MI-6420,MI6420,3D SI probe

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3-D Sound Intensity Measuring Probe

3-D Sound Intensity Measuring Probe

MI-6420

Photo (MI-6420 3-D Sound Intensity Measuring Probe)

The MI-6420 three-dimensional sound intensity measuring probe, has four microphones configured as the four apexes of a regular tetrahedron.
With this configuration, the MI-6420 is capable of simultaneous acquisition of data for the three components of X, Y and Z axes of a three-dimensional intensity vector.
When combined with the three-dimensional sound intensity analyzing system featured on the DS-2000 series Data Station, and MI-0620 sound pressure phase calibrator, this instruments also permits display and analysis of a three-dimensional acoustic intensity vector.
The MI-6420 has adaptors as standard equipment for setting microphones at an equal scaling spacing of 60 mm or 20 mm.
These setting adaptors enable the MI-6420 to cover frequencies from 40 Hz to 1.2 kHz (with the 60 mm adaptor), or from 120 Hz to 3.6 kHz (with the 20 mm adapter), with 1 dB error. If 2 dB error is permissible, it is possible to cover frequencies from
40 Hz to 1.7 kHz (with the 60 mm adapter), or 120 Hz to 5.0 kHz (with the 20 mm adapter). microphone, using an adaptor.

Features

Simultaneous acquisition of X, Y, and Z component data of three-dimensional acoustic intensity vector
Simple and easy-to-handle probe configuration with minimized disturbance to sound field
Compared to the uniaxial sound field intensity probe, data acquisition time can be reduced to 1/3

Specifications

Probe structure		Tetrahedron 4-microphone three-dimensional arrangement
Microphone type		1/4-inch diameter, back electret condenser microphone
Sound pressure sensitivity level (0 dB = 1 V/PA)		-24 dB±3dB
Measuring sound pressure level	min.	38 dB (A), 46 dB (F)
Measuring sound pressure level	max.	110 dB (1 kHz, THD = 3 %)
Temperature coefficient		0.5 dB/10°C (TYP)
Gap between microphones	for low frequency	60 mm
Gap between microphones	for high frequency	20 mm
Measuring frequency range	for low frequency	40 kHz to 1.2 kHz (-1 ± 1 dB)
Measuring frequency range	for high frequency	120 kHz to 3.6 kHz (-1 ± 1 dB) 120 kHz to 5.0 kHz (-2 ± 1 dB)
Shortest distance between measuring object and acoustic center	for low frequency	approx. 40 mm
	for high frequency	approx. 14 mm
Phase difference between microphones		within 0.4 deg. (1 kHz, max., after calibration) within 0.8 deg. (4 kHz, max., after calibration)
Operating temperature		-10 to +40°C
Outer dimensions	overall length	525.0 to 560.0 mm
	max. width	30.0 to 70.0 mm
	max. height	28.0 to 55.0 mm
Weight		Approx. 300 g (probe) Approx. 360 g (including 5 m cable)

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