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　　深圳精诚电子仪器有限公司简称；(精诚 999)。是一家主打二手进口仪器回收、销售、租凭、计量、升级的公司，长期高价收购各类二手进口仪器仪表，如有闲置，待处理的仪器，欢迎随时来电咨询!本公司的产品可以出租，欢迎来电洽谈业务。

　　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 signalling, 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 optionalextensions, 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 deliversa continuous BCCH signal while the other one 

　　provides all 8 timeslots for TCH signals.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