Sper Scientific 840029 Sound Meter Digital - Manual (Page 5)

Internal Calibration:
 Slide the POWER selector to an ON position.
 Slide the RANGE selector to the 50 ~ 100 dB position.
 Slide the RESPONSE selector to FAST.
 Slide the WEIGHTING selector to CAL.
 Use the calibration screw driver to gently turn the CALIBRATION
ADJUSTMENT until the display reads 94.0 dB.
External Calibration:
Use Sper Scientific's Acoustical Calibrator 840031 (or equivalent) to
calibrate the unit, including the microphone, in compliance with OSHA.
 Slide POWER selector to an ON position.
 Power on the acoustical calibrator and place the calibrator onto the
Sound Level Meter's MICROPHONE.
 Slide the RANGE selector to the 50 ~ 100 dB position.
 Slide the RESPONSE selector to FAST.
 Slide the WEIGHTING selector to "A".
 Use the calibration screw driver to gently turn the CALIBRATION
ADJUSTMENT until the display reads 94.0.
E. PRECAUTIONS
 Do not store or operate the unit in high temperatures or in a
high humidity environment for long periods.
 Keep the microphone dry and avoid intense vibrations.
 Do not force the CALIBRATION ADJUSTMENT, doing so may
damage the mechanism and void the warranty.
F. BATTERY REPLACEMENT
Replace the battery when "BAT" is displayed. Accurate measurements
may be made for several hours after the low battery indicator appears.
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