14
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:
