Delta OHM HD2402 User manual



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INTRODUCTION..................................................................................... 5
2RADIOMETRY OVERVIEW....................................................................... 8
2.1Irradiance..........................................................................................8
2.2Radiance ...........................................................................................9
3OPERATING PRINCIPLE ........................................................................11
4INSTALLATION OF THE INSTRUMENT....................................................15
4.1Connection to a PC............................................................................ 15
5DESCRIPTION OF OPERATION ..............................................................16
6MANAGEMENT OF A MEASUREMENT CAMPAIGN WITH DELTALOG13.......18
6.1Setting measurement scales ............................................................... 18
6.2Logging mode .................................................................................. 19
6.3Download of the measurements stored in the PC.................................... 20
6.4Data analysis and evaluation report ..................................................... 21
6.4.1Geometrical parameters ........................................................... 25
6.4.2Luxmeter table ....................................................................... 26
6.4.3Table a. 180-400..................................................................... 27
6.4.4Table b. 315-400..................................................................... 27
6.4.5Table c.d. 300-700 .................................................................. 28
6.4.6Table g.h.i. 380-1400............................................................... 33
6.4.7Table j.k.l. 780-1400 ............................................................... 38
6.4.8Table m.n.o. 380-3000............................................................. 43
6.4.9Notes table............................................................................. 44
6.4.10Report table ........................................................................... 44
7SPECTRAL CHARACTERISTICS...............................................................46
7.1Spectral interval 180-400nm .............................................................. 46
7.2Spectral interval 315-400nm (UVA) ..................................................... 47
7.3Spectral interval 300-700nm .............................................................. 47
7.4Spectral interval 380-1400nm............................................................. 48
7.5Spectral interval 780-1400nm............................................................. 48
7.6Spectral interval 380-3000nm............................................................. 49
8SENSOR CALIBRATION .........................................................................50
9TECHNICAL SPECIFICATIONS ...............................................................51
10STORAGE .............................................................................................53
11SAFETY INSTRUCTIONS........................................................................53
12ORDER CODES ......................................................................................54

HD2402 - 5 - V1.4
1INTRODUCTION
HD2402 is a portable datalogger photo-radiometer for the measurement of non-
coherent optical radiations in accordance with 2006/25/CE European direc-
tive 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 artifi-
cial 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 bio-
physically-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)
L
B
= L
λ
(λ) .B(λ) .dλ
λ= 700 nm
λ= 300 nm
∫
(L
B
is 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
..
=
(E
B
is only relevant in the range 300 to 700 nm)
(g) to (l)
L
R
= L
λ
Rd
λ
.
(λ)
λ
2
λ
1
∫
.
(λ)
(See Table 1.1 for appropriate values of λ
1
and λ
2
)
(m), (n)
∫⋅=
=λ
=λ
λ
nm3000
nm780
IR
dλ)(λEE
(E
IR
is only relevant in the range 780 to 3 000 nm)
(o)
∫∫ ⋅⋅=
=λ
=λ
λ
t
0
nm3000
nm380
skin dtdλ)t,(λEH
(H
skin
is only relevant in the range 380 to 3 000 nm)
Table 1: formulas for the calculation of limit values
Where :
Eλ(λ,t),
Eλ
Spectral irradiance or spectral power density: the radiant power incident per
unit area upon a surface, expressed in watts per square meter per nanome-
ter [W/(m2nm)]; El(λ,t) and Eλvalues come from measurements or can be
supplied by the manufacturer of the equipment;
Eeff Effective irradiance: calculated irradiance within the UV wavelength range
180 to 400 nm, spectrally weighted by S (λ),
ex
p
ressed in watts
p
er s
q
uare
meter [W/m2];
H Radiant exposure: the time integral of the irradiance, ex
p
ressed in
j
oule
p
er
square meter [J/m2];
Heff Effective radiant exposure: spectral weighting by S (λ) radiant exposure,
expressed in joule per square meter [J/m2];
EUVA Total irradiance (UVA): calculated irradiance within the UVA wavelength
range 315 to 400 nm, expressed in watts per square meter [W/m2];
HUVA Radiant exposure: the time and wavelength integral
or sum of the irradiance
within the UVA wavelength range 315 to 400 nm, ex
p
ressed in
j
oule
p
er
square meter [J/m2];
S (λ) Spectral weighting taking into account the wavelength de
p
endence of the
health effects of UV radiation on eye and skin [dimensionless];
t, Δt Time, duration of the exposure, expressed in seconds [s];
λWavelength, expressed in nanometers [nm];
Δλ Bandwidth, expressed in nanometers [nm], of calculation or measurement
intervals;
Lλ(λ),
Lλ
Spectral radiance of the source, expressed in watts per square meter
p
er
steradian per nanometer [W/(m2sr nm)];

