FAMILY 4939

1/4" FREE-FIELD MICROPHONE, EXT. POLARIZED

Free-field microphone designed for high-level and high-frequency measurements over a frequency range of 4 Hz to 100 kHz.

FAMILY 4939

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Using stainless steel diaphragm and protection grid, Type 4939 Microphone is built to withstand rough environments and can be used in high-temperature measurements up to 150°C (302°F).

The microphone requires an external polarization voltage and must therefore be used with a classical preamplifier. Externally polarized microphones can be used at higher temperatures without severe changes in measurement sensitivity.

High-level measurements
High-frequency measurements
Model work

Code	Sensitivity
-4939-A-011-	4 mV/Pa
-4939-C-002-	3.5 mV/Pa
-4939-L-002-	3.5 mV/Pa

TEDS Microphones

Data Sheets

English

FAMILY 4939
Standard	IEC 61094
Sound field	Free field
Polarization	Classical
Sensitivity	3.5 mV/Pa, 4 mV/Pa
Lower frequency	4 Hz
Higher frequency	100 kHz
Lower dynamic range	35 dB
Higher dynamic range	164 dB
Diameter	1/4 inch
Venting	Side
Minimum Temperature	-20 °C
Maximum Temperature	80 °C
Minimum Temperature	-4 °F
Maximum Temperature	176 °F
Output signal (connectivity)	Passive

List of accessories available for all variants of this family

Product Code	Description
-4294---	Calibrator Accel, Hand-Held, by Battery
JJ-0032---	Adaptor 10-32 UNF(F) to 10-32 UNF(F)
JP-0162---	Adaptor TNC(M) to 10-32 UNF(F) str.
UA-1075---	Mounting Magnet Set, 5x M3, D10mm
DB-0757---	Cement Stud M3, D8mm, Single Unit
UA-1216---	Accessories, Insulated Studs, M3 to M3,
YQ-2003---	Screw M3 x 5mm, DIN 916
YQ-2007---	Screw M3 x 8mm, DIN 916
QA-0041---	Thread Tap, M3, HHS ISO 529, 3x0.5
QA-0042---	Hex Key 2.5mm for Metric Socket Screws
YJ-0216---	Micro Wax 3971, white, for Accel
QS-0007---	Adhesive,SuperFastInstant,cyanoacrylate

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THIS MICROPHONE SET IS A COMBINATION OF:

The unit is assembled in a clean-room environment and sealed together, after which it is assigned one single type number and one single serial number. This means that the combined unit has better precision and long-time stability, and is handled as one complete unit.

The unit also contains TEDS, which means that information about the serial number, type and sensitivity is stored within it.

THE BENEFITS OF USING A MICROPHONE-PREAMPLIFIER COMBINATION ARE:

Better stability and precision. Because the unit is assembled in clean-room facilities, there is no contamination.
Ease of use. Your analyzer front-end and software will automatically detect the type number, serial number and sensitivity because of the built-in TEDS technology. There is no need to enter this manually for every channel.
Calibration integration. The TEDS technology means the microphone is automatically detected and identified by your data acquisition software, allowing it to be easily integrated with your calibration database.
Fewer errors. As your data acquisition software automatically knows the microphone type, serial number and sensitivity, manual inputs are greatly reduced – reducing human errors.

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