羅德&施瓦茨 CMD55綜合測試儀
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：彭/劉穎
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在線： 53593211
在線： 200833426
: xinhuifu
深圳鑫惠福電子儀器有限公司
24小時(shí)：４００－８８２－１７１８
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我公司專業(yè)銷售CMD55,租賃CMD55,維修CMD55，保養(yǎng)CMD55，高價(jià)回收CMD55
CMD55產(chǎn)品特點(diǎn)：
·是測量GSM及GSM1800的緊縮式單元
·通過RS232，IEC/IEEE遠(yuǎn)控
·前面板有多功能連接器
·話音可被集成
·可選擇安培表和伏特表
·高敏感度二級(jí)RF輸入
·可改進(jìn)為GSM、GSM1800及GSM1900測試
技術(shù)指標(biāo)： GSM900/1800/1900MHz
The CMD55 is furthermore capable of testing GSM1800 (formerly named PCN orDCS1800) and GSM1900 (formerly named PCS or DCS1900) 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 phones, the CMD simulates a GSM900, 1800 or 1900 base station. One of the **o 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:
synchronization
Location update
Incoming call setup
Outgoing call setup
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 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 ne**ork-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 . Words spoken into the microphone of the 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 ephones 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.
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產(chǎn)品名稱：手機(jī)測試儀、網(wǎng)絡(luò)分析儀、頻譜分析儀、綜合測試儀、數(shù)字通訊測試儀、高頻信號(hào)源、高頻示波器、 電聲測試儀、音頻分析儀、邏輯分析儀、微波頻率計(jì)、調(diào)制度儀、功率計(jì)等高頻測試儀器。
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