7
7.
Button:
c
Sets the time weighting to FAST or SLOW mode.
FAST
: uses a 125ms time-constant. This setting is used in most
situations.
SLOW
: uses a 1s time constant, which smoothes out fluctuating
levels.
d
Data record mode: Press and hold this button for 3 seconds to
enter data recording mode. The “RECORD”
indicator will appear on the display and will
flash to indicate recording is in progress. To exit
data recording mode, press and hold for 3
seconds until the instrument returns to normal
mode and the “RECORD” indicator disappears.
e
Erase all records: Turn off the instrument, press and hold down this
button then turn on the instrument until the “CLr
RECORD” indication appears on the display.
8. I/O connector:
RS232 input/output connector for input of control signals and output
of measurement data.
9. AC output socket:
AC output signal with frequency weighting.
10. DC output socket:
DC output signal corresponding to sound level.
11. CAL potentiometer:
Calibration potentiometer for level adjustment.
12. External DC power supply socket:
Type 1.3 coaxial power connector; centre
negative, nominal 6V DC.
13. Tripod mounting:
¼” - 20 UNC Female thread.
14. Battery cover.
