FR1401891A - Improvements to micro-microammeters - Google Patents

Improvements to micro-microammeters

Info

Publication number
FR1401891A
FR1401891A FR982569A FR982569A FR1401891A FR 1401891 A FR1401891 A FR 1401891A FR 982569 A FR982569 A FR 982569A FR 982569 A FR982569 A FR 982569A FR 1401891 A FR1401891 A FR 1401891A
Authority
FR
France
Prior art keywords
microammeters
micro
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
FR982569A
Other languages
French (fr)
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston 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
Priority claimed from US297027A external-priority patent/US3320532A/en
Application filed by Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Priority to FR982569A priority Critical patent/FR1401891A/en
Application granted granted Critical
Publication of FR1401891A publication Critical patent/FR1401891A/en
Expired 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
    • G01R19/0023—Measuring currents or voltages from sources with high internal resistance by means of measuring circuits with high input impedance, e.g. OP-amplifiers
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
    • G06G7/24—Arrangements for performing computing operations, e.g. operational amplifiers for evaluating logarithmic or exponential functions, e.g. hyperbolic functions
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/34—DC amplifiers in which all stages are DC-coupled
    • H03F3/343—DC amplifiers in which all stages are DC-coupled with semiconductor devices only
    • H03F3/345—DC amplifiers in which all stages are DC-coupled with semiconductor devices only with field-effect devices
    • H03F3/3455—DC amplifiers in which all stages are DC-coupled with semiconductor devices only with field-effect devices with junction-FET's

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Software Systems (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Nonlinear Science (AREA)
FR982569A 1963-07-23 1964-07-22 Improvements to micro-microammeters Expired FR1401891A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR982569A FR1401891A (en) 1963-07-23 1964-07-22 Improvements to micro-microammeters

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US297027A US3320532A (en) 1963-07-23 1963-07-23 Logarithmic micro-microammeter having field effect transistor in feedback path
FR982569A FR1401891A (en) 1963-07-23 1964-07-22 Improvements to micro-microammeters

Publications (1)

Publication Number Publication Date
FR1401891A true FR1401891A (en) 1965-06-04

Family

ID=26209002

Family Applications (1)

Application Number Title Priority Date Filing Date
FR982569A Expired FR1401891A (en) 1963-07-23 1964-07-22 Improvements to micro-microammeters

Country Status (1)

Country Link
FR (1) FR1401891A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1591869B1 (en) * 1966-11-07 1970-12-23 Commissariat Energie Atomique Arrangement for the simultaneous measurement of direct currents on a linear and logarithmic scale

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1591869B1 (en) * 1966-11-07 1970-12-23 Commissariat Energie Atomique Arrangement for the simultaneous measurement of direct currents on a linear and logarithmic scale

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