Galaxy Audio CHECK MATE CM-140 - Manual (Page 7)

ƒ Power Button
The ¡ key turns the sound level meter ON or OFF.
„ MAX / MIN Hold button
Press button to enter the maximum and minimum
recording mode. Select the proper level range before
using MAX/MIN to ensure that reading value will not
exceed the measurement range. Press once to select
MAX value. Press again to select MIN value, and press
again to select current value with “MAX MIN” “
enunciator blinking.
Press and hold down button for 2 seconds to exit the
MAX/MIN mode.
Note: If change sound level range or change A-C
weight, the MAX.MIN mode will clear.
… Frequency Weighting Select Button
A: A - Weighting. For general sound level measurements.
C:
C - Weighting. For checking the low-frequency content
of noise.
(If the C-Weighted level is much higher than the A-
weighted level, there is a large amount of low-frequency
noise)
† Time Weighting Select Button.
FAST: for normal measurements
SLOW: for checking average level of fluctuating noise.
‡ Level Range Control Button
Each time the level button is pressed, the level range will
change between “Lo” level, “Med” level and “Hi” level in
the circular manner.
ˆ Microphone
1/2 inch Electret condenser microphone
CM-140 SPL METER
5
MAX
MIN
MAX
MIN