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3- Power & Backlight Button
The power button turns the sound level meter ON and OFF, it also
turns the backlight ON and OFF.
Press it once to turn the sound level meter on.
Press it again for moment to turn the backlight ON and OFF.
Press and hold the power button for 3 seconds to turn the power OFF.
Note: When the meter is turned on, the LCD will show how much memory
is currently available.
4- MAX/MIN Hold Button
Press the MAX
MIN button to enter the maximum and minimum record-
ing mode. Select the proper level range before using MAX/MIN mode to
ensure that the reading value will not exceed the measurement range.
Press the button once to select MAX value. Press it again to select MIN
value, and press it once again to select current value with “MAX MIN”
annunciator blinking.
Press the MAX
MIN button and hold it down for 2 seconds to exit the
MAX/MIN mode.
Note: If the sound level range or change A-C weight are changed, the
MAX/MIN mode will be cleared.
5- Record Datalogger Button
When the REC button is pressed, the meter will start recording. The
“REC” annunciator is displayed. Press the button again to stop recording.
6- Frequency Weighting Select Button
A:A-Weighting is for general sound level measurements
C:C Weighting is for checking the low-frequency content of noise
Note: If the C-Weighted level is much higher than the A-weighted level,
then there is a large amount of low-frequency noise.
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