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 , 0 ".
2) Frequency weighting select
How to select the frequency weighting ( A or C), the
procedures please refer to chapter 7-7 page 20 .
Note :
a. The characteristic table of A,C weighting, please
ref. page 24.
b. 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.
c. 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.
3) According to various measuring sound source, select the
Time Weighting ( Fast or Slow ) by pressing " ENTER
Button " ( 3-7 , Fig. 1 ).
Note :
a. If select the function of " Fast " time weighting, the
display will show the unit of " FAST".
b. If select the function of " Slow " time weighting, the
display will show the unit of " SLOW ".
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