TYPE 4188-A-021

½-inch Free-field Microphone With Type 2671 Preamplifier, Prepolarized

Free-field microphone for transport noise measurements, architectural acoustics, and electroacoustic applications between 8 Hz to 12.5 kHz.

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Type 4188-A-021 is designed for free-field measurements where an economy microphone with medium sensitivity is required.

USE SCENARIOS

  • Medium class sound level meters
  • Equipment complying with IEC 61672 class 1
  • Random-incidence measurements
  • Portable sound measuring equipment

THIS MICROPHONE SET IS A COMBINATION OF:

The unit is assembled in a clean-room environment and sealed together, after which it is assigned one single type number and one single serial number. This means that the combined unit has better precision and long-time stability, and is handled as one complete unit.

The unit also contains TEDS, which means that information about the serial number, type and sensitivity is stored within it.

THE BENEFITS OF USING A MICROPHONE-PREAMPLIFIER COMBINATION ARE:

  • Better stability and precision. Because the unit is assembled in clean-room facilities, there is no contamination.
  • Ease of use. Your analyzer front-end and software will automatically detect the type number, serial number and sensitivity because of the built-in TEDS technology. There is no need to enter this manually for every channel. 
  • Calibration integration. The TEDS technology means the microphone is automatically detected and identified by your data acquisition software, allowing it to be easily integrated with your calibration database.
  • Fewer errors. As your data acquisition software automatically knows the microphone type, serial number and sensitivity, manual inputs are greatly reduced – reducing human errors.
Capacitance
pF
Diameter
1/2
Dyn. range
19 – 138 dB
Freq. range
20 – 12500 Hz
Inherent noise
19 dB A
Lower limiting frequency -3dB
12 Hz
Optimised
Free field
Polarization
Prepolarized
Polarization voltages
V
Pressure coefficient
-0.021 dB/kPa
Sensitivity
31.6 mV/Pa
Temperature coefficient
0.005 dB/ºC
Temperature range
-30 – 100 ℃
Venting
Rear
Weight
gram
Sound field
Free-field
Input type
CCLD IEPE
Microphone type
Free field