GB353534A - Improvements in electrical measuring instruments - Google Patents

Improvements in electrical measuring instruments

Info

Publication number
GB353534A
GB353534A GB1333530A GB1333530A GB353534A GB 353534 A GB353534 A GB 353534A GB 1333530 A GB1333530 A GB 1333530A GB 1333530 A GB1333530 A GB 1333530A GB 353534 A GB353534 A GB 353534A
Authority
GB
United Kingdom
Prior art keywords
relay
ammeter
buzzer
closes
parallel
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
GB1333530A
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.)
HENRY RICHARD STOCKS
STC PLC
Original Assignee
HENRY RICHARD STOCKS
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 HENRY RICHARD STOCKS, Standard Telephone and Cables PLC filed Critical HENRY RICHARD STOCKS
Priority to GB1333530A priority Critical patent/GB353534A/en
Publication of GB353534A publication Critical patent/GB353534A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/002—Switches for altering the measuring range or for multitesters

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

353,534. Current meters. STANDARD TELEPHONES & CABLES, Ltd. and STOCKS, H. R., Columbia House, Aldwych, London. April 30, 1930, No. 13335. [Class 37.] The range of an ammeter is changed by means of a commutator 12 which varies the amount of shunt resistance in parallel with the moving coil 3, a subdial 6 connected by flexible bands 8 to the commutator shaft 9 being simultaneously moved so as to expose the corresponding scale graduations through openings 31 in the dial 5. In parallel with the moving coil 3 is a sensitive relay A which, at a predetermined maximum value of the current through the coil 3, closes the circuit of a relay B which disconnects the ammeter and operates an alarm such as a buzzer Z. On turning the shaft 9 to change the range, a notched wheel 38 closes and opens a contact which short-circuits the relay B and thus resets the ammeter. A key T is provided for testing the action of the relay B or buzzer Z.
GB1333530A 1930-04-30 1930-04-30 Improvements in electrical measuring instruments Expired GB353534A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1333530A GB353534A (en) 1930-04-30 1930-04-30 Improvements in electrical measuring instruments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1333530A GB353534A (en) 1930-04-30 1930-04-30 Improvements in electrical measuring instruments

Publications (1)

Publication Number Publication Date
GB353534A true GB353534A (en) 1931-07-30

Family

ID=10021053

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1333530A Expired GB353534A (en) 1930-04-30 1930-04-30 Improvements in electrical measuring instruments

Country Status (1)

Country Link
GB (1) GB353534A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2425811A (en) * 1942-06-05 1947-08-19 Conn Ltd C G Apparatus for measuring voltages
DE1177356B (en) * 1955-06-30 1964-09-03 Johannes Perthen Dr Ing Device for electrical measurement of lengths, changes in length or other measurable variables that can be represented by length sizes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2425811A (en) * 1942-06-05 1947-08-19 Conn Ltd C G Apparatus for measuring voltages
DE1177356B (en) * 1955-06-30 1964-09-03 Johannes Perthen Dr Ing Device for electrical measurement of lengths, changes in length or other measurable variables that can be represented by length sizes

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