambda (nm)
Ponderazione
Weighting
Weighting
Weighting
HD2402 - 13 - V1.4
Table 4 shows the 15 limit values to be calculated according to attachment 37 of L.D.
81/08.
Index Wavelength nm Exposure limit value Units Comment Part of the body Hazard
a. 180-400
(UVA, UVB and UVC)
H
eff
=30
Daily value 8 hours
[J m-2] eye cornea
conjunctiva
lens
skin
photokeratitis
conjunctivitis
cataractogenesis
erythema
elastosis
skin cancer
b. 315-400
(UVA)
H
UVA
=10
4
Daily value 8 hours
[J m
-2
] eye lens cataractogenesis
c. 300-700
(Blue light) see note 1
L
B
¼
10
6
t
for t ≤ 10 000 s
L
B
:[W m-2sr-1]
t: [seconds]
for α ≥ 11 mrad
eye retina photoretinitis
d. 300-700
(Blue light)
see note 1
L
B
=100
for t > 10 000 s
[W m-2sr-1]
e. 300-700
(Blue light)
see note 1
E
B
¼
100
t
for t ≤ 10 000 s
E
B
:[Wm-2]
t: [seconds]
for α < 11 mrad
see note 2
f. 300-700
(Blue light)
see note 1
E
B
= 0,01
t >10 000 s
[W m-2]
g. 380-1 400
(Visible and IRA)
L
R
¼
2,8 · 10
7
C
α
for t >10 s
[W m
-2sr-1
]C
α
= 1,7 for
α ≤ 1,7 mrad
C
α
= α for
1,7 ≤ α ≤ 100 mrad
C
α
= 100 for
α > 100 mrad
λ
1
= 380; λ2= 1 400
eye retina retinal bur n
h. 380-1 400
(Visible and IRA)
L
R
¼
5·10
7
Cαt
0,25
for 10 μs ≤ t ≤ 10 s
L
R
:[W m-2sr-1]
t: [seconds]
i. 380-1 400
(Visible and IRA)
L
R
¼
8,89 · 10
8
C
α
for t <10 μs
[W m
-2sr-1
]
j. 780-1 400
(IRA)
L
R
¼
6·10
6
C
α
fort>10s
[W m
-2sr-1
]C
α
=11for
α ≤ 11 mrad
C
α
= α for
11≤ α ≤ 100 mrad
C
α
= 100 for
α > 100 mrad
(measurement field-of-view:
11 mrad)
λ
1
= 780; λ2= 1 400
eye retina retinal bur n
k. 780-1 400
(IRA)
L
R
¼
5·10
7
Cαt
0,25
for 10 μs ≤ t ≤ 10 s
L
R
:[Wm-2sr-1]
t: [seconds]
l. 780-1 400
(IRA)
L
R
¼
8,89 · 10
8
C
α
for t < 10 μs
[W m
-2sr-1
]
m. 780-3 000
(IRA and IRB)
E
IR
= 18 000 t
-0,75
for t ≤ 1 000 s
E: [W m
-2
]
t: [seconds]
eye cornea
lens
corneal burn
cataractogenesis
n. 780-3 000
(IRA and IRB)
E
IR
=100
for t > 1 000 s
[W m-2]
o. 380-3 000
(Visible, IRA
and IRB)
H
skin
= 20 000 t
0,25
fort<10s
H: [J m
-2
]
t: [seconds]
skin burn
Table 4: exposure limit values for non-coherent radiations
HD2402 - 14 - V1.4
Different limits correspond to different spectral intervals. Some spectral bands coincide with the spectral response of the utilized sensors, while other sensors need to
properly combine several channels. The table shows how HD2402 channels are combined to obtain 13 of the requested 15 limits. Limits e, f are beyond the measurements achievable with the instrument and, on the other hand, are applied to particular sources (typically, ophthalmology instruments).
Limit Nominal spectral
range
Effective spectral
range
Channels
a 180nm÷400nm 220nm÷400nm f (ch2, ch5)
b 315nm÷400nm 315nm÷400nm ch5
c, d 300nm÷700nm 315nm÷700nm f (ch5, ch6, ch7)
g, h, i 380nm÷1400nm 380nm÷1400nm f (ch3, ch6, ch7)
j, k, l 780nm÷1400nm 700nm÷1400nm ch3
m, n 780nm÷3000nm 400nm÷3000nm ch9
o 400nm÷3000nm 400nm÷3000nm ch9
Table 5: calculation of a-o limits from channels available in the instrument
The quantity measured by HD2402 instrument is always irradiance (or illuminance for
what concerns channel 0), while limits c to l are calculated from the radiance value.
As illustrated in chapter 2 (Radiometry overview), the two quantities are related and
radiance can be obtained from irradiance (assuming that radiance is constant), provided that the geometric parameters of the measured source are known.
The details of the calculation will be shown in the software description. Even in case
the geometric parameters of the source are not known, it is anyway possible to estimate the requested quantities.
HD2402 - 15 - V1.4
4 INSTALLATION OF THE INSTRUMENT
The instrument is provided with a single cable (cod. CP24H), ending with a M12 connector at the instrument side and an A-type USB connector at the other end. The cable is used both for connection to the external SWD05 power supply unit and for connection to a PC; in this case, it is directly powered by the USB port of the PC.
The instrument takes about 15 seconds to be operative after connection to a PC or to
the power supply unit. During this period, The LED on the back of the instrument
blinks once per second. When the Led starts blinking once every three seconds, the
instrument is operating.
The instrument is provided with an internal rechargeable battery allowing operation of
the internal clock even in the absence of an external power supply. The battery is recharged when the instrument is powered. In the absence of an external power supply,
the battery autonomy is of about two months. If the instrument is not connected to a
power supply unit or to a PC for more than two months, date and time are cleared and
will have to be set again by means of DeltaLog13 software.
During measurements, the instrument must be fixed to the tripod VTRAP20 by
means of the fitting on the instrument side, so as to obtain a better precision and stability in pointing towards the optical radiation source.
In order to perform the measurements, remove the rubber cap protecting the sensors.
To direct the instrument with better accuracy towards the radiation source, turn on
the LASER by pressing the button on the rear.
4.1 CONNECTION TO A PC
PC-connection operations, setting of operation parameters, measurement setting, data transfer, graphic display and print of acquired or stored measurements can be managed thanks to the DeltaLog13 software, downloadable from Delta OHM website.
The instrument is connected to a USB port of a PC through the CP24H cable. The USB
connection doesn’t require the installation of drivers: when the the instrument is connected to the PC, Windows® operating system automatically recognizes the instrument as an HID (Human Interface Device) device and uses the drivers already included in the operating system.
HD2402 - 16 - V1.4
5 DESCRIPTION OF OPERATION
The instrument has two operation modes:
• Instrument connected to the USB port of the PC and managed through the Delta-
Log13 software
The instrument is powered through the USB port of the PC.
A short blink every 3 seconds of the rear LED indicates that the instrument is properly powered.
In order to use the DeltaLog13 software, the supplied CH20-ROA software
key must be introduced in a second USB port of the PC.
The instrument connected to the PC is automatically recognized by the software.
After the software startup, the PC monitor shows all measurements in real time.
The displayed values concern the spectral intervals requested in Attachment 37, paragraph 5 of chapter 8 of L.D. 81/08. Besides, all the commands needed to start the
measurement campaign are available in the window (see chapter 6 at page 18).
The following functions are available in the command bar, located at the top of the
program window (you will find more details on the use of these commands in the on-
line help of DeltaLog13 software):
Project icon: by selecting the icon a new project can be created (option New Pro-
ject) or an existing one can be opened (option Open Project).
Open…icon: allows to open data files or reports regarding measurements that have
already been performed or saved in the folders Logging and Reports in the predefined folder (preset in C:\DL13_HD2402 but user changeable).
HD2402 - 17 - V1.4
Start PC Log icon: starts manually logging measurements that will be directly
saved in the PC. After starting logging, the icon changes in Stop PC Log, allowing to
stop logging when desired.
Start Logging icon: starts manually logging measurements that will be saved in the
internal memory of the instrument. After starting logging, the icon changes in Stop
Logging, allowing to stop logging when desired.
Dump LOG icon: allows to download in the PC measurements saved in the internal
memory of the instrument.
Instrument setup icon: allows to perform the following settings:
o Start time and duration of a programmed logging;
o Full scale of the measurement range for each channel of the instrument;
o Internal clock;
o Identification code of the instrument.
Calculator icon: allows to calculate the risk index by manually entering the irradi-
ance data.
• Instrument not connected to a PC and powered through an external power supply
unit.
In this mode, the instrument can be programmed through the DeltaLog13 software
and can perform an acquisition with programmed startup and preset time interval, or
can be controlled by means of the rear button.
The LED blinks every 3 seconds until acquisition is started and will blink once per
second since acquisition startup.
