■ Sonomètre
■ Sound Level Meter
■ Schallpegelmesser
■ Analizzatore di rumori
■ Sonometro
C.A
832
FRANÇAIS
ENGLISH
DEUTSCH
ITALIANO
ESPANOL
Notice de fonctionnement
User's manual
Bedienungsanleitung
Libretto d’Istruzioni
Manual de Instrucciones
1
Meaning of the symbol
Caution! Please refer to the user’s manual before using the instrument.
In this manual, the instructions preceded by the above symbol, should
they not be carried out as shown, can result in a physical accident or
damage the instrument or the installations.
Definition of CAT III
This instrument included in overvoltage category III complies with the
stringent reliability and availability requirements corresponding to fixed
industrial and domestic installations.
(see CEI 664-1 Ed. 92)
Thank you for purchasing this CA 832 Sound Level Meter.
To get the best service from this instrument:
■ Read the user’s manual carefully
■ Respect the safety precautions detailed
WARRANTY
Our guarantee is applicable for twelve months after the date on which the
equipment is made available (extract from our General Conditions of Sale,
available on request).
CONTENTS
1. PRESENTATION ..................................................................... 11
2. PRECAUTIONS FOR USE ...................................................... 11
2.1Precautions for sensor
use.......................................................................................11
2.2 Remarks on measurement condi-
tions...................................................................11
3. DESCRIPTION OF THE INSTRUMENT .................................. 12
4. UTILISATION ........................................................................... 13
4.1Procedure...........................................................................................................13
4.2 Utilisation of the auxiliary output and the assembly screw for the photo stand........14
4.3 Calibration of the sound level
meter.........................................................................14
5. GENERAL CHARACTERISTICS ............................................ 15
6. MAINTENANCE ...................................................................... 16
7. TO ORDER .............................................................................. 16
8. APPENDIX.......................................................................17
10
1. PRESENTATION
The CA832 digital sound level meter is designed to assess sound
ambiences or nuisances in accordance with imperatives of safety and
legislation in force.
It complies with standard CEI 651.
The professional and domestic applications are numerous: measuring the
sound levels in factories, schools, offices, airports, studios, auditoriums…
The CA 832 is a portable, compact instrument with a 2000 point display
operable in one hand and may be fitted on a photographer’s type tripod for
long duration measurements.
The CA 832 is used to measure sound levels from 35 to 130 dB in 3
ranges: 35-80 dB, 50-100 dB, 80-130 dB.
It features 2 weighting curves A and C for measurement integrating the
sensitivity of the human ear according to sound frequency. Curve A is the
general-purpose curve in an industrial environment, and C is more suited
in presence of low frequency sounds. Also, mode ‘F’ (fast response time)
corresponds to the response time of the ear. Mode ‘S’ (slow response
time) will be used to obtain a uniform reading when the sound signal level
shows fluctuations.
2. PRECAUTIONS FOR USE
2.1 Precautions for sensor use
It is recommended to read these instructions before any use of the
instrument.
• The sound level meter is a measurement instrument that must be
protected from strong impacts and vibrations.
• The microphone in particular must be protected from exposure to
water and dust and must not be stored in humid and/or excessively
hot areas.
•Do not remove the foam cover of the sound level meter. Also,
cleaning the microphone is not recommended.
2.2 Remarks on measurement conditions
1.Background noise
If the difference of level between the absence and the presence of noise
to be measured is 10dB or more, the influence of background noise on the
measurement may be considered negligible.
If the difference is lower at this level, a compensation correction (see table
below) must be applied to the measurement performed to integrate the
background noise:
Level
difference
(dB)
Compensa-
tion
value (dB)
4
-2.2
5
-1.7
678
-1.3 -1 -0.8
11
910
-0.7 0
2. Parasitic reflections
The microphone must be positioned far from any sound reflective surfaces
such as walls or the ground, so as to minimise errors due to possible
parasitic reflections.
When taking measurements, hold the sound level meter at arm’s length,
to avoid any reflections due to your own body and also to enable free
propagation of sound in all directions.
3. Take the necessary steps so that no obstacle is between the
measurement point and the noise source.
Disregard the extremely low readings (insignificant sound) or conversely
4.
those at the top of the scale (overload).
3. DESCRIPTION OF THE INSTRUMENT
➀➀
➀
➀➀
➁➁
➁ Backlit liquid crystal digital display.
➁➁
Measuring head including the microphone, protected by a foam cap.
- Main display : digital value of sound level expressed in dB over
3 ½ digits or OL error code (overload).
- Display symbols :
MAX maximum value of the measurement
Battery discharged
Ffast time compensation
Sslow time compensation
Aweighting curve type A
Cweighting curve type C
If one of these 2 arrows is displayed continuously, this
means that you are not in the appropriate measurement
range : use the RANGE push button to move to the
adequate range.
35-80dB, 50-100dB, 80-130dB measurement range in use.
OL indicates overload of the measuring instrument.
