B&K Precision 732A - Manual - Manual (Page 6)

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Note: When the user powers it on, the LCD will show how much memory space
is available to use (model 735).
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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 will begin to blink.
Press and hold down button for 2 seconds to exit the MAX MIN mode.
Note: If you change sound level range or change A-C weight, the MAX.MIN
mode will clear.
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5 Record Datalogger button (model 735)
When you press the button, the meter will begin recording. The “REC”
annunciator will be displayed, press again and it will stop recording.
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6 Frequency Weighting select button
A: A - Weighting. Used for general sound level measurements.
C: C - Weighting. Used 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)
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7 Time weighting select button
FAST: for normal measurements
SLOW: for checking average level of fluctuating noise.
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8 Level range control button
Each time you press the button, the level range will change between “Lo”
level, “Med” level, “Hi” level and “Auto” level.
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9 Microphone
1/2 inch Electret Condenser microphone
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10 CAL potentiometer
Is used for calibration adjustment.
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RS-232 Interface:
The RS -232 signal output is a 9600 bps N 8 1 serial interface.