1/8"-DRUCKFELDMIKROFON, EXTERN POLARISIERT
Druckfeldmikrofon für sehr hochfrequente Messungen auf engstem Raum mit einem Frequenzbereich von 6,5 Hz bis 140 kHz.
TYPE 4138
Der Typ 4138 ist für Messungen mit hoher und sehr hoher Frequenz sowie für Messungen auf engstem Raum konzipiert. Da der Typ 4138 extern polarisiert ist, muss er mit einem klassischen Vorverstärker verwendet werden.
| 1/8-inch Pressure-field Microphone Type 4138 | Data Sheets | English |
| Standard | IEC 61094 |
| Sound field | Pressure field |
| Polarization voltage | 200V |
| Sensitivity | 1 mV/Pa |
| Lower limiting frequency | 6.5 Hz |
| Higher limiting frequency | 140 kHz |
| Inherent noise | 43 dB(A) |
| Upper limiting of dynamic range | 168 dB |
| Diameter | 1/8 inch |
| Venting | Side |
| Minimum Temperature | -30 °C |
| Maximum Temperature | 100 °C |
| Minimum Temperature | -22 °F |
| Maximum Temperature | 212 °F |
Pressure-field microphones should be used for making measurements in small, closed couplers or close to hard, reflective surfaces. Such microphones are optimised to have a flat frequency response in a pressure field. Because of its small size, Type 4138 can also be used for random-incidence measurements at audio frequencies, where its frequency response is less dependent on angle of incidence.
Type 4138 requires an external polarization voltage and therefore must be used with a classical preamplifier such as Brüel & Kjær Type 2670 together with 1/8-inch to 1/4-inch Adaptor UA-0160.
The sensitivity of Type 4138 can be calibrated at 250 Hz using Pistonphone Type 4228, or at 1 kHz using Sound Calibrator Type 4231, in both cases using Adaptor DP-0774.
The pressure-field response can be measured using Electrostatic Actuator UA-0033 with Actuator Adaptor DB-0900.
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This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, MicroStrain and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.