Periodic Verification of Sound Calibrators
- Sound pressure level corrected for pressure, temperature and humidity.
- Short term stability expressed in dB (option).
- Output frequency in Hz.
- Total distortion in % (option).
Periodic Verification of Sound Level Meters
The Periodic Verification of Sound Level Meters can be performed in accordance with several national and international standards. This includes measurements of:
- Accuracy of input range selector.
- Level linearity.
- Spectral weighting networks A, B, C, Z, Lin and Flat.
- F, S, and I time constants. Pulse measurement capability.
- RMS detector capability.
- Overload detector.
- Inherent noise using microphone equivalent or acousti-cally insulated test vessel.
- Integrating averaging functions Leq and SEL.
- Noise dose.
- 1/1 and 1/3 octave band filters (option).
The results from the microphone and instrument calibration may be combined to validate conformance with standards for a complete sound level meter.
The expanded uncertainties for calibrator and microphone measurements, are calculated as a combination of the uncertainty of the test system and the repeatability of the measurements. This includes the calculation of the standard deviations, degrees of freedom and coverage factor which are needed to estimate the 95% expanded uncertainty.
A digital and personalized course on uncertainties and how to set up an uncertainty budget can be purchased as option.
Each system is delivered with a certificate of calibration with traceability to SI units. Recalibration can be performed by the user with the built-in self test features (requires voltmeter), or by the manufacturer.