First it produces the pulse signal by the multivibratorwhich is consisted of 555 timer and send in the detecting coil to form the alternating magnetic field, then it asopts UGN3503 linear half-effect as prode to the magnetic field change into the voltage signal change,after enlargement electric circuit and peak value examination electric circuit,the signal be treated to send into ADC0809 modulus converter change moduluses, then the digital signal after the modulus converter is changed is sent into AT89C51one-chip computers afterwards, after the digital filter, AT89C51one-chip computers afterwards compares the data to the reference voltage and judges whether to have detected the metal and alarm.

這個(gè)系統(tǒng)是以AT89C51單片機(jī)為核心www.超碰在线，首先由555定時(shí)器構(gòu)成多諧振蕩器產(chǎn)生脈沖信號(hào)送入探測(cè)線圈以形成交變磁場(chǎng)国产在线3p，然后經(jīng)過(guò)線性霍爾器件UGN3503將磁場(chǎng)變化轉(zhuǎn)換為電壓信號(hào)的變化试看120秒国产很黄很爽，經(jīng)過(guò)放大電路和峰值檢測(cè)電路97免费人妻视在线视频，經(jīng)數(shù)模轉(zhuǎn)換之后輸入到單片機(jī)中，由單片機(jī)對(duì)數(shù)據(jù)進(jìn)行軟件濾波之后又粗又长的黄A片无码视频，與基準(zhǔn)值比較之后欧美欧美视频a√在线，判斷是否存在金屬和報(bào)警顯示。

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.

根據(jù)強(qiáng)磁場(chǎng)電源的需求卡通动漫综合图区第1页，參考源應(yīng)按照軟件設(shè)定的斜率逐漸上升到設(shè)定穩(wěn)態(tài)值大黄色视频试看60秒毛片，則參考源系統(tǒng)應(yīng)由數(shù)字給定和數(shù)模轉(zhuǎn)換電路兩大部分組成，而參考源的穩(wěn)定度主要依靠完成數(shù)模轉(zhuǎn)換功能的模擬電路的性能來(lái)保證黄色视频9999，因此本文對(duì)參考源系統(tǒng)的研究以數(shù)模轉(zhuǎn)換電路為重點(diǎn)，分別從電路方案的確定国产在线精品一区在线观看、數(shù)模轉(zhuǎn)換芯片及其基準(zhǔn)電壓源的選取和驗(yàn)證国产强奸视频大全、電路板硬件抗干擾和PCB設(shè)計(jì)幾方面進(jìn)行了論述，然后對(duì)數(shù)字給定部分的遠(yuǎn)控組態(tài)和PLC程序設(shè)計(jì)作了簡(jiǎn)要介紹欧美性free；采用零磁通原理的直流電流轉(zhuǎn)換器很好地滿足了對(duì)負(fù)載電流檢測(cè)單元高穩(wěn)定度的需求九色911最新地址，本文詳細(xì)分析了零磁通檢測(cè)的原理亚洲中文AⅤ中文字幕在线，并在選定此種類(lèi)型電流轉(zhuǎn)換器的基礎(chǔ)上設(shè)計(jì)了一套檢測(cè)長(zhǎng)期穩(wěn)定度的方案，8小時(shí)內(nèi)以1秒為采樣周期看片人人操，通過(guò)計(jì)算機(jī)Labview程序和高精度數(shù)字電壓表的GPIB通訊6080免费毛片在线播放，將被高精度數(shù)字電壓表數(shù)字化后的模擬信號(hào)采樣值連續(xù)記錄至計(jì)算機(jī)中；比較放大環(huán)節(jié)簡(jiǎn)要闡述了漂移產(chǎn)生的原因和相關(guān)參數(shù)指標(biāo)在线超碰在线，確定了具體的減法電路形式国产熟女丝袜视频一区草草影院，并根據(jù)誤差分析理論對(duì)運(yùn)算放大器和外圍元器件進(jìn)行了選取和驗(yàn)證。

With experience gained from the Finite Element method, a quasi-linear model based on the Magnetic Equivalent Circuit method has been used to obtain the static torque of the motor. Three types of magnetic tubes are employed in the model, and through the exchange principle of magnetic lines of force and magnetic equipotential line, the tube in which the flux distribution is non-uniform is applied to the model.

