General Tools and Instruments DSM8921 - Manual (Page 11)

SELECTING AUTOMATIC AND
MANUAL RANGING
The meter features six measurement
ranges in 10dB steps:
30~80dB, 40~90dB, 50~100dB,
60~110dB, 70~120dB, 80~130dB.
When you turn the meter on, it will be in
automatic range mode and a small AUTO
will be displayed on the left side of the
screen (See Fig.11) . In this mode, the
meter will adjust the measurement range
automatically for accuracy. The two digit
number to the left of the bar graph on
the LCD will show the low end of the
current range.
You can also set the range manually. This
is helpful when you know the measurement
range in advance. The meter will be able to
take readings more quickly, because the
unit does not need to first establish the
range before displaying the measurement.
BACKLIT KEY (8922 only)
Offer a light for approximate 5 seconds
to make it easier to see the display in
the dark.
+10
SPL SPL
Fig.11
+10
SPL SPL
Fig.12