GB635674A - Improvements in or relating to wheatstone bridge resistance measuring circuits - Google Patents

Improvements in or relating to wheatstone bridge resistance measuring circuits

Info

Publication number
GB635674A
GB635674A GB855648A GB855648A GB635674A GB 635674 A GB635674 A GB 635674A GB 855648 A GB855648 A GB 855648A GB 855648 A GB855648 A GB 855648A GB 635674 A GB635674 A GB 635674A
Authority
GB
United Kingdom
Prior art keywords
resistance
cathode
resistances
circuit
relating
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
GB855648A
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.)
Marconi Instruments Ltd
Original Assignee
Marconi Instruments 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 Marconi Instruments Ltd filed Critical Marconi Instruments Ltd
Priority to GB855648A priority Critical patent/GB635674A/en
Publication of GB635674A publication Critical patent/GB635674A/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)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

635,674. Resistances measuring. MARCONI INSTRUMENTS, Ltd., and BROCKELSBY, C. F. March 23, 1948, No. 8556. [Class 37] A circuit for measuring resistance comprises a bridge comprising resistances R1, R2, R3 and the anode-cathode path and cathode resistance R4, P of a valve, the resistance P being tapped at S to a resistance R5 connected to the grid of valve V and the unknown resistance X being connected between a point of constant potential and a tap SW on resistance R5. In operation, the bridge is balanced in the absence of X by setting S to the cathode end of P and varying R4; X is then put in circuit and the taps SW (coarse) and P (fine) adjusted to restore balance, the value of X corresponding to the settings of SW and P. An adjustable potential source may replace R4. A protective resistance may be connected to X2 to prevent X1, X2 being short-circuited. Resistances P, R5 may be calibrated in logarithmic units. The resistance X may be a specimen whose resistance varies with moisture so that the circuit acts as a moisture meter. Resistance R2 may be connected to the cathode instead of to P, or a resistance may be connected between the cathode and a positive point on source B.
GB855648A 1948-03-23 1948-03-23 Improvements in or relating to wheatstone bridge resistance measuring circuits Expired GB635674A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB855648A GB635674A (en) 1948-03-23 1948-03-23 Improvements in or relating to wheatstone bridge resistance measuring circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB855648A GB635674A (en) 1948-03-23 1948-03-23 Improvements in or relating to wheatstone bridge resistance measuring circuits

Publications (1)

Publication Number Publication Date
GB635674A true GB635674A (en) 1950-04-12

Family

ID=9854731

Family Applications (1)

Application Number Title Priority Date Filing Date
GB855648A Expired GB635674A (en) 1948-03-23 1948-03-23 Improvements in or relating to wheatstone bridge resistance measuring circuits

Country Status (1)

Country Link
GB (1) GB635674A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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