Velleman DVM401 User manual
DVM401
3 ½-DIGIT 4-IN-1 DMM
3 ½-DIGITS DIGITALE METER 4-IN-1
MULTIMÈTRE 4-EN-1 3 ½ DIGITS
MULTÍMETRO DIGITAL DE 3 ½ DÍGITOS 4 EN 1
3 ½-STELLIGES DIGITALMULTIMETER 4-IN-1
MULTIMETR CYFROWY „4-W-1” - 3 ½ CYFRY
USER MANUAL 4
GEBRUIKERSHANDLEIDING 11
NOTICE D’EMPLOI 18
MANUAL DEL USUARIO 25
BEDIENUNGSANLEITUNG 32
INSTRUKCJA OBSŁUGI
DVM401 Rev. 2
9. 1.2 14 ©Velleman nv
3
re 1
DVM401 Rev. 2
9. 1.2 14 ©Velleman nv
4
USER MANUAL
1 Introduction
To all residents of the European Union
Important environmental information about this product
This symbol on the device or the package indicates that
disposal of the device after its lifecycle could harm the
environment. Do not dispose of the unit (or batteries) as
unsorted municipal waste; it should be taken to a specialized
company for recycling. This device should be returned to
your distributor or to a local recycling service. Respect the local
environmental rules.
If in doubt, contact your local waste disposal authorities
Thank you for choosing the Velleman! Please read the manual
thoroughly before bringing this device into service. If the device was
damaged in transit, don't install or use it and contact your dealer.
Damage caused by disregard of certain guidelines in this manual is not
covered by the warranty and the dealer will not accept responsibility
for any ensuing defects or problems.
This device combines the functions of sound level meter, light meter,
humidity meter and temperature meter and can be used both
professionally and at home.
The sound level function can be used to measure sound levels in
schools, offices, airports, etc. and to check the acoustics of
auditoriums, studios and hi-fi installations.
The light function is used to measure luminous intensity. The device
automatically compensates for the angle of incidence. The light-
sensitive component is a very stable long-life diode.
Measure temperatures using the built-in temperature-sensitive
semiconductor or the K-type thermocouple.
Perform relative humidity measurements with the built-in
semiconductor.
The humidity and temperature measuring function is for use a
humidity/semiconductor sensor and K-type thermocouple.
DVM401 Rev. 2
9. 1.2 14 ©Velleman nv
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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 . 1 to 2 Lux
•sound level range (resolution .1dB)
A-weighting LO (low) : 35 – 1 dB
A-weighting HI (high) : 65 – 13 dB
C-weighting LO (low) : 35 – 1 dB
C-weighting HI (high) : 65 – 13 dB
•humidity measurements from 25 to 95%RH, fast response and
resolution .1%RH
•temperature measuring levels from –2 °C to +75 °C / -4°F to
+14 °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
1 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
1 .Temperature terminal: insert the temperature probe in this
terminal
DVM401 Rev. 2
9. 1.2 14 ©Velleman nv
6
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 3 Hz and 1 kHz.
5. The fast response is ideal to measure short bursts of sound and
peak values.
6. The sound level is displayed.
Note: strong winds (> 1 m/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: 2 , 2 , 2 , 2 Lux.
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
w
avelength (Nm)
DVM401 Rev. 2
9. 1.2 14 ©Velleman nv
7
8. Recommended illumination: see table below.
At the Office
conference room, reception area
2
–
75
clerical work
7
–
15
typing
1
–
2
In a Factory
packing work
15
–
3
production lines
3
–
75
inspection work
75
–
15
electronic parts assembly line
15
–
3
In a Hotel
public room, cloakroom
1
–
2
reception
2
–
1
Store
staircase
15
–
2
show window
75
-
15
front of show window
15
–
3
Hospital
sick room, warehouse
1
-
2
operating
room
3
–
75
School
auditorium, gymnasium
1
–
3
classroom
2
–
75
library, laboratory
5
-
15
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 .1°C or 1°C and 1°F or .1°F.
3. Read the measured value from the display.
4. Insert the K-type thermocouple in the appropriate socket.
DVM401 Rev. 2
9. 1.2 14 ©Velleman nv
8
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: .1°C, 1°C, .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 -1 °C to 6 °C (14°F to 14 °F)
Auto Power Off after ± 1 minutes of inactivity
Power Source one 9V-battery (e.g. 6F22)
Dimensions 251 x 63.8 x 4 (H x W x D)
Dimensions Photo detector 115 x 6 x 27mm
DVM401 Rev. 2
9. 1.2 14 ©Velleman nv
9
SOUND
Sound Level Measurement Range
A-weighting LO (low): 35 – 1 dB
A-weighting HI (high): 65 – 13 dB
C-weighting LO (low): 35 – 1 dB
C-weighting HI (high): 65 – 13 dB
resolution .1dB
Typical Frequency Range 3 Hz to 1 KHz
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 2 , 2 , 2 , 2 Lux (2 Lux
reading x 1 )
Overrange Indication “1”
Accuracy ±5% of reading + 1 digits (calibrated
with standard incandescence lamp at a
colour temperature of 2856K)
Thermal sensitivity ± .1°C
Photo detector silicon photo diode with filter
HUMIDITY/TEMPERATURE
Humidity Measurement Range 25 to 95%RH
Temperature Range -2 °C to +5 °C (-4°F to +122°F) with
built-in temperature sensor
-2 to +2 °C (-4°F to +2 °F) for
low range
-2 to +75 °C (-4°F to +14 °F) for
high range
Resolution .1%RH, .1°C/ .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 –2 °C to
+2 °C)
DVM401 Rev. 2
9. 1.2 14 ©Velleman nv
1
±3.5% rdg ±2°C (from –2 °C to
+75 °C)
±3% rdg ±2°F (from –4°F to +2 °F)
±3.5% rdg ± 2°F (from –4°F to
+14 °F)
Input Protection 6 V 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.
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