TYPE 4950

½-inch free-field microphone, 6.5 Hz to 16 kHz, prepolarized

Economy microphone designed for equipment intended for accurate and reliable sound measurements in accordance with IEC 61672 Class 1 and ANSI S 1.4 Type 1.

Request a quote

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.

USE SCENARIOS

  • 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.

Capacitance
12.5 pF
Diameter
1/2
Dynamic range
15 – 142 dB
Frequency range
6.5 – 16000 Hz
Inherent noise
15 dB A
Lower limiting frequency -3dB
5 Hz
Optimised
Free field
Polarization
Prepolarized
Polarization voltages
V
Pressure coefficient
-0.02 dB/kPa
Sensitivity
50 mV/Pa
Temperature coefficient
0.005 db/ºC
Temperature range
-30 – 100 C
Venting
Rear
Weight
gram
Sound field
Free-field
Microphone type
Free field