Presentation; Precautions For Use; Precautions Use; Tions - Chauvin Arnoux C.A 832 Notice De Fonctionnement

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:
4
Level
d i f f e r e n c e
( d B )
-2.2
Compensa-
tion
value (dB)

1. PRESENTATION

5 6
-1.3
-1.7
11
7 8
-1 -0.8
9 10
-0.7 0