GB630638A - Electrical measuring apparatus - Google Patents

Electrical measuring apparatus

Info

Publication number
GB630638A
GB630638A GB15263/47A GB1526347A GB630638A GB 630638 A GB630638 A GB 630638A GB 15263/47 A GB15263/47 A GB 15263/47A GB 1526347 A GB1526347 A GB 1526347A GB 630638 A GB630638 A GB 630638A
Authority
GB
United Kingdom
Prior art keywords
impedance
resistance
source
impedances
balance
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
GB15263/47A
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.)
Schneider Electric Systems USA Inc
Original Assignee
Foxboro Co
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 Foxboro Co filed Critical Foxboro Co
Publication of GB630638A publication Critical patent/GB630638A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
    • G01K7/20—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit
    • 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
    • G01R17/02—Arrangements in which the value to be measured is automatically compared with a reference value

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

630,638. Impedance measurements. FOXBORO CO. June 10, 1947, No. 15263. Convention date, June 12, 1946. [Class 37] [Also in Group XXXVIII] A circuit for measuring impedance, e.g. the resistance of a temperature, conductivity, pressure, humidity or strain-sensitive element, comprises (1) a first potentiometer consisting of impedances 66, D, 64 across a source 14, impedance D being shunted by a variable impedance 40 in series with an impedance 76, and (2) a second potentiometer consisting of impedances 52, S, 50 across a source, impedance S being shunted by impedance A, the condition responsive or unknown impedance 57 and impedance C, the potentials at Y, W, being compared in a null indicator 30 and impedance 40 being adjusted to secure balance. Preferably any out-of-balance current actuates a motor 36 which controls recorder 42 and adjusts impedance 40 to produce balance. As shown, both potentiometers are supplied from the same source so that they form a bridge. Impedances D, S are selected from D1 ... D4, S1 ... S4 to provide four ranges within which impedance 57 may lay. Each resistance A is equal to the sum of the corresponding resistance C and the value of the resistance 57 at the mid-point of the corresponding range ; the resistances A, C preferably have a low temperature co-efficient, and the arrangement is such as to compensate for the non-linearity of the variation of resistance 57 with temperature. As shown, the source 14 is an A.C. source, and the phase of the potential at W and Y is compared in indicator 30 to actuate motor 36 to reduce the phase difference to zero. Adjustment of impedance 76 permits the zero of the circuit to be adjusted. Specification 646,981 is referred to.
GB15263/47A 1946-06-12 1947-06-10 Electrical measuring apparatus Expired GB630638A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US630638XA 1946-06-12 1946-06-12

Publications (1)

Publication Number Publication Date
GB630638A true GB630638A (en) 1949-10-18

Family

ID=22046674

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15263/47A Expired GB630638A (en) 1946-06-12 1947-06-10 Electrical measuring apparatus

Country Status (1)

Country Link
GB (1) GB630638A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2993377A (en) * 1958-04-07 1961-07-25 Ca Nat Research Council Direct reading resistance thermometer
US3060743A (en) * 1959-04-13 1962-10-30 Gen Electric Linearized measuring device
US3077561A (en) * 1959-04-15 1963-02-12 Robertshaw Fulton Controls Co Bridge compensating circuit
GB2219663A (en) * 1988-06-09 1989-12-13 Samsung Electronic Automatic bread making machine temperature detecting circuit
US9687169B2 (en) 2011-12-08 2017-06-27 Kimberly-Clark Worldwide, Inc. System, controller, and method for determining conductance of an object

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2993377A (en) * 1958-04-07 1961-07-25 Ca Nat Research Council Direct reading resistance thermometer
US3060743A (en) * 1959-04-13 1962-10-30 Gen Electric Linearized measuring device
US3077561A (en) * 1959-04-15 1963-02-12 Robertshaw Fulton Controls Co Bridge compensating circuit
GB2219663A (en) * 1988-06-09 1989-12-13 Samsung Electronic Automatic bread making machine temperature detecting circuit
GB2219663B (en) * 1988-06-09 1993-03-31 Samsung Electronic A temperature detecting circuit of an automatic bread baking machine
US9687169B2 (en) 2011-12-08 2017-06-27 Kimberly-Clark Worldwide, Inc. System, controller, and method for determining conductance of an object

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