GB797542A - Improvements relating to bridge network balance detectors - Google Patents

Improvements relating to bridge network balance detectors

Info

Publication number
GB797542A
GB797542A GB2322255A GB2322255A GB797542A GB 797542 A GB797542 A GB 797542A GB 2322255 A GB2322255 A GB 2322255A GB 2322255 A GB2322255 A GB 2322255A GB 797542 A GB797542 A GB 797542A
Authority
GB
United Kingdom
Prior art keywords
electrodes
resistance
bridge
currents
over
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
GB2322255A
Inventor
Dennis Allenden
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.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries Ltd
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 Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB2322255A priority Critical patent/GB797542A/en
Publication of GB797542A publication Critical patent/GB797542A/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
    • G01R17/16—AC or DC measuring bridges with discharge tubes or semiconductor devices in one or more arms of the bridge, e.g. voltmeter using a difference amplifier

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

797,542. Bridge measurements. ASSOCIATED ELECTRICAL INDUSTRIES, Ltd. July 31, 1956 [Aug. 11, 1955], No. 23222/55. Class 37. [Also in Group XL (c)] A D.C. excited Wheatstone bridge comprises ratio arms R1, R2, standard resistance R3 and variable resistance G controlled, e.g., by a Pirani vacuum gauge. The base electrodes of transistors TR1, TR2 are connected to the diagonal junctions A, B of R1, G and R2, R3, while the emitter electrodes are connected to the positive side of the bridge excitation over a high resistance R6 and a microammeter M is connected between the collector electrodes, which are biased over resistances R4, R5 from a source returned to the negative side of the bridge excitation. Unbalance voltage between AB causes corresponding currents to flow in the base/emitter circuits which are amplified by a factor α/1-α, where a is the transistor current gain, and the amplified currents in the collector electrodes deflect the meter to indicate the magnitude and sense of unbalance. If resistance R6 is high by comparison with that over which the base electrodes are fed, the collector currents are stated to be stabilized for temperature variations.
GB2322255A 1955-08-11 1955-08-11 Improvements relating to bridge network balance detectors Expired GB797542A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2322255A GB797542A (en) 1955-08-11 1955-08-11 Improvements relating to bridge network balance detectors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2322255A GB797542A (en) 1955-08-11 1955-08-11 Improvements relating to bridge network balance detectors

Publications (1)

Publication Number Publication Date
GB797542A true GB797542A (en) 1958-07-02

Family

ID=10192135

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2322255A Expired GB797542A (en) 1955-08-11 1955-08-11 Improvements relating to bridge network balance detectors

Country Status (1)

Country Link
GB (1) GB797542A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3040249A (en) * 1958-10-01 1962-06-19 Westinghouse Electric Corp Low voltage tester
US3169168A (en) * 1960-08-24 1965-02-09 Bell Telephone Labor Inc Validity checking circuit
GB2166555A (en) * 1984-11-05 1986-05-08 Fluke Mfg Co John Impedance measuring method and apparatus
US4716361A (en) * 1984-11-05 1987-12-29 John Fluke Mfg. Co., Inc. Capacitance measuring method and apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3040249A (en) * 1958-10-01 1962-06-19 Westinghouse Electric Corp Low voltage tester
US3169168A (en) * 1960-08-24 1965-02-09 Bell Telephone Labor Inc Validity checking circuit
GB2166555A (en) * 1984-11-05 1986-05-08 Fluke Mfg Co John Impedance measuring method and apparatus
US4716361A (en) * 1984-11-05 1987-12-29 John Fluke Mfg. Co., Inc. Capacitance measuring method and apparatus

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