MRC SL-4035SD - Sound Measurement Procedures; Performing SPL Measurements

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 " Powe
r
Button " ( 3-2, Fig. 1 )for at least 1.5 seconds,
the meter's default function is " A frequency weighting ,
" SPL " " & " Fast time weighting "&" Auto range ". The
LCD display will show the Symbol " A.SPL, Fast , Auto ".
2)
Frequency weighting select
How to select the frequency weighting ( A or C), the
procedures please refer to chapter 7-7 page 21 .
Note :
a.
The characteristic table of A,C weighting, pleas
e
ref. page 25.
b.
The characteristic of A weighting is simulated as the
" Human Ear Listening " response.
Typically always select the A weighting when make
s
environmental sound level measurement.
c. The C weighting characteristic is near the " FLAT
"
response. Typically it is suitable for checking the
noise of machinery ( Q.C. check ) & knowing the
real sound level of the tested equipment.
3)
Determine proper measuring range by pressing and holding
the " Range Button " ( 3-5, Fig. 1 ) for at least 1.5 seconds.
until the desired range is shown (AUTO , 30 - 80 , 80 - 130db ,
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
will show the text of " Auto " Under the auto range.
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