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GB1364909A - Apparatus for measuring electrical signals - Google Patents

Apparatus for measuring electrical signals

Info

Publication number
GB1364909A
GB1364909A GB5794271A GB5794271A GB1364909A GB 1364909 A GB1364909 A GB 1364909A GB 5794271 A GB5794271 A GB 5794271A GB 5794271 A GB5794271 A GB 5794271A GB 1364909 A GB1364909 A GB 1364909A
Authority
GB
United Kingdom
Prior art keywords
circuit
amplifier
signal
digital
linear
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
GB5794271A
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.)
Nortronic AS
Original Assignee
Nortronic AS
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 Nortronic AS filed Critical Nortronic AS
Publication of GB1364909A publication Critical patent/GB1364909A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06G7/20—Arrangements for performing computing operations, e.g. operational amplifiers for evaluating powers, roots, polynomes, mean square values, standard deviation
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06J—HYBRID COMPUTING ARRANGEMENTS
    • G06J1/00—Hybrid computing arrangements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Software Systems (AREA)
  • Automation & Control Theory (AREA)
  • Evolutionary Computation (AREA)
  • Fuzzy Systems (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

1364909 Measuring circuit NORTRONIC A/S 14 Dec 1971 [16 Dec 1970] 57942/71 Heading G4H In a circuit for measuring an A.C. or D.C. signal, the signal is fed to a variable gain amplifier 21 whose output passes through a function circuit 22 to be compared with a D.C. reference level 1, and the difference is smoothed in a filter halved and fed back via an A/DL converter 24 and exponential circuit 23 to control the gain of the amplifier 21. In Fig. 2, the input is an A.C. signal and circuit 22 a squaring circuit to give an R.M.S. output in analogue logarithmic form, digital logarithmic form and digital linear form from the respective outputs marked ANALOGDIGITAL and LINEAR DIGITAL. Circuit 22 can instead be a rectifying circuit to give an average value of A.C. or a simple transfer circuit of the input is D.C. The non-linear circuit 23 can be placed before the A/D converter or alternatively incorporated into the gain control of the amplifier 21. The amplifier consists of a chain of operational amplifiers whose amplification is controlled by switching field effect transistors. Reference has been directed by the Comptroller to Specification 1,241,418.
GB5794271A 1970-12-16 1971-12-14 Apparatus for measuring electrical signals Expired GB1364909A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO483470A NO125362B (en) 1970-12-16 1970-12-16

Publications (1)

Publication Number Publication Date
GB1364909A true GB1364909A (en) 1974-08-29

Family

ID=19880646

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5794271A Expired GB1364909A (en) 1970-12-16 1971-12-14 Apparatus for measuring electrical signals

Country Status (4)

Country Link
DE (1) DE2162337A1 (en)
DK (1) DK143372C (en)
GB (1) GB1364909A (en)
NO (1) NO125362B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132841A (en) * 1982-12-24 1984-07-11 Krautkraemer Gmbh Method and apparatus for the digitalization and storage of ultrasonic information

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3511593A1 (en) * 1985-03-27 1986-10-02 CREATEC Gesellschaft für Elektrotechnik mbH, 1000 Berlin Signal-processing apparatus having a level-matching circuit which can be switched over
US4897599A (en) * 1985-03-27 1990-01-30 Createc Gesellschaft Fur Elektrotechnik Mbh Signal processing device with a level adapter circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132841A (en) * 1982-12-24 1984-07-11 Krautkraemer Gmbh Method and apparatus for the digitalization and storage of ultrasonic information

Also Published As

Publication number Publication date
DE2162337A1 (en) 1972-06-22
DK143372B (en) 1981-08-10
NO125362B (en) 1972-08-28
DK143372C (en) 1981-12-14

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Legal Events

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