GB1002738A - Improvements in or relating to devices, in particular safety devices, responsive to pulses - Google Patents

Improvements in or relating to devices, in particular safety devices, responsive to pulses

Info

Publication number
GB1002738A
GB1002738A GB2146962A GB2146962A GB1002738A GB 1002738 A GB1002738 A GB 1002738A GB 2146962 A GB2146962 A GB 2146962A GB 2146962 A GB2146962 A GB 2146962A GB 1002738 A GB1002738 A GB 1002738A
Authority
GB
United Kingdom
Prior art keywords
frequency
curve
capacitor
pulse input
level
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
GB2146962A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries 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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1002738A publication Critical patent/GB1002738A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G01R23/06Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into an amplitude of current or voltage
    • G01R23/09Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into an amplitude of current or voltage using analogue integrators, e.g. capacitors establishing a mean value by balance of input signals and defined discharge signals or leakage

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

1,002,738. Frequency detectors. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. June 4, 1962 [June 7, 1961], No. 21469/62. Heading H3A. A safety circuit responsive to the frequency of input pulses at V 1 comprises (a) a diode-pump C 1 , D 1 , D 2 , C 3 which tends to charge capacitor C 3 to a negative voltage (curve 2, Fig. 2) substantially proportional to the pulse input frequency n, and (b) a diode pump C 2 , D 3 , D 4 , C 4 which tends to charge the capacitor C 3 over resistor R 1 in the opposite sense to a voltage (curve 1, Fig. 2) which is substantially constant from a very low value of pulse input frequency. The resultant output voltage V 2 (curve 3) across capacitor 3, causes a switching operation when its level exceeds a level shown at 4 i.e. when the pulse input frequency n exceeds a predetermined value P but is less than a larger predetermined value Q. An alarm is given when the output voltage is below the level 4 i.e. when n < P or when n > Q. The device may be used to indicate excessive radio-active radiation, in a liquid level indicator using a radio-active isotope or in a safety device against excessive speed of a motor.
GB2146962A 1961-06-07 1962-06-04 Improvements in or relating to devices, in particular safety devices, responsive to pulses Expired GB1002738A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL265683 1961-06-07

Publications (1)

Publication Number Publication Date
GB1002738A true GB1002738A (en) 1965-08-25

Family

ID=19753080

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2146962A Expired GB1002738A (en) 1961-06-07 1962-06-04 Improvements in or relating to devices, in particular safety devices, responsive to pulses

Country Status (1)

Country Link
GB (1) GB1002738A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0051906A2 (en) * 1980-11-06 1982-05-19 British Gas Corporation Fuel burner control system circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0051906A2 (en) * 1980-11-06 1982-05-19 British Gas Corporation Fuel burner control system circuit
EP0051906A3 (en) * 1980-11-06 1983-02-09 British Gas Corporation Fuel burner control system circuit

Similar Documents

Publication Publication Date Title
GB1005903A (en) Improvements in electrical integrating totalizer
GB1090047A (en) Improvements in or relating to integrating analog-to-digital converter
GB1054058A (en)
GB1036564A (en) Integrator
GB1030479A (en) A detector of pulses exceeding a predetermined length
GB1370926A (en) X-ray exposure control apparatus
GB1281057A (en) A method of and an apparatus for eliminating misleading doppler signals
GB1176347A (en) Monitor and Delay Network
GB1002738A (en) Improvements in or relating to devices, in particular safety devices, responsive to pulses
GB1142695A (en) Automatic phase control system
GB1530297A (en) Circuit arrangement for noise level suppression
GB1154332A (en) Improvements in or relating to Minimum Detector Circuits
US3351783A (en) Means for simulating learning, forgetting and other like processes
US4185253A (en) Temperature sensitive relaxation oscillator
GB1006314A (en) Voltage threshold detector
GB1435910A (en) Detector for alternating-current signals
GB1259997A (en) Method and device for modulating or stabilizing a neutron flux obtained from an ion accelerator
GB1374683A (en) Signal monitoring circuits
GB987871A (en) Switching circuit
US3074642A (en) Analog accumulator
GB942978A (en) Pulse counting apparatus
GB1397524A (en) Amplitude-to-frequency converter
FR2296314A1 (en) Pulse counting circuit - using a Geiger-Muller detector with time base varying with pulse input frequency
SU664295A1 (en) Device for resetting digital automatics circuits to initial state
JPS57152725A (en) Discriminating circuit for signal pulse width