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software COM3(COM4),then press ‘SETUP’,‘’
disappears from the display to indicate and disable auto
power off, that the USB data is transmitting.
⑤ FAST/SLOW button:
time weighting selection
FAST:Fast sampling measurement, 1 time per 125mS.
SLOW:Slow sampling measurement, 1 time per second.
⑥MAX/MIN button: Maximum and Minimum hold
Press this button for one time to enter MAX/MIN
measurement, ‘MAX’ will appear on LCD, maximum
sound level will be captured and held until higher sound
level is captured. Press the button again, ‘MIN’ will
appear on LCD and minimum sound level will be
captured and held until new lower sound level is
captured. Press the button one more time to exit
MAX/MIN measurement.
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