GB629260A - Improvements in or relating to electric signalling or control systems - Google Patents

Improvements in or relating to electric signalling or control systems

Info

Publication number
GB629260A
GB629260A GB1873746A GB1873746A GB629260A GB 629260 A GB629260 A GB 629260A GB 1873746 A GB1873746 A GB 1873746A GB 1873746 A GB1873746 A GB 1873746A GB 629260 A GB629260 A GB 629260A
Authority
GB
United Kingdom
Prior art keywords
potential
impulsing
grid
time constant
point
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
GB1873746A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB1873746A priority Critical patent/GB629260A/en
Priority to ES0179500A priority patent/ES179500A1/en
Publication of GB629260A publication Critical patent/GB629260A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/02—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general by means of diodes

Landscapes

  • Measurement Of Resistance Or Impedance (AREA)
  • Adjustable Resistors (AREA)
  • Networks Using Active Elements (AREA)

Abstract

629,260. Variable time constant circuits. STANDARD TELEPHONES & CABLES, Ltd., McWHIRTER, E. M. S., and DUNN, R. H. June 21, 1946, No. 18737. [Class 40 (viii)] A variable time constant circuit comprises a reactive element in combination with two non-linear resistors normally biassed to a state of low conductivity but arranged so that one or other is biassed to a state of high conductivity on a rapid change of applied potential. The invention is applied to apparatus in which the rate of impulsing of a contact IP is required to be measured on a meter M. Thus the contact IP may be operated by a kilowatt-hour meter and the meter M required to register kilowatts. Contact IP alternately charges C2 negatively and discharges it into C1 which in turn discharges over the arms of the potentiometer R6 ... R10 so that the point A varies in potential about a mean determined by the rate of impulsing of IP. Condenser C1 is arranged as part of a negative feed-back circuit for the valve VI, thereby ensuring a linear relation between the depression of the mean potential of the point A and the rate of impulsing. The potential of this point is communicated to the grid of valve V2 through a time constant circuit comprising condenser C3 and a resistance comprising resistors R8, R9 and rectifiers D1, D2 in series-parallel. The standing voltages across R8, R9 are greater than the fluctuations due to the impulsing, so that for a steady rate of impulsing, when the grid of V2 has attained the potential of the point A the rectifiers D1, D2 are backbiassed to provide a high time constant and efficient smoothing. If, however, the rate of impulsing increases or decreases suddenly, the potential of the point A falls or rises compared with that of the grid of V2 and D1 or D2 becomes forward-biassed at the peaks of the fluctuations, to reduce the time constant of the circuit and permit of rapid equalization of the potentials of A and the grid of V2. Variations of the grid potential of V2 are registered on the meter M in the cathode circuit of the valve. Specifications 603,137 and 629,244, [Group XXXVI], are referred to.
GB1873746A 1946-06-21 1946-06-21 Improvements in or relating to electric signalling or control systems Expired GB629260A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1873746A GB629260A (en) 1946-06-21 1946-06-21 Improvements in or relating to electric signalling or control systems
ES0179500A ES179500A1 (en) 1946-06-21 1947-08-28 IMPROVEMENTS IN OR RELATED TO ELECTRICAL SIGNALING OR CONTROL SYSTEMS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1873746A GB629260A (en) 1946-06-21 1946-06-21 Improvements in or relating to electric signalling or control systems

Publications (1)

Publication Number Publication Date
GB629260A true GB629260A (en) 1949-09-15

Family

ID=10117540

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1873746A Expired GB629260A (en) 1946-06-21 1946-06-21 Improvements in or relating to electric signalling or control systems

Country Status (2)

Country Link
ES (1) ES179500A1 (en)
GB (1) GB629260A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2856468A (en) * 1952-10-27 1958-10-14 Cons Electrodynamics Corp Negative feedback amplifier in a measuring system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2856468A (en) * 1952-10-27 1958-10-14 Cons Electrodynamics Corp Negative feedback amplifier in a measuring system

Also Published As

Publication number Publication date
ES179500A1 (en) 1947-10-16

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