TYPE 4145
1" Free-field Microphone, Ext. Polarized
Free-field microphone for low-level, laboratory, and sound pressure measurements (IEC 61672 Class 1) over a frequency range of 2.6 Hz To 18 kHz.
Request PriceType 4145 is a 1-inch free-field microphone designed for low-level and laboratory free-field measurements. The specifications of Type 4145 also make it suitable for sound pressure measurements in accordance with IEC 61672 Class 1.
When fitted with Random Incidence Corrector UA-0055, Type 4145 can also be used for random-incidence measurements.
USE SCENARIOS
- Low-level measurements
- Laboratory measurements
- Complies with IEC 61094 – 4 WS1F
CALIBRATION
The sensitivity of Type 4145 can be calibrated at 250 Hz using Pistonphone Type 4228, or at 1 kHz using Sound Level Calibrator Type 4231.
The pressure-field response can be measured using Electrostatic Actuator UA 0023.
- Capacitance
- pF
- Diameter
- 1
- Dyn. range
- 10.2 – 146 dB
- Freq. range
- – Hz
- Inherent noise
- dB A
- Lower limiting frequency -3dB
- Hz
- Optimised
- Free field
- Polarization
- Ext polarized
- Polarization voltages
- V
- Pressure coefficient
- dB/kPa
- Sensitivity
- mV/Pa
- Temperature coefficient
- db/ºC
- Temperature range
- – C
- Weight
- gram