GB450864A - Improvements in electrical measuring and/or signalling systems - Google Patents

Improvements in electrical measuring and/or signalling systems

Info

Publication number
GB450864A
GB450864A GB238535A GB238535A GB450864A GB 450864 A GB450864 A GB 450864A GB 238535 A GB238535 A GB 238535A GB 238535 A GB238535 A GB 238535A GB 450864 A GB450864 A GB 450864A
Authority
GB
United Kingdom
Prior art keywords
output
motor generator
frequency
measured
speed
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
GB238535A
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.)
AUTOMATIC ELECTRIC CO Ltd
Original Assignee
AUTOMATIC ELECTRIC CO 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 AUTOMATIC ELECTRIC CO Ltd filed Critical AUTOMATIC ELECTRIC CO Ltd
Priority to GB238535A priority Critical patent/GB450864A/en
Publication of GB450864A publication Critical patent/GB450864A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

450,864. Frequency measurements. AUTOMATIC ELECTRIC CO., Ltd., Strowger Works, Liverpool, and RAYNER, T. R., 2, Stretton Avenue, Wallasey, Cheshire. Jan. 24, 1935, No. 2835. [Class 37] [See also Group XXXVIII] Frequency measurements are effected by comparing the output of a synchronous motor generator driven at a speed corresponding to the frequency to be measured with the output of a second motor generator run at a known speed. As shown, the current of the frequency to be measured operates a synchronous motor generator S1, DI through an amplifier demodulator D, the output of the generator D1 being connected in opposition through a central-zero instrument G to the output of a motor generator S2, D2 driven at known speed by an oscillator under the control of a tuning-fork TF. Several measurements may be effected simultaneously over the same circuit by utilizing carrier currents of different frequencies modulated by the currents to be measured. When the system is arranged to give a number of indications a single standard speed motor drives a number of generators or a number of separate motor generators are provided.
GB238535A 1935-01-24 1935-01-24 Improvements in electrical measuring and/or signalling systems Expired GB450864A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB238535A GB450864A (en) 1935-01-24 1935-01-24 Improvements in electrical measuring and/or signalling systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB238535A GB450864A (en) 1935-01-24 1935-01-24 Improvements in electrical measuring and/or signalling systems

Publications (1)

Publication Number Publication Date
GB450864A true GB450864A (en) 1936-07-24

Family

ID=9738611

Family Applications (1)

Application Number Title Priority Date Filing Date
GB238535A Expired GB450864A (en) 1935-01-24 1935-01-24 Improvements in electrical measuring and/or signalling systems

Country Status (1)

Country Link
GB (1) GB450864A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2425613A (en) * 1941-06-28 1947-08-12 Borg George W Corp Timing apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2425613A (en) * 1941-06-28 1947-08-12 Borg George W Corp Timing apparatus

Similar Documents

Publication Publication Date Title
FR2366581A1 (en) MARINE RADAR
GB450864A (en) Improvements in electrical measuring and/or signalling systems
JPS5291109A (en) Motor with frequency generator
GB1299031A (en) Device for monitoring the speed of gyroscopes
DE59009689D1 (en) Residual current circuit breaker with transducer circuit with device for balancing signal curves.
JPS5338311A (en) Reading system
JPS5376079A (en) Voltage detecting circuit
JPS5437405A (en) Optical output stabilizing method
SU532822A1 (en) The method of adjusting the anti-torque moment of induction meters
AT361985B (en) SYSTEM FOR CENTRALLY GENERATING AN ENVELOPE INTERLOCKED TIME MULTIPLEX SIGNAL
AT389008B (en) DEVICE FOR THE CONTACTLESS GENERATION OF ELECTRICAL IMPULSES
JPS51137353A (en) Amplitude limiting circuit
JPS5416965A (en) Timing pulse generator circuit
SU570709A1 (en) Device for locating cutting-loading machine
JPS5372411A (en) Signal transmission system
GB530893A (en) Improvements in or relating to carrier current signalling systems
GB1235218A (en) Rotation-responsive means
JPS51117815A (en) Input level indicator circuit
JPS52153369A (en) Frequency deviation modulation/demodulation
JPS5250606A (en) Driving circuit of signal indicator in radio receiver
FR1186320A (en) Start-stop telegraph signal generator
JPS52150922A (en) Am receiver
JPS5226260A (en) Measuring circuit
JPS5315857A (en) Electric power measuring system
JPS5332321A (en) Acceleration and deceleration control system for ac motor