➂➂
➂ 2-function push button :
➂➂
Short press : Backlight ON/OFF.
Long press (>2 seconds) : choice of frequency weighting
➃➃
➃ push button for measurerement range change.
➃➃
➄➄
➄ push button for activation/deactivation of MAX function.
➄➄
RANGE
MAX
A or C.
12
➅➅
11
➅ 3-position centre switch :
➅➅
F
S
OFF Unit OFF.
OFF
S Long response time measurement (use for
fluctuating noise level measurements)
FFast response time measurement (most
common operating mode).
.
➆➆
➆ Protective cap for the tester calibration screw.
➆➆
➇➇
➇ Screwdriver to be used for calibration of the sound
➇➇
➈➈
➈ 'Jack' connector for recording using an external system.
➈➈
➉➉
➉
➉➉
11
CAL
level meter.
Assembly screw for photo tripod.
Femal type output for use with 'Jack' connector.
4. UTILISATION
4.1 Procedure
1. Selection of measurement range
The sound level meter features 3 measurement ranges each having a
dynamic range of 55 dB:
Low noise range level: 35 to 80 dB
Medium noise range level: 50 to 100 dB
High noise range level: 80 to 130 dB
When noise measurement is active, the measurement is repeated more
than 2 times per second.
If the
that the measurement range you are in is too high or too low. In this case,
press the RANGE button until you return to the adequate measurement
range.
or arrows are shown continuously on the display, this means
2. Choice of frequency weighting
Since the ear does not have the same hearing sensitivity for all frequencies,
filters are used which weight or correct the measurement levels according
to frequency.
Tw o correction curves A and C are on the CA832. To switch from one to
the other a long press is needed ( > 2 seconds ) on the push button
The most common is weighting curve A corresponding to the “average
international ear”. It is usually used for the measurement of nuisance
levels in industrial areas.
Curve C is more suited for verification of the presence of low frequency
noise (if the measurement level on position C is higher than on position A
, this means that the signal contains significant low frequency components).
This curve is well suited for the measurement of musical environments.
.
13
3. Choice of response time.
Depending on the nature of the noise under consideration (brief noises
such as a horn or an animal cry or prolonged noise such as industrial
machinery), we must choose an adequate measurement response time.
Tw o response times are available on the CA832:
F (short response time filter) if the noise is made up of brief pulses or if
only the peak values interest you. It is the most commonly used.
S (long response time filter) to measure a medium sound level.
The 3-position centre switch is used to cut from one to the other.
4. Practical measurement conditions :
Hold the instrument in the hand and direct the microphone towards the
source of noise to be measured (see precautions for use); the sound level
will be displayed.
5. MAX Mode : press the MAX push button to display the maximum
sound level during the measurement period.
6. Switch off the instrument (position OFF) after use.
4.2 Utilisation of the auxiliary output and of the
assembly screw for photo stand.
• Utilisation of analogue output.
The CA 832 sound level meter possesses a physical output capable of
supplying an AC or DC signal proportional to the sound level in dB, usable
via external long running recording equipment for example.
AC output: supplies approximately 1 Vrms at maximum of the scale used.
DC output: supplies 10 mV/dB
Utilisation of the ‘Jack’ connector: solder the ‘common’, ‘AC signal, DC
signal’ wires onto the ‘Jack’ male connector. Insert the latter in to the female
connector located at the bottom of the sound level meter casing.
• Mounting the sound level meter onto a photo tripod
For long-duration measurements, the sound level meter can be mounted
on a tripod (not included). To do so install the assembly screw (10) for the
tripod at the rear of the sound level meter.
Install the tripod.
4.3 Calibration of the sound level meter
Calibrate the instrument before its use, in particular if you have not
performed any measurements for a long period. To do so, use the sound
level meter CA 833 calibrator.
The procedure is as follows:
1. Switch on the sound level meter. Select the high measurement range
80-130 dB , on curve ‘C’ and on temporal filter ‘F’
2. Remove the foam protection of the microphone, then insert the
microphone into the female part of the calibrator until it stops. Set the
assembly on a flat surface, not subject to vibrations.
14
3. Switch on the calibrator that emits a 94-dB sound at a frequency of
1000 Hz.
4. Remove the protective cap ‘CAL’ of the adjusting screw.
5. Adjust the display of the sound level meter to 94 dB using the
screwdriver supplied with the instrument.
