Valcom V9992, Инструкция по эксплуатации

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SOUND LEVEL METER
3
Power Button
The key turns the sound level meter ON or OFF.
4
MAX / MIN Hold Button
Press button to enter the maximum and minimum recording mode. Select
the proper Level range before using MAX/MIN to ensure that reading value will
not exceed the measurement range. Press once to select MAX value. Press
again to select MIN value, and press again to select current Value with
“ MAX /MIN “ annunciator blinking.
Press
and hold down button for 2 seconds to exit the MAX/MIN mode.
Note: If change sound level range or change A-C weight, the MAX/MIN
mode will clear
.
5
Frequency Weighting Select Button
A - Weighting. For general sound level measurements.
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.)
6
Time Weighting Select Button
FAST: for measuring peak sound levels
SLOW: for measuring average or nominal sound levels
7
Level Range Control Button
Each time the level button is pressed, the level range will change between “Lo”
level (32 to 80 dB), “Med” level (50 to 100 dB) and “Hi” level (80 to 130 dB) in the
circular manner.
8
Microphone
1/2 inch Electret Condenser microphone
9
CAL Potentiometer
Calibration control, for level calibration adjustment.
5