Microphone & PreAmplifier Combinations
Type 4938-A-011 ¼-Inch Pressure-Field Microphone With Type 2670 Preamplifier, 4 HZ TO 70 KHZ, 200 V Polarization
Type 4938-A-011 is designed for high-frequency measurements. By using new materials and a new way of mounting the diaphragm, the microphone is geared to withstand rough handling and high temperatures of up to 300°C (572°F).
USE SCENARIOS
- High temperature measurements
- High level measurements
- High frequency measurements
- Flush mounting
THIS MICROPHONE IS A FACTORY.ASSEMBLED COMBINATION OF:
- Microphone: Type 4938
- Preamplifier: Type 2670
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: 42 – 172 dB
Frequency range: 4 – 70000 Hz
Inherent noise: 42 dB A
Lower limiting frequency -3dB: 4 Hz
Optimised: Pressure Field
Polarization: Ext polarized
Polarization voltages: 200 V
Pressure coefficient: -0.003 dB/kPa
Sensitivity: 1.4 mV/Pa
Standards: IEC 61094-4 WS3P
Temperature coefficient: 0.003 db/ºC
Temperature range: -20 – 80 C
Venting: Side
Weight: gram
Sound field: Pressure-field
Input type: Classic
Microphone type: Pressure Field