5. GENERAL CARACTERISTICS
• Compliance with standards : IEC 651 *
ANSI S1.4
JIS C 1502
•Type of microphone: capacitor microphone
• Sensor calibration: calibrated at factory using a source
at 0.2%
•Measuring and dynamic range:
In 3 ranges (dynamic 55 dB ) from 0 to 130 dB:
Low Range: 35-80 dB
Medium Range: 50-100 dB
High Range: 80-130 dB
•Periodicity of measurement: 2.5 times per second, rated
•Measurement before time-based and frequency processing:
rms value not frequency- weighted
• Resolution: 0.1dB
•Precision: + - 2.0 dB
•Frequency dynamic range: from 31.5 Hz to 8000 Hz
•Frequency weighting: curves A and C as per IEC651
•Time weighting: S (slow) and F (fast) as per IEC651
•Auxiliary output:
AC:1.0 Vrms , impedance 600 ohms
DC: 10mV/dB , impedance 50 ohms
•Temperature drift: < 0.5 dB (-10°C to 50°C)
•Humidity drift: < 0.5 dB pour 30% < R.H. < 90%
(at
40°C and 1000 Hz )
• Conditions of calibration:
Frequency Reference: 1000 Hz
Sound level reference: 94 dB
Te mperature reference: 20°C
Humidity reference: 65 %
Measurement range reference: 80-130dB
Incidence direction reference: frontal
•Environment:
- Utilisation: 0 to 50°C ( 32 to 122°F ) at <80 %
humidity, without condensation
- Storage: -20 to +60°C (-4 to +140°F ) and
from 0 to 80 RH, without battery.
•Power: 9V battery (type 6LR61 or 6F22 )
•Dimensions/weight: 237 x 60.5 x 38 mm / 230 g with
battery.
•Electromagnetic Compatibility:
Ed .1992
• Sealing: IP44 as per CEI 60259 (Ed. 89), the
Emission as per EN 50081-1 Ed.1992
Immunity as per EN 50082-1
instrument must be fitted with its
protective sheath.
* For frequencies lower than 100 Hz, the difference between two
measuring range can be higher than 0.7 dB.
15
6. MAINTENANCE
For maintenance, use only specified spare parts. The manufacturer cannot
be held responsible for any accident following a repair performed
independently of its customer support department or authorised servicing
centres.
6.1 Maintenance
6.1.1 Battery replacement
• Set the switch to OFF
• Remove the cover from the rear of the unit.
• Replace the dead battery by a 9V (type 6LR61 ou 6LF22).
6.2 Cleaning the casing
Clean the casing using a cloth slightly soaked with soapy water. Rinse
using a humid cloth.
Do not use solvents.
6.3 Metrological Checks
It is essential that all measuring instruments are regularly
calibrated.
For checking and calibration of your instrument, please contact
our accredited laboratories (list on request) or the Chauvin
Arnoux subsidiary or Agent in your country.
6.4 Repairs
Repairs under or out of guarantee: please return the product to
your distributor.
7. TO ORDER
C.A 832…………………………………………...........………..P01.1855.01Z
Delivered with shockproof sheath, protective foam microphone cap,
screwdriver, male Jack connector, assembly screw for photo stand, 9V
battery and this operator’s manual.
Spares:
9V battery………………………………….......……….........…..P01. 1007.32
Accessory:
Calibrator for sound level meter C.A 833..………………....…P01. 1853. 01
16
8. APPENDIX
17
Bedeutung des Zeichens
ACHTUNG! Lesen Sie die Bedienungsanleitung, bevor Sie das Gerät
benutzen.
Werden die Anweisungen in dieser Bedienungsanleitung, denen dieses
Symbol vorangestellt ist, nicht beachtet oder eingehalten, kann es zu
Verletzungen von Menschen oder Beschädigungen des Geräts oder
der Installationen kommen.
Definition von CAT III
Dieses Gerät der Überspannungskategorie III entspricht den strengen
Zuverlässigkeits- und Verfügbarkeitsanforderungen für feste Industrieund Hausinstallationen (siehe IEC 664-1, Ausg. 92).
Wir danken Ihnen für das Vertrauen, dass Sie uns mit dem Kauf dieses
Schallpegelmessers C.A 832 entgegengebracht haben.
Damit die optimale Nutzung des Geräts gewährleistet ist:
■ lesen diese Bedienungsanleitung sorgfältig durch,
■ beachten Sie die Sicherheitshinweise.
GARANTIE
Unsere Garantie erstreckt sich, falls nicht ausdrücklich anders vereinbart,
über zwölf Monate nach Kauf des Geräts (ein Auszug aus unseren
allgemeinen Verkaufsbedingungen ist auf Anforderung erhältlich).
INHALT
1. VORSTELLUNG................................................................19
2. SICHERHEITSHINWEISE...................................................19
2.1 Sicherheitshinweise für den Fühler.........................................................................19
2.2 Hinweise zu den Messbedingungen........................................................................19
3. BESCHREIBUNG DES GERÄTS...............................................20
4. BENUTZUNG....................................................................21
4.1Verfahren.............................................................................................................21
4.2
Verwendung des Hilfsausgangs und der Befestigungsschraube für ein Fotostativ.................................22
4.3 Kalibrierung des Schallpegelmessers....................................................................22
5. ALLGEMEINE DATEN.............................................................23
6. WARTUNG.......................................................................24
7. BESTELLANGABEN..........................................................24
8. ANLAGE..........................................................................25
18
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