Ready to use Volume Velocity Sources incorporating special two-microphone design for precise, in situ measurement of volume velocity in real time. Suitable for a range of acoustic environments from enclosed condition close to tyres or engine components, or open conditions some distance from a reflecting surface.
Type 4250
Volume velocity sources (VVS) are used as ‘acoustical shakers’ to measure acoustic frequency response functions – sound pressure per unit volume velocity – typically in connection with noise source contribution analysis. Uniquely, HBK volume velocity sources use a special dual-microphone probe to measure accurate volume velocity directly in real time.
HBK 4250 wideband volume velocity sources cover the full acoustic frequency range with two powerful drivers to maximize signal-to-noise in real-world conditions, and three probes providing calibrated volume velocity in the low-, mid-
and high-frequency ranges.
The driver units are designed to handle real-world measurement scenarios with high transmission loss or background noise that cannot be reduced, such as in outdoor situations.
Built-in overload protection ensures robust performance.
When used with BK Connect® software, volume velocity is monitored and measured in real time. Vibro-acoustic frequency response functions – sound pressure per unit force – can be measured using the reciprocal method and acceleration per unit volume acceleration.
CAPABILITIES
Select filters:
| Code | Power | Lower frequency | Higher frequency | Sound pressure level |
|---|---|---|---|---|
| -4250-A-003- | 150 W | 16 Hz | 2 kHz | 115 dB |
| -4250-A-004- | 150 W | 16 Hz | 2 kHz | 115 dB |
| -4250-A-- | 150 W | 16 Hz | 2 kHz | 115 dB |
| -4250-B-003- | 130 W | 32 Hz | 8 kHz | 116 dB |
| -4250-B-- | 130 W | 32 Hz | 8 kHz | 116 dB |
| -4250-C-003- | 50 W | 100 Hz | 16 kHz | 108 dB |
| -4250-C-004- | 50 W | 100 Hz | 16 kHz | 108 dB |
| -4250-C-- | 50 W | 100 Hz | 16 kHz | 108 dB |
| -4250-D-- | 50 W | 100 Hz | 16 kHz | 108 dB |
| -4250-E-- | 50 W | 100 Hz | 16 kHz | 108 dB |
| Product Data: HBK 4250 Wideband Volume Velocity Sources (bp2682) | Data Sheets | English |
| Type | Volume velocity source |
| Power | 150 W, 50 W, 130 W |
| Lower frequency | 16 Hz, 100 Hz, 32 Hz |
| Higher frequency | 2 kHz, 16 kHz, 8 kHz |
| Sound pressure level | 115 dB, 108 dB, 116 dB |
List of accessories available for all variants of this family
| Product Code | Description |
|---|---|
-2755-A-X-
|
2755 Smart Power Amplifier (w/o Wi-Fi) |
|
-2755-X--
|
2755 Smart Power Amplifier |
Introduction to HBK 4250 Wideband Volume Velocity Sources
Set up a volume velocity probe and make measurements in BK Connect
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, 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.
