Specifications

APx511 Getting Started Guide 19
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Getting Started Guide
Overview
The APx511 is an analog-only audio analyzer with connec-
tivity and features specifically designed to test hearing
instruments. The front panel provides 5 LED indicators, 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 software installation, mains power connection
and fusing. See the Specifications chapter for a detailed list-
ing of the APx511 capabilities and characteristics.
Software control
The analyzer hardware runs under Audio Precision’s
APx500 measurement software. Although it is possible to
use the APx511 with the APx500 user interface, a more typ-
ical use is to address the APx500 API using proprietary
automation software, with APx500 running in the back-
ground.
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 29.