US2752527A - Method of magnifying waveforms on a cathode-ray tube and circuit therefor - Google Patents

Method of magnifying waveforms on a cathode-ray tube and circuit therefor Download PDF

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US2752527A
US2752527A US374871A US37487153A US2752527A US 2752527 A US2752527 A US 2752527A US 374871 A US374871 A US 374871A US 37487153 A US37487153 A US 37487153A US 2752527 A US2752527 A US 2752527A
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cathode
means
tube
ray tube
amplifying device
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US374871A
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Richard L Ropiequet
Clifford H Moulton
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Tektronix Inc
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/22Circuits for controlling dimensions, shape or centering of picture on screen
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00Arrangements for displaying electric variables or waveforms
    • G01R13/20Cathode-ray oscilloscopes ; Oscilloscopes using other screens than CRT's, e.g. LCD's
    • G01R13/22Circuits therefor
    • G01R13/32Circuits for displaying non-recurrent functions such as transients; Circuits for triggering; Circuits for synchronisation; Circuits for time-base expansion

Description

June 26, 1956 R L ROPIEQUET ET AL 2,752,527

7 METHOD OF MAGNIF'YING WAVEFORMS ON A CATHQDE-RAY TUBE AND CIRCUIT THEREFOR Filed Aug. 18, 195.3

MAG- NORM SWEEP G EN ERATOR SWEEP GENERATOR IN VEN TORS Rich are L Popz'e q u e Z y G; CJifford H. Moulfon United States Patent Ofifice 2,752,527 METHOD or Mironunvmo WAvEFonMs' ON A @A'lIiUDE-RAY TUBE AND CIRCUIT THERE- FUR Richard L. Ropiequet and (CliifordH. Moulton, Portland,

Oreg'.,. assignors toTelrtronix, Inc., Portland, reg., a corporation of Oregon Application August 18, 1953, Serial No. 374,871 12 Claims. (Cl. 315-26) This invention pertains to the magnification of waveforms on a cathode-ray tube, and relates particularly to a method and circuit for magnifying any desired portion of a waveform and positioning the same at the center or any other area of the cathode-ray tube screen.

It is a principal object of thepresent invention to.pro'

vide a method and circuit by which any portion of a Waveform desired to be analyzed may be magnified to any desired. extent and adjusted to any desired position on the cathode-ray screen.

Another important object of this invention is the provision of a method and circuit for positioning a magnified waveform at any desired position on a cathode-ray tube screen. I

A further important'object' of the present invention is to provide a method and circuit by which a normal or magnified waveform may be positioned on a cathode-ray tube screen by means of a single control.

The foregoing and other objects and advantages of the present invention will appear from the following detailed description takenin connection with the accompanying drawings, in which; t

Figure 1 is a schematic diagram showing one'form' of electrical circuitry embodyingthe features of the present invention; v

Figure 2 is a schematic diagram of a modified forin of electrical circuitry" embodying the features of this invention; and h p 7 I v Figure 3isa graph showing the magnification results ofth e circuitsshown in Figures 1 and 2.

Stated broadly, the method and circuit of'the present invention involves af feedback network between a sweep generator and the ani'plifying'system' preceding the oathode-rayti1lie deflection plates; wherein means isprovided in saidfeedbacknetwork for'v'arying tlie gainof'the output amplifier, and' wherein-means is provided ahead of the feedback networkdor controlling the horizontal positionflonthewaveform on the cathode-ray: tube screen.

R'ef'er'ringto Figure 1'of'thedrawing;thereis shown in block, form a-- sweep gener'atorjill) of any conventional designwell lno'wn' in the arti for producing a sawtooth waveform time ba'se'fo'r a cathode ray'tube (n'otsh'own); The output of the sweep generator is connected to the grid llilof cathode follower" tube V1. Thep'lateflfl of this cathode ro'nwer tubeisconnected to a positive. po; tential, as shown Tl iecathode 1 3 is'*connected through resistance 14 to a negative potential, as shown, and thrbngh the pa'rallel combination of resistance 'l and capacitor 1640 the grid 17 of cathode follower V2. The'grid 17 is also connected thron'gh'-= poterrtiometer 1 -8to"a nega tive 1 potential and to ground This potentiometer fun'c tions to I vary the-voltage;- on grid-17, whereby topositior'ta desired part ofthe sweep o'rf-"thecat-l:1'ode-ray tube screen.- Calhode follower V2 fi1n"ctions' to prevent grid current from flowing in the cireuit of impedance- 15, 16?:

