• Fast and accurate calibration of sound measuring instruments including sound level, level stability, frequency and distortion using predefined test signals
• Sensitivity calibration of microphones using the insert voltage methods ensures a high degree of accuracy
• All measurements are securely archived for retrieval and test report generation
• Frequency response calibration of microphones using electrostatic or acoustical methods
• Test signals comply with IEC 61672 and DIN 45657 as well as several other sound level meter standards
• Test of octave and fractional octave filters
• Self-test program available
• 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)
  
  
  

Calibration of Microphones:
The results from the microphone and instrument calibration may be combined to validate conformance with standards for a complete sound level meter.

• Sensitivity of the microphone as mV/Pa and dB rel.1V/Pa.
• Frequency response using an electrostatic actuator in the frequency range 20 Hz – 80 kHz.
• Short test time using sine-sweep techniques for electrostatic actuator measurements. A typical calibration consisting of 3 repeated measurements takes less than 1 minute.

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 acoustically 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.

Uncertainties:
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.

Traceability:
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.