5
4. CALIBRATION
The meter's
CALIBRATION ADJUSTMENT
(9) is located on the front panel.
The meter has a built-in internal standard of 94 dB/1 KHz. Use the following
procedures to calibrate the instrument before operating for the first time, or
when the meter has not been in use for awhile.
Internal Calibration:
Slide the
POWER
(6) selector to the CAL. Position.
Slide the
RANGE
(5) selector to the 60 ~ 100 dB position.
Slide the
TIME WEIGHTING
(7) selector to "F".
Slide the
FREQUENCY WEIGHTING
(11) selector to "A".
Use the calibration screw driver to turn the
CALIBRATION
ADJUSTMENT
(9) until the display reads 94.0.
External Calibration:
Use Sper Scientifics' Acoustical Calibrator 850016 (or equivalent) to
calibrate the unit, including the microphone, in compliance with OSHA.
Slide
POWER
(6) selector to the "I" (on).
Turn on the acoustical calibrator and place it onto the Sound Level
Meter's
MICROPHONE
(1).
Slide the
RANGE
(5) selector to the 60 ~ 100 dB position.
Slide the
TIME WEIGHTING
(7) selector to "F".
Slide the
FREQUENCY WEIGHTING
(11) selector to "A".
Use the calibration screw driver to turn the
CALIBRATION
ADJUSTMENT
(9) until the display reads 94.0.
5. BATTERY REPLACEMENT
Replace the batteries when "BAT" is displayed. Accurate measurements
may be made for several hours after the low battery indicator appears.
Replace the batteries with 2 new heavy duty 9V batteries.
