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Verifit
®
User's Guide Version 4.8 © November 2016
Coupling for binaural/wideband tests
WARNING : To reduce the risk of contamination, hearing instruments should be clean before putty is applied
and putty should be replaced frequently
For non-ANSI test-box tests (e.g. Speechmap) the two 0.4 cc wideband couplers must be used. NOTE: under no
circumstances are the blue 2cc couplers to be used in Speechmap. Test-box speechmap is designed for the 0.4cc
volume; substituting a 2cc coupler will cause hearing aid output to be seriously under-reported. The binaural
coupler microphone is coded with a red and blue side for right and left ear respectively.
When connecting the couplers onto the binaural coupler microphone, it is important that they produce a good
acoustic seal. Ensure each coupler is fully inserted in the retention slot. To remove, push the red or blue levers
while pulling up on the coupler.
BTE instruments are coupled to the 0.4cc coupler using the earmold and putty or using the provided earmold
substitues (HA-4) coupled to TRIC adapters. When the earmold is used, ensure the eartip is flush with the inside
of the coupler opening. Putty should not extend into the coupler cavity or block the sound outlet of the mold.
Vents should be sealed at the lateral end. It is very important that the instrument be well-sealed to the coupler.
Use the hearing instrument stabilizers to prop the BTE body in the vertical, as-worn position.
Custom instruments are sealed to the 0.4cc coupler with putty so that the end of the eartip is flush with the
inside of the coupler opening. Putty should not extend into the coupler cavity or block the sound outlet of the
instrument.
Vents should be sealed at the faceplate end. It is very important that the instrument be well-sealed to
the coupler.
Open fit instruments may not be fit in the test-box.
RITE (Receiver in the ear) instruments which are fit with an occluded canal (e.g. with a micro-mold or
occluding dome) are coupled to the 0.4cc coupler using the TRIC adapter. For particularly large receivers,
insertion is easiest with the TRIC adapter not yet mounted on the coupler. Fold the TRIC adapter in half to open
the hole temporarily to ease insertion of larger receivers.
Excess low frequency output is usually due to open vents or a poor seal to the coupler.
For health reasons, hearing instruments should be clean before putty is applied and putty should be replaced
frequently.
Positioning HI for binaural/wideband tests
1. The hearing instrument should be coupled to the 0.4cc coupler with a battery installed. See Coupling the
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