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4. MEASURING PROCEDURE
4-1 Sound level meter
1) Power on by pressing the " Power On/Off Button " ( 3-3,
Fig. 1 ) , the meter's default function is " Auto range ",
" A frequency weighting " & " Fast time weighting ". The
LCD display will show the unit " A. Fast Auto ".
2) Select " A " or " C " frequency weighting by pressing the
" A/C Button " ( 3-7, Fig. 1 ) .
Note :
a. The characteristic table of A, C weighting, please
ref. page 22.
b. 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.
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 the
" Range Button " ( 3-6, Fig. 1 ).
After power on the default range is " Auto range ".
In the same time the lower right display will show the text
of " Auto ".
Under the auto range, press the " Mode Button " ( 3-6,
Fig. 1 ) more than 2 seconds continuously will enter
to the manual range ( range 1, range 2, range 3 ) and
auto range in sequence. There are still 3 manual ranges
for your choice :
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