To start and stop logging by means of the rear button, proceed as follows:
Lo
gging startup
1 keep the button depressed for at least three seconds;
2 the LED indicator will start blinking twice per second;
3 keep the button depressed for other two seconds;
4 if the measurement is in process, the LED blinks shortly every second.
Lo
gging stop
1 keep the button depressed for at least three seconds;
2 the LED indicator will start blinking twice per second;
3 keep the button depressed for other two seconds;
4 if the measurement was stopped, the LED blinks shortly every 3 seconds.
Memory capacity
The instrument saves data every second. Up to 96000 samples can be stored, that
are equivalent to 26 hours of continuous acquisition. Memory is cyclic, so data are
overwritten starting from the older sample, once the available space is depleted.
HD2402 - 18 - V1.4
6 MANAGEMENT OF A MEASUREMENT CAMPAIGN WITH
DELTALOG13
The chapter describes all steps needed to perform a measurement campaign, with the
purpose to evaluate and analyze one or more sources and positions in the same place.
A measurement campaign is performed through the following steps:
1. Setting measurement scales for the different channels;
2. Setting mode and duration of the measurement log;
3. Measurement log;
4. Download to a PC of the acquired measures, if these were stored in the in-
ternal memory of the instrument.
5. Analysis of data and issue of evaluation report.
6.1 SETTING MEASUREMENT SCALES
Before every reading it is of the utmost importance to check that the proper measurement ranges are set in the instrument. If the set measurement range is too small,
measurements can be beyond full scale, thus not allowing a proper evaluation of the
readings.
4 measurement scales are available for all the channels, except for channel 9, that
has only one measurement scale (Table 3 at page 11).
In order to set measurement ranges, connect the instrument to a PC, start DeltaLog13 and wait for the automatic identification of the instrument. Select the Instru-
ment Setup icon and then the Input setting item. The following window will appear:
The following values are displayed for each measurement channel, except for channel
9: measured value (mean value per second), peak value (per second), preset measurement scale and current scale, that is the scale in use at the moment of the last acquisition.
The preset scale is in light blue color. All scales are factory preset to AUTO (automatic). Scales for each channel can be set manually, by mouse-clicking on the desired
scale (the smallest bar indicates the full sensitivity scale).
HD2402 - 19 - V1.4
In case of doubt, it is advisable to select the AUTO setting, leaving to the instrument
the most appropriate choice to use.
Once a new scale is set, the Apply key must be pressed to activate the change. When
pressing the Apply key, the setting of inputs is saved in the instrument and will remain active even if the instrument is subsequently disconnected.
If a channel measurement is beyond full scale, the corresponding indicator in the column Ovf will appear in red color.
6.2 LOGGING MODE
It is possible to select if to directly log measurements in a PC or in the external memory of the instrument.
PC data logging can only be started manually by selecting the Start PC Log icon.
In this case, the instrument will necessarily have to remain connected to the PC during data logging. After logging startup, the Start PC Log icon is replaced by the Stop
PC Log icon. To stop logging, select the Stop PC Log icon. Data are saved in the Monitor folder in the predefined folder; the file will be identified by the logging start/stop
time.
Data logging in the instrument memory can be started in a programmed way or manually. To set the programmed log, select the Instrument setup icon and then the
Logging setting item. The following window will appear:
Select the Auto-Start enable box, set logging start date/time in the Auto-Start Log-
ging line (start time must be subsequent to the current time indicated in the PC Clock
line by at least 20 minutes), set log duration in the Duration of Logging field
HD2402 - 20 - V1.4
(hh:mm:ss). Select the Apply key to save the instrument settings, logging will automatically start at the set date/time. The instrument can also be disconnected from the
PC and connected to the power supply unit. The rear LED blinks every 3 seconds until
acquisition is started; the Led will start blinking once per second from the moment acquisition is started.
Manual logging in the instrument memory is started by selecting the Start Logging
icon (or in alternative by pressing the rear button for 5 seconds).
After logging startup, the Start Logging icon is replaced by the Stop Logging icon. To
manually stop logging, select the Stop Logging icon (or in alternative press the rear
button for 5 seconds). Data are saved in the Monitor folder in the predefined folder;
the file will be identified by the logging start/stop time
Logging can be manually started and automatically stopped by setting the Duration of
Logging field (hh:mm:ss) in the Auto-Start Logging window. In this case, the Auto-
start enable box must not be selected.
Note: before starting logging, make sure that the instrument date/time are correct, by
selecting the Instrument Setup icon and then the Clock Setting item.
6.3 DOWNLOAD OF THE MEASUREMENTS STORED IN THE PC
If data have been logged in the instrument internal memory, they must be downloaded to a PC for analysis.
Connect the instrument to a PC, start DeltaLog13 and wait for automatic detection of
the instrument. Select the Dump LOG icon.
A list of the files stored in the instrument memory will appear.
The start/stop time for each log is displayed. Select logs to be downloaded and press
the Dump LOG icon. Data are saved in the Logging folder, in the predefined folder;
files will be identified by the logging start/stop time.
HD2402 - 21 - V1.4
Please refer to the software online help for details on the functions available in the
window containing the log list.
6.4 DATA ANALYSIS AND EVALUATION REPORT
Select the Project icon and then the New project item for the analysis of the data detected by the instrument.
The program asks for a name to assign to the project file and the path where to save
it; enter the requested info and press Save, the project window will open.
The data concerning the customer and the author of data evaluation can be entered in
the right panel of the window. As to the management of anagraphic data, see the
software manual.
In the left panel of the window, select the name of the project, press the right key of
your mouse and select New Source.
The program asks to enter a description of the source and the place where it is positioned, enter the requested info and press OK, the entered data appear in the right
panel. In the left panel, the source appears among the project items.
HD2402 - 22 - V1.4
The right panel contains two additional columns: N. Measures Done (number of measures performed on the source) and N. Measures Report (number of measures used to
prepare the evaluation report). The column content is void for the moment and will be
updated afterward, when some measurements will be associated to the source.
Proceed the same way to add other sources to the project.
At this point, the detected measures can be associated to each source. Select a source
and press the right key of your mouse, then select New Measurement and after that
one of the following options:
• From File: to analyze data already logged and saved in a PC;
• From Instrument: to acquire and analyze a new series of measurements in real
time.
If the From File option has been selected, a window will appear where to search for
the log file; select the desired file and press Open.
After choosing the data origin, by selecting a measurement file associated to a source,
the following window will appear.
HD2402 - 23 - V1.4
The window is divided into five panels:
• The panel with the project components (in the upper left side), where the log
file is now present.
• The panel with the selected file information (placed below the panel of the pro-
ject components).
• The panel where the geometric parameters of the analyzed source must be en-
tered (in the lower left side).
• Right lower panel, containing the list of the logged measurements if the option
From File was selected, or the fields where the measurements detected by the
instrument are displayed, if the option From Instrument was selected.
• Right upper panel, containing the risk indexes evaluation results.
If the option From Instrument was selected as the data origin, select the Start icon
(green arrow) to start logging, the right lower panel will display measurements in real
time. To stop acquisition, select the Stop icon (red square), the right lower panel of
the project window will show the list of the acquired measurements. Measurements
are saved in a file in the Monitor folder; the file will appear among the items of the
project in the left upper panel.
The results of the evaluation that are displayed in the right upper panel refer
only to the measurements selected in the list and not to all the listed measurements.
It is possible to keep memory of the selection saving it in the project, by pressing the
Save icon. After the saving, the selection will appear with a gold background. Only the
HD2402 - 24 - V1.4
measurements with a gold background will be considered in the final evaluation report.
The evaluation can be performed using several consecutive measurements, selecting
them by means of the SHIFT key on the PC keyboard (select the first measurement of
the series, then keep the SHIFT key depressed and select the last measurement of the
series), and pressing the Save icon.
If you wish to perform the evaluation keeping into consideration all the measurements
in the file, select the Select All icon and then the Save icon to save the selection in the
project.
The same file can be associated to a source more than once, so as to be able to perform the analysis with different geometric parameters or with a different selection of
measurements.
Selecting the Display Report icon, the evaluation report can be displayed and subsequently printed or exported in different formats. The various sources and logs can be
included or excluded from the report by simply selecting or deselecting the corresponding boxes in the left upper panel, that displays the items of the project.
To save the project, select the Save icon on top of the project window. The geometric
parameters, all measurement data and the measurement selection for each data file
associated to the project are also saved in the project file.
To remove sources or records from the project, select them in the left upper panel
and press the right key of your mouse, then select Delete Source or Delete Measure-
ment.
Details concerning the setting of geometrical parameters and calculation of exposure
limit values requested by the L.D. 81/08 and specified in the tables in the right upper
panel are explained below.
HD2402 - 25 - V1.4
6.4.1 Geometrical parameters
The instrument measures irradiance, while radiance value must be known for calculating some exposure limit values (ELV). If geometric parameters are known, both quantities can be calculated (the solid angle subtended from source to sensor must be
known) through calculation of the geometric parameter F.
