JPS5749866A - Analog-digital converter and digital voltmeter - Google Patents

Analog-digital converter and digital voltmeter

Info

Publication number
JPS5749866A
JPS5749866A JP55125009A JP12500980A JPS5749866A JP S5749866 A JPS5749866 A JP S5749866A JP 55125009 A JP55125009 A JP 55125009A JP 12500980 A JP12500980 A JP 12500980A JP S5749866 A JPS5749866 A JP S5749866A
Authority
JP
Japan
Prior art keywords
output
modulation signal
digital
comparator
rises
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
JP55125009A
Other languages
Japanese (ja)
Other versions
JPH0365513B2 (en
Inventor
Yoshio Oguma
Toshiaki Tsukada
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.)
Yokogawa Electric Corp
Original Assignee
Yokogawa Electric Corp
Yokogawa Hokushin Electric Corp
Yokogawa Electric Works 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 Yokogawa Electric Corp, Yokogawa Hokushin Electric Corp, Yokogawa Electric Works Ltd filed Critical Yokogawa Electric Corp
Priority to JP55125009A priority Critical patent/JPS5749866A/en
Priority to KR1019810000809A priority patent/KR830005771A/en
Publication of JPS5749866A publication Critical patent/JPS5749866A/en
Publication of JPH0365513B2 publication Critical patent/JPH0365513B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/255—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques using analogue/digital converters of the type with counting of pulses during a period of time proportional to voltage or current, delivered by a pulse generator with fixed frequency
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/145—Indicating the presence of current or voltage
    • G01R19/155—Indicating the presence of voltage
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Analogue/Digital Conversion (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

PURPOSE:To improve a resolution and to improve a responsiveness, by a method wherein a pulse width modulation output is synchronized with a counting clock. CONSTITUTION:If a modulation signal F1 from a frequency divider 5 rises from -Ec to +Ec, an output P2 of an integrator falls from a positive to a negative, and if it cuts a zero level, an output P3 of a comparator 2 rises from 0 to 1. A F/F circuit 10 latches the output condition of the comparator 2 resulting from the rising of an output P4 of a clock pulse generator 4. If the modulation signal voltage P1 inverts from +Ec to -Ec, the output of the integrator starts to rise. A Q-output P5 of the F/F circuit 10 counts a pulse passing a gate 6 for a period of 1, and this can determine an input voltage Ex. This enables removal of the integration of 1 count error, and permits shortening of a period of a one-time modulation signal in comparison with that of a conventional one.
JP55125009A 1980-09-09 1980-09-09 Analog-digital converter and digital voltmeter Granted JPS5749866A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP55125009A JPS5749866A (en) 1980-09-09 1980-09-09 Analog-digital converter and digital voltmeter
KR1019810000809A KR830005771A (en) 1980-09-09 1981-03-12 Analog digital potentiometer and digital voltmeter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55125009A JPS5749866A (en) 1980-09-09 1980-09-09 Analog-digital converter and digital voltmeter

Publications (2)

Publication Number Publication Date
JPS5749866A true JPS5749866A (en) 1982-03-24
JPH0365513B2 JPH0365513B2 (en) 1991-10-14

Family

ID=14899600

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55125009A Granted JPS5749866A (en) 1980-09-09 1980-09-09 Analog-digital converter and digital voltmeter

Country Status (2)

Country Link
JP (1) JPS5749866A (en)
KR (1) KR830005771A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5986331A (en) * 1982-11-08 1984-05-18 Yokogawa Hokushin Electric Corp Analog-digital converter
JPS6058721A (en) * 1983-09-09 1985-04-04 Toshiba Corp Ad converting circuit
JPH01183918A (en) * 1988-01-19 1989-07-21 Yokogawa Electric Corp Feedback pulse width modulating system a/d converting method
JPH0295018A (en) * 1988-09-30 1990-04-05 Yokogawa Electric Corp Feedback type pulse width modulating system a/d converter
JPH0360525A (en) * 1989-07-28 1991-03-15 Yokogawa Electric Corp Pwm system a/d converter
JP2007036721A (en) * 2005-07-27 2007-02-08 Tanita Corp Feedback pulse width modulation ad converter
JP2011033441A (en) * 2009-07-31 2011-02-17 Nec Corp Power supply noise measuring circuit and power supply noise measuring method
JP2016054445A (en) * 2014-09-04 2016-04-14 横河電機株式会社 Feedback pulse width modulator

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5986331A (en) * 1982-11-08 1984-05-18 Yokogawa Hokushin Electric Corp Analog-digital converter
JPS6058721A (en) * 1983-09-09 1985-04-04 Toshiba Corp Ad converting circuit
JPS6354250B2 (en) * 1983-09-09 1988-10-27 Tokyo Shibaura Electric Co
JPH01183918A (en) * 1988-01-19 1989-07-21 Yokogawa Electric Corp Feedback pulse width modulating system a/d converting method
JPH0295018A (en) * 1988-09-30 1990-04-05 Yokogawa Electric Corp Feedback type pulse width modulating system a/d converter
JPH0360525A (en) * 1989-07-28 1991-03-15 Yokogawa Electric Corp Pwm system a/d converter
JP2007036721A (en) * 2005-07-27 2007-02-08 Tanita Corp Feedback pulse width modulation ad converter
JP4526030B2 (en) * 2005-07-27 2010-08-18 株式会社タニタ Feedback type pulse width modulation AD converter
JP2011033441A (en) * 2009-07-31 2011-02-17 Nec Corp Power supply noise measuring circuit and power supply noise measuring method
US8531190B2 (en) 2009-07-31 2013-09-10 Nec Corporation Power supply noise measuring circuit and power supply noise measuring method
JP2016054445A (en) * 2014-09-04 2016-04-14 横河電機株式会社 Feedback pulse width modulator

Also Published As

Publication number Publication date
JPH0365513B2 (en) 1991-10-14
KR830005771A (en) 1983-09-09

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