The Seal Integrity Meter contains two specially designed sound level meters, which measure sound only within the frequency range between 200 and 400 Hz.
The sound is measured by two, acoustically separated microphones which are housed inside the transducer (1). One microphone (2) measures the ambient sound level while the other microphone (3) simultaneously measures the sound level inside the ear canal - behind the ear mould, via the probe tube (4) and the ear mould (5).
A digital signal processor calculates the difference in the measured sound levels and presents the result (the attenuation) on the Seal Integrity Meter display.
A light indicating the value closest to the value measured will illuminate.
As long as the test sound of the Generator dominates, ambient noise will not affect the measurement. Both the SI meter and the EE-tone generator are provided with a battery supply.
The Probe Tubes are connected and only available for the filter types delivered by Groeneveld Elcea.
Note: With the Seal Integrity Meter the occlusion effect can also be measured. This measurement is mainly of interest for the hearing aid ear models.