JPS5730958A - Current measuring device - Google Patents

Current measuring device

Info

Publication number
JPS5730958A
JPS5730958A JP10594180A JP10594180A JPS5730958A JP S5730958 A JPS5730958 A JP S5730958A JP 10594180 A JP10594180 A JP 10594180A JP 10594180 A JP10594180 A JP 10594180A JP S5730958 A JPS5730958 A JP S5730958A
Authority
JP
Japan
Prior art keywords
current
load resistance
switches
measurement
measurement 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
JP10594180A
Other languages
Japanese (ja)
Inventor
Toshiyuki Miyake
Shozo Yano
Akira Kawamoto
Yasuhiro Fujinaga
Norio Kawahara
Toshihiro Tsuji
Tadashi Nagaoka
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.)
Shimadzu Corp
Original Assignee
Shimadzu Corp
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 Shimadzu Corp filed Critical Shimadzu Corp
Priority to JP10594180A priority Critical patent/JPS5730958A/en
Publication of JPS5730958A publication Critical patent/JPS5730958A/en
Pending 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
    • G01R17/02—Arrangements in which the value to be measured is automatically compared with a reference value
    • G01R17/06—Automatic balancing arrangements

Landscapes

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

Abstract

PURPOSE:To eliminate an influence of a change in a resistance value of a load resistance due to a self-heating phenomenon, created by a current, and an ambient temperature, by a method wherein a measurement current and a reference current are alternately applied in a time-division manner to a common load resistance. CONSTITUTION:With switches 10, 7b opened and a switch 7a closed, a measurement current 1 flows to a load resistance 2, and voltages at the opposite ends of the resistor 2 are integrated for a given period of time by means of integrating circuits 4, 5, and 6. Then, with switches 7a, 8b opened and switches 7b, 8a closed, a reference current 9 flows to a load resistance 2 in the reverse direction to that of the measurement current, and voltage, having an inverse polarity, at the opposite ends of the resistor 2 are integrated. A sequence circuit 13 opens a gate circuit 15 for a period until an output of an operational amplifier 4 is brought into a null position. A clock pulse from a pulse generator 14, passing through the gate circuit 15, is counted to measure a measurement current. This prevents the production of a change in an indication value resulting from the exertion of the influence of self- heating, and enables to perform a rapid and stable measurement.
JP10594180A 1980-07-31 1980-07-31 Current measuring device Pending JPS5730958A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10594180A JPS5730958A (en) 1980-07-31 1980-07-31 Current measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10594180A JPS5730958A (en) 1980-07-31 1980-07-31 Current measuring device

Publications (1)

Publication Number Publication Date
JPS5730958A true JPS5730958A (en) 1982-02-19

Family

ID=14420866

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10594180A Pending JPS5730958A (en) 1980-07-31 1980-07-31 Current measuring device

Country Status (1)

Country Link
JP (1) JPS5730958A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0930802A3 (en) * 1997-12-19 2007-04-18 Texas Instruments Inc. Microphone bias current measurement circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53106557A (en) * 1977-02-28 1978-09-16 Takeda Riken Ind Co Ltd Integral ad converter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53106557A (en) * 1977-02-28 1978-09-16 Takeda Riken Ind Co Ltd Integral ad converter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0930802A3 (en) * 1997-12-19 2007-04-18 Texas Instruments Inc. Microphone bias current measurement circuit

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