Velleman DVM401 User manual

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DVM401 Rev. 02
01.07.2009 ©Velleman nv
2
re 1

01.07.2009
1. Int
To all r
e
Import
a
your dist
environ
m
If in do
u
Thank y
o
thorough
damage
d
Damage
covered
b
for any
e
This devi
humidity
professi
o
The sou
n
schools,
auditoriu
The light
automati
sensitive
Measure
semicon
d
Perform
semicon
d
The hum
humidity
/
roduction
e
sidents of th
e
a
nt environme
This symbol o
disposal of th
e
environment.
unsorted mu
n
company for
r
ributor or to a l
m
ental rules.
u
bt, contact y
o
o
u for choosing
t
ly before bringi
n
d
in transit, don'
t
caused by disr
e
b
y the warrant
y
e
nsuing defects
ce combines th
meter and te
m
o
nally and at ho
n
d level functio
n
offices, airport
s
ms, studios an
d
function is use
d
cally compensa
component is
a
temperatures
u
d
uctor or the K
-
relative humidi
t
d
uctor.
idity and temp
e
/
semiconducto
r
DVM40
1
3
USER MA
N
e
European Un
ntal informati
n the device or
e
device after i
t
Do not dispose
n
icipal waste; it
r
ecycling.
T
his
d
ocal recycling s
o
ur local wast
e
t
he Velleman! Pl
n
g this device in
t
install or use i
t
e
gard of certain
y
and the deale
r
or problems.
e functions of s
m
perature mete
r
me.
n
can be used t
o
s
, etc. and to ch
d
hi-fi installati
o
d
to measure l
u
tes for the angl
a
very stable lo
n
u
sing the built-i
n
-
type thermoco
u
t
y measuremen
t
e
rature measuri
r
sensor and K-
t
1
N
UAL
ion
on about this
the package in
t
s lifecycle coul
d
of the unit (or
should be take
n
d
evice should b
e
ervice. Respect
e
disposal au
t
ease read the
m
to service. If th
e
t
and contact yo
guidelines in t
h
r
will not accep
t
ound level met
e
r
and can be us
e
o
measure soun
eck the acousti
o
ns.
u
minous intensi
t
e of incidence.
n
g-life diode.
n
temperature-
s
u
ple.
t
s with the buil
t
ng function is f
o
t
ype thermocou
Rev.
0
©Velleman
product
dicates that
d
harm the
batteries) as
n
to a specializ
e
e
returned to
the local
t
horities.
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anual
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device was
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responsibility
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DVM401 Rev. 02
01.07.2009 ©Velleman nv
4
2. Features
•the device measures sound levels, luminous intensity, temperature
and humidity
•the 3 1/2–digit LCD displays the following units: Lux, °C, %RH, C &
dB and A & dB
•low-battery indication
•luminous intensity from 0.01 to 20000Lux
•sound level range (resolution 0.1dB)
A-weighting LO (low) : 35 – 100dB
A-weighting HI (high) : 65 – 130dB
C-weighting LO (low) : 35 – 100dB
C-weighting HI (high) : 65 – 130dB
•humidity measurements from 25 to 95%RH, fast response and
resolution 0.1%RH
•temperature measuring levels from –20°C to +750°C / -4°F to
+1400°F
3. Overview
Refer to the illustration on page 2 of this manual.
1. LCD display: 3 ½-digit LCD. Displays a wide variety of units (Lux, x
10 Lux, °C, °F, %RH, dB, A, C, Lo, Hi) and also gives ‘BAT’, ‘MAX
HOLD’ and ‘DATA HOLD’ indications.
2. Power button: activates or deactivates the device
3. Select button: Used to select function and range
4. MAX HOLD: Press this button to hold the maximum reading. Press
again to release the reading and continue your measurements.
5. DATA HOLD: Press the HOLD button to hold a particular reading
and press it again to continue your measurements.
6. Function switch: Select temperature, humidity, sound level and
luminous intensity with this switch.
7. Microphone: built-in electret condenser microphone
8. Photo detector: long-life silicon photo diode is built in
9. Sensor for humidity measurements is built-in
10.Temperature terminal: insert the temperature probe in this
terminal

