5. CALIBRATION
It is recommended that an acoustic calibration using a CEL-110/2 (or CEL-110/1) calibrator be performed before and after taking measurements.
PROCEDURE
1. Switch ON the Acoustic Calibrator (Refer to the Calibrator Instruction Manual).
2. Check the Acoustic Calibrator has a 114dB (or 94dB) output.
3. Make sure the instrument is set to the 60-130dB range.
4. Fit the Acoustic Calibrator firmly over the microphone. The instrument automatically detects a 1kHz tone from a 94 or 114dB Calibrator and enters Calibration Mode (Refer to Figure 5).