FR2424538A1 - Wattmeter and/or voltmeter with numerical indicator - requires instrument which includes processing circuit to give reading in decibels - Google Patents

Wattmeter and/or voltmeter with numerical indicator - requires instrument which includes processing circuit to give reading in decibels

Info

Publication number
FR2424538A1
FR2424538A1 FR7812612A FR7812612A FR2424538A1 FR 2424538 A1 FR2424538 A1 FR 2424538A1 FR 7812612 A FR7812612 A FR 7812612A FR 7812612 A FR7812612 A FR 7812612A FR 2424538 A1 FR2424538 A1 FR 2424538A1
Authority
FR
France
Prior art keywords
decibels
processing circuit
wattmeter
voltmeter
indication
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.)
Withdrawn
Application number
FR7812612A
Other languages
French (fr)
Inventor
Philippe Jean Paul Marie Gouze
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Priority to FR7812612A priority Critical patent/FR2424538A1/en
Publication of FR2424538A1 publication Critical patent/FR2424538A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/005—Circuits for altering the indicating characteristic, e.g. making it non-linear

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

The measuring instrument for electrical parameters such as volts or watts has a numerical indication of value. A processing circuit permits an indication of this value in decibels. An input voltage is applied to an operational amplifier whose output is switched via parallel resistor and capacitor circuit to a second amplifier. This circuit produces logarithmic scaling to provide output indication in decibels. A third amplifier compares its input against reference voltage and its output is applied to a bistable. An oscillator drives a counter chain providing an input to the bistable and also inputs to the display elements.
FR7812612A 1978-04-28 1978-04-28 Wattmeter and/or voltmeter with numerical indicator - requires instrument which includes processing circuit to give reading in decibels Withdrawn FR2424538A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7812612A FR2424538A1 (en) 1978-04-28 1978-04-28 Wattmeter and/or voltmeter with numerical indicator - requires instrument which includes processing circuit to give reading in decibels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7812612A FR2424538A1 (en) 1978-04-28 1978-04-28 Wattmeter and/or voltmeter with numerical indicator - requires instrument which includes processing circuit to give reading in decibels

Publications (1)

Publication Number Publication Date
FR2424538A1 true FR2424538A1 (en) 1979-11-23

Family

ID=9207704

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7812612A Withdrawn FR2424538A1 (en) 1978-04-28 1978-04-28 Wattmeter and/or voltmeter with numerical indicator - requires instrument which includes processing circuit to give reading in decibels

Country Status (1)

Country Link
FR (1) FR2424538A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE700809C (en) * 1936-02-16 1940-12-31 Siemens & Halske Akt Ges Procedure for the logarithmic display of alternating voltages
FR1020813A (en) * 1950-03-17 1953-02-11 Thomson Houston Comp Francaise Radio network with exponential characteristic
US3811088A (en) * 1972-10-19 1974-05-14 Hekimian Laboratories Inc Logarithmic converter
CH572219A5 (en) * 1974-09-06 1976-01-30 Studer Willi Fa Measurement and indication of electrical signal - has logarithmic dependence for large dynamic range

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE700809C (en) * 1936-02-16 1940-12-31 Siemens & Halske Akt Ges Procedure for the logarithmic display of alternating voltages
FR1020813A (en) * 1950-03-17 1953-02-11 Thomson Houston Comp Francaise Radio network with exponential characteristic
US3811088A (en) * 1972-10-19 1974-05-14 Hekimian Laboratories Inc Logarithmic converter
CH572219A5 (en) * 1974-09-06 1976-01-30 Studer Willi Fa Measurement and indication of electrical signal - has logarithmic dependence for large dynamic range

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Legal Events

Date Code Title Description
ST Notification of lapse