Back to Electroacoustic Test Accessories Ear Simulator/Coupler 
ZT-319 Ear simulator/coupler
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Description
ZT-319 is a kind of coupled cavity with the volume of 2 cc in accordance with IEC 60318-5. It can be adapted to 1/2'' pressure-field measurement microphones according to IEC 61094-4 (WS2P), such as ZT-372 measurement microphones. Hearing aids and headphones for air conduction are connected to the coupled cavity by ear inserts (e.g. ear molds or similar devices). The coupler has a resonant frequency of 22.4 kHz to avoid interference with measurements within the audible frequency range. This coupled cavity kit has a built-in ZT-372 measurement microphone with the sensitivity of 12.5 mV/Pa and the noise floor of 20 dB (A).
Specifications
ZY-319 Ear Simulator / Coupled CavityApplicable Standards IEC 60318-5
Frequency Response (FR) 125Hz～8kHz
Sensitivity ±2 dB 12.5mV/Pa
Sensitivity ±2 dB -38dB re 1V/Pa
Polarization voltage 0V(pre-polarization)
Upper limit of dynamic range (re 20 uPa) 160dB
Lower limit of dynamic range (re 20uPa) 20dB(A)
Operating temperature -30℃～80℃
Temperature coefficient (-10 ℃ - 50 ℃) 0.005dB/℃
Relative humidity range 0～90% (without condensation)
Power Supply of Preamplifier IEPE (2～10mA)
Connection Mode of Preamplifier SMB coaxial plug
Optional ItemsMicrophone ZT-372/332
Preamplifier ZT-510 (IEPE, SMB)
Applications
Hearing aid testingInsert earphone measurement