Presentation; Precautions For Use; Precautions For Sensor Use; Remarks On Measurement Conditions - Chauvin Arnoux C.A 832 Manual De Instrucciones

The C.A 832 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 IEC 651.
The professional and domestic applications are numerous: measuring the sound
levels in factories, schools, offices, airports, studios, auditoriums...
The C.A 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 C.A 832 is used to measure sound levels from 37 to 130 dB in 3 ranges:
37-80 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 micro-
phone 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)
Compensation value (dB)
2. Parasitics 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.

1. PRESENTATION

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