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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

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Testing loudspeakers in a production environment - the P630 test system

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  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

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