东莞精丰电子有限公司 联系电话: Q T: 0769-86850182 F: 0769-86850156 邮编:523710 地址:东莞塘厦镇塘龙东路63号美华中心0126 CMD55产品特点: ·是测量GSM及GSM1800移动电话的紧缩式单元 ·通过RS232,IEC/IEEE远控 ·前面板有多功能连接器 ·话音编码器/解码器可被集成 ·可选择安培表和伏特表 ·高敏感度二级RF输入 ·可改进为GSM、GSM1800及GSM1900测试 CharacteristicsThe CMD52 is a compact unit for testing GSM900 mobiles. The CMD55 is furthermore capable of testing GSM1800 (formerly named PCN orDCS1800) and GSM1900 (formerly named PCS or DCS1900) mobile phones. Both models are favourably priced and combine small dimensions with high measurement accuracy and speed.The testers range of capabilities includes all **ling, generator and measurement functions required for verifying the correct operation of the DUT (Device Under Test). Thanks to its fast go/nogo tests and accurate analysis using optional extensions, CMD52 and CMD55 are equally well suited for R&D, production and high-end service and production.Based on the wide-range know-how of Rohde & Schwarz in digital radiocommunication testing, which not least was obtained in developing type-approval test systems such as the GSM900 and GSM1800 system simulators, both CMD models are top- grade testers for present and future measurement applications.Test capabilitiesTo test mobile phones, the CMD simulates a GSM900, 1800 or 1900 base station. One of the two RF synthesizers available for this purpose delivers a continuous BCCH ** while the other one provides all 8 timeslots for TCH **s.The major test functions are :Mobile synchronizationLocation updateIncoming call setupOutgoing call setupMobile power level controlHandover (channel change, timeslot change)Peak power measurementHigh dynamic range burst analyzer (option CMD-B4 and CMD-B42)Spectrum due to Switching measurement (option CMD-B4 and CMD–B43)Spectrum due to Modulation measurement (option CMD-B4 and CMD–B43Timing Advance measurementSACCH measurement (eg RxLev, RxQual, power level)Echo testCall clearing by mobile phoneCall clearing by CMDDC current/voltage measurementsPhase and frequency error measurement (option CMD-B4)Measurement of power ramping as a function of time (option CMD-B4)Bit-error rate (BER) and Fast BER measurement (option CMD-B4)OperationOperation of the CMDis extremely user-friendly and requires no detailed GSM/PCN knowledge. The high-contrast, backlit LCD provided with softkeys on both sides
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进口石蜡油报关需要注意哪些难点万享进贸通供应链(上海)有限公司进口顾问:刘杨 万享供应链为客户提供相关货品的进口审价、进口税率、进口监管条件,为进口商提供精确的进口成本。在任何时刻为货主提供匹配的“各类企业、各种化工品、危险品、不同口岸、不同进口方式”进口案例。万享多年来一直致力于进口各类化工品、食品一条龙服务,世界各大常见城市均有万享的代理,无论是上门提货,到国外港口报关,海运订舱,直
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