Type 4188 is designed for free-field measurements where an economy microphone with medium sensitivity is required. Being prepolarized, Type 4188 can be used with both CCLD and classical preamplifiers.

Use Scenarios

• Medium class sound level meters
• Equipment complying with IEC 61672 class 1
• Random-incidence measurements
• Portable sound measuring equipment
• Being prepolarized, Type 4188 is especially well suited for battery-operated equipment or for operation in environments with high humidity.

Specifications

• Capacitance: 12 pF
• Diameter: 1/2
• Dynamic range: 15.8 – 146 dB
• Frequency range: 8 – 12500 Hz
• Inherent noise: 14.2 dB A
• Lower limiting frequency -3dB: 5 Hz
• Optimized: Free field
• Pressure coefficient: -0.021 dB/kPa
• Sensitivity: 31.6 mV/Pa
• Sound field: Free-field

These microphones are "new" in the original package accompanied with mfg Calibration Data Sheet.