TYPE 4944

¼-inch pressure-field microphone 4 Hz to 70 kHz prepolarized

Designed for high-level and high-frequency measurements.

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Type 4944 is a ¼" Prepolarized Pressure-field Microphone.

USE SCENARIOS

  • High-level measurements
  • High-frequency measurements
  • Flush mounting
  • In small closed couplers, close to hard reflective surfaces or flush-mounted
  • The sensitivity has been optimised to allow measurements of high sound pressure levels without clipping in the built-in CCLD preamplifier.

DESIGN AND ROBUSTNESS

The shape of the microphone front ensures excellent microphone performance when flush-mounted. The laser-welded diaphragm on the microphone housing ensures that the sensitivity is resistant to rough handling during flush mounting.

CALIBRATION

The sensitivity can be calibrated at 250 Hz using Pistonphone Type 4228 with ¼" Adaptor DP-0775. The pressure-field response can be measured using Actuator UA- 0033 with Adaptor DB-0264. The pressure-field response is equal to the actuator response.

Capacitance
5 pF
Diameter
1/4
Dynamic range
46 – 170 dB
Frequency range
4 – 70000 Hz
Inherent noise
30 dB A
Lower limiting frequency -3dB
3 Hz
Optimised
Pressure Field
Polarization
Prepolarized
Polarization voltages
V
Pressure coefficient
-0.003 dB/kPa
Sensitivity
0.9 mV/Pa
Standards
IEC 61094-4 WS3P
Temperature coefficient
0.008 db/ºC
Temperature range
-40 – 150 C
Venting
Side
Weight
gram
Sound field
Pressure-field
Microphone type
Pressure Field