JPS5728266A - Digital ammeter - Google Patents

Digital ammeter

Info

Publication number
JPS5728266A
JPS5728266A JP10249980A JP10249980A JPS5728266A JP S5728266 A JPS5728266 A JP S5728266A JP 10249980 A JP10249980 A JP 10249980A JP 10249980 A JP10249980 A JP 10249980A JP S5728266 A JPS5728266 A JP S5728266A
Authority
JP
Japan
Prior art keywords
term
voltage
sensing resistor
compensating circuit
current
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.)
Pending
Application number
JP10249980A
Other languages
Japanese (ja)
Inventor
Kiyomichi Kubota
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP10249980A priority Critical patent/JPS5728266A/en
Publication of JPS5728266A publication Critical patent/JPS5728266A/en
Pending 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

PURPOSE:to enable highly accurate measurement to be always performed without mutual interference even though a current sensing resistor having poor performance is used, by connecting a resistace compensating circuit between the current sensing resistor and an A-D cnverter. CONSTITUTION:A measured current I which is sent from a current source 2 to be measured is converted to an analog voltage Vs=RsI by the sensing resistor 3. Said voltage Vs is further converted to an analog voltage V0=Rb.Rg.Rs.I/(Ra. Rf)-(Rg.Vz/Re)+Voff by the resistance compensating circuit 8. In this equation, the first term is span adjusting term by which the resistace Rs of the resistor 3 is equivalently increased or decreased, and the second term is the zero adjusting term for the offset voltage V0ff in the third term for antiphase operational amplifiers 9 and 10. The outout voltage V0 from the compensating circuit 8 is displayed on a display 7 via the A-D converter 4, a code cnverter 5, and a driver 6. In this constitution, even though the sensing the sensing resistor, whose accuracy is poor and the resistance value is low, is used, its value, which is low, is equivalently compensated to the highly accurate value.
JP10249980A 1980-07-28 1980-07-28 Digital ammeter Pending JPS5728266A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10249980A JPS5728266A (en) 1980-07-28 1980-07-28 Digital ammeter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10249980A JPS5728266A (en) 1980-07-28 1980-07-28 Digital ammeter

Publications (1)

Publication Number Publication Date
JPS5728266A true JPS5728266A (en) 1982-02-15

Family

ID=14329095

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10249980A Pending JPS5728266A (en) 1980-07-28 1980-07-28 Digital ammeter

Country Status (1)

Country Link
JP (1) JPS5728266A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0496597A (en) * 1990-08-14 1992-03-27 Fujitsu Ltd Two/four wire conversion circuit
RU2610221C2 (en) * 2011-06-30 2017-02-08 МЭППЕР ЛИТОГРАФИ АйПи Б.В. Input electric current measurement system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0496597A (en) * 1990-08-14 1992-03-27 Fujitsu Ltd Two/four wire conversion circuit
RU2610221C2 (en) * 2011-06-30 2017-02-08 МЭППЕР ЛИТОГРАФИ АйПи Б.В. Input electric current measurement system
US9644995B2 (en) 2011-06-30 2017-05-09 Mapper Lithography Ip B.V. Current measurement system
USRE48901E1 (en) 2011-06-30 2022-01-25 Asml Netherlands B.V. Current measurement system

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