Circuit principles, analogue circuit, digit circuit which laid me a solid foundation of circuit for the study of communication; the study of electronic circuit of communication provided me with the working principles of analog communication system; the study on communication theory made me grasp the working methods of digital communication; the study on electromagnetic field, electromagnetic wave and aerial let me know that how signals travel through signal paths and how to apply signal and linear system, random signal and system to the research of noise's impact on signals

學(xué)習(xí)了電路原理一级做a爱片久人毛片A片、模擬電路黄色工厂在线视频、數(shù)字電路打下了學(xué)習(xí)通信的電路基礎(chǔ)；學(xué)習(xí)了通信電子線路掌握了模擬通信系統(tǒng)的工作原理无码18；學(xué)習(xí)了通信原理掌握了數(shù)字通信的工作方法99精品在线免费观看；學(xué)習(xí)了電磁場與電磁波、微波與天線了解了信號(hào)如何在信道中傳輸视频色色；學(xué)習(xí)了信號(hào)與線性系統(tǒng)和隨機(jī)信號(hào)與系統(tǒng)來研究噪聲對(duì)信號(hào)的影響亚洲天天在线看视频。

When digit signal orbital circuit is adopted in the equipment, which is used to transmit train-to-wayside information and location train position, the length of digital signal orbital circuit should be the minimal measure unit of distance interval between trains.

采用數(shù)字軌道電路作為車－地信息傳輸設(shè)備及列車定位設(shè)備時(shí)，列車之間的安全間隔距離必須以數(shù)字軌道電路的長度作為最小計(jì)量單位欧洲一级黄色视频。

According to the demand of high magnetic field power supply, reference is increased with a set ramp rate and stops at a set stable value, so reference system is composed of digital setting and digit to analog converting circuit. But the stability of reference is mostly guaranteed by the performance of D/A circuit, so D/A circuit is particularly studied in reference system. The scheme of D/A circuit, the selection of DAC and its voltage reference, hardware anti-jamming design and PCB design are discussed in detail, and software of remote control and PLC are discussed in brief. Zero-flux DC current transformer well satisfies the demands of the high stability of Load current detection unit, so the principle of zero-flux DC current transformer is analyzed; in the mean time a project which detects the long term stability is designed. During 8 hours, analog signal which is detected with high precision digit multimeter is recorded in computer at 1HZ frequency by GPIB communication. The drift error source and related parameters are explained in the compare-amplify part. Detailed subtraction circuit is designed; also amplifier chip and periphery components are selected and verified according to the theory of error analysis.

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The topic in view of the existing technique level, the main factors, which influence the measurement precision of the large scale test system, are analyzed in this paper, and the solutions improving the precision are put forward.1 using the multi-channel independent AC to transfer DC module, the power supply of the digit part and the simulation part is discerption, reducing the crosstalk between the digital signal and the simulated signal;2The feedback self-checking module is constructed by singlechip compositive 16 high accuracy A/D , established a closed-loop control system through this module and improved system's overall precision effectively.

本課題針對(duì)現(xiàn)有的技術(shù)水平久草精品视频播放，分析了影響大型檢測系統(tǒng)測量精度的主要因素，提出了提高精度的具體方案和辦法：1采用了多路獨(dú)立交流轉(zhuǎn)直流模塊欧美AAA，數(shù)字部分與模擬部分分開供電在线免费观看黄色av，減小了數(shù)字信號(hào)與模擬信號(hào)之間的串?dāng)_。2利用單片機(jī)集成的16位高精度A/D構(gòu)建了反饋?zhàn)詸z模塊，通過該模塊建立了一個(gè)閉環(huán)控制系統(tǒng)操屄免费视频，有效地改善了系統(tǒng)的整體精度九九99re6这里都是精品。

The matching device automatic test-board is the checking tool checked the matching device capability, precision and reliability are the technique of the the matching device, the precision is the precondition of checking the matching device, the reliability is credibility degree of the decision checking consequent.the topic in view of the existing technique level, the main factors, which influence the measurement precision of the large scale test system, are analyzed in this paper, and the solutions improving the precision are put forward.1 using the multi-channel independent ac to transfer dc module, the power supply of the digit part and the simulation part is discerption, reducing the crosstalk between the digital signal and the simulated signal;2the feedback self-checking module is constructed by singlechip compositive 16 high accuracy a/d , established a closed-loop control system through this module and improved system's overall precision effectively.

