NTN products are critical to keep the world moving smoothly. Our bearings and related products are present in a wide variety of industries. Please see the industries below that have applications for this product category.

Related Products• QC Standard Software:  Full EOL-testing software for ultra-fast and complex measurements, incl. tasks (SPL, IMP, SAN, PP, IO),   QC Start and dB-Lab 210

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AN 76 QC Testing of Wireless Audio DevicesAN 79a Quality Control of Sound Reinforcement EquipmentAN 79b Efficient, Mobile Quality Assurance of PA Speaker

Sharing the same processing kernel, the Air Leak Stethoscope (ALS) is a powerful off-line diagnostics tool to auralize and locate defects interactively.

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BEARING FINDER Are you looking for a specific size of bearing? Do you have an NTN or other part number to look up? Do you need a CAD file or technical specifications? Find and download the bearing information you need with NTN’s robust online product catalog tool.

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NTN offers 3 types of single point lubricators: Ready, Smart and Drive. Each responds to different applications: humid environments, variations in temperature, situations requiring a specific amount of grease, either remotely or physically at the point to be lubricated.

Other Modules of the QC System• Spectrogram 3d Limits (3DL):  Powerful and intuitive defect (Rub & Buzz) analysis based on auditory time/frequency (spectrogram) analysis• Meta-Hearing-Technology (MHT):  Defect detection beyond human hearing • Spectrum Analysis (SAN):  FFT spectrum, frequency response, A-weighted SPL and distortion with/without noise generator or user-defined   stimulus for noise & vibration or audio system testing

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Gluing errors in drivers are likely to cause air leakage in the surround or the dust cap that may only be audible in the final application when the driver is mounted in a closed or vented enclosure. Such leaks may not be detected under free air conditions due to the lack of air pressure caused by the acoustical short-circuit at low frequencies. Measuring the driver in an adequately small test box provides the required in-box pressure at low frequencies to stimulate even very small driver leaks. Additionally, the test box offers ambient noise attenuation for maximal sensitivity in leak detection and driver testing.

In addition to supplying high-quality bearings, NTN can provide its expertise and products to help manage lubrication issues. Our full range of single point lubricators ensures continuous, reliable, clean and extremely precise lubrication. Single point lubricators can be easily integrated into different types of applications (mechanical and automotive industries, steel mills, paper mills, etc.) thus providing optimized lubrication function without the need to modify your application.

All bearings, mechanical parts and industrial processes need lubrication to optimize life and production. In fact, over 55% of premature bearing failures are lubrication related. NTN recognizes the importance that proper lubrication plays in the life and performance of all components in any manufacturing process and that is why we offer a comprehensive line of single point lubricators. Our single point lubricator tools help maintenance professionals safely and automatically schedule lubrication of bearings or chains. Save time, increase productivity, prevent avoidable injuries, and ensure regular maintenance is done on time, every time with NTN single point lubricators.

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The incoming goods inspection in a rental company for professional audio products (PA speakers, stage monitors…) is crucial to identify damage due to ageing or misuse. The ALS is a powerful tool to identify and localize such defects easily. Using noise insulated headphones the operator can test the equipment at critical playback levels with maximal sensitivity while protecting the ears.

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In order to detect loose joints, enclosure defects or irregular port noise, leakage testing can be simply integrated directly into the sweep test by activating the ALD option in the SPL Task without adding any extra test time. To make sure that rear defects and leakage problems are detected reliably too, another test microphone may be placed at the back of the speaker for an additional ALD test step. Up to four microphones can be used for a single shot test. During the complete test sequence, the ambient microphone outside the test chamber detects ambient noise disturbance reliably and triggers the auto-repeat mechanism for single test steps, if necessary.

NTN’s automatic single point lubricators come with a number of features that provide excellent benefits to your operation:

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Sequential Test (Mic Multiplexer)Using microphone arrays, the number of simultaneous input channels is usually limited by the analyzer such as the KLIPPEL Production Analyzer. In this example, four test microphones are switched by a multiplexer for sequential testing. An additional microphone outside of the test chamber monitors ambient noise in parallel. The test chamber ensures a low acoustical noise floor for maximal measurement sensitivity while the microphone detects impulsive disturbance reliably.

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The picture shows a typical end-of-line test setup for active speaker systems such as a multimedia, Hi-Fi or portable speakers using KLIPPEL Analyzer 3 equipped with Laser Card and XLR Card. The main test microphone is located in the front for testing typical parameters such as frequency response, THD, Rub&Buzz distortion etc. using the SPL – Sound Pressure Task.

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The Air Leak Detection (ALD) module applies special audio signal processing to isolate pulsating flow noise generated by air leakage in loudspeaker drivers and enclosures as well as ports and in orifices. Limits can be applied to the resulting absolute and relative distortion levels in order to qualify and quantify air leakage and many other defects (rubbing, buzzing, loose particles). This technology can be applied as an automatic end-of-line test which seamlessly integrates in the test sequence with single tone excitation or as part of the standard chirp measurement (Sound Pressure Task (SPL)).

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Klippel GmbHMendelssohnallee 30 01309 Dresden/Germany Phone: 49.351.5019390Fax: 49.351.50193910 info(at)klippel(dot)dewww.klippel.net.cn

Simultaneous Test (KA3)Using the KA3 hardware, a high number of input channels can be measured simultaneously using the signal data sharing feature. The QC software currently supports measuring with four microphones at the same time. In case ambient noise is measured (recommended), three other microphone channels are available that may be connected to the Laser Card (IEPE microphones) or the XLR Card (48 V microphones or IEPE using XLR-BNC adaptor). The stimulus signal is played back only once by the source ALD task, which is recording all input signals. The receiver tasks only processes the microphone signals recorded by the source tasks in order to generate the test results and verdicts for all microphones.

Detecting air leaks in large speaker systems with only one microphone suffers from acoustical shadowing of the high frequency leak noise. Locating multiple microphones around the device under test overcomes this problem and the complete surface can be covered for optimum sensitivity.

AUTHORIZED DISTRIBUTOR SEARCH NTN has dozens of manufacturing plants and distribution centers throughout the Americas, to keep our distribution channels fully stocked. Use our distributor locator tool to find a distributor close to you.

General Features of the QC System• Comprehensive Testing• Fast as a Flash• Sensitive Rub&Buzz Detection• Production Noise Detection

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