HD2402 - 7 - V1.4
R (λ) Spectral weighting taking into account the wavelength de
p
endence of the
thermal injury caused to the eye by visible and IRA radiation [dimen-
sionless];
LREffective radiance
(
thermal in
j
ur
y)
: calculated radiance s
p
ectrall
y
wei
g
hted
by R(λ), expressed in watts per square meter per steradian per nanometer
[W/(m2sr)];
B (λ) Spectral weighting taking into account the wavelength de
p
endence of the
photochemical injury caused to the eye by the blue light radiation [dimen-
sionless];
LBEffective radiance (blue light): calculated radiance spectrally weighted by B
(λ), expressed in watts per square meter per steradian [W/(m2sr)];
EBEffective irradiance (blue light): calculated irradiance spectrally weighted b
y
B (λ), expressed in watts per square meter [W/m2];
EIR Total irradiance (thermal injury): calculated irradiance within the infrared
wavelength range 780 nm to 3 000 nm, expressed in watts per square me-
ter [W/m2];
Eskin 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];
Hskin Radiant ex
p
osure, the time and wavelen
g
th inte
g
ral or sum of the irradiance
within the visible and infrared wavelength range 380 nm to 3 000 nm, ex-
pressed in joule per square meter [J/m2];
αAngular subtense: the angle subtended by an apparent source, as observed
at a point in space, expressed in milliradians (mrad).
A
pp
arent 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/m2], radiance [W/(m2sr)]) differ
depending on the kind of injury to be taken into consideration.

HD2402 - 8 - V1.4
2RADIOMETRY 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 in-
strument for the calculation of the various radiometric quantities requested by L.D. No
81/08.
2.1 IRRADIANCE
Irradiance Ei 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
Ei
i
Φ
=
dA
d


Figure 1: irradiance
The irradiance measurement unit is [W/m2]; when calculated at different wavelengths,
we have spectral irradiance [W/(m2 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 per-
pendicular to the surface and decreases with the incident angle according to the
cosine formula (Law of Cosine):
)cos(
0_
θ
⋅
=
ii EE
where:
Eiis the irradiance on the surface taken into consideration,
Ei—0 is the irradiance when the surface is perpendicular to the flux,
θis 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 uni-
formly in all directions (isotrope), the irradiance produced on a surface decreases
with the square of the distance.
d
Φ
i