The expected geometries are 5:
o Geometric data not available: the event is contemplated, where no indication
can be provided on the source geometry. In this case, data supplied by the
software will be less complete, details are specified in the following paragraphs
illustrating ELV calculation.
o Alpha [deg]: the user supplies the source angular dimension in degrees.
o Omega Solid Angle [sr]: the user supplies the solid angle under which the
source is seen by the measurement device (the measurement unit is the steradian).
o Side d1 [m] - Side d2 [m] – Distance R [m]: assuming that the source has a
rectangular shape whose side lengths are d1 and d2 at R distance from the
measuring device (where the three quantities are expressed in meters), the
software provides for the calculation of the angle (alpha) and of the solid angle
(omega) subtended from the source to the measuring device. Calculation can
be correctly performed by selecting the Alpha Omega rigorous calculation box
or in an approximate way. In this mode, the angles subtended by the two sides
of the rectangle are calculated with the formula:
][
1
1
rad
R
d
=
α
][
2
2
rad
R
d
=
α
o Diameter d [m] – Distance R [m]: assuming that the source has a circular
shape with diameter d and is at R distance from the measuring device (both
measurements are expressed in meters) the software provides for the calculation of the angle (alpha) and of the solid angle (omega) subtended from the
source to the measuring device. Calculation can be correctly performed by selecting the Alpha Omega rigorous calculation calculated with the formula or in
an approximate way. In this mode, the angle subtended from the source with
respect to the measuring device is calculated with the formula:
][rad
R
d
=
α
Once the solid angle is known, the radiance L
i
[W/(m2sr)] is given by the formula:
F
E
L
i
i
=
Where:
Ei is the irradiance measured in W/m2;
F is the geometric parameter in steradians, as described at paragraph 2.2 at page 9.
If
the non rigorous calculation option (suitable for small angles) was selected, F=Ω in
all the mentioned cases.
HD2402 - 26 - V1.4
6.4.2 Luxmeter table
The values measured by the luxmeter are displayed in the Luxmeter table.
The data displayed in the table are:
• Illuminance value in Lux (if a single sample is considered, the value corre-
sponds to the instant value or, if several samples are taken into consideration,
it corresponds to the mean value).
• Alpha angle in degrees, it is the angle under which the analyzed source is seen.
• Alpha angle in radiants, equal to the above mentioned angle, but expressed in
radiants.
• Omega solid angle in steradians, a solid angle under which the analyzed source
is seen. This angle is used for the calculation of luminance.
• Luminance calculated starting from geometric parameters, if available.
The luminance value for the analyzed source is obtained by dividing illuminance
by factor F calculated from geometric data. In case of measurements regarding
ordinary illumination light (white light), if the calculated value is below 10000
cd/m
2
, additional verifications are not necessary and the source is considered
safe (“A Non-Binding Guide to the Artificial Optical Radiation Directive
2006/25/EC” page 74).
• Luminance calculated considering a 100mrad angular aperture.
• Luminance calculated considering a 11mrad angular aperture.
Note: the two last luminance values are supplied in case geometric parameters are
not available or in case Alpha angle obtained from geometric parameters is below
100mrad.
If the Include in Report box is selected, the data in the table will be included in the final report.
HD2402 - 27 - V1.4
6.4.3 Table a. 180-400
Table a. 180-400 describes the exposure limit for parameter “a”.
The displayed data are:
• Effective irradiance value E
eff
[W/m2] (corresponds to the instant value if a single sample is considered, or to the mean value if several samples are considered).
• Effective dose value H
eff
[J/m2] regarding the considered samples.
• Time in hours/minutes/seconds for exceeding 30 J
eff
/m2 maximum daily dose
calculated starting from the irradiance mean value.
If the Include in Report box is selected, the data in the table will be included in the final report.
6.4.4 Table b. 315-400
Table b. 315-400 shows the exposure limit for parameter “b”.
The displayed data are:
• Irradiance value E
UVA
[W/m2] (corresponds to the instant value if a single sam-
ple is considered, or to the mean value if several samples are considered).
• Dose value H
UVA
[J/m2] regarding the considered samples.
• Time in hours/minutes/seconds for exceeding 10000 J
UVA
/m2 maximum daily
dose calculated starting from the irradiance mean value.
If the Include in Report box is selected, the data in the table will be included in the final report.
HD2402 - 28 - V1.4
6.4.5 Table c.d. 300-700
Table c.d. 300-700 shows L
B
exposure limit for parameters “c” and "d”.
The limit varies according to the source observation time and angular dimensions;
consequently, different exposure limits correspond to different observation times and
dimensions. In particular:
L
B
= 106/t [W m-2 sr-1] for t ≤ 10000s (limit c)
L
B
= 100 [W m-2 sr-1] for t > 10000s (limit d)
The displayed values are:
• Irradiance value EB [W/m2] (corresponds to the instant value if a single sample
is considered, or to the mean value if several samples are considered).
• Alpha angle in degrees, it is the angle under which the analyzed source is seen.
• Alpha angle in radiants, equal to the above mentioned angle, but expressed in
radiants.
• Omega solid angle in steradians, a solid angle under which the analyzed source
is seen. This angle is used for the calculation of luminance.
This parameter is evaluated based on the radiance value and not on that of irradiance,
so the more detailed are the entered geometric parameters, the more plentiful will be
the data on limit value.
All possible cases are analyzed in the following.
• Geometric data not available:
o L
B
(100mrad) [W/(m² sr)], radiance calculated assuming that all the light comes
from a circular area whose angular dimension is 100mrad.
This is true for each source (even with an angular dimension below 100mrad) if
the observation time is above 10000s; in fact, for such long time periods any
source has a minimum angular dimension of 100mrad (for the human visual system) (CEI IEC 62471).
If value L
B_100
<= 100 [W/(m² sr)], the limit value is not exceeded and it is not
necessary to take into consideration the other limits. The source belongs to risk
class 0.
If L
B_100
> 100 [W/(m² sr)], the limit is exceeded and the succeeding limit must
be taken into consideration (the observation time is below 10000s, so even the
minimum angular dimension that can be focused by the human eye becomes
smaller, the succeeding limit is that with an angle of 11mrad).
o t_100 [s] time period during which a source can be observed without damages to
the visual system.
HD2402 - 29 - V1.4
If the preceding limit is not exceeded, t_100 will be above 10000s; if this is below, the succeeding limit will have to be taken into consideration.
o L
B
(11mrad) [W/(m² sr)] radiance calculated assuming that all light comes from
a circular area whose angular dimension is 11mrad.
This is true if the observation time is above 10s and below 100s; in fact, for time
periods within this interval the smallest source detected by the human eye is
11mrad (CEI IEC 62471).
If value L
B_11
<= 10000 [W/(m² sr)], the limit is not exceeded and the other lim-
its have to be taken into consideration. The source belongs to risk class 1.
If L
B_11
> 10000 [W/(m² sr)], the limit is exceeded and it is necessary to take into consideration the succeeding limit (the observation time is below 100s, so
even the minimum angular dimension that can be focused by the human eye becomes smaller, the succeeding limit is that with an angle of 1.7mrad).
o t_11 [s] time period during which the source can be observed without damages
to the visual system.
If the preceding limit is not exceeded, t_11 will be above 10s; if this is below,
the succeeding limit will have to be taken into consideration.
o L
B
(1.7mrad) [W/(m² sr)] radiance calculated assuming that all light comes from
a circular area whose angular dimension is 1.7mrad.
This is true if the observation time is below 0.25s (CEI IEC 62471).
If value L
B_1.7
< 4
•
106 [W/(m² sr)], the limit is not exceeded. The source belongs
to risk class 2.
In any case, the maximum exposure time can be calculated, that will always be
below 0.25s.
o t_1.7 [s] t time period during which the source can be observed without dam-
ages to the visual system, calculated from t_1.7=106/L
B_11
.
• Alpha [rad] , the user supplies the angular dimension of the source in radiants or
degrees:
o Alpha [rad] angle subtended by the source in radiants or degrees.
o Omega [sr] solid angle subtended by the source, calculated starting from Alpha
angle assuming that the source shape is circular:
Omega = 2π (1-cos(Alpha/2))
o L
B
(100mrad) [W/(m² sr)] radiance calculated assuming that the source has an
angular dimension of 100mrad.
o L
B
(11mrad) [W/(m² sr)] radiance calculated assuming that the source has an
angular dimension of 11mrad.
o L
B
(1.7mrad) [W/(m² sr)] radiance calculated assuming that the source has an
angular dimension of 1.7mrad.
o L
B
(real) [W/(m² sr)] is the real radiance calculated starting from the entered
geometric parameters.
