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tbs25

TBS25 Test Chamber

TBS25 is a dedicated test chamber with exceptional performance and signal reproduction

Battery current

Battery eliminators can be connected inside the TBS25 to measure battery current.

Telecoils

A built-in loop is provided for testing telecoil function.

Electrical signals

Two auxiliary inputs are available to connect a hearing aid to electrical signal sources such as an electronic programming system.

Directional microphones

The TBS25 approximates free field conditions above 500Hz and has the speaker in the same vertical plane as the hearing aid.

The future - complex signals

Future testing of hearing aids is expected to involve more complex stimuli and demand
a higher acoustic performance from the test chamber than needed for pure tones.

The ultimate test chamber

TBS25 is a dedicated test chamber with exceptional performance and signal reproduction. It offers a compact solution in situations where maximum attenuation is critical and space considerations are relevant. It can be used with the Equinox and Affinity platforms for hearing aid testing and with a variety of proprietary and non standard equipment.

Very high noise rejection

Low frequency noise is prevalent and a problem in many buildings. Low frequency noise rejection has traditionally been achieved with large sand filled test chambers. However, new materials and construction techniques have enabled the TBS25 to outperform these larger chambers by between 25dB and 40dB at low frequencies. High frequency noise rejection remains equal to that of the best traditional test chambers.

Non-linear hearing aids

Non-linear circuits are sensitive to ambient noise and can trigger performance changes not related to the input signal. Automatic noise reduction features, such as averaging, cannot overcome this effect, so the only solution is to provide sufficient attenuation to block unwanted noise. The noise rejection of the TBS25 will allow measurement of hearing aid performance down to input levels of 35dB SPL in nearly all situations.