GB1169537A - Improvements in or relating to Mean Level Volt Meters - Google Patents

Improvements in or relating to Mean Level Volt Meters

Info

Publication number
GB1169537A
GB1169537A GB4914565A GB4914565A GB1169537A GB 1169537 A GB1169537 A GB 1169537A GB 4914565 A GB4914565 A GB 4914565A GB 4914565 A GB4914565 A GB 4914565A GB 1169537 A GB1169537 A GB 1169537A
Authority
GB
United Kingdom
Prior art keywords
voltage
instrument
resistor
input
nov
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
GB4914565A
Inventor
William Spencer Percival
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB4914565A priority Critical patent/GB1169537A/en
Publication of GB1169537A publication Critical patent/GB1169537A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/22—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of ac into dc
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0023—Measuring currents or voltages from sources with high internal resistance by means of measuring circuits with high input impedance, e.g. OP-amplifiers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

1, 169, 537. Voltage measurement. ELECTRIC & MUSICAL INDUSTRIES Ltd. Nov. 10, 1966 [Nov. 19, 1965), No.49145/65. Heading G1U. A mean level A. C. voltage measuring arrangement incorporates a diode bridge arrangement 1 - 4 across one diagonal of which, A. C., the input voltage to be measured is applied, while across the other a D. C. instrument 9 in series with a resistor 10 is connected. The diodes are biased by a standing current through the instrument 9, derived by applying a voltage at 11 to the instrument circuit. In this way errors occurring with low inputs, which would normally cause the diodes to operate over non-linear parts of their characteristics, are avoided. The biasing voltage and the various resistance values are selected so that the instrument reading is completely accurate for at least two values of input. In a modification Fig. 2 (not shown) the resistor 10 is shunted by a diode and resistor to increase the accuracy of the arrangement. In a further modification Fig. 3 (not shown) accuracy is increased by applying the input through a negative feedback amplifier which has the circuit described above connected both as its load circuit, and to provide a current feedback path in the amplifier.
GB4914565A 1965-11-19 1965-11-19 Improvements in or relating to Mean Level Volt Meters Expired GB1169537A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4914565A GB1169537A (en) 1965-11-19 1965-11-19 Improvements in or relating to Mean Level Volt Meters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4914565A GB1169537A (en) 1965-11-19 1965-11-19 Improvements in or relating to Mean Level Volt Meters

Publications (1)

Publication Number Publication Date
GB1169537A true GB1169537A (en) 1969-11-05

Family

ID=10451331

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4914565A Expired GB1169537A (en) 1965-11-19 1965-11-19 Improvements in or relating to Mean Level Volt Meters

Country Status (1)

Country Link
GB (1) GB1169537A (en)

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