供应二手综合测试仪CMD55

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
·**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 
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.AutotestThe 
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 controlThe 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 testThe 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 ** path from the microphone via the RF transmitter
 section, RF receiver section, modulator, demodulator, **ling 
section, speech coder/decoder, analog audio components through to 
the loudspeaker.Testing handheldsIn 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 testingFault localization 
in mobile telephones requires various measurement functions that can
 also be used without **ling so that defective units can be tested 
down to modular level. The basic model of CMD already provides some 
of these functions, eg ** generation with or without modulation 
or power measurements, other functions being available as optional 
extensions. 

长期出售，出租，回收进口高 低档二手仪器：（全一手货源，库存多，价格好）
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