HD2402 - 30 - V1.4
o t_lim [s] exposure time limit, that is the time period during which the source can
be observed with no problems to the visual system. This value is calculated with
the following procedure:
if L
B_real
< 100 then t_lim > 10000s
(d index satisfied)
if Alpha ≥ 100mrad ⇒
otherwise t_lim = 10
6
/ L
B_real
(c index satisfied)
if L
B_100
< 100 then t_lim > 10000s
(d index satisfied)
If 11mrad ≤ Alpha < 100mrad ⇒
otherwise t_lim = 10
6
/ L
B_real
(c index satisfied)
if L
B_100
< 100 then t_lim > 10000s
(d index satisfied)
if Alpha < 11mrad ⇒
otherwise t_lim = 10
6
/ L
B_11
• Omega [sr] , the solid angle under which the source is seen by the instrument is
supplied by the user:
o Alpha [rad] angle subtended by the source calculated starting from the Omega
solid angle assuming that the source shape is circular:
Alpha = 2(Cos
-1
(1-Omega/2π))
o Omega [sr] solid angle subtended by the source.
o L
B
(100mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 100mrad.
o L
B
(11mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 11mrad.
o L
B
(1.7mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 1.7mrad.
o L
B
(real) [W/(m² sr)] real radiance calculated starting from the entered geomet-
ric parameters.
o t_lim [s] exposure time limit, that is the time period during which the source can
be observed with no problems to the visual system. This value is calculated with
the following procedure:
if L
B_real
< 100 then t_lim > 10000s
(d index satisfied)
if Alpha ≥ 100mrad ⇒
otherwise = 10
6
/ L
B_real
(c index satisfied)
HD2402 - 31 - V1.4
if L
B_100
< 100 then t_lim > 10000s
(d index satisfied)
if 11mrad ≤ Alpha < 100mrad ⇒
otherwise t_lim = 10
6
/ L
B_real
(c index satisfied)
if L
B_100
< 100 then t_lim > 10000s
(d index satisfied)
if Alpha < 11mrad ⇒
otherwise t_lim = 10
6
/ L
B_11
• Side d1 [m] - Side d2 [m] – Distance R [m]:
o Alpha_1 [rad] angle subtended by the source along side d1 (see following table).
o Alpha_2 [rad] angle subtended by the source along side d2 (see following table).
Note: Alpha_1 and Alpha_2 values are those perceived by the visual system and
are calculated starting from α_1, α_2 angles calculated uniquely from geometric
parameters.
α_1, α_2 Alpha_1 Alpha_2
α_1≥100, α_1≥100 2 x Tan-1(d1/2R) 2 x Tan-1(d2/2R)
11≤α_1<100, α_2≥100 2 x Tan-1(d1/2R) 100mrad
11>α_1, α_2≥100 11mrad 100mrad
11>α_1, 11≤α_2<100 11mrad 2 x Tan-1(d2/2R)
11≤α_1<100, 11≤α_2<100 2 x Tan-1(d1/2R) 2 x Tan-1(d2/2R)
α_1≥100, 11≤α_2<100 100mrad 2 x Tan-1(d2/2R)
11>α_1, 11>α_2 11mrad 11mrad
11≤α_1<100, 11>α_2 2 x Tan-1(d1/2R) 11mrad
α_1≥100, 11>α_2 100mrad 11mrad
o Alpha [rad] average angle subtended by the source calculated as the average of
Alpha_1 e Alpha_2. This angle must be known to be able to calculate the real radiance perceived by human eye (CEI IEC 62471).
o Omega [sr] solid angle under which the rectangle is seen. Calculation can be per-
formed rigorously or approximately.
o L
B
(100mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 100mrad.
o L
B
(11mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 11mrad.
o L
B
(1.7mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 1.7mrad.
o L
B
(real) [W/(m² sr)] real radiance calculated starting from the entered geomet-
ric parameters.
HD2402 - 32 - V1.4
o t_lim [s] exposure time limit, that is the time period during which the source can
be observed with no problems to the visual system. This value is calculated with
the following procedure:
if L
B_real
< 100 then t_lim > 10000s
(d index satisfied)
if Alpha ≥ 100mrad ⇒
otherwise t_lim = 10
6
/ L
B_real
(c index satisfied)
if L
B_100
< 100 then t_lim > 10000s
(d index satisfied)
if 11mrad ≤ Alpha < 100mrad ⇒
otherwise t_lim = 10
6
/ L
B_real
(c index satisfied)
if L
B_100
< 100 then t_lim > 10000s
(d index satisfied)
if Alpha < 11mrad ⇒
otherwise t_lim = 10
6
/ L
B_11
• Diameter d [m] – Distance R [m]:
o Alpha [rad] angle subtended by the source.
o Omega [sr] solid angle subtended by the source.
o L
B
(100mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 100mrad.
o L
B
(11mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 11mrad.
o L
B
(1.7mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 1.7mrad.
o L
B
(real) [W/(m² sr)] real radiance calculated starting from the entered geomet-
ric parameters.
o t_lim [s]: exposure time limit, that is the time period during which the source
can be observed with no problems to the visual system. This value is calculated
with the following procedure:
if L
B_real
< 100 then t_lim > 10000s
(d index satisfied)
if Alpha ≥ 100mrad ⇒
otherwise t_lim = 10
6
/ L
B_real
(c index satisfied)
HD2402 - 33 - V1.4
if L
B_100
< 100 then t_lim > 10000s
(d index satisfied)
if 11mrad ≤ Alpha < 100mrad ⇒
otherwise t_lim = 10
6
/ L
B_real
(c index satisfied)
if L
B_100
< 100 then t_lim > 10000s
(d index satisfied)
If Alpha < 11mrad ⇒
otherwise t_lim = 10
6
/ L
B_11
The exposure time limit in seconds is displayed aside radiance values.
If the Include in Report box is selected, table data will be included in the final report.
6.4.6 Table g.h.i. 380-1400
Table g.h.i. 380-1400 displays the exposure limit L
R
for parameters “g”, “h”, “i”.
The limit varies with respect to source observation time and to angular dimensions;
consequently, different exposure limits correspond to different observation times and
dimensions. In particular:
L
R
= 2.8
•
107/Cα [W m-2 sr-1] for t > 10s (g limit)
L
R
= 5
•
107/(t
0.25
Cα) [W m-2 sr-1] for 10μs ≤ t ≤ 10s (h limit)
L
R
= 8.89
•
108/Cα [W m-2 sr-1] for t < 10μs (i limit)
C
α
is a coefficient that depends on α dimensions of the source; its value is:
C
α
= 1.7 for α ≤ 1.7mrad
C
α
= α for 1.7 ≤ α ≤ 100mrad
C
α
= 100 for α > 100mrad
The displayed values are:
• Er Irradiance value [W/m2] (corresponding to the instant value if a single sam-
ple is taken into consideration, and to the mean value if several samples are
taken into consideration).
• Alpha angle in degrees, it is the angle under which the analyzed source is seen.
HD2402 - 34 - V1.4
• Alpha angle in radiants, equal to the previous but expressed in radiants.
• Omega solid angle in steradians, it is the solid angle under which the analyzed
source is seen. This angle is used for the calculation of luminance.
This parameter is estimated based on the radiance value and not on irradiance; consequently, the more detailed are the entered geometric parameters, the more plentiful will be the data on limit value.
All possible cases are analyzed in the following.
• Geometric data not available:
o L
R
(100mrad) [W/(m² sr)] radiance calculated assuming that all the light comes
from a circular area whose angular dimension is 100mrad. This value is to be
compared with the three limit values.
o t_
lim100
[s] exposure time limit, that is the time period during which a source can
be observed without damages to the visual system. This value is calculated with
the following procedure (all radiance values are expressed in [W m
-2
sr-1]):
it is assumed that C
α
= 100
if L
R_100
< 2.8
•
105 ⇒ t_lim > 10s (g limit satisfied)
if 2.8
•
105 ≤ L
R_100
≤ 8.89
•
106 ⇒ t_lim = (5
•
105/L
R_100
)4 (h limit satisfied)
if L
R_100
< 8.89
•
106 ⇒ t_lim < 10μs (i limit)
o L
R
(1.7mrad) [W/(m² sr)] radiance calculated assuming that all light comes from
a circular area whose angular dimension is 1.7mrad. This value is to be compared with the three limit values.
o t_
lim1.7
[s] exposure limit time, that is the time period during which a source can
be observed without damages to the visual system. This value is calculated with
the following procedure (all radiance values are expressed in [W m
-2
sr-1]):
it is assumed that C
α
= 1.7
if L
R_1.7
≤ 1.65
•
107 ⇒ t_lim > 10s (g limit satisfied)
if 1.65
•
107 ≤ L
R_1.7
≤ 5.2
•
108 ⇒ t_lim = (2.94
•
107/L
R_1.7
)4 (h limit satisfied)
if L
R_1.7
> 5.2
•
108 ⇒ t_lim < 10μs (i limit)
• Alpha [rad] , the user supplies the angular dimension of the source in radiants.
o Alpha [rad] angle subtended by the source.
o Omega [sr] solid angle subtended by the source, calculated starting from Alpha
angle, assuming that the source shape is circular:
Omega = 2π(1-cos(Alpha/2))
o L
R
(100mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 100mrad.
o L
R
(1.7mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 1.7mrad.