DVM401 Rev. 02
01.07.2009 ©Velleman nv
5
4. Operation
a) Measuring Sound Levels
1. Place the function switch in the dB position.
2. Hold the microphone at a horizontal angle to the source to be
measured.
3. Press the SELECT button to select A & dB, C & dB, Lo & dB or Hi &
dB.
4. Both the A- and C-weighting curves have a frequency range
between 30Hz and 10kHz.
5. The fast response is ideal to measure short bursts of sound and
peak values.
6. The sound level is displayed.
Note: strong winds (> 10m/sec.) can influence your measurements.
Use the included windscreen when this happens.
b) Measuring Light Levels
1. Place the function switch in the LUX-position
2. Hold the detector at a horizontal angle to the source to be
measured.
3. Press SELECT to select the range: 20, 200, 2000, 20000Lux.
4. Read the nominal value from the display.
5. The overrange indication (“1”) is displayed if the input signal
exceeds the range limit. Select a higher range.
6. Remove the photo detector from the light source when the
measurement is completed.
7. The spectral sensitivity of this device is very similar to the CIE curve
(International Commission on Illumination) depicted below:
relative sensitivity spectral sensitivity
wavelength (Nm)

DVM401 Rev. 02
01.07.2009 ©Velleman nv
6
8. Recommended illumination: see table below.
At the Office
conference room, reception area 200 – 750
clerical wor
k
700 – 1500
typing 1000 – 2000
In a Factory
packing wor
k
150 – 300
production lines 300 – 750
inspection wor
k
750 – 1500
electronic parts assembly line 1500 – 3000
In a Hotel
public room, cloakroom 100 – 200
reception 200 – 1000
Store
staircase 150 – 200
show window 750 - 1500
front of show window 1500 – 3000
Hospital
sick room, warehouse 100 - 200
operating room 300 – 750
School
auditorium, gymnasium 100 – 300
classroom 200 – 750
library, laboratory 500 - 1500
c) Measuring Humidity
1. Place the function switch in the %RH position.
2. Read the measured value from the LCD.
3. The device needs a couple of minutes to catch up when the relative
humidity of the tested area changes.
d) Temperature Measurements
1. Place the function switch in the TEMP position.
2. Press the SELECT button to select 0.1°C or 1°C and 1°F or 0.1°F.
3. Read the measured value from the display.
4. Insert the K-type thermocouple in the appropriate socket.

DVM401 Rev. 02
01.07.2009 ©Velleman nv
7
5. Touch the target surface with the extremity of the temperature
sensor and read the measured temperatures from the LCD.
Attention: Be careful when the range selector is positioned on one of
the following ranges: 0.1°C, 1°C, 0.1°F or 1°F. Do not
attempt to make voltage measurements while the test leads
are connected with the K-type thermocouple socket.
Ignoring this warning may lead to personal injury or
damage to the device.
5. Maintenance
The battery should be replaced when “BAT” appears on the display.
Open the battery compartment, replace the old battery (1 x 9V-battery
type 6F22 or equivalent) and close the compartment again.
6. Technical specifications
Display 1999 counts and the following
indications: dB, A & dB, C & dB, Lo &
dB, Hi & dB, MAX HOLD, DATA HOLD
indication
Polarity automatic negative polarity indication
Overrange Indication “OL”
Low-Battery Indication “BAT” is displayed when the battery’s
voltage drops below the operating
level
Measurement Rate 1.5 measurements per second,
nominal.
Storage Temperature -10°C to 60°C (14°F to 140°F)
Auto Power Off after ± 10 minutes of inactivity
Power Source one 9V-battery (e.g. 6F22)
Dimensions 251 x 63.8 x 40 (H x W x D)
Dimensions Photo detector 115 x 60 x 27mm

DVM401 Rev. 02
01.07.2009 ©Velleman nv
8
SOUND
Sound Level Measurement Range
A-weighting LO (low): 35 – 100dB
A-weighting HI (high): 65 – 130dB
C-weighting LO (low): 35 – 100dB
C-weighting HI (high): 65 – 130dB
resolution 0.1dB
Typical Frequency Range 30Hz to 10KHz
Frequency Weighting A- & C-weighting
Time Weighting fast
Maximum Hold max. value does not change if the
increase in volume < 1.5dB / 3 min.
Accuracy ±3.5dB at 94dB, 1KHz sine wave
Microphone electret condenser microphone
LIGHT
Measuring Range 20, 200, 2000, 20000Lux (20000Lux
reading x 10)
Overrange Indication “1”
Accuracy ±5% of reading + 10 digits (calibrated
with standard incandescence lamp at a
colour temperature of 2856K)
Thermal sensitivity ±0.1°C
Photo detector silicon photo diode with filter
HUMIDITY/TEMPERATURE
Humidity Measurement Range 25 to 95%RH
Temperature Range -20°C to +50°C (-4°F to +122°F) with
built-in temperature sensor
-20 to +200°C (-4°F to +200°F) for
low range
-20 to +750°C (-4°F to +1400°F) for
high range
Resolution 0.1%RH, 0.1°C/0.1°F low range,
1°C/1°F high range
Accuracy (after calibration)
Humidity ±5%RH (at 25°C, 35 to 95%RH)
Humidity Sensor Response Time ±6 min.
Temperature ±3% rdg ±2°C (from –20°C to
+200°C)

