Figura 7.12 Multiscopul: schema bloc simplificată a părţii specifice osciloscopului hibrid. U Y CS S/T-H ADC MD DAC TC
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1 OSCILOSCOPUL HIBRID CE GP-IB ADC Frecvenţmetru Fazmetru Generator de caractere X Y Z Elemente de comandă şi reglaj Figura 7.1 Multiscopul: schema bloc simplificată a părţii specifice osciloscopului hibrid OSCILOSCOPUL CU MEMORIE DIGITALĂ U Y CS S/T-H ADC MD DAC TC Figura 7.13 ul catodic cu memorie digitală: schema bloc simplificată. CS = condiţionor de semnal; S/T-H = circuit de eşantionare memorare; ADC = convertor analogic digital; MD = memorie digitală; DAC = convertor digital analogic; TC = tub catodic. Electrozi SiO V Si n Separare T 1 T Transfer T 3 T 4 Separare Sarcină electr. Figura 7.14 P CCD: principiul de funcţionare a memoriei cu transfer de sarcină.
2 7-8 U Y CS S/T-H MA ADC MD DAC Y AF Y UNITATE DE TACT ŞI DE COMANDĂ DAC X TC AF X Figura 7.15 catodic cu memorie digitală: schema bloc simplificată. CS = condiţionor de semnal; S/T-H = circuit de eşantionare memorare; ADC = convertor A/D; MA = memorie analogică; MD = memorie digitală; DAC = convertor D/A; AF = amplificator final; TC = tub catodic OSCILOSCOPUL CU MICROPROCESOR Schema bloc a unei prime generaţii de osciloscoape digitale este dată în figura Mem. formă de undă Modul canal suplim. ROM IB Tastatură a a Măsurare analogică a a DAC Buffere AF Y TC AF X Gen. caractere LED-uri Sistem de operare cu microprocesor a = semnal analogic Figura 7.16 cu microprocesor: schema bloc simplificată. Y A CS S/T-H ADC D. Tg. M Date I/O CPU Controller (MC68000) Ck ~ Ext Selecţie trigger Adaptarea ratei S/H Controlul BT şi M IB-P IB-P DMA Mem. dinamică afişaj Y B D. Tg. CS S/T-H ADC INREGISTRATOR FORMĂ DE UNDĂ M Tastatură Afişaj (k k pcs) ANALIZĂ, AFIŞARE ŞI I/O Figura 7.17 ul digital de precizie: schema bloc simplificată. CS = condiţionor de semnal; S/T-H = circuit de eşantionare memorare; ADC = convertor A/D; M = memorie digitală; BT = bază de timp; IB = magistrală de interfaţă; D. Tg. = trigger digital.
3 7-9 a) b) c) d) Figura 7.18 ul digital de precizie: exemplificări ale facilităţilor bazei de timp. C-dă Plotter Plotter C-dă Afişaj Afişaj f.u. de tipărit f.u. de transmis f.u. de afişat f.u. de memorat Operanzi Citire (RD) C-dă circuite de prelucrare f.u. C-dă măsurare Analiză C-dă Disc Scriere (WR) Rezultat f.u. cerută IEEE 488 I/O IEEE 488 Contr. Ext. Unitate Disc f.u. externă Inreg. formă de undă (f.u.) Figura 7.19 ul digital de precizie: schema de lucru a unităţii de afişare, analiză şi I/O.
4 OSCILOSCOPUL DE ÎNALTĂ FRECVENŢĂ CU EŞANTIONARE Forma de unda a semnalului de intrare Impulsurile de esantionare Forma de unda reconstituita pe ecranul osciloscopului cu esantionare Impulsurile de trigger Baza de timp reala Deflexia pe orizontala Figura 7.0 Principiului osciloscopului cu eşantionare: forme de undă explicative. U Y Poartă de eşantionare Amplificator defl. verticală Semnal deflexie verticală (Y) Intrare trigger Impuls de eşantionare Scanare Oscilator autoblocat Generator tens. în rampă Comparator de tensiune Generator tens. în trepte Amplitudine Semnal defl. orizontală (X) Baza de timp Atenuator Figura 7.1 ul cu eşantionare: schema bloc simplificată SONDE PENTRU OSCILOSCOP 9 MΩ Cablu de legătură 3-6 pf 1 MΩ 40 pf Figura 7. Sonda R-C divizoare.
5 MΩ Cablu de legătură 3-6 pf 1 MΩ 40 pf 60nH.5-9 pf 50 Ω 75Ω 00 Ω 9-45 pf Figura 7.3 Sonda divizoare pasivă de înaltă frecvenţă. Intrare FTS FTJ A ca Σ Figura 7.4 Sondă activă: schema bloc simplificată. A Intrare Convertor de impedanţă -1,6 V flotant A 1 15 V flotant 15 V Cale pt. comp. continuă Cale pt. comp. continuă -1,6 V Figura 7.5 Sonda activă model HP 111A: schemă bloc simplificată.
6 7-13 Ka = π = 1,414 ; Kf = = 1,11 π π Ka = ; Kf = Ka = = 1,414 ; Kf = = 1, 11 a) b) c) 1+ m π m Ka = ; Kf = m / Ka = ; Kf = π / Ka = 3 ; Kf = / 3 d) e) f) Ka = 3 ; Kf = / 3 Ka = 3 ; Kf = / 3 Ka = 3 ; Kf = / 3 g) h) i) Ka = ; Kf = 8 / 5 Ka = ; Kf = 8 / 5 Ka = Kf = 1 j) k) l) Ka = Kf = 1 Ka = Kf = 1/ η ; η = τ / T Ka = Kf = 1/ η ; η = τ / T T τ T τ m) n) o) Figura 7.7 Forme de undă mai frecvent întâlnite şi factorii lor de amplitudine şi de formă. a) Undă sinusoidală; b) Undă sinusoidală redresată monoalternanţă; c) Undă sinusoidală redresată bialternanţă; d) Undă sinusoidală modulată în amplitudine; e) Semnal de bătăi între două unde sinusoidale de amplitudini egale; f) Undă triunghiulară; g) Undă triunghiulară redresată; h) Undă în dinte de fierăstrău; i) Undă în dinte de fierăstrău redresat; j) Undă trapezoidală; k) Undă trapezoidală redresată; l) Undă dreptunghiulară; m) Undă dreptunghiulară cu factor de umplere variabil; n) Impulsuri simetrice; o) Impulsuri unipolare.
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