MultiTest-Master
11
GB
Reference values for illuminance in outdoor spaces
Practical example Luminous intensity in lux
Sunshine 50,000 – 100,000
Overcast 2000 – 10,000
Good street lighting 20
Full moon 0.01 – 0.1
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 speciÖ 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 Ö tted with Ö 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
the case of scientiÖ c measurements, for example.
After switching on the device, press the „dB“ button. To switch
between dB (A) and dB (C), press the „Unit“ button. Point the
microphone towards the relevant sound source and observe the
relevant distance. By pressing the „Mode“ button, you can get the
device to display the highest (MAX), lowest (MIN), average (AVG)
or difference value (DIF) in addition to the current measured value.
As its name suggests, the „HOLD“ button enables you to hold the
current measured value.
Sound pressure level (dB)
8
SET
HOLD
MODEMODE
dB
TEMP/%RH
UNIT
ANEMO
LUX
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 Sound pressure level in dB (A)
Auditory threshold 0
Quiet residential area 30 to 40
Low-level conversation, quiet ofÖ ce 40 to 50
Normal conversation 50 to 60
Heavy road trafÖ c 70 to 80
Shouting, screaming 80 to 85
Pneumatic hammer (10 m away) 90 to 100
Start-up of a jet aircraft (100 m away) 120 to 130
Pain threshold 140
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