TYPE 4944-A

1/4" Pressure-field Microphone With CCLD DeltaTron Preamplifier

Pressure-field Microphone for measuring in small closed couplers, close to hard reflective surfaces or flush-mounted, with a frequency response of 16 Hz To 70 kHz.

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Type 4944-A is designed to be used in small closed couplers, close to hard reflective surfaces or flush mounted. It is a ¼-inch prepolarized pressure-field microphones laser welded to ¼-inch CCLD preamplifiers. The preamplifier connects to CCLD input conditioning and supports IEEEP1451.4V 0.9 TEDS (Transducer Electronic Data Sheet).

USE SCENARIOS

  • High-level measurements
  • High-frequency measurements
  • Flush mounting
  • Arrays in wind tunnels

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.

MICROPHONE DATA CD

The microphone is supplied with a mini-CD. This mini-CD carries all individual calibration data as well as random-incidence and free-field corrections. The influence of ¼-inch Nose Cone UA-0385 is also available.

CALIBRATION

The sensitivity can be calibrated at 250 Hz using Pistonphone Type 4228 with ¼-inch 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
pF
Diameter
1/4
Dyn. range
48 – 169 dB
Freq. range
16 – 70000 Hz
Inherent noise
48 dB A
Lower limiting frequency -3dB
16 Hz
Optimised
Pressure Field
Polarization
Prepolarized
Polarization voltages
V
Pressure coefficient
-0.003 dB/kPa
Sensitivity
0.9 mV/Pa
Temperature coefficient
0.009 dB/ºC
Temperature range
-20 – 100 ℃
Venting
Side
Weight
gram
Sound field
Pressure-field
Input type
CCLD IEPE
Microphone type
Pressure Field