手机综合测试仪CMD55 CMD55 CMD55 CMD55 CMD55
    
    
  
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CMD55适用于手机组装厂做手机耦合测试，适用任何GSM手机，比8922M呼叫测试速度快、大大提高手机生产测试速度，提高工作效率和产量.
    
    
    
    CMD55可以测试GSM、DCS频段的射频指标，也有音频测试的功能，另外，可以用CMD55和手机发起一个呼叫测试，测试协议侧的一些指标。
    
    
    CMD55 耦合测试的主要参数：
    功等级为GSM900：5，10，15 分别对应的信道为：1，62，124，
    功等级为GSM1800：0，5，10 分别对应的信道为：512，698，885各三个等级。
    CMD55 藕合测试一般只测试功率等级5，，配一个天线耦合板直接连到仪器就可以了.
    
    

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 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 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

(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 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 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 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.CMD55 CMD55