4. MEASURING PROCEDURE
4-1 Sound Pressure Measurements (SPL)
In SPL mode the display shows readings of
the sound pressure level.
b. The characteristic of A weighting is simulated as
the " Human Ear Listening " response.
Typically always select the A weighting module when
1)
Power ON the meter by pressing and holding the
▼
Button
( 3-7, Fig. 1 )
for at least 2 seconds,
the display will show the Symbol "xx.x dB ,A, FAST ,Auto".
2)
Frequency weighting select
T
o select the frequency weighting ( A or C), press the
▼
Button ( 3-7, Fig. 1 ) once to change weighting ( A or C).
Note :
a.
The characteristic of A weighting is simulated as the
" Human Ear Listening " response.
Typically always select the A weighting when makes
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.
3)
According to various measuring sound source, How select the
Time Weighting ( Fast or Slow ) by press
▲
Button
( 3-6 , Fig. 1 ) to change Time Weighting ( Fast or Slow ) .
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 ".
7
