½-inch Wide-frequency, Pressure Microphone Type 40AO

Product catalog summary

Product Overview: The G.R.A.S. ½-inch Wide-frequency, Pressure Microphone Type 40AO is a precision reference microphone designed for laboratory use, including applications in couplers, ear simulators, and enclosures. It is a prepolarized pressure microphone known for its large dynamic range and extended frequency response.

Specifications:

Frequency Response: 3.15 Hz to 20 kHz (± 2.0 dB), 5 Hz to 12.5 kHz (± 1.0 dB)
Nominal Sensitivity: 12.5 mV/Pa
Polarization Voltage: 0 V
Dynamic Range: Upper limit of 160 dB re. 20 µPa with 1% distortion
Microphone Thermal Noise: 20 dBA re. 20 µPa
Capacitance: 20 pF
Temperature Range: -40 °C to +150 °C
Dimensions: Length with protection grid: 12.5 mm, Diameter: 13.2 mm
Weight: 7 g

Materials and Durability: Constructed from non-corrosive, stainless materials to withstand rough handling and corrosive environments. Guaranteed for 5 years with individual calibration charts provided.

Compliance and Standards: Complies with IEC 1094: Measurement Microphones, Part 4 specifications for working standard microphones.

Applications: Suitable for precision sound pressure measurements, very high frequency measurements, laboratory reference measurements, and use in couplers and ear simulators.

Additional Features: Compatible with G.R.A.S. CCP preamplifiers, including ½-inch Preamplifier Type 26CA and ¼-inch Preamplifier Type 26CB with adaptor GR0010.

Figures and Corrections: Includes figures showing typical frequency response and free-field corrections for various angles of incidence.