General Tools and Instruments DSM8925 - Manual (Page 8)

SETUP INSTRUCTIONS
INSTALL FOUR BATTERIES
The meter’s battery compartment is
accessible from the back of the unit. Use a
Philips-head screwdriver to remove the one
screw holding the cover in place. Then install
the four included “AAA” batteries so their +
and – ends match the images stenciled inside
the compartment. Finally, replace the cover
and secure it with the Philips-head screw.
OPERATING
INSTRUCTIONS
MAKING BASIC MEASUREMENTS
To begin, press the button to power on the
meter. The display will take a few seconds to
stabilize and then begin reading out real-time
sound level measurements.
Note how the digital numbers and the
readings from the analog bar graph track each
other. At times, the two displays may seem
slightly out of sync—and they are, because
they refresh at different rates.
Also note how the number above the left end
of the bar graph—the Range Baseline—
changes each time a much louder or softer
sound is heard. Each change confirms that the
meter is operating in Autoranging mode. To
demonstrate that autoranging is on in a quiet
environment, rub the windscreen with your
hand (to simulate a loud noise) and watch the
Range Baseline change to 100.
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