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关 键 词：CMD55
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发布时间：2009-05-11
低价供应CMD55 CMD55 CMD55 欢迎来电咨询!期待顾客上门看货!您的满意是我们最终的追求! 详细说明: 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 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 Phase 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) Operation Operation of the CMDis extremely user-friendly and requires no detailed GSM/PCN knowledge. The high-contrast, backlit LCD provided with softkeys on both sides allows convenient callup of test routines under menu control. Various network-specific parameters are preset and permit direct testing without any operator control. In addition, it is of course possible to modify all parameters individually in the configuration menus. Autotest The autotest function enables complete measurement routines to be started at a keystroke without any further intervention by the operator being required. The test results in tabular form are displayed on the screen. Remote control The CMD is remote-controlled via the RS-232 or IEEE/IEC-bus interface using SCPI-compatible commands. In the remote-control mode the CMD is designed for fast speed to yield high throughputs in production. Echo test The echo test allows very rapid go/nogo analysis covering all essential parts of the mobile. Words spoken into the microphone of the mobile are sent to the CMD, stored in buffer memory and sent back to the phone. In this way it is possible to check the whole signal path from the microphone via the RF transmitter section, RF receiver section, modulator, demodulator, signalling section, speech coder/decoder, analog audio components through to the loudspeaker. Testing handhelds In addition to the normal RF input/output, the CMD has a high-sensitivity input and a high-level output which enable tests on modules or on handhelds with built-in antenna by using couplers like the CMD-Z10. Module testing Fault localization in mobile telephones requires various measurement functions that can also be used without signalling so that defective units can be tested down to modular level. The basic model of CMD already provides some of these functions, eg signal generation with or without modulation or power measurements, other functions being available as optional extensions. 经营品牌 美国安捷伦/惠谱（Agilent/HP）、美国泰克（Tektronix）、美国福禄克(fluke)、日本健伍（Kenwood）、日本菊水(Kikusui)、台湾固纬（GWinstek）、、日本横河(Yokogawa)、美国吉时利(Keithley)、摩托罗拉（Motorola）、美国力科（LeCroy）、美国韦夫特克（Wavetek）、德国罗德施瓦茨（ROHDE&SCHWARZ(R/S)）、德国WG（Wandel&Goltermann）、英国马可尼（Maconi）、日本安立(安利)（Anritsu）、日本爱德万（ADVANTEST）、日本利达（LEADER）、日本松下（Panasonic） 回收 供应 租赁: 示波器 网络分析仪 综合测试仪 频谱分析仪 信号发生器 噪声系数分析仪 音频分析仪 数字万用表 表程控电源 功率计 频率计 阻抗分析仪 视频分析仪 函数信号发生器 LCR电子测试仪 电子负载万 用表校准仪 示波器校准仪 高压机 数据采集器 接收/发射机 测量接收机 电缆/天线分析仪 调制度分析仪 蓝牙综测仪 GPIB卡等
