1 / 34

Testing loudspeakers in a production environment - the P630 test system

Testing loudspeakers in a production environment - the P630 test system. K & K International. Ib Rasmussen. Requirements for quality test 品質測試的必要條件. Fast 快速 Reliable detection of approve / reject 通過 / 失敗的可靠檢測 Working in a production environment 可以工作在生產環境下 Easy to use 易於使用

kaiyo
Download Presentation

Testing loudspeakers in a production environment - the P630 test system

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Testing loudspeakers in a production environment - the P630 test system K & K International Ib Rasmussen

  2. Requirements for quality test品質測試的必要條件 • Fast快速 • Reliable detection of approve / reject 通過/失敗的可靠檢測 • Working in a production environment 可以工作在生產環境下 • Easy to use易於使用 • Cost effective成本實效 K & K International

  3. Typical parameters for a quality test(品质测量的典型参数) • Frequency response(频率响应) • SPL(声压级) • Sensitivity(灵敏度) • Polarity (phase)(极性) • Impedance(阻抗) • Resonance(共振) • Q(品质因数) • THD(总谐波失真) • Rub & Buzz(摩擦,嗡嗡声) K & K International

  4. P630 access levelsP630入門級別 Operator Run-mode 操作員-運行模式 Testing測試 QC engineer Setup-mode 品質檢測工程師-設置模式 MeasurementParameters Limit’s 測量參數的設定 R&D engineer Global-mode Utility’s 設計開發工程師-全局模式 Signal analysis, Statistics User interface, Utility's Data management 信號分析、統計 用戶接口、實用功能 數據管理 K & K International

  5. P630 high performanceP630 的高性能 • Using system multiplexing 使用系統多路技術 • Parallel signal processing 並行信號處理 • Sine sweep for a reliable Rub & Buzz test 可靠的R&B測試-正弦掃描 • Impedance measurement done by current sensing 用電流感應來完成阻抗測量 • All measurements done by 1 sweep 一次掃描完成所有的測量項目 K & K International

  6. THD and Rub & BuzzTHD和R&B • Sensitivity of the ear (人耳的灵敏度) • Masking threshold • Level of THD & Rub & Buzz (THD与R&B的级别) K & K International

  7. Sensitivity of the ear耳朵的灵敏度

  8. Masking ThresholdExample @1 kHz

  9. Example THD 3 %Rub & buzz – 20 db below – bad speaker

  10. Speaker distortion扬声器失真 • non-linearly elements, magnetic – mechanic 非线性原理,磁场的,机械振动的 • missing / bad glue缺失的/劣质的粘合 • mechanical out of tolerance机械部分超出容限范围 • wire problems electrical – mechanical 电子的-机械的连接线问题 K & K International

  11. Different types of Rub & BuzzR&B的不同类型 • Harmonics generated(由谐波产生的) • Selective resonance(有选择性的共振) • Random generated(随机产生的) • Wide band noise - air noise(宽带噪声) K & K International

  12. Examples of non-linearity非线性样例Harmonic generated谐波产生的 • Voice coil Inductance声音线圈电感 • Motor – Force Factor 马达-耦合系数 • Mechanical Suspension机械的中断 K & K International

  13. Inductance & Force Factor Non-linearity感应系数和耦合系数的非线性 Induction(感应) Field strength(磁场强度)

  14. Example of mechanical Non-linearity of Suspension机械中断非线性样例

  15. Example - 3 & 6 volt

  16. Selective Distortion选择性的失真 • Passive selective resonance 被动的选择性共振 • - Missing gluing缺少粘合 • - Litze wire problems绞线问题 • - Lose voice coil wires音圈线遗失 • Power & Time critical功率和时间的臨界點 K & K International

  17. Example of Selective resonance选择性的共振(回声)

  18. Random Generated Distortion随机产生的失真 • -Lose particles in magnetic gab 遗失磁性微粒 • -Lose parts on membrane, spider or surrounding 缺少部件(薄膜,支架及周围) • -Missing soldering(缺少焊锡) • Power & Time critical功率和时间臨界點 K & K International

  19. Example of Random随机失真样例

  20. Wide band distortion宽带失真 • Air gab generated noise空气缝隙产生噪声 • Dust cab missing gluing灰尘缺少粘合 • Speaker cabinet problems扬声器内箱的问题 • Port air turbulences端口空气湍流 • Power & Time critical功率和时间的臨界點 K & K International

  21. Example of air-noise空气噪声样例

  22. Rub & Buzz Harmonic Generated Rub & Buzz K & K International

  23. Rub & Buzz Time Related Rub & Buzz K & K International

  24. Rub & Buzz Time Related – Harmonic Rub & Buzz K & K International

  25. Practical test parameters实际的测试参数 • Power功率 • Power must at a level to detect Rub & Buzz 功率必须在一定的规格下来检测R&B • Find best power level regarding power/time if allowed 在允许的条件下找出最佳的功率点 • Frequency range频率范围 • Low frequency take time低频点时间 • Select start frequency before resonance选择低频点(共振发生前) • The test time测试时间 • Start with a relative slow test time & then optimize test time regarding power/time开始用标准的测试时间, 然后根据功率/时间关系选择最优的测试时间 K & K International

  26. Electrical noise电子噪声 • Motors马达 • External power devices外部电源装置 • External transmitters外部发射机 • Move instrument wires away from power wires将仪器测试线远离电源线 • Reduce noise from source从源头减小噪声 • Place power device far away from test equipment 将供电设备远离测试设备 • Be sure no device which can generate noise are active while testing确保在测试时那些能产生噪声的设备没有运转 K & K International

  27. Acoustical noise声学噪声 • Background noise less than speaker distortion level背景噪声低于扬声器失真电平 • Environment noise環境噪聲 • tools - people - information systems - air condition工具-人-信息系統-空調機 • Isolate noise by make use of test boxes用測試盒來隔離噪聲 • Repeat test if test fail by noise?如果由於噪聲而導致測試失敗，可重複測試 K & K International

  28. The test box測試盒 • Placement of the measurement microphone 測試Microphone的擺放 • Frequency range, systems – units 頻率範圍，系統-單位 • Rub & Buzz - use more than one microphone(使用多個Microphone) • Microphone placement for Rub & Buzz(測試R&B時Microphone的擺放） • Test of the box測試盒的測試 • Use the instrument as a analyzer（將儀器作為分析儀） • Make the measurement in real production environment（在真實的生產環境下做測量） K & K International

  29. Summary概要 • Be careful to select power and test time to optimize Rub & Buzz detection（選擇功率和時間的關係來優化R &B的檢測） • Select microphone(s) on a optimized position（選擇Microphone的最佳擺放位置） • Be carefully to select a test box regarding environment（根據環境來選擇測試盒） K & K International

  30. P630 Main MenuP630主菜单

  31. Example of P630 Run-Flag ModeP630运行模式的例子dual test in chain mode

  32. Example of P630 Run-Graph ModeP630图表模式First test in chain mode

  33. Example of Main Setup Menu

  34. END

More Related