GB654159A - Device for detecting and indicating electric potentials - Google Patents

Device for detecting and indicating electric potentials

Info

Publication number
GB654159A
GB654159A GB25061/47A GB2506147A GB654159A GB 654159 A GB654159 A GB 654159A GB 25061/47 A GB25061/47 A GB 25061/47A GB 2506147 A GB2506147 A GB 2506147A GB 654159 A GB654159 A GB 654159A
Authority
GB
United Kingdom
Prior art keywords
potential
range
output
tube
switches
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
GB25061/47A
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.)
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
Publication of GB654159A publication Critical patent/GB654159A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
    • H03C1/54—Balanced modulators, e.g. bridge type, ring type or double balanced type
    • H03C1/56—Balanced modulators, e.g. bridge type, ring type or double balanced type comprising variable two-pole elements only
    • H03C1/58—Balanced modulators, e.g. bridge type, ring type or double balanced type comprising variable two-pole elements only comprising diodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/38—Signalling arrangements; Manipulation of signalling currents using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Generation Of Surge Voltage And Current (AREA)

Abstract

654,159. Non-contact-making relays. STANDARD TELEPHONES & CABLES, Ltd. Sept. 12, 1947, No. 25061. Convention date, Dec. 18, 1945. [Class 40 (iv)] In an arrangement, Fig. 4, for detecting an electric potential falling within a specific narrow range, an A.C. source is connected to a discharge tube CC and a relay R through two static electrical switches A, B controlled by the potential vp under test. The switches shown are biassed rectifiers but may be thermistor trigger circuits, hot or cold cathode discharge tubes, hard tube trigger circuits or cathode-ray tubes. One switch A controls the discharge tube when the potential is higher than the specified range and the other B controls the tube when the potential is lower than the range. The output is effective to operate relay R either in the range in which the output characteristics of the two sections overlap or in a gap between the two characteristics. Fig. 5 shows output curves a, b characteristic of the two switches, vb being the voltage required to operate CC and c the combined output of the two sections. The width of the bend xy may be controlled by adjustment of bias potentials x+y, x - y applied to the mid-points of the secondary windings of the input transformer T<SP>1</SP>. By interchanging the bias connections of the two secondary windings, Fig. 13, the output characteristic shown in Fig. 12 is produced. The tube CC<SP>1</SP> is normally operated and is extinguished by a potential within the range. A second discharge tube CC<SP>2</SP> operates with relay R as CC<SP>1</SP> extinguishes. The two switches of Figs. 4, 13 may be separated, Figs. 3, 9 (not shown) the characteristics being as shown in Figs 5, 8. The circuit shown in Fig. 9 is the equivalent of a ring modulator by which it may be replaced. An earthed resistance W is provided in the arrangements of Figs. 4, 13 to prevent false operation when the test potential is disconnected.
GB25061/47A 1945-12-18 1947-09-12 Device for detecting and indicating electric potentials Expired GB654159A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL654159X 1945-12-18

Publications (1)

Publication Number Publication Date
GB654159A true GB654159A (en) 1951-06-06

Family

ID=19795173

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25061/47A Expired GB654159A (en) 1945-12-18 1947-09-12 Device for detecting and indicating electric potentials

Country Status (3)

Country Link
BE (1) BE477322A (en)
FR (1) FR58660E (en)
GB (1) GB654159A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1240947B (en) * 1962-09-12 1967-05-24 Siemens Ag Modulator circuit arrangement for keying in optional frequencies in message transmission systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1240947B (en) * 1962-09-12 1967-05-24 Siemens Ag Modulator circuit arrangement for keying in optional frequencies in message transmission systems

Also Published As

Publication number Publication date
BE477322A (en)
FR58660E (en) 1954-03-02

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