周一到周五 9:00~18:00&&&400-830-6691|||买家卖家电容电阻晶振电感电位器磁性材料保护器件外设模块电源焊接工具五金工具耗材连接器/接插件组件开关天线应用工具继电器热缩管电子测量仪器电工测量仪器环境测量仪器光学检测仪器力学检测仪器气体检测仪器自动化设备量具微处理器FPGA/CPLD 编程逻辑器件DSP 数字处理器SOC集成电路其他控制芯片通用芯片开关二极管三极管MOSFET稳压二极管肖特基二极管通用二极管整流二极管可控硅瞬态抑制二极管TVS二极管数模转换运放数字隔离射频收发逻辑时钟FRAMSDRAM/DRAMEEPROMFLASH压力传感器温度传感器湿度传感器位置传感器磁敏传感器气体传感器液位传感器光电传感器光耦灯具LED配件灯珠其它您在：&>&&>&&>&图片仅供参考，商品以实物为准(0人气)CRCWED制造商：VISHAY DALE供应商：库&存：1488个（1个起订）货&期：5-10（工作日）服务承诺：正品保证真实库存担保交易按时发货参考价格数量单价含17%税1+?250.532100+?2.693<td data-num="+?0.383<td data-num="+?0.085相关产品&咨询电话400-830-6691采购咨询&服务时间&09:00-18:30天鹅CS54-S1彩电图像发毛，蒙有一层“白雾”
天鹅CS54-S1彩电图像发毛，蒙有一层“白雾”
&& 分析图像的对比度变差，应重点检测末级视放电路。检测中发现各视放管的集电极电压和显像管各阴极电压均由正常的120V降低为110V。由于是3个视放管的Vc都同时降低，所以，认为视放电源出了故障。检查视放电源电压为170V（正常应为180V），略低，进一步检查发现视放电源滤波电容C860（4.7uF/250V）的1个引脚脱落，电解液泄漏，己无电容量。经更换
&& 分析图像的对比度变差，应重点检测末级视放电路。检测中发现各视放管的集电极电压和显像管各阴极电压均由正常的120V降低为110V。由于是3个视放管的Vc都同时降低，所以，认为视放电源出了故障。检查视放电源电压为170V（正常应为180V），略低，进一步检查发现视放电源滤波电容C860（4.7uF/250V）的1个引脚脱落，电解液泄漏，己无电容量。经更换新电容后，故障排除。&&&
&& 小结：从图中可以看出，虽然视放电源的滤波电容C860失效无电容量，但消除干扰作用的电容C628（0.1uF/400V）还可以起到一定程度的滤波作用。C628采用了聚脂电容，无电解电容易变质的毛病。由于C628电容量小，滤波作用相应比较弱，使视放电压降低了10V左右，显像管的各阴极工作电压也就相应降低了10V，从而引起了显像管的束流有些增大，图像的亮度当然也就增大，最终造成图像的对比度减弱，图像看起来比正常收看时像蒙有一层“白雾”。&&
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C628C472KHR5TA系列
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按字母分类 ：C627/C628 (KEMET) PDF技术资料下载
C627/C628 供应信息 IC Datasheet 数据表 (1/14 页)
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多层陶瓷电容器/推力和径向引线
[MULTILAYER CERAMIC CAPACITORS/AXIAL & RADIAL LEADED]
&&C627/C628PDF文件：
多层陶瓷电容器/推力和径向引线[MULTILAYER CERAMIC CAPACITORS/AXIAL & RADIAL LEADED]
文件大小：&&929 KPDF页数：
&&14 页联系供应商：&& 品牌Logo:
&&&&KEMET [ KEMET CORPORATION ]
MULTILAYER CERAMIC CAPACITORS/AXIAL& RADIAL LEADEDMultilayer ceramic capacitors are available in avariety of physical sizes and configurations, includingleaded devices and surface mounted chips. Leadedstyles include molded and conformally coated partswith axial and radial leads. However, the basiccapacitor element is similar for all styles. It is called achip and consists of formulated dielectric materialswhich have been cast into thin layers, interspersedwith metal electrodes alternately exposed on oppositeedges of the laminated structure. The entire structure isfired at high temperature to produce a monolithicblock which provides high capacitance values in asmall physical volume. After firing, conductiveterminations are applied to opposite ends of the chip tomake contact with the exposed electrodes.Termination materials and methods vary depending onthe intended use.TEMPERATURE CHARACTERISTICSCeramic dielectric materials can be formulated withClass III:General purpose capacitors, suitablea wide range of characteristics. The EIA standard forfor by-pass coupling or other applications in whichceramic dielectric capacitors (RS-198) divides ceramicdielectric losses, high insulation resistance anddielectrics into the following classes:stability of capacitance characteristics are of little orno importance. Class III capacitors are similar to ClassClass I:Temperature compensating capacitors,II capacitors except for temperature characteristics,suitable for resonant circuit application or other appli-which are greater than ± 15%. Class III capacitorscations where high Q and stability of capacitance char-have the highest volumetric efficiency and poorestacteristics are required. Class I capacitors havestability of any type.predictable temperature coefficients and are notaffected by voltage, frequency or time. They are madeKEMET leaded ceramic capacitors are offered infrom materials which are not ferro-electric, yieldingthe three most popular temperature characteristics:superior stability but low volumetric efficiency. Class IC0G:Class I, with a temperature coefficient of 0 ±capacitors are the most stable type available, but have30 ppm per degree C over an operatingthe lowest volumetric efficiency.temperature range of - 55°C to + 125°C (Alsoknown as “NP0”).Class II:Stable capacitors, suitable for bypassX7R:Class II, with a maximum capacitanceor coupling applications or frequency discriminatingchange of ± 15% over an operating temperaturecircuits where Q and stability of capacitance char-range of - 55°C to + 125°C.acteristics are not of major importance. Class IIZ5U:Class III, with a maximum capacitancecapacitors have temperature characteristics of ± 15%change of + 22% - 56% over an operating tem-or less. They are made from materials which areperature range of + 10°C to + 85°C.ferro-electric, yielding higher volumetric efficiency butless stability. Class II capacitors are affected bySpecified electrical limits for these three temperaturetemperature, voltage, frequency and time.characteristics are shown in Table 1.SPECIFIED ELECTRICAL LIMITSParameterDissipation Factor: Measured at following conditions.C0G – 1 kHz and 1 vrms if capacitance &1000pF1 MHz and 1 vrms if capacitance 1000 pFX7R – 1 kHz and 1 vrms* or if extended cap range 0.5 vrmsZ5U – 1 kHz and 0.5 vrmsDielectric Stength: 2.5 times rated DC voltage.Insulation Resistance (IR): At rated DC voltage,whichever of the two is smallerTemperature Characteristics: Range, °CCapacitance Change withoutDC voltage* MHz and 1 vrms if capacitance100 pF on military product.Temperature CharacteristicsC0GX7R2.5%(3.5% @ 25V)Z5U0.10%4.0%Pass Subsequent IR Test1,000 MFor 100 G-55 to +1250 ± 30 ppm/°C1,000 MFor 100 G-55 to +125± 15%1,000 Mor 10 GF+ 10 to +85+22%,-56%Table I4(C) KEMET Electronics Corporation, P.O. Box 5928, Greenville, S.C. 29606, (864) 963-6300