HD2402 - 35 - V1.4
o LR (real) [W/(m² sr)] is the real radiance calculated starting from the entered
geometric parameters.
o t_lim [s] exposure time limit, that is the time period during which a source can
be observed without damages to the visual system. This value is calculated with
the following procedure (all radiance values are expressed in [W m
-2
sr-1]):
if Alpha > 100mrad it is assumed that C
α
= 100
if L
R_real
≤ 2.8
•
105 ⇒ t > 10s (g limit satisfied)
if 2.8
•
105 ≤ L
R_real
≤ 8.89
•
106 ⇒ t_lim = (5
•
105/L
R_real
)4 [s] (h limit satisfied)
if 8.89
•
106 ≤ L
R_real
⇒ t_lim < 10μs (i limit)
if 1.7mrad < Alpha < 100mrad it is assumed that C
α
= Alpha
if L
R_real
≤ 2.8
•
107/Alpha ⇒ t > 10s (g limit satisfied)
if 2.8
•
107/Alpha ≤ L
R_real
≤ 8.89
•
108/Alpha ⇒ t_lim = (5
•
107/(L
R_real
•
Alpha))4 [s]
(h limit satisfied)
if 8.89
•
108/Alpha ≤ L
R_real
⇒ t_lim < 10μs (i limit)
if Alpha < 1.7mrad it is assumed that C
α
= 1.7
if L
R_1.7
≤ 1.65
•
107 ⇒ t > 10s (g limit satisfied)
if 1.65
•
107 ≤ L
R_1.7
≤ 5.23
•
108 ⇒ t_lim = (2.94
•
107/(L
R_1.7
))4 [s] (h limit
satisfied)
if 5.23
•
108 ≤ L
R_1.7
⇒ t_lim < 10μs (i limit)
• Omega [sr] , the solid angle under which the source is seen by the instrument in
steradians is supplied by the user.
o Alpha [rad] angle subtended by the source calculated starting from Omega solid
angle assuming that the source shape is circular:
Alpha = 2(Cos
-1
(1-Omega/2π))
o Omega [sr] solid angle subtended by the source.
o L
R
(100mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 100mrad.
o L
R
(1.7mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 1.7mrad.
o L
R
(real) [W/(m² sr)] real radiance calculated starting from the entered geomet-
ric parameters.
o t_lim [s] exposure time limit, that is the time period during which a source can
be observed without damages to the visual system. This value is calculated with
the following procedure (all radiance values are expressed in [W m
-2
sr-1]):
if Alpha > 100mrad it is assumed that C
α
= 100
if L
R_real
≤ 2.8
•
105 ⇒ t > 10s (g limit satisfied)
if 2.8
•
105 ≤ L
R_real
≤ 8.89
•
106 ⇒ t_lim = (5
•
105/L
R_100
)
4
[s] (h limit satisfied)
if 8.89
•
106 ≤ L
r_real
⇒ t_lim < 10μs (i limit)
HD2402 - 36 - V1.4
if 1.7mrad <Alpha < 100mrad it is assumed that Cα = Alpha
if L
R_real
≤ 2.8
•
107/Alpha ⇒ t > 10s (g limit satisfied)
if 2.8
•
107/Alpha ≤ L
R_real
≤ 8.89
•
108/Alpha ⇒ t_lim = (5
•
107/(L
R_real
•
Alpha))
4
[s]
(h limit satisfied)
if 8.89
•
108/Alpha ≤ L
R_real
⇒ t_lim < 10μs (i limit)
if Alpha < 1.7mrad it is assumed that C
α
= 1.7
if L
R_1.7
≤ 1.65
•
107 ⇒ t > 10s (g limit satisfied)
if 1.65
•
107 ≤ L
R_1.7
≤ 5.23
•
108 ⇒ t_lim = (2.94
•
107/(L
R_1.7
))4 [s] (h limit satis-
fied)
if 5.23
•
108 ≤ L
R_1.7
⇒ t_lim < 10μs (i limit)
• Side d1 [m] - Side d2 [m] – Distance R [m]:
o Alpha_1 [rad] angle subtended by the source along side d1 (see following table).
o Alpha_2 [rad] angle subtended by the source along side d2 (see following table).
Note: Alpha_1 and Alpha_2 values are those perceived by the visual system and
are calculated starting from α_1, α_2 angles calculated uniquely from geometric
parameters.
α_1, α_2 Alpha_1 Alpha_2
α_1>100, α_2>100 2 x Tan-1(d1/2R) 2 x Tan-1(d2/2R)
1.7≤α_1≤100, α_2>100 2 x Tan-1(d1/2R) 100mrad
1.7>α_1, α_2>100 1.7mrad 100mrad
1.7>α_1, 11≤α_2<100 1.7mrad 2 x Tan-1(d2/2R)
1.7≤α_1<100, 1.7≤α_2≤100 2 x Tan-1(d1/2R) 2 x Tan-1(d2/2R)
α_1>100, 1.7≤α_2≤100 100mrad 2 x Tan-1(d2/2R)
1.7>α_1, 1.7>α_2 1.7mrad 1.7mrad
1.7<α_1<100, 1.7>α_2 2 x Tan-1(d1/2R) 1.7mrad
α_1>100, 11>α_2 100mrad 1.7mrad
o Alpha [rad] average angle subtended by the source calculated as the average of
Alpha_1 e Alpha_2. This angle must be known to be able to calculate the real radiance perceived by human eye (CEI IEC 62471).
o Omega [sr] solid angle under which the rectangle is seen. Calculation can be per-
formed rigorously or approximately.
o L
B
(100mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 100mrad.
o L
R
(1.7mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 1.7mrad.
o L
R
(real) [W/(m² sr)] real radiance calculated starting from the entered geomet-
ric parameters.
o t_lim [s] exposure time limit, that is the time period during which a source can
be observed without damages to the visual system. This value is calculated with
the following procedure:
HD2402 - 37 - V1.4
if Alpha > 100mrad it is assumed that Cα = 100
if L
R_real
≤ 2.8
•
105 ⇒ t > 10s (g limit satisfied)
if 2.8
•
105 ≤ L
R_real
≤ 8.89
•
106 ⇒ t_lim = (5
•
105/L
R_100
)4 [s] (h limit satisfied)
if 8.89
•
106 ≤ L
R_real
⇒ t_lim < 10μs (i limit)
if 1.7mrad ≤ Alpha < 100mrad it is assumed that C
α
= Alpha
if L
R_real
≤ 2.8
•
107/Alpha ⇒ t > 10s (g limit satisfied)
if 2.8
•
107/Alpha ≤ L
R_real
≤ 8.89
•
108/Alpha ⇒ t_lim = (5
•
107/(L
R_real
•
Alpha))
4
[s]
(h limit satisfied)
if 8.89
•
108/Alpha ≤ L
R_real
⇒ t_lim < 10μs (i limit )
• Diameter d [m] – Distance R [m]:
o Alpha [rad] angle subtended by the source.
o Omega [sr] solid angle subtended by the source.
o L
R
(100mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 100mrad.
o L
R
(1.7mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 1.7mrad.
o L
R
(real) [W/(m² sr)] real radiance calculated starting from the entered geomet-
ric parameters.
o t_lim [s] exposure time limit, that is the time period during which a source can
be observed without damages to the visual system. This value is calculated with
the following procedure:
if Alpha > 100mrad it is assumed that C
α
= 100
if L
R_real
≤ 2.8
•
105 ⇒ t > 10s (g limit satisfied)
if 2.8
•
105 ≤ L
R_real
≤ 8.89
•
106 ⇒ t_lim = (5
•
105/L
R_100
)
4
[s] (h limit satisfied)
if 8.89
•
106 ≤ L
R_real
⇒ t_lim < 10μs (i limite)
if 1.7mrad < Alpha < 100mrad it is assumed that C
α
= Alpha
if L
R_real
≤ 2.8
•
107/Alpha ⇒ t > 10s (g limit satisfied)
if 2.8
•
107/Alpha ≤ L
R_real
≤ 8.89
•
108/Alpha ⇒ t_lim = (5
•
107/(L
R_real
•
Alpha))
4
[s]
(h limit satisfied)
if 8.89
•
108/Alpha ≤ L
R_real
⇒ t_lim < 10μs (i limit)
if Alpha < 1.7mrad it is assumed that C
α
= 1.7
if L
R_1.7
≤ 1.65
•
107 ⇒ t > 10s (g limit satisfied)
if 1.65
•
107 ≤ L
R_1.7
≤ 5.23
•
108 ⇒ t_lim = (2.94
•
107/(L
R_1.7
))4 [s] (h limit satis-
fied)
if 5.23
•
108 ≤ L
R_1.7
⇒ t_lim < 10μs (i limit)
The exposure limit time in seconds is displayed aside radiance values.
