25
Preparations
4. Press the Menu key again to return to the measurement screen.
5. Press the Cal key. The display becomes as shown below.
If the level range is not set to 30 to 120 dB, the indication flashes, and
the required calibration value is 6 dB under the range maximum.
Calibration
Before starting a measurement, the unit must be calibrated. There are two
types of calibration: electrical calibration and acoustic calibration using a
pistonphone.
Electrical calibration
The built-in oscillator (1 kHz, sine wave) is used for electrical calibration.
1. Turn the unit on by pressing the Power key.
2. Use the Level Range and keys to select the 30 to 120 dB range.
3. Press the Menu key to bring up the menu screen 1/5.
Verify that the Cal Mode is set to "Internal".
If "External" is shown, use the and keys to move the cursor to
"External" and use the and keys to set it to "Internal".
1 5
< S y s t e m >
M e a s . t i m e : 1 0 m i n
B a c k E r a s e : O f f
C a l M o d e : I n t e r n a l
F i l t e r : O f f
C a l M o d e
( C a l i b r a t i o n M o d e )
M e n u s c r e e n 1 / 5
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