HP RM500SL manual FastFacts 8.8 Ansi telecoil terminology

8.8ANSI telecoil terminology

The RM500SL test chamber contains an integrated telephone magnetic field simulator (TMFS) 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 8.2: ANSI S3.22-1996 facts and 8.3: ANSI S3.22-2003 facts.

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

mmbelow 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.

FastFacts 8.8: ANSI telecoil terminology

0611 RM500SL User’s Guide Version 2.8 Page 43