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GB1409001A - Frequency meter - Google Patents

Frequency meter

Info

Publication number
GB1409001A
GB1409001A GB1387973A GB1387973A GB1409001A GB 1409001 A GB1409001 A GB 1409001A GB 1387973 A GB1387973 A GB 1387973A GB 1387973 A GB1387973 A GB 1387973A GB 1409001 A GB1409001 A GB 1409001A
Authority
GB
United Kingdom
Prior art keywords
frequency
amplifier
counter
output
march
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
GB1387973A
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.)
British Aircraft Corp Ltd
Original Assignee
British Aircraft Corp 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 British Aircraft Corp Ltd filed Critical British Aircraft Corp Ltd
Priority to GB1387973A priority Critical patent/GB1409001A/en
Publication of GB1409001A publication Critical patent/GB1409001A/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)

Abstract

1409001 Frequency measuring -BRITISH AIRCRAFT CORP Ltd 14 March 1974 [22 March 1973] 13879/73 Headings H3A and H3H A frequency measuring circuit comprises means for measuring the periodicity of an incoming signal and an amplifier 28 having a feedback circuit 30 whose effective resistance is varied in dependence on the measured periodicity such that the amplifier output is proportional to the frequency of the incoming signal. The input signal is converted to a square waveform by shaper 10 and divided-by-two in divider 12 to produce a control signal which opens gate 14 for alternate cycles of the input signal. When gate 14 is open, high frequency pulses from an oscillator 16 are counted by counter 18. After a delay produced by monostables 20, 22 the value attained by counter 18 during one cycle of the input is transferred to a store 24, and after a further delay counter 18 is cleared by the output from monostable 24. The store 24 actuates switches 26 which connect predetermined resistors 30 into the feedback path of amplifier 28, such that the resulting output is proportional to frequency.
GB1387973A 1973-03-22 1973-03-22 Frequency meter Expired GB1409001A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1387973A GB1409001A (en) 1973-03-22 1973-03-22 Frequency meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1387973A GB1409001A (en) 1973-03-22 1973-03-22 Frequency meter

Publications (1)

Publication Number Publication Date
GB1409001A true GB1409001A (en) 1975-10-08

Family

ID=10031025

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1387973A Expired GB1409001A (en) 1973-03-22 1973-03-22 Frequency meter

Country Status (1)

Country Link
GB (1) GB1409001A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2556526A1 (en) * 1983-12-09 1985-06-14 Plessey Overseas RADIO SIGNAL DETECTOR MODULES IN FREQUENCY
GB2151094A (en) * 1983-12-09 1985-07-10 Plessey Co Plc Frequency modulation detectors
GB2196497A (en) * 1986-10-15 1988-04-27 Telemus Electronic Systems Inc Apparatus for measuring the frequency of microwave signals

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2556526A1 (en) * 1983-12-09 1985-06-14 Plessey Overseas RADIO SIGNAL DETECTOR MODULES IN FREQUENCY
GB2151094A (en) * 1983-12-09 1985-07-10 Plessey Co Plc Frequency modulation detectors
US4603302A (en) * 1983-12-09 1986-07-29 Plessey Overseas Limited Frequency modulation detectors
GB2196497A (en) * 1986-10-15 1988-04-27 Telemus Electronic Systems Inc Apparatus for measuring the frequency of microwave signals
GB2196497B (en) * 1986-10-15 1991-01-23 Telemus Electronic Systems Inc Apparatus for measuring the frequency of microwave signals

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee