Utilisation Of The Auxiliary Output And Of The Assembly Screw For Photo Stand; Calibration Of The Sound Level Meter - Chauvin Arnoux C.A 832 Notice De Fonctionnement

4.2. UTILISATION OF THE AUXILIARY OUTPUT AND OF THE
ASSEMBLY SCREW FOR PHOTO STAND
Utilisation of analogue output :
The C.A 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 on to 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 C.A 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.
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 sup-
plied with the instrument.
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