JPS57208473A - Measuring device for duty ratio - Google Patents

Measuring device for duty ratio

Info

Publication number
JPS57208473A
JPS57208473A JP9393581A JP9393581A JPS57208473A JP S57208473 A JPS57208473 A JP S57208473A JP 9393581 A JP9393581 A JP 9393581A JP 9393581 A JP9393581 A JP 9393581A JP S57208473 A JPS57208473 A JP S57208473A
Authority
JP
Japan
Prior art keywords
signal
duty ratio
counter
brought
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
JP9393581A
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 JP9393581A priority Critical patent/JPS57208473A/en
Publication of JPS57208473A publication Critical patent/JPS57208473A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
    • G01R29/027—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values
    • G01R29/0273—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values the pulse characteristic being duration, i.e. width (indicating that frequency of pulses is above or below a certain limit)

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 installing a microcomputer equipped with a means for computing a duty ratio based on counting of the number of the types of loops generated at an ON/OFF time. CONSTITUTION:When a program starts, an oscillating signal of a signal source 4a selected and assigned by a signal source selecting circuit 3 is inputted to a microcomputer 1. A microprocessor unit (MPU)9 determines the presence of a rise in a data. If a rise signal is produced, a counter 13 of an RAM11 counts +1, and if[a signal=0?]is brought to[NO], a first loop is repeated. If[a signal=0?] is brought to[YES], a counter 14 counts +1, and a second loop is repeated. If[a signalnot equal to 0]is brought to[YES]and a counter 16, counting -1, goes to ''0'', the MPU9 computes and determines a duty ratio from accumulating addition values M of the counters 13 and 14 by operating a Formula D=M/(M+N).
JP9393581A 1981-06-19 1981-06-19 Measuring device for duty ratio Pending JPS57208473A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9393581A JPS57208473A (en) 1981-06-19 1981-06-19 Measuring device for duty ratio

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9393581A JPS57208473A (en) 1981-06-19 1981-06-19 Measuring device for duty ratio

Publications (1)

Publication Number Publication Date
JPS57208473A true JPS57208473A (en) 1982-12-21

Family

ID=14096286

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9393581A Pending JPS57208473A (en) 1981-06-19 1981-06-19 Measuring device for duty ratio

Country Status (1)

Country Link
JP (1) JPS57208473A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011076103A1 (en) * 2009-12-22 2011-06-30 Byd Company Limited Method and device for detecting pwm wave

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011076103A1 (en) * 2009-12-22 2011-06-30 Byd Company Limited Method and device for detecting pwm wave
US8878603B2 (en) 2009-12-22 2014-11-04 Shenzhen Byd Auto R&D Company Limited Method and device for detecting PWM wave

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