4. MEASURING PROCEDURE
1. Slide the " A/C weighting selector " ( 3-4 ) to " A " or " C "
position for sound level measuring.
Note :
a. The characteristic table of A, C weighting, please
ref. page 7.
b. The characteristic of A weighting is simulated as
the " Human Ear Listening " response.
Typically, if making the environmental sound level
measurement, always select the A weighting typically.
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.
2. Determine proper measuring range by selecting the
" Range selector " ( 3-6 ) to minimize the tolerance of
readout. When left corner of LCD show " "
▲
(Range upper / lower indicator, 3-9), it shows the dB
range selection is upper or lower setting. Slide range selector
to other range for measuring.
3. According on various measuring sound source, select the
Time Weighting selector ( 3-5) to " Fast " or " Slow " position.
4. Hold the instrument in hand and point the microphone at
measured noise source, the sound level will be displayed
on " dB " ( decibel) unit.
5. Max. hold - During the sound level measurement, if
need to store the maximum ( peak ) value on display, please
slide the " Time weighting/ Max. hold selector " ( 3-5) to the
" Max. hold " position.
* When measure long-term stability under slowly varying
noise environment, please use the Max. hold function
to read the maximum values.
* Push the " Reset Switch ( 3-11, Fig. 1 ) will reset the
Max. Hold value and execute the Max. Hold function
again.
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