E. Name and Functions:
1) Electric Condenser Microphone.
2) LCD Display.
3) Power switch
4) Level range control switch;
30dB—80dB; 50dB—l00dB;
60dB—10dB; 80dB—l30dB
5) Maximum value hold switch. (MAX)
6) Frequency weighting select switch.
A: A weighting for general sound level measurements.
C: C- weighting for checking the low frequency content of noise.
7) Time weighting select switch.
Fast: For normal measurements.
Slow: For checking average level of fluctuating noise.
8) AC output terminal: 0.707 Vrms Corresponding to each range step.
9) DC output terminal: output 10 mV/ dB
10) Calibration control
11) External DC 9V power supply terminal.
12) Battery Door.
13) Tripod mounting screw.
14) Windscreen
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