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Acoustic Calibration ServicesIEC/ANSI traceable calibration for the entire measurement chain

Traceable acoustic calibration services according to international IEC and ANSI standards. Ensure that your instrument accurately indicates the measured parameters. All calibrations are documented, traceable, and digitally signed in cooperation with an accredited calibration laboratory.

Acoustic Calibration Services highlights

International Standards

Acoustic calibration services are traceable according to IEC and ANSI international standards. Supported standards are IEC 61672, IEC 60651/ 60804, BS 7580, ANSI S1 4,  ANSI S1.43, IEC 61260, IEC 60225, IEC 60942, IEC 61094-4, and IEC 61094-6.

Accredited Calibration Laboratory

All acoustic calibrations are performed in cooperation with an accredited calibration laboratory.

Quick Turnaround Time

We offer a quick, 5 days calibration turnaround time (shipping time excluded).

Calibration Management System

We will notify you at the right time when your calibration is about to expire. We also offer calibration process tracking.

Digitally Signed Certificates

All our acoustic calibration certificates are digitally signed and always available to check online via the included link.

35 Years Experience

Our calibration lab has 35 years of experience with sound and vibration measurement equipment service.

Dewesoft quality and 7-year warranty

Enjoy our industry-leading 7-year warranty. Our data acquisition systems are made in Europe, utilizing only the highest build quality standards. We offer free and customer-focused technical support. Your investment into the Dewesoft solutions is protected for years ahead.

Reasons for Performing Calibrations

Calibration may be required for the following reasons:

  • New instrument

  • Repair or modification

  • The specified time period has elapsed

  • Specified usage (operating hours) has elapsed

  • Critical measurement - before and/or after

  • A special event occurrence, for example

    • exposure to shock, vibration, or physical damage

    • change in environmental conditions

  • Performance appears questionable or indications do not match surrogate instruments

  • Requirements, e.g., customer specification or instrument manufacturer recommendation

Sound Level Meters

Calibrations of sound level meters are performed according to standards IEC 61672, BS 7580, ANSI S1 4, and ANSI S1.43. Procedures include tolerances and are designed to verify that the characteristics of the sound level meter are correct. Examples of characteristics tested: frequency response of microphone and filter, the time weightings (Fast, Slow, etc.), level linearity, over-range indication, etc.

Sound level meters are divided into different classes of accuracy, where class 1 is intended for precision measurements and class 2 is for simple measurements. Approximate accuracy for a sound level meter of class 1 is 1 dB and dB for SLM class 2 is 2 dB.

SIRIUS as Sound Level Meter

SIRIUS data acquisition systems can be calibrated using the procedure for class 1 SLM in accordance with IEC 61672 when used for sound power measurements.

Octave Filters

Periodic tests of Octave band and fractional octave band filters, whether as dedicated instruments, built-in sound level meters, or other instruments are performed according to standard IEC 61260 or IEC 60225.

When measuring the spectral contents of sound, the signal is divided into frequency bands with constant relative bandwidth. Constant relative bandwidth means that the width of the band (number of Hz included in the band) is proportional to the center frequency of the band. The most common relative bandwidths are the 1/1 and 1/3 octave bands.

Characteristics for the frequency bands are specified in the international standard, IEC 61260. In this standard, two classes of accuracy are stated, 1 and 2, where class 1 is the best. However, up to 1995 an old standard, IEC 60225, was applied and many of those instruments specified to this standard are still in use.

Acoustic Calibrators

Acoustic calibrator calibration complies with IEC 60942. The standard defines three classes of accuracy, LS, 1, and 2. Class LS is intended for laboratory use only while classes 1 and class 2 are intended for field use. Calibrations are performed at a single frequency - 250 or 1000 Hz – and at supported acoustic pressure levels (usually 94, 104, or 114 dB).

Calibration is performed by the comparison method using the Brüel & Kjær Pistonphone 4228 as the standard comparative sound pressure level. The calibration report includes measurements of Sound pressure level, Frequency, and Total Distortion. If the instrument is equipped with an accessory barometer, this is checked at the current air pressure.

Measurement Microphones

Calibration of all types of microphones according to IEC 61094-4 – 1” and other standard 1/2", 1/4", and 1/8" measurement microphones with or without preamplifiers.

The sensitivity of the microphone being calibrated is measured by comparison with a reference microphone. The two microphones are exposed to the same sound pressure in an active comparison coupler, which contains a built-in sound source. The measurement frequency can be set to either 250 Hz (252.2 Hz) or 1000 Hz.

The measured sensitivity is valid under the environmental conditions during the measurement. Correction is made for the influence of environmental pressure, temperature, and humidity on the reference microphone.

The frequency response is determined using an electrostatic actuator (IEC 61094-6). This is a widely used tool that can simulate a constant sound pressure on the diaphragm of the microphone over a wide frequency range. The actuator measurement is a relative measurement. The results are normalized at the sensitivity measurement frequency (reference frequency), 250 Hz (251.2 Hz), or 1000 Hz. Depending on the type and application of the microphone, free-field or diffuse-field corrections may be added to achieve the required type of frequency response.

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