手機綜合測試儀CMD55 CMD55 CMD55 CMD55 CMD55
    
    
  
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CMD55適用於手機組裝廠做手機耦合測試，適用任何GSM手機，比8922M呼叫測試速度快、大大提高手機生產測試速度，提高工作效率和產量.
    
    
    
    CMD55可以測試GSM、DCS頻段的射頻指標，也有音頻測試的功能，另外，可以用CMD55和手機發起一個呼叫測試，測試協議側的一些指標。
    
    
    CMD55 耦合測試的主要參數：
    功等級為GSM900：5，10，15 分別對應的信道為：1，62，124，
    功等級為GSM1800：0，5，10 分別對應的信道為：512，698，885各三個等級。
    CMD55 藕合測試一般只測試功率等級5，，配一個天線耦合板直接連到儀器就可以了.
    
    

CMD55產品特點：

?是測量GSM及GSM1800移動電話的緊縮式單元

?通過RS232，IEC/IEEE遠控

?前面板有多功能連接器

?話音編碼器/解碼器可被集成

?可選擇安培表和伏特表

?高敏感度二級RF輸入

?可改進為GSM、GSM1800及GSM1900測試

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