This document is the user manual for CAL150 Precision Acoustic Calibrator
This manual provides step-by-step instructions for installing the battery, selecting output levels, calibrating microphones, and performing environmental adjustments. It includes technical specifications, calibration corrections for temperature and pressure, and guidelines for recalibration. The device is designed for both field and lab use, offering 94.0 or 114.0 dB output at 1 kHz, calibrated to NIST standards.
Safety and environmental precautions are detailed, including stabilization times for temperature changes and avoidance of electromagnetic interference during calibration.
| Calibration sound pressure level (factory specification) | 94.0 dB and 114.0 dB ±0.3 dB SPL re: 20µPa @ 101.3 kPa, 23 ºC and 50 % RH |
|---|---|
| Equivalent free-field level | 93.88 dB and 113.88 dB for 1/2” free-field microphones |
| Frequency | 1 kHz ± 1 % |
| Harmonic distortion | < 2% |
| Static pressure range | 65 kPa to 108 kPa, SPL variation will be < ± 0.4 dB |
The CAL150 provides 94.0 dB or 114.0 dB output levels, selectable via a slide switch.
The CAL150 runs for approximately 100 hours on a nine-volt battery when using the 114 dB output level.
The output frequency is 1 kHz.
The harmonic distortion is less than 2%.