Instruction manual

59
1/1-Octave and 1/3-Octave Analysis
Note
If measurement settings such as level range or frequency
weighting were changed during pause in instantaneous
value mode, the new settings will apply immediately when
pause is released.
If measurement settings such as level range or frequency
weighting were changed after processing, the new settings
will be effective only when processing the next measure-
ment.
1/1-Octave and 1/3-Octave Analysis for Instantaneous Value
(L
A
, L
C
, L
p
)
To make the measurement, carry out the following steps.
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 necessary settings, and
press the DISPLAY key again to close the menu.
2. Use the SLM / 1/1 / 1/3 key to activate the sound
pressure level measurement screen.
3. 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.
4. Use the TIME CONST key to select the desired time weighting setting.
Normally, the "FAST" setting should be used.
5. Use the LEVEL UP/DOWN keys to select the level range. Choose a setting in
which the "OVER" and "UNDER" indications do not appear.
6. Use the SLM / 1/1 / 1/3 key to activate the 1/1- octave analysis or 1/3-octave analy-
sis screen.
7. 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.