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Calibration

Calibration

Description

It’s now been over a year since AcSoft setup its own noise and vibration calibration laboratory and our offering has grown from strength to strength.

Our first task as a laboratory was to directly replicate the microphone calibration system used by “GRAS Sound & Vibration” in Denmark, parent company of our very own GRAS UK. This allows us to fully calibrate 1/8, 1/4, 1/2 and 1 inch microphones from GRAS or any other manufacturer and all traceable to national standards.

We then replicated the complete Svantek acoustics calibration system so we can calibrate all Svantek instruments and calibrators. With this system we can perform a full factory calibration on all Svantek instruments which means all new instruments we ship to customers have a fresh calibration certificate every time. In addition to Svantek instruments we can calibrate those made by other companies as long as we can get hold of the relevant technical data. Our library of data is growing rapidly so why not ask if we can calibrate your instrument.

The last part of our capability to go in was a vibration calibration fixture. We use a Data Physics 16kg shaker together with Soundcheck software (from Listen in the States) and a Dytran reference accelerometer to give us a wide range of capabilities.

All our kit is housed in an air conditioned, purpose built laboratory and is calibrated to nationally traceable standards. Next on our agenda is to go for ISO17025 and UKAS accreditation but that normally takes a year or more to achieve so watch this space!

AcSoft Calibration – Statement of Competence and Traceability
AcSoft Calibration, a trading name of AcSoft Ltd, performs calibration on sound & vibration instrumentation at its dedicated laboratory in Thurleigh MK44 2YA. Capabilities include calibration of sound level meters, vibration level meters, microphones, accelerometers and calibrators/pistonphones.

AcSoft has invested in three calibration systems for this purpose :-

1) For calibration of microphones, sound level calibrators and pistonphones, the 90CA Calibration System from GRAS Sound & Vibration is used for electrostatic calibration of all types of condenser microphones, as well as pressure coupler calibration of array microphones. Insert voltage calibration is used for microphone sensitivity. Although predominantly used for GRAS microphones and preamplifiers, microphones from other manufacturers may also be done, providing free field calibration data is available for that type. Traceability* is to Exova Metech, a DANAK accredited laboratory in Denmark.
2) For calibration of sound and vibration meters, a bespoke calibration system from Svantek Poland is used, identical to that used by Svantek S.p.o.o. as part of their ISO17025 accreditation. Sound level meters are calibrated according to the procedures in BS EN 61672-3:2013, and vibration meters are calibrated according to BS EN 608041 and other internal procedures. Although predominantly developed for calibration of Svantek sound & vibration analysers,other manufacturers can be supported, provided the information required by BS EN 61672-3:2013 is available in their instruction manuals. Sound level calibrators are calibrated according to the requirements of BS EN 60954 on a comparison basis. Traceability is to GUM, the Central Office of Measures, in Poland.
3) For calibration of accelerometers, a bespoke shaker system from Data Physics is used for sensitivity calibration over a range of frequencies, and a Dytran 3123AK reference accelerometer set is used. This provides spot frequency checks over the range 500Hz-5kHz.
For low frequency calibration, a Svantek SV111 calibrator is used, to include ISO8041 weighting curves, at 15.96Hz, 79.6Hz and 159.2Hz. Frequency response up to 40kHz is obtained using a Bruel & Kjaer 4290 accelerometer calibrator. Traceability for sensitivity is to NIST in United States, and low frequencies to GUM, Poland.
A full-time calibration technician is employed in the laboratory and receives regular training at our instrumentation suppliers. Calibration instrumentation is periodically re-calibrated on an annual basis. *Traceability may vary over time, as different reference laboratories may be selected according to their capabilities. Current traceability will be stated on the calibration certificates. AcSoft Calibration provides services directly to customers, as well as to customers of GRAS Sound & Vibration UK Ltd and Svantek UK Ltd

John Shelton
Managing Director
AcSoft Ltd

For a statement of our capabilities click here