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Chapter 1
Introduction
1.1 What is Multifunction Acoustic Calibrator Type 4226?
The high reliability of electronic measuring instruments such as sound level meters enables you
to make accurate measurements after a simple check with a single-tone calibrator. In many cases
this check is also carried out after each measurement to validate the results. To make sure an
instrument is working correctly, more comprehensive checks are required periodically. You can
make such a check and calibration with the Multifunction Acoustic Calibrator Type 4226 on
microphones, sound level meters and other acoustic instruments. The calibrator is easy to use so
you can make comprehensive checks whenever extra confidence is required in a measurement.
Fig.1.1
Type 4226 as delivered
in its case
1.1.1 General Use
Type 4226 is a laboratory precision instrument. Its size and the included power supply of four
alkaline cells make the instrument easy to use in-situ (for example, with a sound level meter or a
large measurement setup in an anechoic chamber). The simplicity of use also makes it highly
portable; no specific documentation or correction tables are required for checks on standard
Brüel & Kjær sound level meters, noise dose meters, microphones, etc.
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