General Tools and Instruments DSM8925 - Manual (Page 7)

FAST Meter is applying fast time weighting
to inputs
SLOW Meter is applying slow time weighting
to inputs
AUTO Meter is automatically choosing
measurement range with best
resolution
MANU Meter is using user-selected
measurement range
BA Reserved for future use
SPL Abbreviation of sound pressure level
(the parameter measured)
Meter’s battery is very low on charge
and should be replaced
A Meter is applying “A” frequency
weighting to inputs
C Meter is applying “C” frequency
weighting to inputs
dB Sound level unit (accompanies
reading at its left)
40 Range Baseline (low end of current
measurement range, in dB). “40”
indicates 40 to 70 dB range; other
possible numbers in this display
position are 60 (for 60 to 90 dB
range), 80 (for 80 to 110 dB range)
and 100 (for 100 to 130 dB range)
+0, +10, Labels of analog bar graph scale.
Indicate amplitude of input (in dB)
relative to Range Baseline above left
end of graph
7
+20, +30