The pl'a'te 1-9 of tHbeNZ is connected=Fto a positive a tential, as shown, and the cathode 20 is connected through 2 resistance to a negative potential. The cathode 20 of tube V2 is also connected through the parallel combination of resistance 22 and capacitor 23' to the grid 24 of cathode follower tube V3. The plate 25 of tube V3,

ode 29' of this tube is connected through potentiometer 30 to the cathode 31 of another amplifier tube V5, said cathodes 29 and 31 being' also connected through-the respective resistances 32, 33 to the negative potential, as indicated. The grid 34' of tube V5 is grounded through resistance 35. p a

The function of cathode follower tube V3 is to prevent grid current from charging the feedback network capacitor 213', thus avoiding long recovery time. Potentiometer 30 functions as a degenerative control between the cathodes 2.9 and 31 of the respective amplifier tubes V4 and V5 to act the magnification gain to the precise value desire e The plate 56 of tube V4 is connected through resistance 37. to' a positive potential, as shown, and also to the grid 38 of cathode follower tube V6. The plate 39 of. tube V6 is connected to a positive potential and the cathode i0 is connected through resistance 41 to ground. In similar manner, the plate 420i tube V5 is connected through" resistance 43 to a positive potential and to the grid 44" of cathode follower tube V7. The plate 45 of tube V7 is connected to the positive potential indicated and the cathode'46' is connected through resistance 47 to ground.

The plate 36 of amplifier tube V4" is also connected through the impedance comprising the' parallel combination of resistance 48 and capacitor 49 and'through resistance 50 and. prot'entiometer' 51 to a negative potential, as shown, and through said potentiometer and resistance 52 t0 gIQund.

Potentiometer 51 functions to set the D. C. level of cathode followerf tube V3 at the same level for both magnifying and normal positions, and is employed to adjust the partof thet'race which is magnified to center the latter upon the cathode-ray tubescreen.

Plate 36 is also connected through impedances 48, 49" andswitch 53 to the' grid 24 ofcathode follower tubeV3. The switch is movable between the MAG and- NORM positions and functions in-sucli manner that the amplifier operates at full gain when the switch is in the MACipositiom However, when the switchisin the NORM position a degenerative feedback network is placed between the plate 36 and grid- 28 0farnplifier tube-V4 via the cathode follower V3. The value of resistance 22 and'capacitor' 2-3 may be chosen to provide gain factors of any magnitude desired. The gain may also be varied bychanging themagnitude of resistances 48 and-50, but the former procedure-is I preferred.

Potentiometers 18 and 51 function in such'manner' as to equalize the potentials-at junctions 54 and 55 while simultaneously adjustingthepotential at plate 36of amplifier tube v l to a value at which-the trace is presented at the'desired position on the cathode-ray tube screen. In practice this potentialis preferably established to center the trace on the screen. In any event the trace is main tained at the selected position on'the screen in both magn-ified and u'nma'gnifiedconditions since the potentials at terminals 54? and- 55 'are' maintained equal.

The cathodes 46 and 46 of the respective cathode" foll'ower tubes-V6' and V7-a re connected to the deflection plate's D-of a cathodeqaytubetnot shown). These cath' ode followers isolate the deflection plate capacity from Patented June 26, 1956 the plate of the amplifier tubes and increases the bandwidth of the latter by a factor of about three times. The improved frequency response provides for increased linearity of the sweep on the higher range.

The operation of the magnifying circuit described hereinbefore is as follows: Let it be assumed that the ratio of resistances 48 and 22 is so chosen that the gain of amplifier tube V4 is reduced by a factor of five when switch 53 is in the NORM position, as compared with the gain when the switch is in the MAG position. With the cathodes 40, 46 of the output cathode follower tubes V6 and V7, respectively, connected to the horizontal deflection plates of a cathode-ray tube (not shown) and switch 53 placed in the MAG position, potentiometer 18 is adjusted to set either the start or the end of the trace at the center of the screen. Switch 53 is then moved to the NORM position and potentiometer 51 is adjusted to bring the same part of the trace, i. e. the start or the end thereof, at the center of the screen. Precise adjustment of magnification to exactly five times the normal time base is achieved by adjusting potentiometer 30, as explained hereinbefore.

