Bruel & Kjaer 4227-A Vibration and Sound

Description

Features:
Accurate and very consistent simulation of human voice field
Built-in class D amplifier
Continuous SPL of 110 dB at 25 mm from lip ring
Low distortion
Built-in overload protection circuit
Optional regulating microphone for very accurate frequency response control
Calibration jig included
Conforms to standards: IEEE-269, IEEE 661 and ITU-T Rec. P.51
Low sensitivity to temperature and humidity changes
Uses
Quality control testing of frequency response and distortion of telephone transmitters and close-talk microphones
Sound source for acoustic measurements
The Mouth Simulator Type 4227-A is a high performance artificial mouth conforming to ITU-T Rec. P.51 and designed for accurate and repeatable electroacoustic measurements. The mouth simulators produce a guaranteed minimum continuous output of 110 dB SPL at a distance of 25 mm from the lip ring. A sound pressure level of more than 120 dB is possible with pulsed operation. A built-in overload-protection circuit minimizes the risk of accidental damage to the loudspeaker. A microphone can be fitted at the mouth opening for use in a compressor loop to give constant sound pressure output.
The mouth simulators are high-performance, low-distortion sound sources used for testing acoustic transducers. They consist of a high-quality loudspeaker mounted in a specially shaped housing. A lip ring is mounted on the upper surface of the unit, providing a convenient reference plane for measurements. Type 4227-A has a built-in class D amplifier which simplifies setup and minimizes thermal output, allowing use of the mouth simulator in small test chamber installations while avoiding heating of tested components.
When testing telephone transmitters and close-talk microphones, it is required that the sound field closely replicates the sound field generated by the human mouth, as specified in IEEE 269 and ITU-T Rec P.51 as fulfilled by Type 4227-A.
GUARANTEED QUALITY
Payment Terms
We accept payment prior to shipping
Domestic
:
Payment methods accepted:
PayPal - Preferred
Illinois buyers pay appropriate sales tax based on county (Please contact ValueTronics before making payment).
International
:
Payment methods accepted:
PayPal
All international buyers must request an invoice via email from ValueTronics to include shipping costs before finalizing purchase.
Return Policy
ValueTronics honors the buyer’s right of refusal for 14 days from receipt.
Buyer pays return shipping/packaging of all returns (Domestic and International).
Refund is credited to buyer’s account upon verification of unit’s condition.
Returns must be shipped with all original accessories. We will not accept any items with obvious signs of additional wear and tear or internal component alterations. All of our items will ship with “Warranty Void” tamper resistant stickers. If any stickers have been removed or tampered with your refund will be cancelled.
If you need to return your purchase please contact ValueTronics for a RMA.
Shipping & Handling
Domestic:
Varies by listing
(Includes Insurance)
All buyers in the continental United States pay a flat rate or determined rate for larger items. Contact us for freight charges where not listed. Insurance is mandatory and included on all shipments.Other shipping methods are available at the request and expense of the buyer.
International:
Buyer pays all shipping costs.
Buyer must request invoice that includes shipping costs before finalizing sale on eBay.
Shipping insurance is mandatory on all overseas orders.Your phone number is required for shipping purposes so please provide your phone number with all correspondence.
Estimated Delivery
: We can usually ship orders within 5 business days of payment receipt. If we can not meet this expectation you will be promptly notified. Many items can be shipped same day. Contact us for more information.
Shipping
: All items are professionally packed to arrive undamaged. If a purchase is received in damaged condition, you must immediately file a claim with the freight carrier and report the same to us. All packaging materials must be saved for inspection by the carrier representatives.
Feedback
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