Operating The Sound Level Meter; Measurement Range Selection; Frequency Weighting Options - AEMC Instruments CA832 Notice De Fonctionnement

4.2

Operating the Sound Level Meter

4.2.1

Measurement Range Selection

The sound level meter features three measurement ranges, each having
a dynamic range of 50dB.
1. Low noise range: 37 to 80dB
2. Medium noise range: 50 to 100dB
3. High noise range: 80 to 130dB
When noise measurement is active, the measurement is repeated more
than two times per second.
If the or symbols are shown continuously on the display, the current
measurement range is too high or low. Press the RANGE button to return
to the adequate measurement range.
4.2.2

Frequency Weighting Options

The ear does not have the same hearing sensitivity for all frequencies.
The CA832 uses filters, which weight or correct the measurement levels
according to frequency.
The two correction curves available on the CA832 are:
Curve A: This is the most common weighting curve, corresponding to the
"average international ear". It is usually used for the measurement of nui-
sance levels in industrial areas.
Curve C: This curve is more suited for verification of the presence of low
frequency noise. This curve is well suited for the measurement of musical
environments.
NOTE: If the measurement level on position C is higher than on position A,
the signal contains significant low frequency components.
To switch from one curve to the other, a long press (>2 sec) is needed on
the button.
Sound Level Meter Model CA832
11