LaserLiner SoundTest-Master Mode D'emploi page 9

3
Setting date/time (setup)
The current data and time should be set before using the
device for the first time to ensure stored measured values
are assigned for subsequent evaluation. Press and hold
the "MAX" button while switching on. You can change
the value with the "LEVEL" buttons and move to the next
value with the "MAX" button.
Date format: Year/month/day. Switch off the device to
store the setting.
4
Sound pressure level (dB)
This device registers sound in a similar way to the human ear. The
integrated microphone receives the incoming sound waves and
converts them into electrical signals. Human hearing involves speci c
auditory curves. The greater the sound pressure, the louder the
sound is perceived to be. The higher the frequency, the higher the
pitch of the sound is perceived to be. To ensure that measurements
are aurally compensated, this measuring device is tted with lters.
The A-weighting (dB A) replicates the frequency response associated
with human hearing and is used for the majority of industrial noise
and environmental noise measurements.
The C-weighting is used in industrial measurements.
After switching on the device, correspondingly switch over the dB A/
dB C weighting lter by pressing the "A/C" button.
!
Powerful wind noises (> 10m/s) can affect the measured value. In such cases, you should use the
wind de ector supplied with the product.
Sound source
Auditory threshold
Quiet residential area
Low-level conversation, quiet of ce
Normal conversation
Heavy road traf c
Shouting, screaming
Pneumatic hammer (10 m away)
Start-up of a jet aircraft (100 m away)
Pain threshold
SoundTest-Master
Sound pressure level in dB (A)
0
30 to 40
40 to 50
50 to 60
70 to 80
80 to 85
90 to 100
120 to 130
140
GB 09