If the Include in Report box is selected, table data will be included in the final report.
HD2402 - 38 - V1.4
6.4.7 Table j.k.l. 780-1400
Table j.k.l. 780-1400 shows L
R
exposure limit for parameters “j”, “k”, “l”.
The limit varies according to source observation time and to angular dimensions; consequently, different exposure limits correspond to different observation times and dimensions. In particular:
L
R
= 6.6
•
106/Cα [W m-2 sr-1] for t > 10s (j limit)
L
R
= 5
•
107/(t
0.25
Cα) [W m-2 sr-1] for 10μs ≤ t ≤ 10s (k limit)
L
R
= 8.89
•
108/Cα [W m-2 sr-1] for t < 10μs (l limit)
C
α
is a coefficient that depends from source α dimensions; its value is:
C
α
= 11 for α ≤ 11mrad
C
α
= α for 11 ≤ α ≤ 100mrad
C
α
= 100 for α > 100mrad
The displayed values are:
• Irradiance value E
r
[W/m2] (corresponds to the instant value if a single sample
is considered, or to the mean value if several samples are considered).
• Alpha angle in degrees, it is the angle under which the analyzed source is seen.
• Alpha angle in radiants, equal to the previous angle, but expressed in radiants.
• Omega solid angle in steradians, a solid angle under which the analyzed source
is seen. This angle is used for the calculation of luminance.
This parameter is estimated based on the radiance value and not on that of irradiance, so the more detailed are the entered geometric parameters, the more plentiful
will be the data on limit value.
All possible cases are analyzed in the following.
• Geometric data not available:
o L
r
(100mrad) [W/(m² sr)] radiance calculated assuming that all the light comes
from a circular area whose angular dimension is 100mrad. This value is to be
compared with the three limit values.
o t_
lim100
[s] exposure limit time, that is the time period during which a source can
be observed without damages to the visual system. This value is calculated with
the following procedure (all radiance values are expressed in [W m
-2
sr-1]):
HD2402 - 39 - V1.4
it is assumed that Cα=100
if L
r_100
< 6
•
104 ⇒ t_lim > 10s (j limit satisfied)
if 2.8
•
105 ≤ L
r_100
≤ 8.89
•
106 ⇒ t_lim = (5
•
105/L
r_100
)4 (k limit satisfied)
if L
r_100
< 8.89
•
106 ⇒ t_lim < 10μs (l limit)
o L
r
(11mrad) [W/(m² sr)] radiance calculated assuming that all the light comes
from a circular area whose angular dimension is 11mrad. This value is to be
compared with the three limit values.
o t_
lim11
[s] exposure limit time, that is the time period during which a source can
be observed without damages to the visual system. This value is calculated with
the following procedure (all radiance values are expressed in [W m
-2
sr-1]):
it is assumed that C
α
= 11
if L
R_11
≤ 5.45
•
105 ⇒ t_lim > 10s (j limit satisfied)
if 5.45
•
105 ≤ L
R_11
≤ 8.08
•
107 ⇒ t_lim = (4.54
•
106/L
R_11
)4 (k limit satisfied)
if L
R_11
> 8.08
•
107 ⇒ t_lim < 10μs (l limit)
• Alpha [rad] , angular dimension of the source in radiants supplied by the user.
o Alpha [rad] angle subtended by the source.
o Omega [sr] solid angle subtended by the source, calculated starting from Alpha
angle, assuming that the source shape is circular:
Omega = 2π(1-cos(Alpha/2)
o L
R
(100mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 100mrad.
o L
R
(11mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 11mrad.
o L
R
(real) [W/(m² sr)] is the real radiance calculated starting from the entered
geometric parameters.
o t_lim [s] exposure limit time, that is the time period during which a source can
be observed without damages to the visual system. This value is calculated with
the following procedure (all radiance values are expressed in [W m
-2
sr-1]):
if Alpha > 100mrad it is assumed that C
α
= 100
if L
R_real
≤ 6
•
104 ⇒ t > 10s (j limit satisfied)
if 6
•
104 ≤ L
R_real
≤ 8.89
•
106 ⇒ t_lim = (5
•
105/L
R_real
)4 [s] (k limit satisfied)
if 8.89
•
106 ≤ L
R_real
⇒ t_lim < 10μs (l limit)
if 11mrad < Alpha < 100mrad it is assumed that C
α
= Alpha
if L
R_real
≤ 6
•
106/Alpha ⇒ t > 10s (j limit satisfied)
if 6
•
106/Alpha ≤ L
R_real
≤ 8.89
•
108/Alpha ⇒ t_lim = (5
•
107/(L
R_real
•
Alpha))4 [s]
(k limit satisfied)
if 8.89
•
108/Alpha ≤ L
R_real
⇒ t_lim < 10μs (l limit)
HD2402 - 40 - V1.4
if Alpha < 11mrad it is assumed that Cα = 11
if L
R_11
≤ 5.45
•
105 ⇒ t > 10s (j limit satisfied)
if 5.45
•
105 ≤ L
R_11
≤ 8.08
•
107 ⇒ t_lim = (4.54
•
106/(L
R_11
))4 [s] (k limit satis-
fied)
if 8.08
•
107 ≤ L
R_real
⇒ t_lim < 10μs (limite l)
• Omega [sr], the solid angle under which the source is seen by the instrument in
steradians is supplied by the user.
o Alpha [rad] angle subtended by the source calculated starting from Omega solid
angle assuming that the source shape is circular:
Alpha = 2(Cos
-1
(1-Omega/2π))
o Omega [sr] solid angle subtended by the source.
o L
R
(100mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 100mrad.
o L
R
(11mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 11mrad.
o L
R
(real) [W/(m² sr)] real radiance calculated starting from the entered geomet-
ric parameters.
o t_lim [s] exposure limit time, that is the time period during which a source can
be observed without damages to the visual system. This value is calculated with
the following procedure (all radiance values are expressed in [W m
-2
sr-1]):
if Alpha > 100mrad it is assumed that C
α
= 100
if L
R_real
≤ 6
•
104 ⇒ t > 10s (j limit satisfied)
if 6
•
104 ≤ L
R_real
≤ 8.89
•
106 ⇒ t_lim = (5
•
105/L
R_real
)4 [s] (k limit satisfied)
if 8.89
•
106 ≤ L
R_real
⇒ t_lim < 10μs (l limit)
if 11mrad < Alpha < 100mrad it is assumed that Cα = Alpha
if L
R_real
≤ 6
•
106/Alpha ⇒ t > 10s (j limit satisfied)
if 6
•
106/Alpha ≤ L
R_real
≤ 8.89
•
108/Alpha ⇒ t_lim = (5
•
107/(L
R_real
•
Alpha))4 [s]
(k limit satisfied)
if 8.89
•
108/Alpha ≤ L
R_real
⇒ t_lim < 10μs (l limit)
if Alpha < 11mrad it is assumed that Cα = 11
if L
R_11
≤ 5.45
•
105 ⇒ t > 10s (j limit satisfied)
if 5.45
•
105 ≤ L
R_11
≤ 8.08
•
107 ⇒ t_lim = (4.54
•
106/(L
R_11
))4 [s] (k limit satis-
fied)
if 8.08
•
107 ≤ L
R_real
⇒ t_lim < 10μs (l limit)
• Side d1 [m] - Side d2 [m] – Distance R [m]:
o Alpha_1 [rad] angle subtended by the source along side d1 (see following table).
o Alpha_2 [rad] angle subtended by the source along side d2 (see following table).
HD2402 - 41 - V1.4
Note: Alpha_1 and Alpha_2 values are those perceived by the visual system and
are calculated starting from α_1, α_2 angles calculated uniquely from geometric parameters.
