Galaxy Audio CHECK MATE CM-140 - Manual (Page 10)

(3) Do not store or operate the instrument at a high
temperature or in a high humidity environment.
(4) Keep microphone dry and avoid severe vibration.
(5) Take out the battery and keep the instrument in a low
VIII. Measurement
(1) Open battery cover and install a 9V battery in the
battery compartment.
(2) Turn power ON and select the desired response time
and weighting. If the sound source consists of short
bursts or only catching sound peak, set response to
FAST. To measure average sound level, use the
SLOW setting.
Select A- weighting for general noise sound level and
C-weighting for measuring sound level of acoustic
material.
(3) Select desired level.
(4) Hold the instrument comfortably in hand and point the
microphone at the suspected noise source. The sound
pressure level will be displayed.
(5) When MAX/MIN (maximum, minimum hold) mode is
chosen, the instrument captures and holds the
maximum and minimum noise level for a long period
using any of the time weightings and ranges.
Press the MAX/MIN button 2 seconds to clear the
MAX/MIN reading. “ MAX/MIN ” symbol disappears.
(6) Turn OFF the instrument.
CM-140 SPL METER
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