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C：C-Weighting. For checking the low-frequency
content of noise.
(If the C-Weighted level is much higher than the
A-weighted level, then there is a large amount of
low-frequency noise)
Time weighting select switch.
FAST：for normal measurements.
SLOW：for checking average level of fluctuation
noise.
Microphone
1/2 inch Electret Condenser microphone.
CAL potentiometer
Calibration control, For level calibration adjustment.
AC output terminal
1Vrms corresponding to each range step.
Output impedance≒50Ω
Output signal by standard 3.5mm coaxial socket signal
on pin.
DC output terminal
Output：10mV/dB
Output impedance≒100Ω
Output signal by standard 3.5mm coaxial socket signal
on pin.
External DC 9V power supply terminal
For connection with AC adapter.
Tripod mounting screw.
Battery cover
Calibration procedures
Using a standard Acoustic Calibrator(94dB,1KHz Sine
wave)
(1) Make the following switch settings.
Display：dBA
Time weighting：FAST
Measurement mode：MAX MIN Mode function
disable. Level range：50 to100dB
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