TYPE 4939

TYPE 4939
Standard	IEC 61094
Sound field	Free field
Polarization voltage	200V
Sensitivity	4 mV/Pa
Lower limiting frequency	4 Hz
Higher limiting frequency	100 kHz
Inherent noise	28 dB(A)
Upper limiting of dynamic range	164 dB
Diameter	1/2 inch
Venting	Side
Minimum Temperature	-40 °C
Maximum Temperature	150 °C
Minimum Temperature	-40 °F
Maximum Temperature	302 °F

A laser-welded, stainless-steel diaphragm ensures superior long-term stability and mechanical robustness. Type 4939 will withstand the 1 m drop test required by IEC 60068-2-32.

The microphone is assembled in a clean room, ensuring that the microphones maintain their inherent noise floor and high stability, even when used in environments with a combination of high humidity and high temperature.

Type 4939 is available in a TEDS Microphone set with different variants of classical preamplifiers. The TEDS microphone is considered one unit and has been sealed in a clean environment.

The TEDS is programmed with the loaded sensitivity of the actual cartridge and the data is therefore readily available in the transducer. The default TEDS template is according to IEEE P1451.4 but TEDS to IEEE 1451.4 is available on request.

The sensitivity can be calibrated at 250 Hz by using Pistonphone Type 4228 with ¼-inch Adaptor DP 0775. The actuator response can be measured using Actuator UA 0033 with Adaptor DB 0264.

The free-field response can be obtained by adding the type-specific, free-field correction to the actuator response.

Main Menu

Main Menu

Main Menu

Main Menu

TYPE 4939

MICROPHONE BUILD AND STABILITY

TEDS Microphones

CALIBRATION

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