Referring now to Figure 2 of the drawing, the sweep generator 59 output is connected through the parallel combination of resistance 60 and capacitor 61 to the grid 62 of cathode follower V8. The plate 63 is connected to a positive potential, as indicated, and the cathode 64 is connected to the cathode 65 of the diode connected tube V9. The grid 66 and plate 67 are connected together and through resistance 68 to a positive potential. The cathodes 64 and 65 are connected through resistance 69 to a negative potential, as shown.

The output of tube V9 is connected to the grid 70 of amplifier tube V10. The plate 71 of this amplifier tube is connected through resistance 72 to a positive potential, and through the parallel combination of resistance 73 and capacitor 74 to the grid 75 of cathode follower tube V11. The plate 76 of cathode follower tube V11 is connected to a positive potential and the cathode 77 thereof is connected through resistance 78 to a negative potential and through resistance 79 to the control grid 80 of the output amplifier tube V12. The grid 75 of cathode follower tube V11 is connected through resistance 81 to a negative potential.

The grid 62 of cathode follower tube V8 is connected through resistances 82 and potentiometer 83 to a negative potential and to ground, as shown. Horizontal positioning of the sweep on the cathode-ray tube screen is achieved by adjustment of potentiometer 83 which controls the negative voltage return of the grid circuits of cathode follower V8 and amplifier tube V12.

The cathode 84 of amplifier tube V12 is connected to the cathode 85 of the cooperating amplifier tube V13, and also through variable resistance 86 to a negative potential. This resistance functions to set the quiescent state current level of the coupled cathodes 84 and 85. The grid 87 of tube V13 is connected through the parallel combination of variable capacitor 88 and potentiometer 89 to ground and also through potentiometer 90 to a negative potential, as shown. The plate 91 of amplifier tube V12 is connected through resistance 92 to a positive potential and also to the grid 93 of cathode follower tube V14. The plate 94 of this cathode follower tube is connected to a positive potential and the cathode 95 thereof is connected through resistance 96 to ground.

In similar manner, the plate 97 of amplifier tube V13 is connected through resistance 98 to a positive potential and also to the grid 99 of cathode follower tube V15. The plate 100 of tube V15 is connected to a positive potential and the cathode 101 thereof is connected through resistance 102 to ground. The cathodes 95 and 101 of cathode follower tubes V14 and V15, respectively, are connected to the horizontal deflection plates D of a cathoderay tube (not shown).

A pair of switches 103 and 104 are connected, respectively, to the grid 62 of cathode follower V8 and to the cathode 77 of cathode follower V11. These switches function to removably insert between them any one of a plurality of impedances comprising the parallel combinations of resistance 105 and capacitor 106, resistance 107 and capacitor 108, and resistance 109 and capacitor 110. These impedances each complete a degenerative feedback network between the plate 71 and grid 70 of amplifier tube V10, the network being formed through tubes V11, V8 and V9. The amount of feedback is determined by the voltage division of the voltage divider comprising impedance 60, 61 and one of the switched impedances.

The function of cathode follower tube V8 is to prevent grid current from flowing in the feedback network. Since the cathodes 64 and 65 are connected together and since the plate 67 of the diode connected tube V9 is connected to the grid 70 of amplifier V10, the plate 67 follows the grid 62 of cathode follower V8 until grid current starts to flow in amplifier tube V10. At this time grid current flows through resistance 68 to hold the diode plate 67 at a fixed voltage level while the cathode rises past it.

In the operation of the circuit shown in Figure 2, there is a value of voltage derived at the plate 71 of amplifier tube V10 at which the voltages at junctions 111 and 112 are identical. Accordingly, this potential will result in a certain output potential being positioned at a certain point on the screen, and this output potential will remain in fixed position under all conditions of magnification provided by the switched impedances. Potentiometer 90 may then be adjusted to shift the established potential to any desired position on the screen, for example to the center of the screen. As previously explained, the gain of amplifier tube V10 may be adjusted by switching in any desired value of impedance into the feedback network when the potentials at terminals 111 and 112 are equalized. For example, impedance 105, 106 may establish the normal gain of the amplifier, While impedance 107, 108 increases the gain by a factor of three and impedance 109, increases the gain by a factor of ten. In this manner, a waveform to be analyzed may be viewed in its normal size or it may be magnified to three times or to ten times its normal size. In all cases the waveform is maintained at the selected position on the screen.

