½-inch Free-field Microphone, Prepolarized (IEC 6172 Class 1)
Free-field microphone designed for accurate sound measurements (IEC 61672 Class 1 and ANSI S 1.4 Type 1) over a frequency range of 6.5 Hz to 16 kHz.問い合わせ・見積依頼
This prepolarized, free-field ½-inch microphone is specially designed for equipment intended for accurate and reliable sound measurements in accordance with IEC 61672 Class 1 and ANSI S 1.4 Type 1.
- Sound measurements according to IEC 61672 and ANSI S 1.4 – 1983
- Cost-effective sound measurements
- ideal for cost-effective, portable instruments intended for use under different conditions including humid and polluted atmospheres.
½-inch Free-field Microphone Type 4950 is a prepolarized condenser microphone, designed for accurate and reliable sound measurements as required for sound level meters in accordance with IEC 61672 Class 1 and ANSI S 1.4 Type 1.
The use of a stainless-steel, press-fit mounted diaphragm guarantees both robustness and corrosion resistance. The microphone is fitted with a removable protection grid. It does not need an external polarization voltage, thus eliminating the need for cumbersome high-voltage DC supplies and at the same time enabling the use of inexpensive 2-wire system (CCLD) input.
The microphone is rear-vented in order to balance out the static pressure; the venting also determines the lower limiting frequency. Type 4950 comes with a calibration chart showing typical frequency response and individual sensitivity value.
- 12.5 pF
- Dyn. range
- 15 – 142 dB
- Freq. range
- 6.5 – 16000 Hz
- Inherent noise
- 15 dB A
- Lower limiting frequency -3dB
- 5 Hz
- Free field
- Polarization voltages
- Pressure coefficient
- -0.02 dB/kPa
- 50 mV/Pa
- Temperature coefficient
- 0.005 dB/ºC
- Temperature range
- -30 – 100 ℃
- Sound field
- Microphone type
- Free field