1/4“ Druckfeldmikrofon, extern polarisiert
Mikrofon für Messungen mit hohem Pegel und hoher Frequenz im Frequenzbereich von 4 Hz bis 70 kHz.
Das Mikrofone Typ 4938 (¼ Zoll) ist für Messungen mit hohem Pegel und hoher Frequenz ausgelegt. Das Mikrofon ist so konstruiert, dass es rauer Behandlung und hohen Temperaturen bis zu 300 °C (572 °F) standhält.
| 1/4'' Pressure-field Microphone Type 4938 | Datenblätter | English |
| TEDS Microphones | Datenblätter | English |
| TEDS Microphones | Datenblätter | Japanese |
| Standard | IEC 61094 |
| Sound field | Pressure field |
| Polarization voltage | 200V |
| Sensitivity | 1.6 mV/Pa |
| Lower limiting frequency | 4 Hz |
| Higher limiting frequency | 70 kHz |
| Inherent noise | 30 dB(A) |
| Upper limiting of dynamic range | 172 dB |
| Diameter | 1/4 inch |
| Venting | Side |
| Minimum Temperature | -40 °C |
| Maximum Temperature | 300 °C |
| Minimum Temperature | -40 °F |
| Maximum Temperature | 572 °F |
The shape of the microphone front ensures excellent microphone performance when flush-mounted and the laser-welded diaphragm on the microphone housing ensures that the sensitivity is resistant to rough handling during flush mounting. The robustness of the microphone makes it capable of withstanding the IEC 68-2-32 1 metre drop.
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.