24
⑫
AC/DC output signal jack
:
Connect the sound level recorder to the AC/DC output on the bottom of the instrument.
AC: 1 Vrms represents 130dB (with frequency weighting)
DC: 10mV/dB output
⑬
USB interface
:
For connection to a computer or to an external power supply.
⑭
Part to unscrew for the use of the extension accessory.
3.2. THE DISPLAY UNIT
SYMBOL FUNCTION
Battery charge level check light
Auto off check light
Maximum/Minimum check light
F/S time weighting check light
Sound level range indicator
Bargraph analog display
SpL
Time-weighted sound pressure level
Leq
Average equivalent continuous sound level
Time set or elapsed time (hour:minute:second)
Start/Pause/Stop integrated sound level measurement
hms
Integration time
Frequency weighting indicator (A or C)
Sound level reading (30.0-130.0dB)
Date set or elapsed time (year-month-day)
Measurement range overshoot indicator
Timer
Integration time meter
Leq recording check light
Memory address
DC signal
AC signal
Ground