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JPS57208470A - Measuring device for frequency - Google Patents

Measuring device for frequency

Info

Publication number
JPS57208470A
JPS57208470A JP9393281A JP9393281A JPS57208470A JP S57208470 A JPS57208470 A JP S57208470A JP 9393281 A JP9393281 A JP 9393281A JP 9393281 A JP9393281 A JP 9393281A JP S57208470 A JPS57208470 A JP S57208470A
Authority
JP
Japan
Prior art keywords
counter
signal
signal source
frequency
microcomputer
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.)
Pending
Application number
JP9393281A
Other languages
Japanese (ja)
Inventor
Kazuo Yoshimura
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.)
Fujitsu General Ltd
Aerojet Rocketdyne Holdings Inc
Original Assignee
Fujitsu General Ltd
Gencorp Inc
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 Fujitsu General Ltd, Gencorp Inc filed Critical Fujitsu General Ltd
Priority to JP9393281A priority Critical patent/JPS57208470A/en
Publication of JPS57208470A publication Critical patent/JPS57208470A/en
Pending 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 an interface circuit between a signal source and a microcomputer, by measuring a frequency by means of a microcomputer without the use of a counter, a timer circuit and the like. CONSTITUTION:When a program starts, in a counter 14 of an RAM11, the number of repetitions of a loop, which produces a set time, is set. A signal selecting code is then outputted from an interface circuit 12, and an oscillating signal from a signal source 4a selected and assigned by a signal source selecting circuit 3 is inputted to a microcomputer 1. A microporcessor (MPU)9 determines the presence of a rise in data, and if a rise signal is produced, a counter 13 of the RAM11 counts +1. If the counter 14, counting -1 at each determining loop, is brought to ''0'', the MPU9 computes and determines a frequency F of the signal source 4a, based on a number N counted by the counter 13 and a measuring time T asigned by the counter 14, by operating a Formula F=N/T.
JP9393281A 1981-06-19 1981-06-19 Measuring device for frequency Pending JPS57208470A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9393281A JPS57208470A (en) 1981-06-19 1981-06-19 Measuring device for frequency

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9393281A JPS57208470A (en) 1981-06-19 1981-06-19 Measuring device for frequency

Publications (1)

Publication Number Publication Date
JPS57208470A true JPS57208470A (en) 1982-12-21

Family

ID=14096202

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9393281A Pending JPS57208470A (en) 1981-06-19 1981-06-19 Measuring device for frequency

Country Status (1)

Country Link
JP (1) JPS57208470A (en)

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