匹配裝置自動(dòng)測試臺(tái)是檢測匹配裝置性能的檢測工具，其重要的技術(shù)指標(biāo)是精度與可靠性操逼逼亚洲国产，其高精度是作為檢測匹配裝置的前提淫乱精品自拍，可靠性是決定了檢測結(jié)果的可靠度。本課題針對(duì)現(xiàn)有的技術(shù)水平色哟哟哟在线，分析了影響大型檢測系統(tǒng)測量精度的主要因素黄色网页免费观看，提出了提高精度的具體方案和辦法：1采用了多路獨(dú)立交流轉(zhuǎn)直流模塊，數(shù)字部分與模擬部分分開供電免费观看A级毛片久久，減小了數(shù)字信號(hào)與模擬信號(hào)之間的串?dāng)_免费一级IA片在观看播放视频。2利用單片機(jī)集成的16位高精度a/d構(gòu)建了反饋?zhàn)詸z模塊，通過該模塊建立了一個(gè)閉環(huán)控制系統(tǒng)玩成熟老熟女视频二区，有效地改善了系統(tǒng)的整體精度日本A级黄色网站。

It is found that one digit can be encoded and decoded on one pulse at any location since the width of the signal is much narrower than that of the pulse of the transmitter.

研究發(fā)現(xiàn)，由于信號(hào)的寬度相對(duì)于脈沖的寬度很窄黄色网站免费永久，我們可以在脈沖的任意位置對(duì)信號(hào)進(jìn)行編碼和解碼国产精品一区久久久久久。

Measure character: Frequency limits: CH1:dResolution of C ～ 225MHz frequency: 10 / second time-interval resolution : N/A measures speed: Can amount to 200 times measure / the second mixes in limits of the voltage on GPIB sensitivity : DC ～ 100MHz: 200MHz of ～ of 5Vac+dc 100MHz of 20mVrms ～±: 225MHz of ～ of 5Vac+dc 200MHz of 30mVrms ～±: Input of 5Vac+dc of 40mVrms ～± adjusts:(CH1 chooses) impedance, coupling: 1M Ω or 50 Ω, ac or Dc are low connect filter: 100kHz, but switch attenuation:× 1 or reference of × 10 exterior time base inputs: 1, 5, 10MHz sparks: CH1, to rising / drop the edge sparks, the percentage that uses signal n or absolutely voltage install n, setting sensitivity mixes to low, medium or tall gate start: Automatic, the hand is moved (setting gate time or resolution digit); Exterior, defer interface: Standard GP-IB(IEEE 488.1 and 488.2), take; of SCPI compatible language to say RS-232 power source only: 10 ％ of 100-120VAC ±, 50, 60 or 10 ％ of 400Hz ± 10 ％ of 220-240VAC ±, 50 or 10 ％ of 60Hz ± are suttle: 3kg dimension: 348.3mm of × of 212.6 × 88.5H

測量特征：頻率規(guī)模：CH1：dc～225MHz 頻率分辨率：10位/秒時(shí)候距離分辨率：N/A 測量速度：可達(dá)200次測量/秒在GPIB上電壓規(guī)模和靈敏度： DC～100MHz： 20mVrms～±5Vac+dc 100MHz～200MHz：30mVrms～±5Vac+dc 200MHz～225MHz：40mVrms～±5Vac+dc 輸入調(diào)節(jié)：(CH1選擇)阻抗，耦合： 1MΩ或50Ω综合性爱网，ac或dc 低通濾波器： 100kHzwww网站啪啪啪性交黄，可切換衰減：×1或×10 外部時(shí)基參考輸入： 1，5黄色三级片免费看视频，10MHz 觸發(fā)： CH1黄色视频免费入口处在线观看，對(duì)回升/回升沿觸發(fā)，用信號(hào)電平的百分?jǐn)?shù)或相對(duì)電壓設(shè)置電平亚洲人Jizz日本jiz人，設(shè)置靈敏度至低一级黄色毛片视频免费、中或高閘門和啟動(dòng)：主動(dòng)，手動(dòng)(設(shè)置閘門時(shí)候或分辨率位數(shù))免费看成年人网站；外部进入黄网站有点击进入影院，延遲接口：尺度GP-IB(IEEE 488.1和488.2)，帶SCPI兼容說話久久青草国产免费频观日本；只講RS-232 電源：100-120VAC±10％日本小视频免费，50，60或400Hz±10％ 220-240VAC±10％视频黄片在线，50或60Hz±10％凈重：3kg 尺寸：212.6×88.5×348.3mm

In this paper, a system of ultrasonic on rail utilizing digit signal processing technic is introduced.

文中描述利用數(shù)字信號(hào)處理技術(shù)的鋼軌超聲探傷系統(tǒng)的結(jié)構(gòu)欧亚洲黄色、原理及實(shí)現(xiàn)方法。

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