α_1, α_2 Alpha_1 Alpha_2
α_1>100, α_1>100 2 x Tan-1(d1/2R) 2 x Tan-1(d2/2R)
11≤α_1≤100, α_2>100 2 x Tan-1(d1/2R) 100mrad
11>α_1, α_2>100 11mrad 100mrad
11>α_1, 11≤α_2≤100 11mrad 2 x Tan-1(d2/2R)
11≤α_1≤100, 11≤α_2≤100 2 x Tan-1(d1/2R) 2 x Tan-1(d2/2R)
α_1>100, 11<α_2<100 100mrad 2 x Tan-1(d2/2R)
11>α_1, 11>α_2 11mrad 11mrad
11<α_1<100, 11>α_2 2 x Tan-1(d1/2R) 11mrad
α_1>100, 11>α_2 100mrad 11mrad
o Alpha [rad] average angle subtended by the source calculated as the average of
Alpha_1 e Alpha_2. This angle must be known to be able to calculate the real radiance perceived by human eye (CEI IEC 62471).
o Omega [sr] solid angle under which the rectangle is seen. Calculation can be per-
formed rigorously or approximately.
o L
B
(100mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 100mrad.
o L
R
(11mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 11mrad.
o L
R
(real) [W/(m² sr)] real radiance calculated starting from the entered geomet-
ric parameters.
o t_lim [s] exposure time limit, that is the time period during which a source can
be observed without damages to the visual system. This value is calculated with
the following procedure:
if Alpha > 100mrad it is assumed that C
α
= 100
if L
R_real
≤ 6
•
104 ⇒ t > 10s (j limit satisfied)
if 6
•
104 ≤ L
R_real
≤ 8.89
•
106 ⇒ t_lim = (5
•
105/L
R_real
)4 [s] (k limit satisfied)
if 8.89
•
106 ≤ L
R_real
⇒ t_lim < 10μs (l limit)
if 11mrad < Alpha < 100mrad it is assumed that Cα = Alpha
if L
R_real
≤ 6
•
106/Alpha ⇒ t > 10s (j limit satisfied)
if 6
•
106/Alpha ≤ L
R_real
≤ 8.89
•
108/Alpha ⇒ t_lim = (5
•
107/(L
R_real
•
Alpha))4 [s]
(k limit satisfied)
if 8.89
•
108/Alpha ≤ L
R_real
⇒ t_lim < 10μs (l limit)
• Diameter d [m] – Distance R [m]:
o Alpha [rad] angle subtended by the source.
o Omega [sr] solid angle subtended by the source.
o L
R
(100mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 100mrad.
HD2402 - 42 - V1.4
o LR (11mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 11mrad.
o L
R
(real) [W/(m² sr)] real radiance calculated starting from the entered geomet-
ric parameters.
o t_lim [s] exposure time limit, that is the time period during which a source can
be observed without damages to the visual system. This value is calculated with
the following procedure:
if Alpha > 100mrad it is assumed that C
α
= 100
if L
R_real
≤ 6
•
104 ⇒ t > 10s (j limit satisfied)
if 6
•
104 ≤ L
R_real
≤ 8.89
•
106 ⇒ t_lim = (5
•
105/L
R_real
)4 [s] (k limit satisfied)
if 8.89
•
106 ≤ L
R_real
⇒ t_lim < 10μs (l limit)
if 11mrad < Alpha < 100mrad it is assumed that Cα = Alpha
if L
R_real
≤ 6
•
106/Alpha ⇒ t > 10s (j limit satisfied)
if 6
•
106/Alpha ≤ L
R_real
≤ 8.89
•
108/Alpha ⇒ t_lim = (5
•
107/(L
R_real
•
Alpha))4 [s]
(k limit satisfied)
if 8.89
•
108/Alpha ≤ L
R_real
⇒ t_lim < 10μs (l limit)
if Alpha < 11mrad it is assumed that Cα = 11
if L
R_11
≤ 5.45
•
105 ⇒ t > 10s (j limit satisfied)
if 5.45
•
105 ≤ L
R_11
≤ 8.08
•
107 ⇒ t_lim = (4.54
•
106/(L
R_11
))4 [s] (k limit satis-
fied)
if 8.08
•
107 ≤ L
R_real
⇒ t_lim < 10μs (l limit)
The exposure limit time in seconds is displayed aside radiance values.
If the Include in Report box is selected, table data will be included in the final report.
HD2402 - 43 - V1.4
6.4.8 Table m.n.o. 380-3000
Table m.n.o. 380-3000 shows the exposure limits for parameters “m”, “n”, “o”.
The displayed values are:
• E
skin
[W/m2] irradiance value (corresponding to the instant value if a single
sample is taken into consideration, and to the mean value if several samples
are taken into consideration).
• H
skin
[J/m2] dose value regarding the samples taken into consideration.
• Exposure time limit (t_lim) for “o” index necessary for exceeding the threshold,
calculated with the following formula:
t_lim = 35600/E
skin
if the found time is > 10s
otherwise:
t_lim = (20000/ E
skin
)
4/3
• Exposure time limit (t_lim) for indexes “m” and “n”
Limits “m” and “n” should be calculated in the 780-3000 spectral interval. Since this
spectral range is not available in the instrument, the same channel of the “o” limit is
used; in this case, values will be greater than real values and consequently they will
be in favor of worker safety.
As to exposure times greater than 1000 seconds, the “n” limit is calculated:
if E
IR
≤ 100 W/m2 then the “n” limit is not satisfied;
if E
IR
> 100 W/m2 then the exposure time is calculated in order to return back with-
in “n” limit, in particular:
t_lim=(18000/ E
IR
)
4/3
If the Include in Report box is selected, the data in the table will be included in the final report.
HD2402 - 44 - V1.4
6.4.9 Notes table
The user can record at will any comments regarding each of the limits provided for in
attachment 37 of L.D. 81/08 in the Notes table.
6.4.10 Report table
The Report table sums up the exposure limit values for each risk index.
In the Assessment column, the risk index state is indicated by means of colored boxes
having the following significance:
White box = risk index not determined
Green box = risk index not exceeded
Yellow box = risk index with limited exposure time
Red box = risk index exceeded
HD2402 - 45 - V1.4
The following table describes the association between box color and exposure time for
the different indexes.
Exposure time (t_lim)
Risk
index
Green box Yellow box Red box
a t_lim > 8h - t_lim < 8h
b t_lim > 8h - t_lim < 8h
c t_lim > 10000s t_lim < 10000s d t_lim > 10000s - t_lim < 10000s
g t_lim > 10s - t_lim < 10s
h t_lim > 10s t_lim < 10s t_lim < 10μs
i t_lim > 10s t_lim < 10s -
j t_lim > 10s - t_lim < 10s
k t_lim > 10s t_lim < 10s t_lim < 10μs
l t_lim > 10s t_lim < 10s -
m t_lim > 1000s t_lim < 1000s -
n t_lim > 1000s - t_lim < 1000s
o t_lim > 10s t_lim < 10s -
Table 6: correspondence between evaluation of risk indexes and exposure
time
HD2402 - 46 - V1.4
7 SPECTRAL CHARACTERISTICS
Measurements of artificial optical radiations are conducted on a wide spectral interval
ranging within 180nm and 3000nm.
Different risk indexes are associated to different spectral intervals, depending on the
kind of damage produced by the optical radiation on the exposed parts of the human
body: eyes and skin.
The correct curves of the spectral response are obtained by summing up the signals
coming from several sensors with appropriate weighting.
7.1 SPECTRAL INTERVAL 180-400nm
This spectral interval must be evaluated with the weighting curve S(λ).
The following figure shows the comparison between the spectral response curve obtained by the combination of channels and weighting curve S(λ).
1.0E -06
1.0E -05
1.0E -04
1.0E -03
1.0E -02
1.0E -01
1.0E+00
200 220 240 260 280 300 320 340 360 380 400
Lambda(nm)
Figure 7:
comparison between spectral response curve obtained by the combination of channels (in purple color) and weighting curve S(λ) (in black)
HD2402 - 47 - V1.4
7.2 SPECTRAL INTERVAL 315-400nm (UVA)
No weighting is required by this spectral interval.
The following figure shows the spectral response curve of the UVA channel.
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
250 270 290 310 330 350 370 390 410 430 450
Lambda(nm)
Figure 8: spectral response curve of UVA sensor
7.3 SPECTRAL INTERVAL 300-700nm
This spectral interval must be evaluated with the weighting curve B(λ).
The following figure shows the comparison between the spectral response curve obtained by the combination of channels and weighting curve B(λ).
1.0E-05
1.0E-04
1.0E-03
1.0E-02
1.0E-01
1.0E+00
300 350 400 450 500 550 600 650 700
Lam bda(nm )
Figure 9:
comparison between spectral response curve obtained by the combination of channels (in purple color) and weighting curve B(λ) (in black)
HD2402 - 48 - V1.4
7.4 SPECTRAL INTERVAL 380-1400nm
This spectral interval must be evaluated with the weighting curve R(λ).
The following figure shows the comparison between the spectral response curve obtained by the combination of channels and weighting curve R(λ).
1.0E-03
1.0E-02
1.0E-01
1.0E+00
1.0E+01
350 450 5 50 650 750 850 950 1050 1150 1250
Lambda(nm)
Figure 10: comparison between spectral response curve obtained by the combi-
nation of channels (purple color) and weighting curve R(λ) (in black)
7.5 SPECTRAL INTERVAL 780-1400nm
This spectral interval must be evaluated with the weighting curve R(λ) (in the only
portion ranging from 780nm to 1400nm).
The following figure shows the comparison between the spectral response curve obtained by the combination of channel and weighting curve R(λ).
1.0E-03
1.0E-02
1.0E-01
1.0E+00
1.0E+01
500 600 700 800 900 1000 1100 1200 1300
Lambda(nm)
Figure 11:
comparison between spectral response curve obtained by the combination of channels (purple color) and weighting curve R(λ) (in black)
HD2402 - 49 - V1.4
7.6 SPECTRAL INTERVAL 380-3000nm
No weighting is required by this spectral interval.
