Type 4193 is specially designed for infrasound measurement. Being external polarized, Type 4193 must be used with a classical preamplifier.
Used with adaptor UC-0211, the lower limiting frequency of the preamplifier is reduced to 0.1 Hz.
- Infrasound measurements
- Sonic boom measurements
- General pressure field measurements
- Sensitivity: 12.5 mV/Pa
- Frequency: 0.07 Hz – 20 kHz
- Dynamic range: 19 – 162 dB
- Temperature: – 30 to + 300°C (– 22 to + 572°F)
- Polarization: 200 V
Use of pressure-field microphones
Pressure-field microphones are optimised to have a flat frequency response in a pressure field. Pressure-field microphones should be used for making measurements in small, closed couplers or close to hard, reflective surfaces.
Type 4193 is suited for situations where a robust and stable pressure-field microphone is required. Due to its extremely low cut-off frequency, Type 4193 is especially well suited for infrasound measurements.
Manufacturing and stability
A press-fitted, stainless-steel diaphragm ensure superior long-term stability and mechanical robustness – Type 4193 will withstand the 1 m drop test of IEC 60068 – 2 – 32.
All Brüel & Kjær Measuring Microphones are assembled in a clean room. This ensures that the microphones maintain their inherent low noise floor and high stability, even when used in environments with a combination of high humidity and high temperature.
Type 4193 requires an external polarization voltage and must therefore must be used with a classical preamplifier. External polarized microphones may be used at higher temperatures without severe changes in sensitivity.
Type 4193 is available in TEDS combinations with the classical Preamplifier Type 2669. 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. The default TEDS template is to IEEE P 1451.4 but TEDS to IEEE 1451.4 is available on request.
Individual calibration data
Each Type 4193 comes with an individual calibration chart including information about the open-circuit sensitivity and frequency response in a pressure field.