GB1190996A - Bridge Circuit - Google Patents

Bridge Circuit

Info

Publication number
GB1190996A
GB1190996A GB3148267A GB3148267A GB1190996A GB 1190996 A GB1190996 A GB 1190996A GB 3148267 A GB3148267 A GB 3148267A GB 3148267 A GB3148267 A GB 3148267A GB 1190996 A GB1190996 A GB 1190996A
Authority
GB
United Kingdom
Prior art keywords
ref
bridge
feedback amplifier
output
july
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
GB3148267A
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.)
Sippican Corp
Original Assignee
Sippican Corp
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 US564075A external-priority patent/US3341757A/en
Application filed by Sippican Corp filed Critical Sippican Corp
Publication of GB1190996A publication Critical patent/GB1190996A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
    • G01R17/10—AC or DC measuring bridges
    • G01R17/105—AC or DC measuring bridges for measuring impedance or resistance

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

1,190,996. Measuring bridge circuits. SIPPICAN CORP. July 7, 1967 [July 11, 1966], No.31482/67. Heading G1U. A bridge circuit is such that when balanced, i.e. providing zero output, the current flow through it is inversely proportional to the resistance R I , e.g. that of a thermistor, being measured. The bridge supply current I is derived from the output of a differential feedback amplifier A whose input is supplied from the bridge output terminals. A reference voltage source E REF is connected in the bridge arm containing R X , in a direction opposing the voltage drop across R X due to the supply current. At the balance achieved by the operation of the feedback amplifier, <SP>1</SP>/ RX = <SP>I</SP>/2E REF , of the feedback amplifier, <SP>1</SP>/ RX = <SP>I</SP>/2E REF , so long as the reference arms R 1 , R 2 are equal <SP>I</SP>/ 2 flows through each bridge branch. A value proportional to <SP>I</SP>/ E REF is automatically determined by a separate servo-system driving the contact of potentiometer P1 to a position r such that the input to the servo amplifier, <SP>1</SP>/ 2 IR 2 - rE REF is zero, i. e. r = R2/2 I/E REF .
GB3148267A 1966-07-11 1967-07-07 Bridge Circuit Expired GB1190996A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US564075A US3341757A (en) 1966-07-11 1966-07-11 Bridge circuit for determining the inverse of resistance

Publications (1)

Publication Number Publication Date
GB1190996A true GB1190996A (en) 1970-05-06

Family

ID=24253063

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3148267A Expired GB1190996A (en) 1966-07-11 1967-07-07 Bridge Circuit

Country Status (2)

Country Link
DE (1) DE1616049B2 (en)
GB (1) GB1190996A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5940623A (en) 1997-08-01 1999-08-17 Cummins-Allison Corp. Software loading system for a coin wrapper

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5940623A (en) 1997-08-01 1999-08-17 Cummins-Allison Corp. Software loading system for a coin wrapper

Also Published As

Publication number Publication date
DE1616049A1 (en) 1970-02-12
DE1616049B2 (en) 1971-11-25

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years