GB2019010A - Device for Converting the Variable Formed by an Impedance Transmitter into a Frequency Signal - Google Patents

Device for Converting the Variable Formed by an Impedance Transmitter into a Frequency Signal

Info

Publication number
GB2019010A
GB2019010A GB7911972A GB7911972A GB2019010A GB 2019010 A GB2019010 A GB 2019010A GB 7911972 A GB7911972 A GB 7911972A GB 7911972 A GB7911972 A GB 7911972A GB 2019010 A GB2019010 A GB 2019010A
Authority
GB
United Kingdom
Prior art keywords
impedance transmitter
converting
negator
frequency signal
impedance
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.)
Withdrawn
Application number
GB7911972A
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.)
Mannesmann VDO AG
Original Assignee
Mannesmann VDO AG
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 Mannesmann VDO AG filed Critical Mannesmann VDO AG
Publication of GB2019010A publication Critical patent/GB2019010A/en
Withdrawn legal-status Critical Current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
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/252—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques using analogue/digital converters of the type with conversion of voltage or current into frequency and measuring of this frequency
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant

Abstract

A device for converting the variable formed by an impedance transmitter into a frequency signal has three negators 2, 3, 4 connected in series. The output 6 of the third negator 4, having a frequency which varies approximately inversely with the variations of the impedance transmitter, is fed back to the input of the first negator 2 via a variable resistance 5 forming the impedance transmitter and a fixed resistor 10, and is also fed to one input of a microprocessor 7 generating an output displayed by a display device 9. A fixed capacitance is connected between the junction of the second and third negators and the junction of the two resistors 5, 10. The microprocessor 7 processes the output 6 of the third negator 2 to produce a linear display which is frequency stable. The device may be constructed cheaply using CMOS techniques. Also disclosed are devices using capacitances and inductances as the impedance transmitter. <IMAGE>
GB7911972A 1978-04-17 1979-04-05 Device for Converting the Variable Formed by an Impedance Transmitter into a Frequency Signal Withdrawn GB2019010A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782816655 DE2816655A1 (en) 1978-04-17 1978-04-17 DEVICE FOR CONVERTING THE SIZE OF A RESISTANCE, INDUCTIVE OR CAPACITIVE ENCODER INTO A FREQUENCY

Publications (1)

Publication Number Publication Date
GB2019010A true GB2019010A (en) 1979-10-24

Family

ID=6037211

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7911972A Withdrawn GB2019010A (en) 1978-04-17 1979-04-05 Device for Converting the Variable Formed by an Impedance Transmitter into a Frequency Signal

Country Status (5)

Country Link
JP (1) JPS54139449A (en)
AU (1) AU4554279A (en)
DE (1) DE2816655A1 (en)
FR (1) FR2423788A1 (en)
GB (1) GB2019010A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010076556A3 (en) * 2008-12-31 2010-08-26 Spd Swiss Precision Diagnostics Gmbh A conductivity measurement cell

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2492988A1 (en) * 1980-10-28 1982-04-30 Efcis Digital resistance meter for e.g. temp. measurement - measures count rate of RC oscillator formed with reference and temp. related resistance to calculate ratio of resistances
JPS61253917A (en) * 1985-05-02 1986-11-11 Nippon Denso Co Ltd Semiconductor integrated circuit
DE3642771A1 (en) * 1986-12-15 1988-06-23 Kuipers Ulrich METHOD AND DEVICE FOR MEASURING THE MEASURING SIZE OF A MEASURING OBJECT

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010076556A3 (en) * 2008-12-31 2010-08-26 Spd Swiss Precision Diagnostics Gmbh A conductivity measurement cell
US9689821B2 (en) 2008-12-31 2017-06-27 Spd Swiss Precision Diagnostics Gmbh Conductivity measurement cell

Also Published As

Publication number Publication date
JPS54139449A (en) 1979-10-29
FR2423788B3 (en) 1982-01-22
DE2816655A1 (en) 1979-10-25
FR2423788A1 (en) 1979-11-16
AU4554279A (en) 1979-10-25

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)