We have calibration services for the following equipment: microphones, sound level calibrators, vibration transducers and loggers, and vibration calibrators.
We calibrate ½ (LS2P) and 1 (LS1P) inch condenser microphones described in the standard IEC 61094-1 (Table 1). The calibration method depends on the ac-curacy required by the customer. The smallest calib-ration uncertainties can be achieved by using the re-ciprocity method. In many cases, a comparison with a reference microphone by a sound level calibrator is adequate.
Table 1. Uncertainties of calibration for measurement microphones.
Sound level calibrators
The most common devices calibrated at MIKES acoustics laboratory are sound level calibrators and pistonphones. We calibrate the sound pressure levels at fixed frequency points. At the same time, the distortion and frequency of the sound source is measured (Table 2).
Table 2. Calibration ranges and uncertainties for sound level calibrators. The type of the measurement
Vibration transducers and loggers
We calibrate vibration transducers, loggers and vibration measurement devices in the frequency range 1 Hz – 10 kHz. Typical nominal acceleration is 10 m/s2. The calibration gives the magnitude and the phase of the sensitivity of the vibration trans-ducer. The uncertainty of the calibration depends on the transducer under calibration. Typical uncer-tainties for the magnitude are 1–3 % and for the phase 1–2° depending on the frequency.