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Instruction manual

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1/1-Octave and 1/3-Octave Analysis
1/1-Octave and 1/3-Octave Analysis for Maximum and Minimum
Level (L
max
, L
min
)
To make the measurement, carry out the following steps. The procedure is almost identi-
cal to the instantaneous value measurement.
1. Set the power switch on the side of the unit to ON.
Call up the DISPLAY menu screen by pressing the DISPLAY key, make the neces-
sary settings, and press the DISPLAY key again to close the menu.
2. Press the SETUP key to call up the SETUP menu screen, and set the required items.
(For an explanation of the Lmax/Lmin type setting, refer to the explanation below.)
3. Press the SETUP key again to return to the measurement screen.
4. Use the SLM / 1/1 / 1/3 key to activate the sound pressure level measurement
screen.
5. Use the FREQ WEIGHT key to select the desired frequency weighting setting.
For normal sound pressure level measurements, select "A" weighting. For sound
pressure level measurements with "C" weighting, select "C". When "L
p
" is selected,
frequency weighting is flat.
6. Use the TIME CONST key to select the desired time weighting setting.
Normally, the "FAST" setting should be used.
7. Use the LEVEL UP/DOWN keys to select the level range. Choose a setting in
which the "OVER" and "UNDER" indications do not appear.
8. Use the SLM / 1/1 / 1/3 key to activate the 1/1-octave analysis or 1/3-octave analy-
sis screen.
9. The display is updated every 100 ms. Since this makes the values hard to read, use
the PAUSE/CONT key to pause the bar graph, move the marker to the desired
position, and read the value. Alternatively, you can also use the GRP/NUM/L-T key
to activate the numeric reading.
Lmax/Lmin type setting
AP (All-pass maximum/all-pass minimum)
The analysis result applies to the point where the all-pass level in the processing
time was maximum or minimum.
BAND (Band maximum/band minimum)
The analysis result applies to the point where the level for each frequency band in
the processing time was maximum or minimum.
Factory default setting is "AP".