通過(guò)分析電機(jī)二維磁場(chǎng)分布和考慮電機(jī)特殊的電磁結(jié)構(gòu)日夲人真人爱三级片无码毛片，提出了用三種磁通管單元來(lái)近似磁場(chǎng)分布在线A片中文亚洲，并借用磁力線和等磁位線互換的方法，將磁力線分布不均勻的磁通管引入到分析模型中性爱在线视频不卡酷酷网，有效的處理了平動(dòng)式嚙合電動(dòng)機(jī)中的磁場(chǎng)分布不均勻和磁路局部飽和五月天天久久综合，使分析模型得到簡(jiǎn)化并兼顧了求解精度。

Magnetic induction intensity's signal which the removable Hall probe head will examine using the monolithic integrated circuit technology demonstrated on the lattice screen, moves the Hall probe head in the magnetic field then the magnetic field distribution rule demonstrates the Helmholtz coil axis on by the curve and the number form obviously.

利用單片機(jī)技術(shù)將可更換的霍耳探頭所檢測(cè)到的磁感應(yīng)強(qiáng)度的信號(hào)顯示到點(diǎn)陣屏上毛片黄色视频在线，在磁場(chǎng)中移動(dòng)霍耳探頭即可將亥姆霍茲線圈軸線上磁場(chǎng)分布規(guī)律以曲線和數(shù)顯的形式顯示出來(lái)可以看性爱视频的网站。

Multi-meter operations and Basic DC circuits, Oscilloscope Operation, Function, Generator Operations, RC circuits, RL circuits, Rectifier circuits, Rectifier circuits and Voltage doublers, Ohm's Law, RC 、 RL Circuit, RLC Circuit, Diode Lab - Part 1, Diode Lab - Part 2, Measurement of Force Effects in the Electric Field, Basic Current Balance, Force Effect of Currents, Measurement of Magnetic Field of Single Coils, Magnetic Fields of Paired Coils in Helmholtz Arrangement, Hall Effect in p-Ge/n-Ge, Faraday's Law, Transformers, Microwave I, Microwave II.

電磁學(xué)實(shí)驗(yàn)( S0339)(1免费的福利A片网站，1)基本電子零件久久毛片视频、直流電路，示波器與信號(hào)產(chǎn)生器的認(rèn)識(shí)與使用怎样免费在线观看黄色视频，電容欧美的天堂wwwwww、電感的電路特性，整流與濾波igao网，倍壓整流電路国产乱伦熟女视频，歐姆定律實(shí)驗(yàn)，電容一免费级做a爰片久久毛片A片、電感的電路特性欧美日韩性爱成，電阻、電容国产无码视频麻豆、電感的電路特性午夜福利国产a，二極體的特性實(shí)驗(yàn)，二極體的特性實(shí)驗(yàn)欧美特黄特级作爱大片www、電場(chǎng)力效應(yīng)實(shí)驗(yàn)无码不卡在线观看网站视频、電流天平實(shí)驗(yàn)、電流力效應(yīng)實(shí)驗(yàn)欧美性午夜福利、螺線管磁場(chǎng)實(shí)驗(yàn)在线观看国产美乳视频网站大全免费、赫姆霍茲磁場(chǎng)實(shí)驗(yàn)、霍爾效應(yīng)實(shí)驗(yàn)、法拉第感應(yīng)電動(dòng)勢(shì)實(shí)驗(yàn)思思精品视频导航、感應(yīng)線圈變壓實(shí)驗(yàn)www.欧美av影院.com/、微波實(shí)驗(yàn)一、微波實(shí)驗(yàn)二免费女自慰喷白浆自慰网站。

Main features:- Hole spacing 2.25mm-operating voltage: 4.5 V to 24 V-switching offset compensation at 62Hz under - over-voltage Protection - VDD-pin Reverse voltage protection - Short circuit protection open-drain output is hot off - working magnetic field range: DC to 10kHz-output goes low with magnetic south pole contacts marked on the package side, while the higher magnetic flux density and area of S1, As S2-all temperature and supply voltage range magnetic parameters on-chip temperature compensation circuitry of the minimum drift - EMC meet DIN40839.

