10
⑧
Backlight button
8.0
．
Turn the backlight on/off
8.1
．
DATALOGGER response setting;
press the button continuously until
‘
INT
’
symbol appears
after the meter turn on, press
‘
LEVEL
’
to set up the data
memory response, then press
‘
HOLD
’
to keep the setting.
⑨
Frequency weighting select button
A
：
A-Weighting
C
：
C-Weighting
⑩
HOLD button:
Press “HOLD” button, The hold function freezes the
reading in the display.
⑾
Power button
Turn the meter power ON/OFF
⑿
External DC 9V power supply terminal
For connection with DC 9V power supply.
Aperture size: external diameter: 3.5mm, internal
diameter: 1.35mm
