8
9
Note…
An internal backup battery will continue to power the clock for 30 hours in
the absence of both the AA batteries and a DC adapter. The backup battery
will recharge when AA batteries or a DC adapter powers the meter.
CALIBRATION
The meter has been factory calibrated. Annual calibration is
recommended for best results.
1. Press
POWER
for 3 seconds to turn
off
.
2. Press and hold
MIN/MAX
and then press
POWER
to turn the meter on. “CAL
94dB” displays.
3. Fully insert the microphone into an
acoustic calibrator with a ½ inch
insertion socket such as Sper
Scientific’s 850016.
4. Set the calibrator to emit 94.0 dB and
turn the calibrator on.
5. Press ▲or ▼ to increase or decrease
the reading to 94.0 dB.
6. Press
MIN/MAX
to save.
7. Press
POWER
to exit calibration.
