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SETUP MODE
Setting the Clock
This meter includes a clock that records the date and time along with
measured data.
1. Press and hold
CLOCK
for longer than 2 seconds.
2. Press ▲ or ▼ to adjust the number, press
CLOCK
to adjust the next item.
3. The setting adjustment order is year→ month→ day→ hour→
minute→ second. Press
CLOCK
to complete adjustment. To cancel a
setup process, press
POWER
.
Note…
An internal (rechargeable) backup battery runs the clock when the meter
is turned
OFF
. The backup battery is recharged by the main batteries.
The clock will run for 30 minutes on the backup battery alone. If the
meter will not be in use for an extended period one month or longer),
remove the main batteries to prevent possible damage due to battery
fluid leakage. After reinstalling the batteries, set the date and time.
CALIBRATION
The meter has been factory calibrated. Annual calibration is
recommended for best results.
1. Prepare for calibration by setting up the meter as follows:
• Frequency scale: A
• Time weighting: FAST
• Measurement mode: Disable Min/Max function.
• Level range: 30 to 130 dB
2. Fully insert the microphone housing into an acoustical calibrator with a
½ inch insertion hole such as a Sper Scientific 850016.
3. Switch the calibrator to emit 94.0 dB. Turn the calibrator on. Using the
calibration tool, adjust the CAL potentiometer on the meter until the
LCD displays 94.0 dB.
MEASUREMENT PROCEDURES
1. Press
POWER
to turn the meter on.
2. Select the desired response time and frequency weighting.
Note…
If the sound source consists of short bursts or sudden changes in sound
level, set the response time to FAST. To measure typical sound level,
use the SLOW setting.