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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.

TYPE 4145

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Type 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.

1-inch Free-field Microphone - Type 4145

Data Sheets

English

TYPE 4145
Standard	IEC 61094
Sound field	Free field
Polarization voltage	200V
Sensitivity	50 mV/Pa
Lower limiting frequency	2.6 Hz
Higher limiting frequency	18 kHz
Inherent noise	10 dB(A)
Upper limiting of dynamic range	146 dB
Diameter	1 inch
Venting	Rear
Minimum Temperature	-30 °C
Maximum Temperature	100 °C
Minimum Temperature	-22 °F
Maximum Temperature	212 °F

Product Code	Description
UA-0207---	Windscreen for 1"Mic, 90mm Diameter

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