GB1423228A - Numerical display integrating voltmeter measuring instruments - Google Patents

Numerical display integrating voltmeter measuring instruments

Info

Publication number
GB1423228A
GB1423228A GB1634573A GB1634573A GB1423228A GB 1423228 A GB1423228 A GB 1423228A GB 1634573 A GB1634573 A GB 1634573A GB 1634573 A GB1634573 A GB 1634573A GB 1423228 A GB1423228 A GB 1423228A
Authority
GB
United Kingdom
Prior art keywords
stage
voltage
display
april
numeral
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
GB1634573A
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.)
Valeo SE
Original Assignee
Francaise du Ferodo SA
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 Francaise du Ferodo SA filed Critical Francaise du Ferodo SA
Publication of GB1423228A publication Critical patent/GB1423228A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • 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
    • G01R23/06—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into an amplitude of current or voltage
    • G01R23/09—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into an amplitude of current or voltage using analogue integrators, e.g. capacitors establishing a mean value by balance of input signals and defined discharge signals or leakage
    • 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
    • H03M1/50—Analogue/digital converters with intermediate conversion to time interval

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

1423228 Dual ramp digital voltmeters SOC ANON FRANCAISE DU FERODO 5 April 1973 [5 April 1972] 16345/73 Heading H3H A dual ramp digital voltmeter comprises a capacitor 13 charged by a current proportional to the voltage to be measured during a first phase in which a predetermined number of pulses from an oscillator 17 are counted by a counter 18 and discharged at constant current during a second phase the duration of which is proportional to the voltage to be measured, the counter including a number of decade stages 19 and at least one additional decade stage 23, 24. The voltmeter includes a polarity detector 15, an operational amplifier 12, a comparator 14, a constant current source 22 and a circuit 16 which controls gates P1-P4 to enable a digital display of the voltage by display tubes 21. A selector switch 25 allows the stages 19 to be used above or in conjunction with the additional stage 23 or 24. The stage 23 enables the last digit to be displayed as a numeral 0 or 9 whilst the stage 24 enables the display of a numeral 0, 2, 4, 6 or 8.
GB1634573A 1972-04-05 1973-04-05 Numerical display integrating voltmeter measuring instruments Expired GB1423228A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7211856A FR2178743B1 (en) 1972-04-05 1972-04-05

Publications (1)

Publication Number Publication Date
GB1423228A true GB1423228A (en) 1976-02-04

Family

ID=9096338

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1634573A Expired GB1423228A (en) 1972-04-05 1973-04-05 Numerical display integrating voltmeter measuring instruments

Country Status (4)

Country Link
DE (1) DE2316661A1 (en)
FR (1) FR2178743B1 (en)
GB (1) GB1423228A (en)
IT (1) IT984749B (en)

Also Published As

Publication number Publication date
FR2178743B1 (en) 1976-08-06
DE2316661A1 (en) 1973-10-11
IT984749B (en) 1974-11-20
FR2178743A1 (en) 1973-11-16

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee