User manual TEKTRONIX R453A

[. . . ] ' ' 1 ST RU CT I 0 UAL Se r ial Num ber Te k tro n ix, Inc . Box 500 0 Beaverto n , Oregon 97005 " Phone : 644-0161 " Cables : Te k tronix 171 . WARRANTYdefective materials and workmanship for one yea r. Tektronix Jnstru me nts are : warranted against . respect, to the - warranty, Any ' . questions w ith mentione d abo ve, shou ld- pe 'taken up with yo u r Tektronix Field' Engineer or re presentative. replacement parts should be directed to the Tektronix Fie l d Office or rep resentativ e in Your area_ This procedure will assu re you' the fastest possible 'service. [. . . ] T h e external blan k ing in put allows an external signal connected to t h e AXIS I NPU T connector to ch ange th e trace intensity . p ositive-going signal connected to t h e AXIS I NPU T connector decreases trace intensity a nd negative-going signal increases trace intensity . T h e , , an d mixed unblan k ing gate signals from th e an d Swee p Generator circuits blan k th e C R T during swee p retrace an d recovery time so th ere is no disp lay on t h e screen . Wh en t h e Swee p Generator circuits are reset an d recovere d (see and Sweep Generator d iscussion for more information), the next trigger initiates th e swee p an d an unblan k ing gate signal is generated by t h e or Swee p Generator circuit th at goes negative to allow t h e emitter current of Q1014 to reac h th e level establish ed by t h e I N T EN SITY control and t h e ot h er blan k ing in puts . T h is configuration provides li n ear, fast output signal wit h minimum q uiesce n t p ower . T he overall -Axis Am plifier circuit is sh unt-feedbac k o p erational am p lifier wit h feedbac k from t he Out put Am plifier stage to t h e In put Am p lifier stage th roug h C1036-C1037- R 1036 . T h e out put voltage is determined by th e in put current times t h e fee dbac k resistor an d is s h ow n by t h e formula : = R fb w h ere R fb is R1036 . T h e unblan k ing in put current c h ange is a pp roximately two milliam peres . T h erefore, t h e out put voltage ch ange is about 60 volts (2 mA 30 . 1 k ) . C1036 a dj usts t h e feedbac k circuit for o ptimum h ig h -fre quency res ponse . ener d io de VR 1043 connected between +75 volts an d +150 volts t h roug h C R 1044, R 1044, an d R 1043 produces +90-volt level at th e cat h o de of VR 1043 . T h is voltage establis h es t h e correct collector level for Q1043 . C R 1045 connected from base to emitter of Q1043 im p roves t h e res ponse of Q1043 to negative-going signals . Wh en t h e base of Q1043 is driven negative to cutoff, C R 1045 is forward Out put Am pl i f i er b iased an d conducts t h e negative-going portion of t h e T h e resultant signal pro duced from th e various in puts by blan k ing signal . T h is provides fast falling edge on t h e t h e In put Amplifier stage is connected to th e base of un b lan k ing gate to quic k ly turn t h e dis p lay off . T he out put unblan k ing gate at t h e emitter of Q1043 is connected to Q1024 t h roug h C1029 an d to t h e base of Q1034 t h roug h R 1024 . T h ese transistors are connected as collectort h e C R T circuit th roug h R 1046 . 3- 2 6 Circuit Description-453/ R 453A C RT General CI R C U IT T h e C R T Circuit provides th e hig h voltage and co n trol circuits necessary for o peration of th e cat h o d e-ray tube (C R T) . sc h ematic of t h is circuit is sh ow n on d iagram 16 at th e rear of t h is manual . later w h en C913 discharges sufficiently to raise t h e voltage at th e base of Q930 positive enoug h to bias Q930 i n to conduction agai n . T h e am p litu d e of sustained oscillatio n de pen ds upon t h e average current delivered to t h e base of Q930 . High-Voltage Oscillator Q930 and associated circuitry comprise t h e h ig h -voltage oscillator to prod uce th e drive for hig h -voltage transformer instrume nt is tur n ed on, t h e current 930 . T h e collector current of Q930 i n creases and voltage is develo ped across t h e collector windi ng of 930 . feed Th is prod uces corresponding voltage increase i n b ack winding of 930 wh ic h is con n ected to t h e base of Q930, and it conducts eve n h arder . Wh ile Q930 is on, its base cu rrent exceeds t h e current t h roug h R 925 and C913 c h arges negatively . Eventually t h e rate of collector current increase i n Q930 becomes less t h an t h at re q uired to mainouttain t h e voltage across t h e collector winding, an d put voltage d rops . T h is turns off Q930 by way of t h e feedback voltage to t h e base . [. . . ] Eff Disc Q t 2 1 2 1 1 2 2 1 2 2 2 4 zss FR AME, rail Descri p tion each frame in cl u des: NU T, sp ee d g r ip retainer, 0. 25-20 in ch SC REW, cabinet latc h mo u nting h ardwa r e fo r eac h : ( n ot in cl ude d /screw) R IN G, retai n i ng CO VER, line voltage selector cover in cl ud es : HOL DER, fu se, plastic mo un ti ng hard ware fo r each : (not in cluded /h ol der) . 25 SC REW, thread cu ttin g, 4-40x0 in ch , PH S BODY, line voltage selector mo un ting hardwa re: (not incl uded /bo dy) SC REW, 6-32x0 i n ch , PH S . 625 WAS HER, lock , in te rn al, 0. 146 lD 0. 283 inch OD NU T, h ex . , 6-32x0 i n c h . 25 cabi n et, /cord wrap mo u nting har dwa r e fo r each : (n ot incl u ded /foot) SC REW, 8-32 1 . 25 i n ch , PH S POST, 0. 188 ID 0. 26 OD 1 . 03 in c h long FOOT, -----210-0006-00 210-0407-00 348-0258-00 212-0082-00 129-0294-00 ------ - 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 161-0033-07 358-0323-00 129-0064-00 -----210-0457-00 210-0203-00 358-0181-00 129-0020-00 -----200-0072-00 355-0503-00 -----220-0410-00 346-0043-00 386-1122-00 -----211-0504-00 CO R D, power, 3 cond u ctor BU SH IN G, strain relief POST, bin di n g mo un ting har dware : (n ot in clu ded /p ost) . 312 NU T, k eps, 6-32x0 inch LU G, solder, S E #6, long BU SH IN G, plastic BI N DI N G POST -51 -52 -53 -54 -55 -56 ASSEMBLY bi n ding post assembly in cl u des : CA P, bindi n g post ST EM , ada pter mo un ting hardware: (n ot in cl u ded / b in di n g post assembly) . 375 NU T, keps, 10-32x0 in ch ST R AP , go u nd PL AT E, power co rd mo u nting har dware : (not inclu ded /p late) SC REW, 6-32x0 inch , PH S . 25 Mechanical Parts FIG URE 4 453 FRAME & CAB I NE T (co n t ) F ig . 4-57 -58 -59 -60 -61 -62 -63 380-0082-00 -----213-0107-00 378-0036-01 386-1187-00 426-0317-01 -----212-0506-00 179-1140-00 Se rial/Mo d el No . Eff Disc Q t 1 4 1 1 1 4 1 List-453 / R453A 1zss Desc r iptio n H O U SI N G, fa n filte r mo un ting h a rd ware : ( not i n cl ud e d / h o u si n g) . 25 SC REW, t hr ead fo r ming, 4-40x0 inc h, 100° cs k, FH S F I LT ER, air P A NEL, r ea r S UBP A NEL, rea r mo u nting h a rdwa re : (n ot i n clu d ed /s u bpan el) SC REW, 10-32x0 i n c h , 100° csk, FH S . 375 WIRING HA RNESS, /con necto r s, line voltage 9-24 Mechanical Pa rts List-453 / R453A F IG URE 5 R453A CA B I NE T Fig . 5-1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 -15 -16 -17 -18 -19 -20 -21 -22 -23 -24 -25 -26 -27 -28 -29 Te k tronix Part No . [. . . ]