GB1169700A - Improvements in Electrical Test Equipment - Google Patents

Improvements in Electrical Test Equipment

Info

Publication number
GB1169700A
GB1169700A GB270366A GB270366A GB1169700A GB 1169700 A GB1169700 A GB 1169700A GB 270366 A GB270366 A GB 270366A GB 270366 A GB270366 A GB 270366A GB 1169700 A GB1169700 A GB 1169700A
Authority
GB
United Kingdom
Prior art keywords
multivibrators
input
output
fault
different
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
GB270366A
Inventor
Raymond William Eldred
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB270366A priority Critical patent/GB1169700A/en
Publication of GB1169700A publication Critical patent/GB1169700A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

1,169,700. Selective signalling. R. W. ELDRED. 17 Jan., 1967 [20 Jan., 1966], No. 2703/66. Heading G4H. [Also in Division G1] An arrangement for determining whether an applied voltage in the form of short, widely spaced pulses lies within determined limits incorporates three monostable multivibrators connected so as to respond to different levels of the input voltage. The outputs from those which respond are added together to provide an output signal which can take one of four values, the lower two indicating that the input is low, the third that it is within range and the fourth that it is high. The multivibrators 1, 2, 3 are connected to different tappings on a potential divider to which the input is applied, so that different values of inputs are required to reach the switching thresholds of the separate multivibrators. Alternatively an arrangement of multivibrators with different switching thresholds may be used. The sum of the multivibrator outputs is smoothed at 56 and compared in an amplifier 21 with a D.C. level at 22, set to correspond to the operation of two multivibrators. If the amplifier produces a fault voltage output a relay 26 operates to light a fault lamp, which enables a further circuit indicating whether the fault is high or low to be energized. Feedback may be applied to the multivibrator circuits, or the output of one used to gate a pulse stretcher following the adder circuit (Figs. 3 and 4, not shown). In these arrangements the output pulse width is varied in accordance with the input repetition frequency, so that the sum output signal is independent of frequency.
GB270366A 1966-01-20 1966-01-20 Improvements in Electrical Test Equipment Expired GB1169700A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB270366A GB1169700A (en) 1966-01-20 1966-01-20 Improvements in Electrical Test Equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB270366A GB1169700A (en) 1966-01-20 1966-01-20 Improvements in Electrical Test Equipment

Publications (1)

Publication Number Publication Date
GB1169700A true GB1169700A (en) 1969-11-05

Family

ID=9744309

Family Applications (1)

Application Number Title Priority Date Filing Date
GB270366A Expired GB1169700A (en) 1966-01-20 1966-01-20 Improvements in Electrical Test Equipment

Country Status (1)

Country Link
GB (1) GB1169700A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2123156A (en) * 1982-07-06 1984-01-25 Anthony Farrugia Ranged voltage monitor with out-of-range enunciators

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2123156A (en) * 1982-07-06 1984-01-25 Anthony Farrugia Ranged voltage monitor with out-of-range enunciators

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