TYPE 4939-L-002

¼-inch free-field microphone with Type 2669-L Preamplifier, 4 Hz to 100 kHz, 200 V polarization

Designed for high-level and high-frequency measurements.

見積もり依頼

Type 4939-L-002 is designed for high-level and high-frequency measurements. By using stainless steel diaphragm and protection grid, the microphone is optimised to withstand rough environments and is capable of working at high temperatures up to 150°C (302°F).

USE SCENARIOS

  • High level measurements
  • High frequency measurements
  • Model work

THIS MICROPHONE IS A FACTORY-ASSEMBLED 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.
Capacitance
pF
Diameter
1/4
Dynamic range
35 – 164 dB
Frequency range
4 – 100000 Hz
Inherent noise
35 dB A
Lower limiting frequency -3dB
4 Hz
Optimised
Free field
Polarization
Ext polarized
Polarization voltages
200 V
Pressure coefficient
-0.007 dB/kPa
Sensitivity
3.5 mV/Pa
Standards
IEC 61094-4 WS3F
Temperature coefficient
0.003 db/ºC
Temperature range
-20 – 80 C
Venting
Side
Weight
gram
Sound field
Free-field
Input type
Classic
Microphone type
Free field