TYPE 4988-A

¼-inch pressure-field TEDS microphone

Designed to be used in small closed couplers, close to hard reflective surfaces, close to sound ports or flush-mounted.

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Microphone Type 4988-A is a ¼" prepolarized pressure-field microphone laser welded to ¼" CCLD preamplifier. The preamplifier connects to CCLD input conditioning and supports IEEEP1451.4 V1.0  Transducer Electronic Data Sheet (TEDS).

It is an all-titanium design that ensures maximum resistance to corrosion and minimum sensitivity to magnetic fields.

USE SCENARIOS

  • Measurements requiring an EN/IEC 61326 EMC compliant product
  • Measurements very close to sound ports of an audio device (near field)
  • Measurements in small acoustic chambers and test boxes where reflections occur
  • Measurements in unpredictable sound field conditions
  • Flush mounting
  • Production tests systems
  • Inside an acoustic coupler (pressure field)
  • Reference microphone for tuning of microphone arrays and active noise-cancelling systems
Capacitance
pF
Diameter
1/4
Dynamic range
29 – 146 dB
Frequency range
20 – 20000 Hz
Inherent noise
29 dB A
Lower limiting frequency -3dB
6 Hz
Optimised
Pressure Field
Polarization
Prepolarized
Polarization voltages
V
Pressure coefficient
-0.0015 dB/kPa
Sensitivity
11 mV/Pa
Temperature coefficient
0.015 db/ºC
Temperature range
-20 – 80 C
Venting
Rear
Weight
gram
Sound field
Pressure-field
Input type
CCLD IEPE
Microphone type
Pressure Field