By way of exemplifying the foregoing description, Figure 3 illustrates a normal size waveform 115 positioned at the exact center of the cathode-ray tube screen. This waveform is produced in the circuitry of Figure 1 when switch 53 is in the NORM position and in the circuitry of Figure 2 when impedance 105, 106 is inserted in the feedback network described hereinbefore. Waveform 116 is expanded to three times the normal waveform and is produced by the circuit of Figure 2 by inserting impedance 107, 108 in the feedback network, while waveform 117 is magnified to five times the size of the normal waveform and is produced in the circuit of Figure 1 by switching switch 53 to the MAG position. The waveform 118, magnified to ten times the size of the normal waveform, is produced by switching impedance 109, 110 into the feedback network of the circuit shown in Figure 2.

It will be observed from the foregoing description that in both of the circuits of Figures 1 and 2 various magnifications are achieved by providing a feedback network between theplate and grid of an amplifier tube and changing the impedance value of said feedback network to correspondingly vary the gain of the sweep amplifier.

It will be noted in the foregoing illustrations that magnification of the portion of the time base, and hence the portion of the waveform to be analyzed, was described as being preferably effected at the center of the cathode-ray tube screen. However, it will be understood that magnification may be effected at any other place on the cathode-ray tube screen, as may be desired.

Various other modifications and changes may be made in the details of construction described hereinbefore without departing from the scope and spirit of the present 1. A method of magnifying a portion of a time; base:

on. a cathode-ray tube screen wherein the cathode'ray tube. includes deflection platesand-an amplifier connecting the latter to a timebase source,. said method.comprisingfeeding the amplifier output signal: back to the amplifier input, providing said feedback pathwithspaced points of equal potential, and varying the impedance. between said spaced points, whereby to vary the gain. of the amplifier andcorresp ondingly magnify said portion of the time base.

2. A method of magnifying aportion of .a time base on acathode-ray tube screeni wherein thecathode-ray tube includes deflection plates, and-an amplifier'connecting, the latter to-a time;base-source, said methodcoming feeding the amplifier output back to the amplifier. input, providing said feedback path with spaced points of equalpotential when the potential of the amplifier output is located at the desired position on the cathoderay tube screen, and varying the impedance between said spaced points, whereby to vary the gain of the amplifier and correspondingly magnify said portion of the time base.

3. In combination with a cathode-ray tube having deflection plates and meansfor generating a time" base, means for magnifying a portion of said'time base, said magnifying means comprising anelectron discharge amplifying device having a cathode, a grid and a plate, cathode follower means interconnecting the amplifying device and the time base generating means and forming a feedback path from the amplifying device, spaced points in said feedback path, circuit means associated with said spaced points for establishing equal potentials at said spaced points, impedance means connected between said spaced points in the feedback path to vary the gain of the amplifying device and correspondingly vary the magnification of the time base, and means connecting the output of the amplifying device to the deflection plates of the cathode-ray tube.

4. In combination with a cathode-ray tube having deflection plates and means for generating a time base,

means for magnifying a portion of said time base, said magnifying means comprising an electron discharge amplifying device having a cathode, a grid and a plate, a first cathode follower means interconnecting the amplifying device and the time base generating means and forming a feedback path from the amplifying device, spaced points in said feedback path, circuit means associated with said spaced points for establishing equal potentials at said spaced points, impedance means connected between said spaced points in the feedback path to vary the gain of the amplifying device and correspondingly vary the magnification of the time base, and second cathode follower means connecting the output of the amplifying device to the deflection plates of the cathode-ray tube.

5. The combination of claim 4 including a second electron discharge amplifying device having a cathode and a plate, adjustable resistance means interconnecting the cathodes of the first and second amplifying devices, and third cathode follower means connecting the output of the second amplifying device to a deflection plate of the cathode-ray tube.

