Audioscan Verifit 2 Bedienungsanleitung PDF herunterladen (Seite 103)

Verifit

User's Guide Version 4.2 © June 2015

provided in ANSI S3.22.

1. Click the right mouse button to raise the home menu, then select [Input/Output].

2. Refer to Coupling the hearing instrument and Positioning the hearing instrument to prepare the instrument

for testing.

3. Turn the instrument ON; set AGC controls or programming parameters as in ANSI 1996 Linear and AGC

tests or ANSI 2003 Linear and AGC tests

4. Click[Curve 1]. Test setup instructions will be displayed.

5. Press to generate a set of 5 input/output curves.

6. To measure another set of 5 input/output curves, click another [Curve #].

7. To summon a cursor to determine curve values, position the mouse pointer on a graph area and click the left

mouse button. Click again to turn it off.

NOTE: Noise in the test area may cause erroneous results at low input levels (particularly at 250 and 500 Hz).

Ensure that the test box is well sealed and ambient noise is low.

ANSI telecoil terminology

The Verifit test chamber contains an integrated telephone magnetic field simulator (TMFS) and a telecoil test

loop, meeting the requirements of ANSI S3.22, that enable the measurement of coupler SPL produced by a

hearing instrument with a telephone pickup coil. ANSI uses the following terms in telecoil testing:

RTG (reference test gain) is the average gain measured with the gain control in the reference test position

(1996) or reference test setting (2003). See ANSI S3.22-1996 facts and ANSI S3.22-2003 facts.

TMFS (Telephone magnetic field simulator). A 38.4-mm diameter coil spaced 16.5 mm below a test surfaced

driven by a specified test signal. Intended to simulate a telephone handset receiver.

SPLITS (Coupler SPL for an inductive telephone simulator). SPL developed in a 2cc coupler by a hearing

instrument with the gain control in the RTP (1996) or RTS (2003) when the input is the magnetic field generated

by a TMFS.

HFA (or SPA) –SPLITS. Average of the SPLITS at HFA or SPA frequencies.

STS (1996 - simulated telephone sensitivity) or RSETS (2003 - relative simulated equivalent telephone

sensitivity) is calculated as HFA (or SPA) SPLITS minus (RTG + 60). A positive STS or RSETS indicates

greater output when using the telephone than when using the microphone.

SPLIV (Coupler SPL in a vertical magnetic field). SPL developed in a 2cc coupler by a hearing instrument,

positioned as worn, with the user gain control in the RTP (1996) or RTS (2003) when the input is a 31.6 mA/m

vertical magnetic field.

HFA (or SPA) – SPLIV. Average of the SPLITS at HFA or SPA frequencies.

TLS (1996 - test loop sensitivity) or RTLS (2003 - relative test loop sensitivity) is calculated as HFA (or SPA)

SPLIV minus (RTG + 60). A positive TLS indicates greater output when listening in a room loop than when

using the microphone.

ANSI telephone simulator (TMFS) test

WARNING: The included magnet may effect some medical or electronic devices. Keep magnet at least 5cm

(2in.) from implantable devices and other magnetically sensitive devices.

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Audioscan Verifit 2 Bedienungsanleitung Seite 103