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
GB39366/30A
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.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens AG
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Filing date
Publication date
Application filed by Siemens and Halske AG, Siemens AGfiledCriticalSiemens and Halske AG
Publication of GB376239ApublicationCriticalpatent/GB376239A/en
Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body
(AREA)
Abstract
In an electro-cardiograph with an amplifier and needle galvanometer, the sensitiveness is altered by regulating the degree of amplification of the amplifier. A resistance capacity amplifier can be used in which the anode or grid resistances are variable, and in the preferred arrangement, a three-stage amplifier is used in which the anode or grid resistance of the penultimate stage is variable.
GB39366/30A1930-10-281930-12-31Arrangement for regulating the sensitiveness of electro-cardiographs
ExpiredGB376239A
(en)
Device for keeping constant the anode quiescent current (direct current) on amplifier tubes with two or more grids for low frequency amplifiers in resistance coupling.
Radio receiver with High Frequency Gain and Low Frequency Gain as well as Devices for Automatic Regulation of the Power of the High Frequency Amplifier Output Energy.