GB1429929A - Device for measuring the rms value of an electrical signal - Google Patents

Device for measuring the rms value of an electrical signal

Info

Publication number
GB1429929A
GB1429929A GB2900672A GB2900672A GB1429929A GB 1429929 A GB1429929 A GB 1429929A GB 2900672 A GB2900672 A GB 2900672A GB 2900672 A GB2900672 A GB 2900672A GB 1429929 A GB1429929 A GB 1429929A
Authority
GB
United Kingdom
Prior art keywords
signal
measuring
heater
output voltage
unknown
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
GB2900672A
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.)
Gemalto Terminals Ltd
Original Assignee
Solartron Electronic Group 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 Solartron Electronic Group Ltd filed Critical Solartron Electronic Group Ltd
Priority to GB2900672A priority Critical patent/GB1429929A/en
Publication of GB1429929A publication Critical patent/GB1429929A/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
    • G01R19/02—Measuring effective values, i.e. root-mean-square values
    • G01R19/03—Measuring effective values, i.e. root-mean-square values using thermoconverters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/261—Amplifier which being suitable for instrumentation applications

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

1429929 Measuring rms values SOLARTRON ELECTRONIC GROUP Ltd 18 June 1973 [21 June 1972] 29006/72 Heading G1U A circuit for measuring the true r.m.s. value of an unknown waveform 10, Fig. 1 includes two thermal converters 22, 36, arranged in two loops: in the first loop both the unknown signal and a D.C. signal VD are applied to the heater of the first thermal converter 22 and its output voltage is compared with a reference voltage VR to adjust the signal VD so that the temperature of the heater is maintained substantially constant; and in the second loop both the signal VD and an A.C. signal from a source 38 are applied to the heater of the second thermal converter 36, and its output voltage minus the output voltage (which should be substantially constant equal to VR) of the first converter 22 is used to control the source 38 of the A.C. signal. Thus, providing the form of the A.C. signal is maintained constant - for example by using, as described, filters to produce a pure sine wave - by rectifying the A.C. signal, a D.C. output signal is obtained which represents the r.m.s value of the unknown input signal. A passive thermal converter using for example temperature sensitive resistors could be used, and the signal VD could be A.C. rather than D.C. in which case the A.C. signal from device 38 could be replaced by a D.C. signal.
GB2900672A 1972-06-21 1972-06-21 Device for measuring the rms value of an electrical signal Expired GB1429929A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2900672A GB1429929A (en) 1972-06-21 1972-06-21 Device for measuring the rms value of an electrical signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2900672A GB1429929A (en) 1972-06-21 1972-06-21 Device for measuring the rms value of an electrical signal

Publications (1)

Publication Number Publication Date
GB1429929A true GB1429929A (en) 1976-03-31

Family

ID=10284750

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2900672A Expired GB1429929A (en) 1972-06-21 1972-06-21 Device for measuring the rms value of an electrical signal

Country Status (1)

Country Link
GB (1) GB1429929A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2239712A (en) * 1990-01-09 1991-07-10 Doble Richard George Vivian High frequency voltage/current-measuring circuit
GB2249637A (en) * 1990-01-09 1992-05-13 Richard George Vivian Doble High frequency voltage/current-measuring circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2239712A (en) * 1990-01-09 1991-07-10 Doble Richard George Vivian High frequency voltage/current-measuring circuit
GB2249637A (en) * 1990-01-09 1992-05-13 Richard George Vivian Doble High frequency voltage/current-measuring circuit
GB2249637B (en) * 1990-01-09 1994-02-16 Richard George Vivian Doble High frequency measuring circuit

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees