FONIX® 8000 - Frye Electronics
FONIX® 8000 - Frye Electronics
FONIX® 8000 - Frye Electronics
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196 FONIX <strong>8000</strong> Hearing Aid Analyzer<br />
8.9.3.1 CROS<br />
unaided—Measurement of “good” ear<br />
Set up the <strong>8000</strong> test system as follows.<br />
• Reference microphone ON<br />
• Sound field LEVELED<br />
• Reference microphone over pinna of<br />
bad ear<br />
• Probe microphone tube inside unoccluded<br />
ear canal of good ear<br />
• Loudspeaker at 0º, 12 inches from bridge of nose<br />
aided—Measurement of “good” ear<br />
Same setup as above, except:<br />
• Aid in place in good ear and set to user gain.<br />
The difference curve, labeled “Insertion Gain” on the screen, shows the overall<br />
benefit of inserting the hearing aid.<br />
8.9.3.2 BI-CROS<br />
unaided—Measurement of “better” ear<br />
Set up the <strong>8000</strong> test system as follows:<br />
• Reference microphone ON<br />
• Sound field LEVELED<br />
• Unaided response CUSTOM<br />
• Reference microphone over pinna of<br />
bad ear<br />
• Probe microphone tube inside unoccluded<br />
ear canal of better ear<br />
• Loudspeaker at 0º, 12 inches from bridge of nose<br />
aided—Measurement of “better” ear<br />
Same setup as above, except—<br />
• Complete aid in place in better ear and set at use gain<br />
• Both transmitters on<br />
GOOD<br />
EAR<br />
PROBE MIC 12"<br />
BETTER<br />
EAR<br />
PROBE MIC 12"<br />
SPEAKER<br />
SPEAKER<br />
BAD<br />
EAR<br />
REFERENCE MIC<br />
BAD<br />
EAR<br />
REFERENCE MIC<br />
The difference curve, labeled “Insertion Gain” on the screen, shows the overall<br />
benefit of inserting the hearing aid.
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