7. MEASUREMENT PREPARATION
① Remove the battery cover on the back and put in
one 9V battery.
② Recover the back cover.
③ When battery voltage drops below the operating
voltage or battery aging, this symbol will
appear on LCD. Replace the 9V battery.
④ When the AC adapter is used, insert the plug of the
adapter （3.5φ） into the DC 9V connector on the
side panel.
8. OPERATING PROCEDURE
① Power on the meter.
② Press ‘LEVEL’ button to select desired level, base
on ‘UNDER’ or ‘OVER’ do not appear on LCD.
③ Select ‘dBA’ for general noise sound level and ‘dBC’
or measuring sound level of acoustic material.
④ Select ‘FAST’ for instant sound and ‘SLOW’ for
average sound level.
⑤ Select ‘MAX/MIN’ button for measuring maximum
and minimum noise level.
⑥ Hold the instrument comfortable in hand or fix on
tripod and measure sound level at a distance of
1~1.5 meter.
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