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.

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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.

Capacitance
pF
Diameter
1
Dynamic range
10.2 – 146 dB
Frequency range
– Hz
Inherent noise
dB A
Lower limiting frequency -3dB
Hz
Polarization voltages
V
Pressure coefficient
dB/kPa
Sensitivity
mV/Pa
Temperature coefficient
db/ºC
Temperature range
– C
Weight
gram