6. In combination with a cathode-ray tube having deflection plates and means for generating a time base, means for magnifying a portion of said time base, said magnifying means comprising an electron discharge amplifying device having a cathode, a grid and a plate, cathode follower means interconnecting the amplifying device, and the time'base generating" means and forni ing afeedback path from thetamplifying, device, spaced points in said feedback path, circuit means associated withsaid spaced: points forv establishing equal potentials at said spaced points, impedance means, switch means for removably inserting the impedance means: between- I said spaced points in the feedback path, whereby to vary the gain of the amplifying device and correspondingly vary the magnification of the time base, and means con meeting the output of the amplifying device to the de= flection plates of the cathode-ray tube.

7. In combination with a cathode-ray tube having,

deflection plates andmeans for generating a time base, means for magnifying a portion of said. time base, said magnifying means comprising an electron" discharge amplifying device having a cathode, a grid and a-plate,

cathode follower means interconnecting the amplifying-v device and the time base generating means and form ing a feedback path from the amplifying device, spaced points in said feedback path, circuit means associatedwith said spaced points for establishing. equal potentials at said spaced points, impedance means connected. between said spaced points in the feedback pathto vary the gain of the amplifying device and correspondingly vary the magnification .of the time base, means connecting the output of the amplifying device to the dc flection plates of the cathode-ray tube, and adjustable resistance means between'the time base generating means-v and the cathode follower interconnecting means for varying the position of the'magnified and unmagnifiedtirne base on the cathode-ray tube screen.

8. In combination with a cathode-ray tube having deflection plates and means for generating a time base, meansfor magnifying a portion ofsaid time-base,- said magnifying means comprising an. electron discharge amplifying device having a cathode, a grid and a plate,- cathode follower means interconnecting the amplifying device and the time base generating means and forming a feedback path from the amplifying device, spaced points in said feedback path, circuit means associated with said spaced points for establishing equal potentials at said spaced points, impedance means connected between said spaced points in the feedback path to vary the gain of the amplifying device and correspondingly vary the magnification of the time base, means connecting the output of the amplifying device to the deflection plates of the cathode-ray tube, adjustable resistance means between the time base generating means and the cathode follower interconnecting means for varying the position of the magnified and unmagnified time base on the cathode-ray tube screen, and second adjustable resistance meansconnected to the amplifying device for adjusting themagnified and unmagnified time base at the same position on the cathode-ray tube screen.

9. In combination with a cathode-ray tube having deflection plates and means for generating a time base, means for magnifying a portion of said time base, said magnifying means comprising an electron discharge amplifying device having a cathode, a grid and a plate, first cathode follower means interconnecting the amplifying device and the time base generating means and forming a feedback path from the amplifying device, spaced points in said feedback path, circuit means associated with said spaced points for establishing equal potentials at said spaced points, impedance means, switch means for removably inserting the impedance means between said spaced points in the feedback path, whereby to vary the gain of the amplifying device'and correspondingly vary the magnification of the time base, second cathode follower means connecting the output of the amplifying device to the deflection plates of the cathode ray tube, adjustable resistance means between the time base generating means and the first cathode cathode-ray tube screen, and second adjustable resistance means connected to the amplifying device for adjusting the magnified and unmagnified time base at the same position on the cathode-ray tube screen.

10. In combination with a cathode-ray tube having deflection plates and means for generating a time base, means for magnifying a portion of said time base, said magnifying means comprising an electron discharge amplifying device having a cathode, a grid and a plate, first cathode follower means interconnecting the amplifying device and the time base generating means and forming a feedback path from the amplifying device, spaced points in said feedback path, circuit means associated with said spaced points for establishing equal potentials at said spaced points, impedance means connected between said spaced points in the feedback path to vary the gain of the amplifying device and correspondingly vary the magnification of the time base, second cathode follower means connecting the output of the amplifying device to a deflection plate of the cathode-ray tube, adjustable resistance means between the time base generating means and the first cathode follower interconnecting means for varying the position of the magnified and unmagnified time base on the cathode-ray tube screen, second adjustable resistance means connected to the amplifying device for adjusting the magnified and unmagnified time base at the same position on the cathode-ray tube screen, a second electron discharge amplifying device having a cathode and a plate, adjustable resistance means interconnecting the cathodes of the first and second amplifying devices, and third cathode follower means connecting the output of the second amplifying device to a deflection plate of the cathode-ray tube.

