GB1262671A - Sweep oscillator - Google Patents

Sweep oscillator

Info

Publication number
GB1262671A
GB1262671A GB09378/69A GB1937869A GB1262671A GB 1262671 A GB1262671 A GB 1262671A GB 09378/69 A GB09378/69 A GB 09378/69A GB 1937869 A GB1937869 A GB 1937869A GB 1262671 A GB1262671 A GB 1262671A
Authority
GB
United Kingdom
Prior art keywords
gate
pulse
output
generator
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB09378/69A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Iwatsu Electric Co Ltd
Original Assignee
Iwatsu Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Iwatsu Electric Co Ltd filed Critical Iwatsu Electric Co Ltd
Publication of GB1262671A publication Critical patent/GB1262671A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00Arrangements for displaying electric variables or waveforms
    • G01R13/20Cathode-ray oscilloscopes
    • G01R13/22Circuits therefor
    • G01R13/24Time-base deflection circuits
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K4/00Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Manipulation Of Pulses (AREA)
  • Details Of Television Scanning (AREA)

Abstract

1,262,671. Sweep generator; automatic frequency control. IWASAKI TSUSHINKI K.K. 16 April, 1969 [18 April, 1968; 14 Feb., 1969], No. 19378/69. Headings H3A and H3P. A generator 4, Fig. 2, whose output sawtooth w 3 duration is controlled by a gate 2 opened by an input signal pulse w 1 (Fig. 8) at 1 and closed by a hold circuit 21 responsive to a predetermined amplitude of the sawtooth, is capable of producing a plurality of predetermined slopes (having, therefore, correspondingly different frequencies), and successively increasing slopes are automatically selected by a circuit (e.g. 6, 7, 8, 9, 10) whenever an input pulse w 1 is detected during a predetermined interval w 4 from the start of the sawtooth, the selection being stopped at that slope for which no such input pulse is detected; and the generator is reset to give the lowest value of slope when less than a given number of input signal pulses w 2 is received during a second predetermined period w 5 longer than the first. The second period w 5 may begin at the start or the end of the first pulse w 4 . In the automatic selection circuit 6, 7, 8, 9, 10, a gate 6 generates the pulse w 4 by being first set by an input pulse w 1 and then reset by a predetermined level A of the sawtooth w 3 . An AND gate 8 is enabled by w 4 and passes an input pulse w 1 , if such occurs during w 4 , to a monostable 9 and counter 10. The count reached by the counter sets the slope of the generator 4 output, such that no input pulse w 1 occurs during w 4 (which is now narrower). The gate 12 is set to produce the leading edge of pulse w 5 by the end of pulse w 4 from gate 6, or alternatively (Figs. 4, 10, not shown) by the start of sweep gate 2 output pulse w 2 . The gate 12 then enables a a gate 13 to pass input signal pulses w 1 to a divider 14. When the given number of pulses N (say 3) has been counted (w 6 ) the divider output w 7 changes and inhibits a gate 16. The other input to gate 17 is from a comparator 19 sensing when the sawtooth w 3 has reached a selected level C and thereupon producing a pulse w 8 . This pulse w 8 is only passed by gate 16 when the number of pulses w 6 in the period w 5 is less than N (representing a drop in input signal frequency w 1 ) so that the divider 14 produces no inhibiting output w 7 . The output of gate 16 triggers a monostable 17 which acts on monostable 9 and counter 10 to cause the generator 4 to reset to its lowest slope. From this slope, the generator is then again switched up through successively increasing slopes until one appropriate to the new input signal frequency is reached. In modifications, the comparator 19 is replaced by a differentiator (19, Figs. 3, 5, 7, not shown) receiving the sweep gate output w 2 , and a delay (20) then has to be provided between divider (14) and gate (16) to ensure that w 8 is not accidentally passed if intended to be inhibited. The gate 12 may be replaced by a bi-stable (12). In a more detailed embodiment including the above features (Fig. 14, not shown), the divider 14 includes a counter (14-1), a pulse converter (14-2) and a bi-stable (14-3); and the counter 10 includes a ring counter (10-1) and a bistable (10-2). The input signal passes through a shaper and a differentiator to the sweep gate. The monostable 17 for initiating reset of the generator 4 to its lowest slope output is provided with a manual input.
GB09378/69A 1968-04-18 1969-04-16 Sweep oscillator Expired GB1262671A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2550068 1968-04-18
JP1091569 1969-02-14

Publications (1)

Publication Number Publication Date
GB1262671A true GB1262671A (en) 1972-02-02

Family

ID=26346281

Family Applications (1)

Application Number Title Priority Date Filing Date
GB09378/69A Expired GB1262671A (en) 1968-04-18 1969-04-16 Sweep oscillator

Country Status (4)

Country Link
US (1) US3571755A (en)
DE (1) DE1919862B2 (en)
GB (1) GB1262671A (en)
NL (1) NL6906070A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2134732A (en) * 1983-02-07 1984-08-15 Tektronix Inc Automatically calibrating sweep waveforms

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2223672C2 (en) * 1972-05-16 1974-03-14 Hewlett-Packard Gmbh, 7030 Boeblingen Trigger circuit, especially for oscilloscopes
EP0099415A1 (en) * 1982-07-17 1984-02-01 KRAUTKRÄMER GmbH & Co. Circuit for generating sawtooth pulses and its application to ultrasonic measuring apparatuses
US4771193A (en) * 1985-12-27 1988-09-13 Matsushita Electric Industrial Co., Ltd. Synchronizing circuit
NL8800697A (en) * 1988-03-21 1989-10-16 Philips Nv TRACTOR SYSTEM AND OSCILLOSCOPE FITTED WITH A TRACTOR SYSTEM.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3493961A (en) * 1966-05-27 1970-02-03 Rca Corp Circuit for selectively altering the slope of recurring ramp signals

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2134732A (en) * 1983-02-07 1984-08-15 Tektronix Inc Automatically calibrating sweep waveforms

Also Published As

Publication number Publication date
NL6906070A (en) 1969-10-21
DE1919862B2 (en) 1972-02-17
DE1919862A1 (en) 1969-11-20
US3571755A (en) 1971-03-23

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