FR2363113A1 - Sensitive AC bridge for instrumentation - has square wave fed to resistance bridge and phase detector sensing balance - Google Patents

Sensitive AC bridge for instrumentation - has square wave fed to resistance bridge and phase detector sensing balance

Info

Publication number
FR2363113A1
FR2363113A1 FR7724612A FR7724612A FR2363113A1 FR 2363113 A1 FR2363113 A1 FR 2363113A1 FR 7724612 A FR7724612 A FR 7724612A FR 7724612 A FR7724612 A FR 7724612A FR 2363113 A1 FR2363113 A1 FR 2363113A1
Authority
FR
France
Prior art keywords
bridge
sensitive
instrumentation
square wave
phase detector
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.)
Granted
Application number
FR7724612A
Other languages
French (fr)
Other versions
FR2363113B3 (en
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of FR2363113A1 publication Critical patent/FR2363113A1/en
Application granted granted Critical
Publication of FR2363113B3 publication Critical patent/FR2363113B3/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
    • G01R17/10—AC or DC measuring bridges
    • G01R17/105—AC or DC measuring bridges for measuring impedance or resistance

Abstract

The sensitive, low resistance AC bridge for instrumentation purposes comprises a four-resistor network containing at least one variable arm. The usual DC source is replaced by a square-wave generator (2) operating at around 1 kHz, constant amplitude. The bridge diagonal is connected to the primary of a 1:25 transformer which raises the signal level to well above the noise level of the following amplifier (6) which is a simple AC amplifier. The secondary of the transformer is taken, via the amplifier, to a phase-sensitive detector (7) controlled from the AC generator. The detector's output signal is proportional to the bridge signal. Where a differential type of measurement is required, two such bridges may be used in conjunction with a differential transformer.
FR7724612A 1976-08-26 1977-08-10 LOW IMPEDANCE RESISTANCE BRIDGE MOUNTING Expired FR2363113B3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762638546 DE2638546A1 (en) 1976-08-26 1976-08-26 CIRCUIT ARRANGEMENT WITH A LOW RESISTANCE MEASURING BRIDGE

Publications (2)

Publication Number Publication Date
FR2363113A1 true FR2363113A1 (en) 1978-03-24
FR2363113B3 FR2363113B3 (en) 1980-07-11

Family

ID=5986467

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7724612A Expired FR2363113B3 (en) 1976-08-26 1977-08-10 LOW IMPEDANCE RESISTANCE BRIDGE MOUNTING

Country Status (3)

Country Link
DE (1) DE2638546A1 (en)
FR (1) FR2363113B3 (en)
IT (1) IT1084513B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2463415A1 (en) * 1979-08-10 1981-02-20 Marchal Equipements Automobile Capacitive bridge measurement circuit - has square wave bridge supply and diode voltage reference providing temp. compensation
DE4114592A1 (en) * 1991-05-03 1992-11-05 Licentia Gmbh Photodetector arrangement with current=carrying detector element in bridge - uses frequency modulation of bridge operating voltage and corresp. frequency selective evaluation of diagonal voltage
DE4114489A1 (en) * 1991-05-03 1992-11-05 Licentia Gmbh Photodetector arrangement with current carrying element - uses frequency selective evaluation of detector voltage with modulation of detector current
FR2731070B1 (en) * 1995-02-28 1997-04-04 Commissariat Energie Atomique POSITION MEASUREMENT DEVICE BY POTENTIOMETRIC SENSORS

Also Published As

Publication number Publication date
FR2363113B3 (en) 1980-07-11
IT1084513B (en) 1985-05-25
DE2638546A1 (en) 1978-03-02

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Legal Events

Date Code Title Description
ST Notification of lapse