US3648098A - Oscilloscopes utilizing video signals to modulate the beam with varying deflection periods - Google Patents

Oscilloscopes utilizing video signals to modulate the beam with varying deflection periods Download PDF

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Publication number
US3648098A
US3648098A US865252A US3648098DA US3648098A US 3648098 A US3648098 A US 3648098A US 865252 A US865252 A US 865252A US 3648098D A US3648098D A US 3648098DA US 3648098 A US3648098 A US 3648098A
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United States
Prior art keywords
frequency
deflection
gating
signals
periods
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Expired - Lifetime
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US865252A
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English (en)
Inventor
David Godwin Talbert
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S E LAB HOLDINGS Ltd
Se Laboratories Holdings Ltd
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S E LAB HOLDINGS Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • G01R13/20—Cathode-ray oscilloscopes
    • G01R13/22—Circuits therefor
    • G01R13/30—Circuits for inserting reference markers, e.g. for timing, for calibrating, for frequency marking

Definitions

  • An oscilloscope which includes means for producing deflection of the beam of a cathoderay tube in one [2
  • an oscilloscope including a deflection circuit which provides a vertical deflecting waveform of high frequency and a horizontal deflecting waveform of relatively low frequency. Means are also provided for generating a sawtooth voltage, called a ramp, synchronous with the vertical deflecting waveform so that its instantaneous value corresponds to the vertical deflecting waveform and therefore corresponds to the vertical deflection of the beam on the screen. A plurality of signals to be displayed are compared with the ramp, the signals being superimposed respectively on progressively higher direct shift voltages, which are separated by amounts exceeding the maximum amplitude of the respective signal.
  • each cycle of the ramp successive coincidences occur between the ramp and the signals superimposed on the respective shift voltages and each time a coincidence occurs a bright-up signal is generated which is applied to the beam of the cathode-ray tube to produce a bright spot on the screen.
  • the vertical deflection frequency is high enough for each signal to be displayed as a substantially continuous trace.
  • the period of the horizontal deflecting waveform is sufficiently long to allow for the display of slowly varying waveforms.
  • the horizontal deflection period may be between 0.1 second and seconds to suit the rate of variation of the signals to be displayed.
  • oscilloscopes it may also be desired to display fixed information such as range markers, medical average parameters, oil pressures and the like.
  • fixed information such as range markers, medical average parameters, oil pressures and the like.
  • difficulty is encountered because the decay time of the phosphor is such that information written at the start of one horizontal deflection period has faded by the end of the period.
  • An object of the present invention is to provide an improved oscilloscope adapted for displaying slowly varying waveforms.
  • a further object of the present invention is to provide an improved oscilloscope adapted for displaying markers superimposed on slowly varying waveforms.
  • an oscilloscope including a. means for producing deflection of the beam of a cathoderay tube in a first direction at a first frequency
  • c. means for defining an interval in each second frequency deflection period, the timing of the occurrence of the interval being changed in successive second frequency deflection periods, and
  • gating means for allowing at least one signal to intensity modulate said beam only during said intervals whereby the waveform of said signal is displayed on the display of said cathode-ray tube.
  • an oscilloscope in accordance with the preceding paragraph including further gating means for gating further signals to form a marker on the display during a selected first frequency deflection period in each second frequency deflection period.
  • the oscilloscope which is illustrated includes a cathode-ray tube 1, which is shown symbolically in sectional view.
  • the tube has vertical deflecting plates 2 and horizontal deflecting plates 3.
  • plates 2 and 3 may be replaced by vertical and vertical magnetic deflection coils.
  • the horizontal deflecting plates 2 receive a sawtooth waveform of relatively high frequency from a circuit 4 and a corresponding waveform is also fed, to act as a ramp, to a series of comparison circuits two of which are denoted by the references S and 5,,
  • the comparison circuits 5, 5 receive, as second input signals, signals to be displayed superimposed on successively larger direct shift voltages.
  • Two of the circuits for superimposing a signal on a respective shift voltage are denoted by the references 6, and l5, and, in known manner, the shift voltages may be arranged to be separated by amounts exceeding the maximum amplitudes of the respective signals.
  • the horizontal deflecting waveform which is applied to the plates 3 of the cathode-ray tube is of relatively short deflection period compared with the periods proposed above, say onefiftieth of a second.
