12
memory response, then press
‘
HOLD
’
to keep the setting.
“A/C”
Frequency weighting select button
A
：
A-Weighting
C
：
C-Weighting
“
HOLD” button:
Press “HOLD” button, The hold function freezes the
reading in the display.
Power button
Turn the meter power ON/OFF
External DC 9V power supply terminal
For connection with DC 9V power supply.
Aperture size: external diameter: 3.5mm, internal
diameter: 1.35mm
USB interface
USB signal output is a 9600 bps serial interface.
