GB1370791A - Zero correcting circuit - Google Patents

Zero correcting circuit

Info

Publication number
GB1370791A
GB1370791A GB106871A GB106871A GB1370791A GB 1370791 A GB1370791 A GB 1370791A GB 106871 A GB106871 A GB 106871A GB 106871 A GB106871 A GB 106871A GB 1370791 A GB1370791 A GB 1370791A
Authority
GB
United Kingdom
Prior art keywords
signal
capacitor
amplifier
stored
inverted
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
GB106871A
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.)
Roche Products Ltd
Original Assignee
Roche Products 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 Roche Products Ltd filed Critical Roche Products Ltd
Priority to GB106871A priority Critical patent/GB1370791A/en
Publication of GB1370791A publication Critical patent/GB1370791A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/01—Shaping pulses
    • H03K5/08—Shaping pulses by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding
    • H03K5/082—Shaping pulses by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding with an adaptive threshold
    • H03K5/086—Shaping pulses by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding with an adaptive threshold generated by feedback
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
    • A61B5/085—Measuring impedance of respiratory organs or lung elasticity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
    • G01L9/0076—Transmitting or indicating the displacement of flexible diaphragms using photoelectric means
    • G01L9/0077—Transmitting or indicating the displacement of flexible diaphragms using photoelectric means for measuring reflected light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
    • G01L9/06—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of piezo-resistive devices

Abstract

1370791 Zero-drift correction in photo-electric apparatus ROCHE PRODUCTS Ltd 6 Jan 197 2 [8 Jan 1971] 1068/71 Heading G1A Drift of an A. C. signal, such as the output from an electro-manometer used in respiratory testing of animals, relative to a D.C. reference level is eliminated by a circuit arrangement in which the signal is biased to an extent ensuring a negative going portion, the negative going portion is inverted, the peak value of the inverted signal is stored, and the stored signal is added to the original signal together with a component removing the original bias, to restore the reference level. The signal is amplified, inverted, and the negative going portion selected in the amplifier and circuit arrangement 302, Fig.3a, the bias being developed across a resistor 316 and the selected output being stored in capacitor 318. When the negative potential of the input signal overcomes diode 340, Fig. 3b to which it is applied via resistor 333 amplifier 332 terminals 305, capacitor 38, and amplifier 339, a pair of flip-flops 349, 350, and 356, 357, are actuated in succession to produce pulses A and B which effect the transfer of the stored signal from capacitor 18 to a capacitor 320 by which it is applied through FET 321 to the adding amplifier 332, and reset the storage circuit by partially discharging capacitor 318, respectively. The pulses A and B may also be used to reset an integrator in a measuring circuit and to effect a recording of the integrated value. In the respiratory test described the effect of a broncho strictor agent is determined in an arrangement in which lung 104 Fig.1 is inflated by a constant volume pump at a constant pressure determined by bubble device 106 and the air overflow is determined by a photo-electric micro-manometer 109.
GB106871A 1972-01-06 1972-01-06 Zero correcting circuit Expired GB1370791A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB106871A GB1370791A (en) 1972-01-06 1972-01-06 Zero correcting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB106871A GB1370791A (en) 1972-01-06 1972-01-06 Zero correcting circuit

Publications (1)

Publication Number Publication Date
GB1370791A true GB1370791A (en) 1974-10-16

Family

ID=9715626

Family Applications (1)

Application Number Title Priority Date Filing Date
GB106871A Expired GB1370791A (en) 1972-01-06 1972-01-06 Zero correcting circuit

Country Status (1)

Country Link
GB (1) GB1370791A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4324513A1 (en) * 1993-07-21 1995-01-26 Zwosta Helge Dipl Ing Fh Method, circuit and measurement pickup for detecting physical quantities by selective measurement of electrical quantities of the response signal
CN101968505A (en) * 2010-09-14 2011-02-09 深圳市华力特电气股份有限公司 Null shift controlling method and device
CN111811727A (en) * 2020-07-14 2020-10-23 四川卓融电气设备有限公司 Oil pressure on-line monitoring system of power oil-less equipment

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4324513A1 (en) * 1993-07-21 1995-01-26 Zwosta Helge Dipl Ing Fh Method, circuit and measurement pickup for detecting physical quantities by selective measurement of electrical quantities of the response signal
CN101968505A (en) * 2010-09-14 2011-02-09 深圳市华力特电气股份有限公司 Null shift controlling method and device
CN101968505B (en) * 2010-09-14 2012-10-03 深圳市华力特电气股份有限公司 Null shift controlling method and device
CN111811727A (en) * 2020-07-14 2020-10-23 四川卓融电气设备有限公司 Oil pressure on-line monitoring system of power oil-less equipment
CN111811727B (en) * 2020-07-14 2022-03-11 四川卓融电气设备有限公司 Oil pressure on-line monitoring system of power oil-less equipment

Similar Documents

Publication Publication Date Title
GB1249470A (en) Apparatus and method for measuring the dividing particle size of a particulate system
GB1370791A (en) Zero correcting circuit
GB1281984A (en) Improvements in or relating to peak detection circuits
KR850006275A (en) Gain control amplifier
GB1518148A (en) Measuring apparatus
US2940037A (en) Capacitance meter
ES475260A1 (en) Pulsed voltage amplification device with drift correction
GB773470A (en) Improvements in or relating to detector-circuit arrangements
US3233185A (en) Electrical signal amplifier
GB892236A (en) Improvements in or relating to transistor modulators
SU414595A1 (en)
JPS5587957A (en) Voltage detection circuit
SU960853A1 (en) Signal integrating device
SU447619A1 (en) Method for measuring low DC voltages
BAYER Analysis of the gain stability and linearity of an active electronic circuit working with large signals(Input signal dynamics for analyzing gain stability and linearity of electronic circuit working with large signals)
GB1415516A (en) Capacitive computer circuits
GB1004415A (en) Improvements in or relating to the determination of road traffic conditions
SU658573A1 (en) Logarithmic dc amplifier
SU387383A1 (en) I YOUR UNION
SU913079A1 (en) Concentration meter
SU136906A1 (en) Integrator on a magnetic amplifier
SU432888A1 (en) DEVICE FOR MEASUREMENT OF FREQUENCY PULSAVDY OF DOIRE EQUIPMENT
GB1517157A (en) Amplifier circuits
GB939686A (en) Improvements in or relating to gas chromatograph apparatus
SU711663A1 (en) Arrangement for detecting amplitude-modulated signals

Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed