Acoustic Impedance Tube/insulation Test Apparatus Didactic Equipment Vocational Training Equipment Electrical Training Equipment

Name: Acoustic Impedance Tube/insulation Test Apparatus Didactic Equipment Vocational Training Equipment Electrical Training Equipment
Brand: sdafit.com
SKU: B400
Availability: InStock
Rating: 5 (1 reviews)

Item No.: B400

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Description

B400 Acoustic Impedance Tube/insulation Test Apparatus Didactic Equipment Vocational Training Equipment Electrical Training Equipment

Description
The B400 consists of a transparent plastic tube fitted at one end with a glass reinforced plastic enclosure containing two loudspeakers and at the other with a heavy sample holder. A small microphone may be moved axially along the tube and its position measured. The loudspeakers are fed with a common pure tone from a function generator and the sound waves pass along the tube to the sample.
Dependent upon the type of material and the tone frequency, a portion of the sound energy is absorbed and the remainder is reflected back along the tube. The portion absorbed being converted into heat by the viscous action of the airborne wave as it passes through the absorber.
Interference between the incident sound waves and those reflected result in a standing wave field whose amplitude varies along the length of the tube. With the aid of the optional B400A instrumentation package the amplitude of the maximum and minimum signals received by the travelling microphone may be measured and from these values the
Sound Absorption Coefficient at the test frequency may be measured.

Features
Clearly demonstrates acoustic attenuation of a range of common building materials (carpet, cork and fibre board).
Oscilloscope enables students to visually see immediate changes to acoustic attenuation
Safe for use without ear protection as noise source is enclosed.
A Low cost alternative to the well-known Laboratory Standard
Acoustic Impedance tube.
Technical Specification
Tube Clear rigid plastic, internal diameter Ø69mm x 1200mm long.
2 x Loudspeaker housed in a G.R.P. enclosure.
Sample Holder: Dense ‘Tufnol’ plug on which samples are mounted. Fitted with quick release catches.
Amplifier Unit To amplify loudspeaker and microphone signals.
Weights & Dimensions
Weight: 9 kg
Length: 1500mm
Width: 500mm
Height: 200mm