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).