主要特點(diǎn)：–霍爾片間距2.25mm–工作電壓： 4.5 V 至 24 V–開(kāi)關(guān)偏移補(bǔ)償在62Hz下–過(guò)電壓保護(hù)– VDD-pin反向電壓保護(hù)–短路保護(hù)漏極開(kāi)路輸出被熱關(guān)斷–工作磁場(chǎng)范圍：直流到10kHz–輸出變低用磁場(chǎng)南極接觸封裝上有標(biāo)記邊国产又粗又大又爽又免费，而更高磁通量密度面積S1，如同S2–全溫度和供電電壓范圍下磁參數(shù)的片上溫度補(bǔ)償電路的最小漂移– EMC適應(yīng)DIN40839一区高清精品视频在线观看。

In the paper, the magnetic flexibility torque survey tool is composed of the magnetic flexibility torque sensor and following measure circuit, and based on magnetic flexibility principle of the iron-magnetism material.

本文研究的磁彈性轉(zhuǎn)矩測(cè)量?jī)x由磁彈性轉(zhuǎn)矩傳感器和后續(xù)測(cè)量電路組成久久性AV，它是利用鐵磁材料的磁彈性效應(yīng)測(cè)量轉(zhuǎn)矩的儀表。

During the motion process, the stagnation and back commutation occur and worsen the performances of circuit breaker. According to the real interruption process, a three-dimensional(3-D) model of arc motion under the effect of external magnetic field is built based on magnetohydrodynamic, which can predict the restriking phenomena. With air vents opened to 60%, the restriking phenomena occur under 3mT magnetic field; when the magnetic field is increased to 5mT, the restriking phenomena disappears.

該文以磁流體動(dòng)力學(xué)為基礎(chǔ)建立了三維空氣電弧等離子體在外部磁場(chǎng)作用下運(yùn)動(dòng)的數(shù)學(xué)模型成品直播大全免费观看网站视频下载，此模型可以預(yù)測(cè)電弧的重?fù)舸┈F(xiàn)象國產無碼色視頻在線，并發(fā)現(xiàn)當(dāng)滅弧室的出口面積為60%時(shí)，電弧在3mT磁場(chǎng)的作用下運(yùn)動(dòng)時(shí)出現(xiàn)了重?fù)舸┈F(xiàn)象毛片无毒不卡，而當(dāng)磁場(chǎng)增大到5mT時(shí)重?fù)舸┈F(xiàn)象消失AAAAAAAAA欧美A片。

A much larger detecting area could be acquired by combining a number of UGN3503U with a special circuit to form a magnetic sensor array, and this new kind of magnetic sensor array could be widely used for detecting the metal defects in long distance buried pipeline and oil tank floor by magnetic flux leakage method.

該陣列的磁敏感區(qū)域是UGN3503U測(cè)量區(qū)域的數(shù)倍并且有較高的測(cè)量靈敏度和線性度，在將其制成傳感模塊的情況下可以用于在役長(zhǎng)輸管道和油罐等大型設(shè)備的漏磁探傷国产精品女视频一区二区。

This paper describes the structure of the DC transmission circuit, characteristics of circuit magnetic fields and their effects on the ore-prospecting magnetic survey.

本文闡述了直流輸電線路的結(jié)構(gòu)伊人欧美在线视频免费版观看网址、線路磁場(chǎng)特征及對(duì)以地質(zhì)找礦為目的的磁測(cè)工作的影響。