APx511 B Series Hearing Instrument Analyzer: Getting Started Guide 31
Getting Started Guide
Overview
The B Series APx511 is an analog-only audio analyzer with
connectivity and features specifically designed to test hear-
ing instruments. The front panel provides five LED indica-
tors, and the rear panel provides all the audio, control and
mains power connections, and the mains power switch.
Hearing instrument testing is typically accomplished using
a test chamber such as the Interacoustics TBS25. The cham-
ber is fitted with an internal loudspeaker and a telephone
magnetic field simulator (TMFS, or telecoil) for telecoil
stimulation, and provides a means of connection for a mea-
surement microphone / acoustic coupler combination and a
battery simulator, both provided by the user.
The APx511 has an internal 4 watt power amplifier to drive
the loudspeaker, a telecoil output, a powered microphone
input and DC connections for the battery simulator.
See the Installation chapter earlier in this booklet for infor-
mation about APx500 measurement software installation,
mains power connection, and fusing. See the Specifications
chapter for B Series APx511 performance characteristics.
Software control
The analyzer hardware runs under Audio Precision’s
APx500 measurement software. Although it is possible to
use the APx511 using the APx500 user interface, a more
typical use is to address the APx500 API using your
proprietary automation software, with APx500 running in
the background.
A .NET library of functions to perform and automate the
tests described in IEC60118-7 and ANSI S3.22 is provided,
with programming samples in LabVIEW, VB.NET and C#,
and a program to illustrate usage of the DLL. See page 41.
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