Instruction manual

Measurement

Equivalent continuous sound level (L

) measurement

The procedure for equivalent continuous sound level measurement is de-

scribed below.

Preparations as described in the “Preparations” chapter must be completed

 rst.

1. Turn power to the unit on.

2. Press the MENU/ENTER key and select the frequency weighting

characteristic on the menu list screen. For normal sound level mea-

surements, select the “A” setting.

The frequency weighting characteristic can be set even on the mea-

surement setting screen in the menu list screen.

3. Select the time weighting characteristics on the menu list screen.

Normally, select the “F(Fast)” setting. (This setting does not affect

a measurement result of equivalent continuous sound level.)

The time weighting characteristic can be set even on the measure-

ment setting screen in the menu list screen.

Note

The unit performs high-speed sampling of the sound

pressure waveform (20.8 µs) to determine L

and

. It is therefore not affected by time weighting

characteristics.

4. Select [Display] on the menu list screen and set the upper and lower

limit of the bar graph. The upper and lower limit of the bar graph

can be set even on the measurement screen. If the “OUTPUT OVER”

indicators appear frequently, change the limit of bar graph setting.

5. Change to the setting that displays L

on the measurement screen.

Use the keys to select [Display] and press the MENU/

ENTER key. The display screen appears.

6. Use the

keys to select [L

] and press the MENU/ENTER key.

The ON/OFF setting screen appears.