Chapter : User’s Guide
20
APx1701 Transducer Test Interface: User’s Guide
phones in the fixture, and connect them to the APx1701.
See Microphone Connections on page 16.
In the APx500 software, set the Signal Path I/O to Trans-
ducer Interface, and run the Acoustic Response measure-
ment. You will see a number of results, including frequency
response, group delay and rub-and-buzz.
Headphones often have impedance curves that do not relate
well to Thiele-Small models, and do not provide conven-
tional impedance results. However, in production quality
assurance, the impedance test can reveal TRS jack fatigue
or failure, often a problem in a busy production environ-
ment.
The higher impedance of headphones can result in noisy
impedance curves. You can smooth such curves using the
Smooth Derived Result in APx500.
Comparing two microphones
Simplified diagram
for testing a professional microphone
in comparison to a measurement microphone.
Conveniently mount a full-range loudspeaker, and connect
it to the APx1701 amplifier output channel 1 (pins 1+ and
1– on the SpeakON connector). See Amplifier Output Con-
nections on page 15. Mount the microphone to be tested
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