CMD55产品特点：
·是测量GSM及GSM1800移动的紧缩式单元
·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
Characteristics
The 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 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 capabilities
To 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 signal while the other one provides all 8 timeslots for TCH signals.
The major test functions are:
Mobile synchronization
Location update
Incoming call setup
Outgoing call setup
Mobile power level control
Handover (channel change, timeslot change)
Peak power measurement
High 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–B43
Timing Advance measurement
SACCH measurement (eg RxLev, RxQual, power level)
Echo test
Call clearing by mobile phone
Call clearing by CMD
DC current/voltage measurements