It is a unique system designed to verify the conformity of sound filters – individual filters and filter sets. This system is used in the Czech Metrology Institute.

The system is used to verify all filter characteristics defined by the standard automatically. These are the measurement of nominal attenuation, attenuation and integrated characteristic, linearity, signal counting, real-time filter work, and influence of pre-filters. Verification is performed on both bandpass and also on broadband filters. The system suits for correcting the effect of the sound level meter – to determine its frequency response and correct it. Values ​​can be measured from the filter output (AC value) or be red from the sound meter display. It is also possible to automatically measure the DC voltage at the sound level output. This voltage represents the signal level, but the relationship between the signal level and the voltage can be general.

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