JPS5716366A - Frequency abnormality detector - Google Patents

Frequency abnormality detector

Info

Publication number
JPS5716366A
JPS5716366A JP9197680A JP9197680A JPS5716366A JP S5716366 A JPS5716366 A JP S5716366A JP 9197680 A JP9197680 A JP 9197680A JP 9197680 A JP9197680 A JP 9197680A JP S5716366 A JPS5716366 A JP S5716366A
Authority
JP
Japan
Prior art keywords
frequency
output
trigger output
window
counter
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.)
Granted
Application number
JP9197680A
Other languages
Japanese (ja)
Other versions
JPS6025746B2 (en
Inventor
Hiroshi Okano
Taiji Hara
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP9197680A priority Critical patent/JPS6025746B2/en
Publication of JPS5716366A publication Critical patent/JPS5716366A/en
Publication of JPS6025746B2 publication Critical patent/JPS6025746B2/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

PURPOSE:To simplify detection of abnormality of frequency by detecting existence of a trigger output of a beat frequency counter in the range of window signals obtained from a standard frequency signal. CONSTITUTION:A frequency counter 4 generates a trigger output when it counts a1 times of standard frequency number fo, and a window generation circuit 5 generates window signals of the range from trigger output time of the counter 4 to a2 times of standard frequency input. On the other hand, a beat frequency counter 6 generates a trigger output when it counted standard frequency fo and b times of the output of the digital mixer 3, to which frequency f to be measured is inputted. This trigger output and window output are compared by a flip-flop circuit 7, and a warning signal as abnormal signal will be issued from the output terminal 8 when the trigger output falls outside of the window signal. This enalbes to detect the abnormality of any frequency by application of generally-used standard frequency.
JP9197680A 1980-07-02 1980-07-02 Frequency anomaly detector Expired JPS6025746B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9197680A JPS6025746B2 (en) 1980-07-02 1980-07-02 Frequency anomaly detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9197680A JPS6025746B2 (en) 1980-07-02 1980-07-02 Frequency anomaly detector

Publications (2)

Publication Number Publication Date
JPS5716366A true JPS5716366A (en) 1982-01-27
JPS6025746B2 JPS6025746B2 (en) 1985-06-20

Family

ID=14041536

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9197680A Expired JPS6025746B2 (en) 1980-07-02 1980-07-02 Frequency anomaly detector

Country Status (1)

Country Link
JP (1) JPS6025746B2 (en)

Also Published As

Publication number Publication date
JPS6025746B2 (en) 1985-06-20

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