11. In combination with a cathode-ray tube having deflection plates and means for generating a time base, means for magnifying a portion of said time base, said magnifying means comprising an electron discharge amplifying device having a cathode, a grid and a plate, cathode follower means conductively interconnecting the amplifying device and the time base generating means and forming a feedback path from the amplifying device, means in the feedback path to vary the gain of the amplifying device and correspondingly vary the magnification of the time base, and means connecting the output of the amplifying device to the deflection plates of the cathoderay tube.

12. In combination with a cathode-ray tube having deflection plates and means for generating a time base, means for magnifying a portion of said time base, said magnifying means comprising an electron discharge amplifying device having a cathode, a grid and a plate, cathode follower means conductively interconnecting the amplifying device and the time base generating means and forming a feedback path from the amplifying device, impedance means, switch means for removably inserting the impedance means in the feedback path, whereby to vary the gain of the amplifying device and correspondingly vary the magnification of the time base, and means connecting the output of the amplifying device to the deflection plates of the cathode-ray tube.

I References Cited in the file of this patent UNITED STATES PATENTS 2,230,819 White Feb. 4, 1941 2,244,013 Knoop J 3, 19 2,309,672 Schade Feb. 2, 1943 2,407,898 Norgaard Sept, 17, 1946 2,412,210 Edson et a1. Dec. 10, 1946 2,440,786 Schade May 4, 1948 2,510,670 Trott June 6, 1950 2,520,155 Liekcns Aug. 29, 1950 2,648,027 Geohegan Aug. 4, 1953

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2882447A (en) * 1957-02-26 1959-04-14 Shuhman Abraham Anode pulser
US2938140A (en) * 1957-11-09 1960-05-24 A T & E Bridgnorth Ltd Time base circuits

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US2230819A (en) * 1938-08-23 1941-02-04 Emi Ltd Thermionic valve circuits
US2244013A (en) * 1939-02-11 1941-06-03 Bell Telephone Labor Inc Electric circuit
US2309672A (en) * 1940-03-21 1943-02-02 Rca Corp Cathode ray beam deflecting circuit
US2407898A (en) * 1942-06-08 1946-09-17 Gen Electric Cathode-ray apparatus
US2412210A (en) * 1942-03-21 1946-12-10 Bell Telephone Labor Inc Cathode-ray sweep circuit
US2440786A (en) * 1943-06-30 1948-05-04 Rca Corp Cathode-ray beam deflecting circuits
US2510670A (en) * 1949-02-10 1950-06-06 Garod Radio Corp Scan magnitude control for cathode-ray tubes
US2520155A (en) * 1945-06-08 1950-08-29 Int Standard Electric Corp Sweep circuit for cathode-ray tubes
US2648027A (en) * 1951-09-04 1953-08-04 Du Mont Allen B Lab Inc Beam-intensity controlling circuit for cathode-ray oscillograph

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2230819A (en) * 1938-08-23 1941-02-04 Emi Ltd Thermionic valve circuits
US2244013A (en) * 1939-02-11 1941-06-03 Bell Telephone Labor Inc Electric circuit
US2309672A (en) * 1940-03-21 1943-02-02 Rca Corp Cathode ray beam deflecting circuit
US2412210A (en) * 1942-03-21 1946-12-10 Bell Telephone Labor Inc Cathode-ray sweep circuit
US2407898A (en) * 1942-06-08 1946-09-17 Gen Electric Cathode-ray apparatus
US2440786A (en) * 1943-06-30 1948-05-04 Rca Corp Cathode-ray beam deflecting circuits
US2520155A (en) * 1945-06-08 1950-08-29 Int Standard Electric Corp Sweep circuit for cathode-ray tubes
US2510670A (en) * 1949-02-10 1950-06-06 Garod Radio Corp Scan magnitude control for cathode-ray tubes
US2648027A (en) * 1951-09-04 1953-08-04 Du Mont Allen B Lab Inc Beam-intensity controlling circuit for cathode-ray oscillograph

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2882447A (en) * 1957-02-26 1959-04-14 Shuhman Abraham Anode pulser
US2938140A (en) * 1957-11-09 1960-05-24 A T & E Bridgnorth Ltd Time base circuits

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