HD2402 - 9 - V1.4
2.2 RADIANCE
Radiance L
iat 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
Li
2
Figure 2: radiance
The radiance measurement unit is [W/(m2sr)]; when calculated at different wave-
lengths, we obtain the spectral radiance [W/(m2nm sr)].
A solid angle is the angle subtended at a point Pby 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 R2. 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 pri-
mary 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
iL⋅== ∫
Ω
ωθ )cos(
Where F depends only on geometry.
In these particular conditions, the radiance value can be obtained from that of the ir-
radiance: hence, the formula will be:
F
E
Li
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 illumi-
nance (lux) and radiance by luminance [cd/m2].
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
3OPERATING PRINCIPLE
6 sensors are used for the measurement of optic radiations. Each sensor covers a giv-
en 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 out-
lined 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 indi-
cator 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 cor-
responding spectral weighting curve (V[λ], S[λ], B[λ], R[λ]), implemented through the
use of appropriate filters.
Channel Measure quantity Spectral range and corre-
sponding 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 sensitiv-
ity 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 ac-
quired 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 val-
ue 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 •103 39.99 •103399.9 •103
2 W/m2 39.99 •10-3 399.9 •10-3 3.999 39.99
5 W/m2 3.999 39.99 399.9 3.999 •103
7 W/m2 399.9 •10-3 3.999 39.99 399.9
3 W/m2 3.999 39.99 399.9 3.999 •103
9 W/m2 3.999 •103
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
Lambda (nm)
Ponderazione
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)
Heff =30
Daily value 8 hours
[J m-2] eye cornea
conjunctiva
lens
skin
photokeratitis
conjunctivitis
cataractogenesis
erythema
elastosis
skin cancer
b. 315-400
(UVA)
HUVA =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
LB:[W m-2 sr-1]
t: [seconds]
for α≥11 mrad
eye retina photoretinitis
d. 300-700
(Blue light)
see note 1
LB=100
for t > 10 000 s
[W m-2 sr-1]
e. 300-700
(Blue light)
see note 1
E
B
¼
100
t
for t ≤10 000 s
EB:[Wm
-2]
t: [seconds]
for α< 11 mrad
see note 2
f. 300-700
(Blue light)
see note 1
EB= 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-2 sr-1]C
α= 1,7 for
α≤1,7 mrad
Cα=αfor
1,7 ≤α≤100 mrad
Cα= 100 for
α> 100 mrad
λ1= 380; λ2= 1 400 eye retina retinal burn
h. 380-1 400
(Visible and IRA) L
R
¼
5·10
7
C
α
t
0,25
for 10 μs≤t≤10 s
LR:[W m-2 sr-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-2 sr-1]
j. 780-1 400
(IRA) L
R
¼
6·10
6
C
α
fort>10s
[W m-2 sr-1]C
α=11for
α≤11 mrad
Cα=αfor
11≤α≤100 mrad
Cα= 100 for
α> 100 mrad
(measurement field-of-view:
11 mrad)
λ1= 780; λ2= 1 400
eye retina retinal burn
k. 780-1 400
(IRA) L
R
¼
5·10
7
C
α
t
0,25
for 10 μs≤t≤10 s
LR:[Wm
-2 sr-1]
t: [seconds]
l. 780-1 400
(IRA) L
R
¼
8,89 · 10
8
C
α
for t < 10 μs
[W m-2 sr-1]
m. 780-3 000
(IRA and IRB)
EIR = 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)
EIR =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 coin-
cide with the spectral response of the utilized sensors, while other sensors need to
properly combine several channels. The table shows how HD2402 channels are com-
bined to obtain 13 of the requested 15 limits. Limits e, f are beyond the measure-
ments achievable with the instrument and, on the other hand, are applied to particu-
lar 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 cto 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), pro-
vided 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 esti-
mate the requested quantities.

HD2402 - 15 - V1.4
4INSTALLATION OF THE INSTRUMENT
The instrument is provided with a single cable (cod. CP24H), ending with a M12 con-
nector at the instrument side and an A-type USB connector at the other end. The ca-
ble is used both for connection to the external SWD05 power supply unit and for con-
nection 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 re-
charged 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 sta-
bility 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, da-
ta transfer, graphic display and print of acquired or stored measurements can be ma-
naged 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 con-
nected to the PC, Windows® operating system automatically recognizes the instru-
ment as an HID (Human Interface Device) device and uses the drivers already in-
cluded in the operating system.

HD2402 - 16 - V1.4
5DESCRIPTION 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 prop-
erly 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, pa-
ragraph 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 prede-
fined folder (preset in C:\DL13_HD2402 but user changeable).

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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:
oStart time and duration of a programmed logging;
oFull scale of the measurement range for each channel of the instrument;
oInternal clock;
oIdentification 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:
Logging 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.
Logging 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.

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6MANAGEMENT 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 meas-
urement 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 Delta-
Log13 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 meas-
urement scale and current scale, that is the scale in use at the moment of the last ac-
quisition.
The preset scale is in light blue color. All scales are factory preset to AUTO (auto-
matic). Scales for each channel can be set manually, by mouse-clicking on the desired
scale (the smallest bar indicates the full sensitivity scale).

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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 re-
main active even if the instrument is subsequently disconnected.
If a channel measurement is beyond full scale, the corresponding indicator in the col-
umn 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 mem-
ory 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 dur-
ing 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 Moni-
tor 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 ma-
nually. 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

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(hh:mm:ss). Select the Apply key to save the instrument settings, logging will auto-
matically 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 ac-
quisition 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 down-
loaded 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.