Audioscan Verifit - Manual (Page 108)

Verifit ® User's Guide Version 3.12  May 2015
2. Highlight and <Pick> Test 1 and choose Speech-std(1), (2) or the ISTS at a Level of 65 dB. Press
<Continue> to run and record the speech passage.
3. Attach the FM receiver to the hearing aid and set the FM receiver to the default setting. The FM transmitter
should be ON and set to MUTE. Repeat step 2 but use Test 2 instead of Test 1. If the results of Test 1 & Test
2 are not similar, the presence of the FM receiver has changed the intended performance of the hearing aid.
Where possible, make programming adjustments to compensate -being careful not to make adjustments that
will change Test 1 results.
4. Move the hearing aid, attached to the coupler and microphone, outside the test box at least 12 in. (30 cm)
away from the FM transmitter*. Put FM transmitter microphone, set to Omni, within 2mm of the reference
microphone in the test box.
5. With the FM transmitter unmuted, repeat step 2. Note that the hearing aid is outside the test box during this
test - Quiet please! The results should be within +/- 2 dB of the results from step 3. If not, change FM
settings and repeat.
* A coupler mic. extension cable is available. See Microphone connection.
Real-ear verification of FM-only open fittings in Speechmap (based on AAA Clinical Practice Guidelines:
Remote Microphone Hearing Assistance Technologies for Children and Youth from Birth to 21 Years. April
2008)
Open fittings must be verified in On-ear mode.
1. Enter Audiometry data and select FM from the Instrument list box.
2. Position the transmitter microphone as in step 4 above. Place the probe tube in the ear canal and couple the
FM-only device to the ear canal as in normal use.
3. At maximum volume setting, select the MPO stimulus. Adjust the receiver settings to meet targets. See
Fitting to targets for loud sounds.
4. At use volume setting, select Speech-std(1), (2) or the ISTS and choose FM chest (84 dB SPL) or FM boom
(93 dB SPL) for the level. Adjust the FM receiver gain/volume settings to meet targets in the 1000 – 4000 Hz
range.
5. Repeat step 3 at use volume setting.
CROS fitting in Speechmap
See Using Speechmap.
1. Place a probe module on each ear and insert the probe tube into the good ear only. Position the CROS
instruments on (in) the ears and turn them ON.
2. Position the speaker at 45 degrees to the good ear and set Instrument to [BTE].
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