The following figure shows the spectral response curve of the pyranometer.
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
100 1000 10000
Lam bda (nm )
400 3000
Figure 12: spectral response curve of the pyranometer.
HD2402 - 50 - V1.4
8 SENSOR CALIBRATION
Instruments are factory-calibrated and do not require any additional intervention by
users. Each sensor in the HD2402 is individually calibrated in different modes.
Luxmeter (Channel 6), calibration is performed by comparison to the second-line
reference luxmeter used at the Delta OHM metrological laboratory; the comparison is
performed through an incandescent lamp operating at a color temperature of 2856K
(illuminant A).
UV Radiometer (Channel 2), calibration is performed by comparison to the secondline reference radiometer used at the Delta OHM metrological laboratory; calibration is
performed with a 270nm monochromatic light obtained at the output of a double monochromator and using a Xe-Hg lamp as a source.
UVA Radiometer (Channel 5), calibration is performed by comparison to the second-line reference radiometer used at the Delta OHM metrological laboratory; calibration is performed with a 365nm monochromatic light obtained by applying a 365nm
interferential filter to a Xe-Hg lamp.
BLU Radiometer (Channel 7), calibration is performed by comparison to the second-line reference radiometer used at the Delta OHM metrological laboratory; calibration is performed with a 440nm monochromatic light obtained by applying a 440nm
interferential filter to a halogen lamp.
IR Radiometer (Channel 3), calibration is performed by comparison to the secondline reference radiometer used at the Delta OHM metrological laboratory; calibration is
performed with a 680nm monochromatic light obtained by applying a 680nm interferential filter to a halogen lamp.
Pyranometer (Channel 9), calibration is performed by comparison to the reference
pyranometer by using the light produced by a halogen lamp. Light is perpendicular to
the thermopile surface. Calibration is performed in compliance with ISO 9847 ("Calibration of field pyranometers by comparison to a reference pyranometer"), method
IIc.
It is recommended to check sensor calibration at least once per year.
HD2402 - 51 - V1.4
9 TECHNICAL SPECIFICATIONS
Instrument
Dimensions (L. x W. x H) 70x70x160 mm
75x75x160 mm with protection sleeve
Weight 500 g
Materials aluminum alloy
rubber protection sleeve
Operating conditions
Operating temperature -5 … 50°C
Storage temperature -25 … 65°C
Working relative humidity 0 … 85% RH non condensing
Power supply
Power adapter (code SWD05) 5Vdc/1A
Safety of stored data unlimited
Serial interface: output for connection to PC USB input
through CP24H cable
Memory capacity 96000 stored data, corresponding to
about 26 hours of continuous acquisi-
tion.
Storage interval fixed at 1 second.
MEASURENMENT RANGES
Measurement of illuminance in the spectral range 380÷780 nm
0 ÷ 399.9 lux
0 ÷ 3.999
•
103 lux
0 ÷ 39.99
•
103 lux
0 ÷ 399.9
•
103 lux
Measurement of irradiance UV in the spectral range 220÷400 nm with spectral
weighting factor S(λ)
0 ÷ 39.99
•
10-3 W/m2
0 ÷ 399.9
•
10-3 W/m2
0 ÷ 3.999 W/m
2
0 ÷ 39.99 W/m2
Measurement of ultraviolet irradiance in the spectral range UVA (315÷400 nm)
0 ÷ 3.999 W/m2
0 ÷ 39.99 W/m
2
0 ÷ 399.9
W/m2
0 ÷ 3.999
•
103 W/m2
HD2402 - 52 - V1.4
Measurement of irradiance in the spectral range 400÷700 nm (blue) with spectral
weighting factor B(
λ
)
0 ÷ 399.9
•
10-3 W/m2
0 ÷ 3.999 W/m2
0 ÷ 39.99 W/m
2
0 ÷ 399.9 W/m
2
Measurement of infrared irradiance, in the spectral range 700÷1300 nm, with spectral weighting factor R(λ)
0 ÷ 3.999 W/m2
0 ÷ 39.99 W/m2
0 ÷ 399.9 W/m
2
0 ÷ 3.999
•
103 W/m2
Measurement of infrared irradiance, in the spectral range 400÷2800 nm
0 ÷ 3.999
•
103 W/m2
HD2402 - 53 - V1.4
10 STORAGE
Instrument storage conditions:
• Temperature: -25...+70°C.
• Humidity: 10...90%RH non condensing.
• In storing, avoid places where:
Humidity is at high level.
The instrument is exposed to direct sunlight.
The instrument is exposed to a high temperature source.
There are strong vibrations.
The instrument is exposed to vapors, salt and/or corrosive gas.
11 SAFETY INSTRUCTIONS
General safety instructions
This instrument has been constructed and tested in compliance with EN61010-1:2010
safety regulation regarding electronic measuring instruments and left the factory in
perfect safety technical conditions.
The regular operation and operational safety of the instrument can be assured only if
all normal safety measures are observed, along with the specific measures described
in this instruction manual.
The regular operation and operational safety of the instrument can be assured only at
the climatic conditions specified in this manual.
Do not use the instrument in places where the following may occur:
• Rapid variations of ambient temperature that may cause condensation.
• Corrosive or inflammable gazes.
• Direct vibrations or shocks to the instrument.
• High-intensity electromagnetic fields, static electricity.
If the instrument is moved from a cold environment to a hot one and vice versa, the
formation of condensation may disturb the operation of the unit. In this case, wait till
the instrument temperature reaches the ambient temperature before operating the
unit.
User obligations
The user of the instrument shall make sure that the following rules and directives concerning hazardous materials are observed:
CE directives on safety at work
Local lows on safety at work
Accident-prevention regulations
HD2402 - 54 - V1.4
12 ORDER CODES
HD2402 Multi-sensor instrument, datalogger for the measurement of non-
coherent optical radiations. Provided with: CH20–ROA hardware
key for software enabling, CP24H connection cable, SWD05
power supply unit, VTRAP20 tripod, instruction manual, carrying
case and compliance report. DeltaLog13 software downloadable
from Delta OHM website is included.
Accessories:
CH20–ROA Hardware key for PCs with Windows® operating systems. If
connected to the USB port of a PC, enables the use of DeltaLog13 software with HD2402 instrument.
CP24H Connection cable to a PC or power supply, with M12 connector on
the instrument side and A-type USB connector on the PC/power
supply side.
SWD05 100-240Vac/5Vdc-1A power supply unit. Output with A-type
USB connector.
VTRAP20 Tripod to be attached to the instrument, maximum height 270 mm.
GUARANTEE
TERMS OF GUARANT EE
All DELTA OHM instruments are subject to accurate testing, and are guaranteed for 24 months from the
date of purchase. DELTA OHM will repair or replace free of charge the parts that, within the warranty
period, shall be deemed non efficient according to its own judgement. Complete replacement is excluded
and no damage claims are accepted. The DELTA OHM guarantee only covers instrument repair. The
guarantee is void in case of incidental breakage during transport, negligence, misuse, connection to a
different voltage than that required for the appliance by the operator. Finally, a product repaired or
tampered by unauthorized third parties is excluded from the guarantee. The instrument shall be returned
FREE OF SHIPMENT CHARGES to your dealer. The jurisdiction of Padua applies in any dispute.
The electrical and electronic equipment marked with this symbol cannot be disposed of in public
landfills. According to the Directive 2011/65/EU, the european users of electrical and electronic
equipment can return it to the dealer or manufacturer upon purchase of a new one. The illegal
disposal of electrical and electronic equipment is punished with an administrative fine.
This guarantee must be sent together with the instrument to our service centre.
IMPORTANT: Guarantee is valid only if coupon has been correctly filled in all details.
Instrument Code:
HD2402
Serial Number
RENEWALS
Date Date
Inspector Inspector
Date Date
Inspector Inspector
Date Date
Inspector Inspector
GHM GROUP – Delta OHM | Delta Ohm S.r.l. a socio unico
Via Marconi 5 | 35030 Caselle di Selvazzano | Padova | ITALY
Phone +39 049 8977150 | Fax +39 049 635596
www.deltaohm.com | info@deltaohm.com
The quality level of our instruments is the result of the constant development of the product. This may
produce some differences between the information written in this manual and the instrument you have
purchased. We cannot completely exclude the possibility of errors in the manual, for which we apologize.
The data, images and descriptions included in this manual cannot be legally asserted. We reserve the
right to make changes and corrections with no prior notice.
GHM GROUP – Delta OHM | Delta Ohm S.r.l. a socio unico
Via Marconi 5 | 35030 Caselle di Selvazzano | Padova | ITALY
Phone +39 049 8977150 | Fax +39 049 635596
www.deltaohm.com | info@deltaohm.com
V1.4
05/02/2019
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