  • the horizontal deflecting sawtooth waveform is generated by a circuit 10 and this circuit is also arranged to provide a corresponding ramp voltage of 50 cycles per second to a comparison circuit 11.
  • the second input to this comparison circuit is a reference voltage derived from a circuit 12. ln this example of the invention the reference is a fixed voltage which is however capable of manual adjustment.
  • the comparison circuit 11 When the circuit 11 detects coincidences between the ramp from the circuit 10 and the reference voltage from the circuit 12 it applies an output signal to a gate 13 to open the gate from which is generated a bright-up signal as long as the signal from circuit 11 is present which is applied to the modulator of the cathode-ray tube 1.
  • the comparison circuit 11 is arranged to produce an output signal which lasts for a vertical deflection period, and to this end circuit 11 may include a monostable circuit triggered in response to the detection of a coincidence to produce a pulse of duration equal to a vertical deflection period.
  • the operation of the comparison circuit 11 and the gate 13 is to cause a substantially vertical marker line to be displayed by the cathode-ray tube at a selected horizontal position, the line being regenerated in each period of the waveform from the circuit 10. Because the period of the latter waveform is relatively short, as described above, the marker line so produced is not susceptible to fading.
  • the period of the waveform derived from the circuit 10 is however now insufficiently long for displaying the slowly moving waveforms corresponding to the video signals applied to the comparison circuits 5 5,. Therefore a further sawtooth waveform generator 14 is provided which generates a ramp voltage of relatively long period, and which is comparable with the period of the horizontal deflection waveform of prior art oscilloscopes.
  • the ramp from 14 is compared in a comparison circuit 15 with the ramp from the circuit 10, and on the assumption that the two ramps are of the same amplitude the circuit 15 will detect coincidences between the two waveforms once in every period of the ramp from circuit 10. However the coincidences will occur at successively later times in successive periods of the ramp from circuit 10.
  • the comparison circuit 15 is arranged to produce a gating waveform lasting for one vertical deflection period and thiswaveforrn is applied to the gate 9 to allow the bright-up pulses from the gates 7, 7, to be applied to the modulator electrode of the cathode ray tube 1. Therefore, the period allowedfor the formation of the slowly varying waveforms corresponding to the video signals is the period of the waveform generated by the circuit 14.
  • more than one marker may be produced at the display by providing more than one source, such as 12, of reference. Markers other than vertical lines may also be produced. Furthermore, by providing a plurality of circuits such as 14, for generating slow ramps of different periods, simultaneous waveform displays may be generated at different rates. Other modifications may also be made in the circuit display.
  • An oscilloscope including a. means for producing deflection of the beam of a cathoderay tube in a first direction at a first frequency
  • gating means for allowing at least one signal to intensity :modulate said beam only during said intervals whereby the waveform of said signal is displayed on the display of said cathode-ray tube.
  • An oscilloscope according to claim 1 including further gating means for gating further signals to form one or more markers on the display during respective selected first frequency deflection periods in each second frequency deflection period.
  • An oscilloscope according to claim 1 wherein a. said means for producing deflection at a second frequency comprises means for producing a first ramp waveform at said second frequency, and said means for defining an interval comprises b. means for producing a further ramp waveform at a substantially lower frequency than said first ramp waveform, means for detecting coincidences of said first ramp waveform with said further ramp waveform, and d. means for generating said intervals in response to said coincidences, the timing of the occurrence of a coincidence changing in successive periods of said second frequency deflection.
  • An oscilloscope according to claim 3 including further gating means for gating further signals to form one or more markers on the display during respective selected first frequency deflection periods in each second frequency deflection period.
  • An oscilloscope according to claim 4 wherein said further gating means comprises a. means for detecting coincidences between one or more reference signals and said first ramp waveform, and
  • An oscilloscope according to claim 1 including means for superimposing each of a plurality of signals to be displayed on a respective direct shift voltage, whereby the waveforms of each of said plurality of signals are displayed on said display separated in said first direction.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Details Of Television Scanning (AREA)
US865252A 1968-10-11 1969-10-10 Oscilloscopes utilizing video signals to modulate the beam with varying deflection periods Expired - Lifetime US3648098A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4837368 1968-10-11

