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GB913789A - Electronic means for the measurement of small direct currents - Google Patents

Electronic means for the measurement of small direct currents

Info

Publication number
GB913789A
GB913789A GB4477460A GB4477460A GB913789A GB 913789 A GB913789 A GB 913789A GB 4477460 A GB4477460 A GB 4477460A GB 4477460 A GB4477460 A GB 4477460A GB 913789 A GB913789 A GB 913789A
Authority
GB
United Kingdom
Prior art keywords
current
voltage
amplifier
capacitance
integration
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
GB4477460A
Inventor
Gerd Schubert
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.)
Vakutronik VEB
Original Assignee
Vakutronik VEB
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 Vakutronik VEB filed Critical Vakutronik VEB
Priority to GB4477460A priority Critical patent/GB913789A/en
Publication of GB913789A publication Critical patent/GB913789A/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
    • G01R19/12—Measuring rate of change
    • 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)
  • Measurement Of Current Or Voltage (AREA)

Abstract

913,789. Voltage and current measurements. VAKUTRONIK VEB. Dec. 30, 1960, No. 44774/60. Class 37. A direct current measuring device (Fig. 1) comprises a direct voltage amplifier 6 to the input of which is supplied a measurement current i 1 and a negative feed-back current i 2 derived over capacitance 1 from a voltage u 3 developed across a resistance capacitance integration circuit 2, 3 shunting the output of the amplifier, whose voltage u 2 operates instrument 5 indicating the input current i 1 to which the feed-back current i 2 is maintained almost equal to develop a small input voltage u 1 at the amplifier. Manually or automatically operated switches 4, 7 discharge the integration and feedback capacitances at the conclusion of measurements or after a measurement time interval at which the integration condition u 3 <<u 2 is no longer fulfilled. In modifications (Figs. 2, 3, not shown) the amplifier output current flows through a meter and a series resistance across which the integrating circuit is connected, or the integrating circuit is energized from a voltage divider shunted across the amplifier output as a sensitivity adjustment. Capacitance 1 may be continuously or switchably variable.
GB4477460A 1960-12-30 1960-12-30 Electronic means for the measurement of small direct currents Expired GB913789A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4477460A GB913789A (en) 1960-12-30 1960-12-30 Electronic means for the measurement of small direct currents

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4477460A GB913789A (en) 1960-12-30 1960-12-30 Electronic means for the measurement of small direct currents

Publications (1)

Publication Number Publication Date
GB913789A true GB913789A (en) 1962-12-28

Family

ID=10434681

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4477460A Expired GB913789A (en) 1960-12-30 1960-12-30 Electronic means for the measurement of small direct currents

Country Status (1)

Country Link
GB (1) GB913789A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003065058A1 (en) * 2002-02-01 2003-08-07 Infineon Technologies Ag Circuit arrangement, redox recycling sensor, sensor assembly and a method for processing a current signal provided by a sensor electrode

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003065058A1 (en) * 2002-02-01 2003-08-07 Infineon Technologies Ag Circuit arrangement, redox recycling sensor, sensor assembly and a method for processing a current signal provided by a sensor electrode

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