Type 4250

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

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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

Wideband omnidirectional acoustic radiation for assessment of both airborne and structure-borne generated phenomena
Accurate in situ measurement of output volume velocity using a pair of low-noise, ¼-inch microphones
Dual-microphone design minimizes near-field effects of the test object for optimum measurement accuracy
High-power output for measurement on vehicles with high transmission loss or when background noise conditions are sub-optimal
Measurement of frequency response functions at vehicle source systems (engine bay, tyres etc.) with the use of a low-emission, 3-metre hose
Quick-release coupling system for switching probes or hose-probe assemblies on the driver
Microphones with CCLD and TEDS for quick setup
Built-in overload protection circuit
Can be used with BK Connect software for real-time volume velocity measurements:
- Use VVS Measurements Type 8442 for frequency response measurements related to a pass-by source path contribution model
- Use Data Processing Type 8403 for general NVH measurements

Code	Actions	Price	Availability	Name
-4250-C-003-				HF VVS Hose and Nozzle
-4250-C-004-				HF VVS Driver
-4250-E--				Wideband Volume Velocity Sources
-4250-D--				Low-Mid Frequency Volume Velocity Source
-4250-B--				Mid Frequency Volume Velocity Source
-4250-B-003-				MF VVS Hose and Nozzle
-4250-A-003-				LF VVS Hose and Nozzle
-4250-A--				Low Frequency Volume Velocity Source
-4250-C--				High Frequency Volume Velocity Source
-4250-A-004-				LMF VVS Driver

File	Description	Type	Languages	Size
Product Data: HBK 4250 Wideband Volume Velocity Sources (bp2682)		Technical Document	English	1 MB

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Type 4250

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