4. MEASURING PROCEDURE
4-1 Sound Pressure Measurements (SPL)
In SPL mode the display shows readings of
the sound pressure level.
1) Power ON the meter by pressing and holding the " Power
Button " ( 3-2, Fig. 1 )for at least 1.5 seconds,
the meter's default function is " A"( frequency weighting) ,
" Fast"( time weighting) " Auto range ". The
LCD display will show the Symbol " A, FAST , xx.x dB ".
4-2 Sound Pressure Measurements Range select
Use the "
▲
Button " ( 3-3, Fig. 1 ) to select
the Sound Measurement Range shown (AUTO , 30 - 80 , 50 - 100 ,
80 - 130 ,AUTO) reading in the center of the range. If dashes
appear on the display select a new range , After power on the
default range is " Auto range " In the same time the LCD display
b. The characteristic of A weighting is simulated as
will show the text of " AUTO " Under the auto range.
4-3 Sound Frequency weighting select
How to select the frequency weighting ( A or C),
by pressing and holding the "
▼
Button " ( 3-6, Fig. 1 ) for at
least 2 seconds to select A or C Frequency weighting
Note :
a. The characteristic of A weighting is simulated as the
b. The characteristic of A weighting is simulated as
" Human Ear Listening " response.
the " Human Ear Listening " response.
Typically always select the A weighting when makes
Typically always select the A weighting module when
environmental sound level measurement.
makes environmental sound level measurement.
b. The C weighting characteristic is near the " FLAT "
c. The C weighting characteristic is near the " FLAT "
response. Typically it is suitable for checking the
response. Typically it is suitable for checking the
noise of machinery ( Q.C. check ) & knowing the
noise of machinery ( Q.C. check ) & knowing the
real sound level of the tested equipment.
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