Publications (1)

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US3648098A true US3648098A (en) 1972-03-07

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US865252A Expired - Lifetime US3648098A (en) 1968-10-11 1969-10-10 Oscilloscopes utilizing video signals to modulate the beam with varying deflection periods

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US (1) US3648098A (enrdf_load_stackoverflow)
DE (1) DE1951167A1 (enrdf_load_stackoverflow)
GB (1) GB1289963A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953764A (en) * 1971-09-29 1976-04-27 Delta-X Corporation Method and means for selectively positioning a light source for illuminating film transparencies
US4009436A (en) * 1975-12-15 1977-02-22 Pitney-Bowes, Inc. Latch strobe generator circuit

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2653391C2 (de) * 1976-11-24 1981-12-10 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung zur Abbildung elektrischer Signale bzw. Funktionen mit Hilfe eines Elektronenstrahl-Oszilloskops
DE3344518A1 (de) * 1983-12-09 1985-06-20 Robert Bosch Gmbh, 7000 Stuttgart Elektrische baugruppe
DE8903507U1 (de) * 1989-03-21 1989-07-20 Fritz Hartmann Gerätebau GmbH & Co KG, 8523 Baiersdorf Trägervorrichtung für elektrische Komponenten
DE29617021U1 (de) * 1996-09-30 1996-11-14 Hella Kg Hueck & Co, 59557 Lippstadt Leiterplatte
DE19838218A1 (de) * 1998-08-22 2000-02-24 Insta Elektro Gmbh & Co Kg Konstruktive Anordnung zweier Leiterplatten in einem elektrischen Installationsgerät zum Einbau in genormte Installationsdosen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2831146A (en) * 1955-06-30 1958-04-15 Panoramic Radio Products Inc Panoramic system
US2840756A (en) * 1954-10-30 1958-06-24 Cole E K Ltd Oscilloscopes
US2858475A (en) * 1954-02-02 1958-10-28 California Research Corp Method and apparatus for visually analyzing a plurality of signals
US3395310A (en) * 1963-05-10 1968-07-30 Philips Corp Apparatus for generating time markers on the screen of a cathode ray tube in which the horizontal speed of the beam continuously varies between a given value, and substantially zero when the marker is turned on

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2858475A (en) * 1954-02-02 1958-10-28 California Research Corp Method and apparatus for visually analyzing a plurality of signals
US2840756A (en) * 1954-10-30 1958-06-24 Cole E K Ltd Oscilloscopes
US2831146A (en) * 1955-06-30 1958-04-15 Panoramic Radio Products Inc Panoramic system
US3395310A (en) * 1963-05-10 1968-07-30 Philips Corp Apparatus for generating time markers on the screen of a cathode ray tube in which the horizontal speed of the beam continuously varies between a given value, and substantially zero when the marker is turned on

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953764A (en) * 1971-09-29 1976-04-27 Delta-X Corporation Method and means for selectively positioning a light source for illuminating film transparencies
US4009436A (en) * 1975-12-15 1977-02-22 Pitney-Bowes, Inc. Latch strobe generator circuit

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DE1951167A1 (de) 1970-04-23
GB1289963A (enrdf_load_stackoverflow) 1972-09-20

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