GB975373A - Measuring instrument for bio-electrical signals and the like - Google Patents

Measuring instrument for bio-electrical signals and the like

Info

Publication number
GB975373A
GB975373A GB2627962A GB2627962A GB975373A GB 975373 A GB975373 A GB 975373A GB 2627962 A GB2627962 A GB 2627962A GB 2627962 A GB2627962 A GB 2627962A GB 975373 A GB975373 A GB 975373A
Authority
GB
United Kingdom
Prior art keywords
transformer
amplifier
input
rectifier
july
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
GB2627962A
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Publication of GB975373A publication Critical patent/GB975373A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/38—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers
    • H03F3/387—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers with semiconductor devices only

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)

Abstract

975,373. Electromedical apparatus. HITACHI SEISAKUSHO KABUSHIKI KAISHA. July 9, 1962 [July 10, 1961; July 12, 1961], No. 26279/62. Heading A5K. In order to reduce the weight of an electrocardiograph the use of a mains transformer is avoided by connecting the amplifier directly to the supply through a rectifier and suitable voltage control means and to avoid risk to the patient the input terminals are insulated from the amplifier by a coupling transformer. The weight of the latter is also minimized by converting the input to a modulated high frequency which is subsequently demodulated in the amplifier. The basic circuit provides an amplifier 6 connected to the mains supply (100 v.) through a rectifier and voltage-dropping impedance 10, and with its input fed through a transformer 5 from the input terminals 3, 4. The actual input is converted to modulated H.F. by a high frequency introduced into the circuit through a rectifier 1. Interference due to stray capacity in the coupling transformer may be overcome by earthing the secondary winding, but this necessitates the insertion of a transformer-coupled pre-amplifier which may be powered by rectifying the output from an additional winding on the H.F. transformer. In cases where an electric motor is provided for driving a recording mechanism, this motor may be used as the voltage dropping impedance.
GB2627962A 1961-07-10 1962-07-09 Measuring instrument for bio-electrical signals and the like Expired GB975373A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2402461 1961-07-10
JP2431961 1961-07-12

Publications (1)

Publication Number Publication Date
GB975373A true GB975373A (en) 1964-11-18

Family

ID=26361484

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2627962A Expired GB975373A (en) 1961-07-10 1962-07-09 Measuring instrument for bio-electrical signals and the like

Country Status (1)

Country Link
GB (1) GB975373A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3595221A (en) * 1969-03-04 1971-07-27 Matburn Holdings Ltd Endoscopic having illumination supply unit
US3690313A (en) * 1970-10-09 1972-09-12 Mennen Greatbatch Electronics Electrically isolated signal path means for a physiological monitor
US3811428A (en) * 1971-12-30 1974-05-21 Brattle Instr Corp Biological signals monitor
US3937214A (en) * 1972-07-07 1976-02-10 Hutchins Iv Thomas B Electromedical patient monitoring system
EP1504543A2 (en) * 2002-05-14 2005-02-09 Ess Technology, Inc. Data access arrangement using a high frequency transformer for electrical isolation

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3595221A (en) * 1969-03-04 1971-07-27 Matburn Holdings Ltd Endoscopic having illumination supply unit
US3690313A (en) * 1970-10-09 1972-09-12 Mennen Greatbatch Electronics Electrically isolated signal path means for a physiological monitor
US3811428A (en) * 1971-12-30 1974-05-21 Brattle Instr Corp Biological signals monitor
US3937214A (en) * 1972-07-07 1976-02-10 Hutchins Iv Thomas B Electromedical patient monitoring system
EP1504543A2 (en) * 2002-05-14 2005-02-09 Ess Technology, Inc. Data access arrangement using a high frequency transformer for electrical isolation
EP1504543A4 (en) * 2002-05-14 2008-08-27 Ess Technology Inc Data access arrangement using a high frequency transformer for electrical isolation

Similar Documents

Publication Publication Date Title
GB1374658A (en) Electroencephalophone and feedback system
ES8303738A1 (en) Power supply apparatus.
GB995380A (en) Improvements in or relating to electrical apparatus
GB975373A (en) Measuring instrument for bio-electrical signals and the like
ES8800545A1 (en) Current loop arrangements.
JPS5554443A (en) Electric current measuring instrument
GB1347225A (en) Voltage generators
JPS5711466A (en) Dc/dc converter built-in battery system
JPS5533399A (en) Bipolar input signal converting circuit into current
JPS5614128A (en) Multipoint temperature measuring instrument for rotor
ES479965A1 (en) X-ray sources
GB961712A (en) Improvements in or relating to electrical apparatus for mains operation
GB1027320A (en) Apparatus for direct indication of the heart current curve on an oscilloscopic tube with a luminescent coating
JPS5672597A (en) Microphone unit
SU864150A1 (en) Current sensor for frequency-contolled thyristorized drives
GB1182412A (en) Improvements in or relating to Current Measurement
GB982224A (en) High voltage supply source
DE3261624D1 (en) Apparatus for electroacoustic energy conversion
GB1150125A (en) Oral Muscular Controlled Electronic Actuating Means
JPS5523610A (en) Isolator
ES477641A1 (en) DC supply system for electric traction motor - has auto-transformer connected between inverter and secondary winding of adaptor transformer
JPS5523611A (en) Isolator
JPS57196871A (en) Full-wave rectifying circuit
JPS6466803A (en) Rotary magnetic head device
JPS5592059A (en) Main line amplifier for direct current pulse transmission