G.R.A.S. Sound & Vibration
Free Field Microphone
1/2” Free field, Prepolarized Type 40AE
| A general purpose microphone, similar to type 40AF, but as an electret condenser type and hence requires no external polarization voltage. They are typically used with ICP preamplifiers, type 1 sound level meters or for other less critical measurements. |
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| Sensitivity: | 50 mV/Pa |
| Frequency range: | 3.15-20kHz |
| Dynamic range: | 15-146 dB re. 2*10-5 Pa |
| Polarization voltage: | 0 V |
| Outside diameter (with protection grid) |
13.2 mm |
1/2” Free field, High sensitivity Type 40AF
| A general purpose microphone, covering the frequency range from 3.15 Hz to 20 kHz. Due to the high sensitivity, the microphone can measure sound pressure levels down to 15 dB(A).The microphone is intended for type 0 and type 1 measurements according to IEC 60651 standard. |
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| Sensitivity: | 50 mV/Pa |
| Frequency range: | 3.15-20kHz |
| Dynamic range: | 15-146 dB re. 2*10-5 Pa |
| Polarization voltage: | 200 V |
| Outside diameter (with protection grid) |
13.2 mm |
Array Microphone
1/2” Array Microphone Type 40AT
| The Array Microphone type 40AT is a small, compact unit for sound pressure measurement. The unit consists of a 1/2” prepolarized free field measurement microphone and a built-in preamplifier. The unit is intended for use in multi- channel measurements systems with high demands for precision and stability. The Array microphone can be connected to any standard microphone input and requires only a supply voltage of 5-36 VDC. The high sensitivity of the microphone ensures a wide dynamic range and enables accurate measurements of very low sound pressure levels. |
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| Sensitivity at 250 Hz | 40 mV/Pa nominal |
| Dynamic range: | Lower limit: <29 dB(A) re. 2*10-5 Pa Lower limit: <40 dB Lin re. 2*10-5 Pa Upper limit: >145 dB peak with 35 V Supply Upper limit: >128 dB peak with 5 V Supply |
| Frequency response: | 20 Hz - 10 kHz : ± 1 dB |
| Electrical Output Impedance: | < 50Ω |
| Noise (Typical): | 100 µV Lin. 20 Hz-10 kHz 25 µV A-weighted |
| Weight: | 40 g |
