90db 50db – General Tools and Instruments DSM8921 User Manual
Page 5
MEASURING SOUND LEVELS
Sound levels are displayed both digitally
and in a bar graph. The digital display
is updated every 160ms, while the bar
graph is updated every 40ms.
Press the ON/OFF key to turn the
meter on. The unit will first display
the full screen and then count down
to zero.(See Fig. 1)
The meter will now begin measuring
the current sound levels.(See Fig.2)
Point the microphone toward the source
of the sound to be measured.
Fig.1
+10
+20
+30
+40
+50
90
90dB
50dB
Fig.2
+10
+20
+30
+40
+50
50
SPL
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