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½" Free-Field Microphone, Infra-Sound Type 40AZ
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½" Free-Field Microphone, Infra-Sound Type 40AZ
Product catalog summary
Product Overview
The G.R.A.S. ½" free-field microphone Type 40AZ is a precision condenser microphone designed for low-frequency and infra-sound measurements in open acoustic fields. It is prepolarized and offers a large dynamic range with a wide frequency response.
The G.R.A.S. ½" free-field microphone Type 40AZ is a precision condenser microphone designed for low-frequency and infra-sound measurements in open acoustic fields. It is prepolarized and offers a large dynamic range with a wide frequency response.
Typical Applications
- Precision acoustic measurements
- Type 0 and 1 SPL measurements
- Free-field measurements
- Low-frequency measurements
- Infra-sound measurements
Specifications
- Frequency response: 0.5 Hz - 20 kHz (± 2.0 dB), 1 Hz - 10 kHz (± 1.0 dB)
- Resonant frequency: 4 kHz (90° phase shift)
- Nominal sensitivity at 250 Hz: 50 mV/Pa
- Polarization voltage: 0 V
- Dynamic range: Upper limit 146 dB re. 20 μPa
- Microphone thermal noise: 14 dB re. 20 μPa
- Capacitance: 20 pF
Design and Compatibility
The microphone is compatible with the G.R.A.S. ¼" high impedance preamplifier Type 26CG. It features a mounting thread compatible with WS2P/F microphone preamplifiers. The microphone is constructed from non-corrosive, stainless materials for durability in harsh environments.
The microphone is compatible with the G.R.A.S. ¼" high impedance preamplifier Type 26CG. It features a mounting thread compatible with WS2P/F microphone preamplifiers. The microphone is constructed from non-corrosive, stainless materials for durability in harsh environments.
Compliance and Warranty
All G.R.A.S. microphones comply with IEC 1094 standards for measurement microphones. They are guaranteed for 5 years and come with individual calibration charts.
All G.R.A.S. microphones comply with IEC 1094 standards for measurement microphones. They are guaranteed for 5 years and come with individual calibration charts.
Physical Dimensions
- Length with protection grid: 16.2 mm; without: 15.3 mm
- Diameter with protection grid: 13.2 mm; without: 12.7 mm
- Weight: 9 g (0.32 oz)
Environmental Specifications
- Temperature range: –40 °C to +70 °C
- Humidity range: 0–100% RH (non-condensing)
- Venting: Rear-vented
Performance Characteristics
The microphone is designed to minimize the effects of its presence in the sound field at low frequencies. At higher frequencies, diffraction effects are compensated to ensure a flat frequency response for 0º incidence. Figures provided illustrate frequency response and corrections for various angles of incidence.
The microphone is designed to minimize the effects of its presence in the sound field at low frequencies. At higher frequencies, diffraction effects are compensated to ensure a flat frequency response for 0º incidence. Figures provided illustrate frequency response and corrections for various angles of incidence.
See more
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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.