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FP35 Audiometer Option

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An audiometer option is available with the FP35 that allows threshold tests from 250 Hz to 8000 Hz, with amplitudes of from 10 to 110 dB HL in the mid-frequency range with insert earphones. The use of a sound field speaker is also available. (Masking is not available.) The audiometer option is available with either one or two ER3A insert earphones. The ER3A comes with three sizes of foam eartips.

Combined with the real ear hearing aid analysis capability of the FP35, the audiometer option allows nearly automatic collection of Real Ear to Coupler Difference (RECD) and Real Ear to Dial Difference (REDD) information. This data can be very useful when fitting hearing aids on infants and other hard-of-hearing persons. One real ear test establishes the RECD/REDD, and then the aid adjustment and verification can be carried out in the 2CC coupler mode, enhancing patient comfort.

Audiometer specifications:

ANSI S6 type 5

Available output levels:

Er3A:

 

Frequency (Hz) Amplitude range (dB HL)
250 10 to 95
500 10 to 100
750 10 to 110
1000 10 to 110
1500 10 to 110
2000 10 to 110
3000 10 to 110
4000 10 to 100
6000 10 to 90
8000 10 to 75

 

Sound field speaker:

All frequencies: 40 to 90 dB SPL

Converted to audiometric RETSPL and the angle of presentation, the following dB corrections are used:

Frequency (Hz) SF, 0 degrees SF, 45 degrees
250 13.0 12.0
500 6.0 3.0
750 4.0 0.5
1000 4.0 0.0
1500 2.5 -0.1
2000 0.5 -2.5
3000 -4.0 -9.0
4000 -4.5 -8.5
6000 4.5 -3.0
8000 13.5 8.0

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