DVM401 Rev. 02
01.07.2009 ©Velleman nv
9
±3.5% rdg ±2°C (from –20°C to
+750°C)
±3% rdg ±2°F (from –4°F to +200°F)
±3.5% rdg ± 2°F (from –4°F to
+1400°F)
Input Protection 60V DC or 24V AC rms
Use this device with original accessories only. Velleman nv
cannot be held responsible in the event of damage or injury
resulted from (incorrect) use of this device. For more info
concerning this product, please visit our website
www.velleman.eu. The information in this manual is subject to
change without prior notice.
© COPYRIGHT NOTICE
This manual is copyrighted. The copyright to this manual is
owned by Velleman nv. All worldwide rights reserved. No part of
this manual may be copied, reproduced, translated or reduced to any
electronic medium or otherwise without the prior written consent of
the copyright holder.

01.07.2009
1. Inl
e
Aan all
e
Belangr
een loka
a
milieuwe
Hebt u
v
betreff
e
Dank u
v
toestel i
n
transpor
t
geldt nie
t
deze ha
n
voor def
e
Dit multi
f
die van
d
U kunt h
e
Gebruik
h
luchthav
e
auditoriu
Het toes
t
te mete
n
van het l
met lang
Meet te
m
halfgelei
d
Meet de
v
Geb
e
iding
e
ingezetenen
v
ijke milieu-in
f
Dit symbool
o
als het na zij
n
schade kan t
o
eventuele ba
t
afval; het m
o
voor recycla
g
a
l recyclagepun
tgeving.
v
ragen, conta
c
e
nde de verwij
v
oor uw aankoo
p
n
gebruik neem
t
t
, installeer het
t
voor schade d
n
dleiding en uw
e
cten of proble
m
f
unctionele toe
s
d
ecibelmeter, li
c
e
t zowel thuis
a
h
et toestel als
d
e
n, enz. U kunt
ms, studio’s en
t
el is geschikt a
n
. Het toestel h
o
icht. De lichtge
v
e levensduur.
m
peraturen dan
k
d
er of via het K
-
v
ochtigheidsgr
a
DVM40
1
10
ruikersha
v
an de Europ
e
f
ormatie betr
e
o
p het toestel o
f
n
levenscyclus
w
o
ebrengen aan
t
terijen) niet bi
j
o
et bij een gesp
e
g
e. U moet dit t
o
t brengen. Res
p
c
teer dan de p
dering.
p
! Lees deze h
a
t
. Werd het toe
s
dan niet en ra
a
oor het negere
n
deale
r
zal de v
e
m
en die hier re
c
s
tel combineert
c
htmeter, vocht
a
ls op het werk
g
d
ecibelmeter op
er ook de ako
e
hifi-installaties
ls lichtmeter o
m
o
udt automatis
c
v
oelige compo
n
k
zij de ingebou
w
-
type thermok
o
a
ad met de ing
e
1
ndleiding
e
se Unie
e
ffende dit pr
o
f
de verpakking
w
ordt weggewo
het milieu. Goo
j
het gewone h
u
e
cialiseerd bed
r
o
estel naar uw
v
p
ecteer de plaa
t
laatselijke au
t
a
ndleiding gron
d
s
tel beschadigd
a
dpleeg uw deal
n
van bepaalde
e
rantwoordelijk
c
htstreeks verb
a
vier verschillen
igheidsmeter e
n
g
ebruiken.
school, op kan
e
stische eigensc
mee testen.
m
de heersende
c
h rekening me
t
n
ent is een zeer
w
de temperatu
u
o
ppel.
e
bouwde halfgel
Rev.
0
©Velleman
o
duct
geeft aan dat,
rpen, dit toeste
i dit toestel (en
u
ishoudelijke
r
ijf terechtkom
e
v
erdeler of naa
r
t
selijke
t
oriteiten
d
ig voor u het
tijdens het
er. De garantie
richtlijnen in
heid afwijzen
a
nd mee houde
n
de functies nl.
n
thermometer.
toor, op de
happen van
lichtintensiteit
t
de invalshoek
stabiele diode
u
rgevoelige
eider.
0
2
nv
l
e
n
r
n
.