GB770035A - Improvements in or relating to apparatus for the evaluation of low frequencies - Google Patents

Improvements in or relating to apparatus for the evaluation of low frequencies

Info

Publication number
GB770035A
GB770035A GB1030256A GB1030256A GB770035A GB 770035 A GB770035 A GB 770035A GB 1030256 A GB1030256 A GB 1030256A GB 1030256 A GB1030256 A GB 1030256A GB 770035 A GB770035 A GB 770035A
Authority
GB
United Kingdom
Prior art keywords
dividing
counter
phenomenon
period
frequency
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
GB1030256A
Inventor
George Stanley Elphick
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.)
Cinema Television Ltd
Original Assignee
Cinema Television 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 Cinema Television Ltd filed Critical Cinema Television Ltd
Priority to GB1030256A priority Critical patent/GB770035A/en
Publication of GB770035A publication Critical patent/GB770035A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G01R23/10—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into a train of pulses, which are then counted, i.e. converting the signal into a square wave
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F10/00—Apparatus for measuring unknown time intervals by electric means
    • G04F10/04—Apparatus for measuring unknown time intervals by electric means by counting pulses or half-cycles of an ac

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)

Abstract

770,035. Frequency measurement. CINEMATELEVISION, Ltd. Jan. 11, 1955 [Jan. 13, 1954], No. 10302/56. Divided out of 770,034, [Group XIX]. Class 37. Apparatus for determining the frequency of a periodic phenomenon of very low frequency comprises means responsive to the phenomenon for allowing electrical signals of a known repetition rate to pass to a counter for a period equal to one cycle of the phenomenon, and electrical means for dividing the number registered by the counter at the end of the period into unity. A shaper circuit 7 develops a pulse of duration equal to one cycle of the signal entered at terminal 6 and opens a gate 8 for this period to allow clock pulses from a source 9 to pass to a counter 10. The required frequency is given by the reciprocal of this number which is obtained by dividing it into unity. The dividing means which, preferably. comprises multicathode counting tubes, is described in Specification 770,034, [Group XIX]. Transfer of the number to the dividing means 1 ... 5 may be performed by uniselector switches or coincidence circuits.
GB1030256A 1954-01-13 1954-01-13 Improvements in or relating to apparatus for the evaluation of low frequencies Expired GB770035A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1030256A GB770035A (en) 1954-01-13 1954-01-13 Improvements in or relating to apparatus for the evaluation of low frequencies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1030256A GB770035A (en) 1954-01-13 1954-01-13 Improvements in or relating to apparatus for the evaluation of low frequencies

Publications (1)

Publication Number Publication Date
GB770035A true GB770035A (en) 1957-03-13

Family

ID=9965360

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1030256A Expired GB770035A (en) 1954-01-13 1954-01-13 Improvements in or relating to apparatus for the evaluation of low frequencies

Country Status (1)

Country Link
GB (1) GB770035A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2986699A (en) * 1958-10-27 1961-05-30 Itt Prf counter
US3079554A (en) * 1959-11-17 1963-02-26 Singer Mfg Co Mark generator
FR2210048A1 (en) * 1972-12-11 1974-07-05 Ford France
DE3108848A1 (en) * 1980-03-10 1982-01-14 Imed Corp., 92131 San Diego, Calif. DROP METER

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2986699A (en) * 1958-10-27 1961-05-30 Itt Prf counter
US3079554A (en) * 1959-11-17 1963-02-26 Singer Mfg Co Mark generator
FR2210048A1 (en) * 1972-12-11 1974-07-05 Ford France
DE3108848A1 (en) * 1980-03-10 1982-01-14 Imed Corp., 92131 San Diego, Calif. DROP METER

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