JPS5719673A - Electric current detector with resistance change-over circuit - Google Patents

Electric current detector with resistance change-over circuit

Info

Publication number
JPS5719673A
JPS5719673A JP9428880A JP9428880A JPS5719673A JP S5719673 A JPS5719673 A JP S5719673A JP 9428880 A JP9428880 A JP 9428880A JP 9428880 A JP9428880 A JP 9428880A JP S5719673 A JPS5719673 A JP S5719673A
Authority
JP
Japan
Prior art keywords
terminal
voltage
switch
resistance change
amplifier
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
JP9428880A
Other languages
Japanese (ja)
Other versions
JPS648310B2 (en
Inventor
Koichi Maeda
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.)
Hewlett Packard Japan Inc
Original Assignee
Yokogawa Hewlett Packard 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 Yokogawa Hewlett Packard Ltd filed Critical Yokogawa Hewlett Packard Ltd
Priority to JP9428880A priority Critical patent/JPS5719673A/en
Publication of JPS5719673A publication Critical patent/JPS5719673A/en
Publication of JPS648310B2 publication Critical patent/JPS648310B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/08—Circuits for altering the measuring range

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Individual Semiconductor Devices (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

PURPOSE:To suppress spike noise at current detecting resistance change-over by a method wherein a semiconductor switch and a series circuit of resistances are connected between the output terminal of an amplifier a load circuit and further, a saw- tooth wave signal generator is connected to a control input of said switch. CONSTITUTION:A semiconductor switch 25 such as a junction type FET is connected in series to a resister 7, and to an FET gate of this switch a terminal of one side of a saw-tooth wave signal generator 27 is connected and the other terminal of the generator 27 is connected to a common terminal (s) of a change-over switch 29. This common terminal (s) is permitted to be connected selectively to a contact point a connected to an output terminal of an amplifier 3, a contact point (b) connected to an output terminal of a voltage follower 11 or a contact point C connected to a reference potential point. Further, the voltage produced at a load circuit 15 is negatively fedbacked through the voltage foloower 11, to the input of the amplifier 3 and at a terminal 13, constant voltage in correspondence to an input voltage is produced. Through such a configuration, the spike noise to be produced at the time of resistance change over can be suppressed, thereby enabling proper selection of switching over time to be at a desired value.
JP9428880A 1980-07-10 1980-07-10 Electric current detector with resistance change-over circuit Granted JPS5719673A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9428880A JPS5719673A (en) 1980-07-10 1980-07-10 Electric current detector with resistance change-over circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9428880A JPS5719673A (en) 1980-07-10 1980-07-10 Electric current detector with resistance change-over circuit

Publications (2)

Publication Number Publication Date
JPS5719673A true JPS5719673A (en) 1982-02-01
JPS648310B2 JPS648310B2 (en) 1989-02-13

Family

ID=14106066

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9428880A Granted JPS5719673A (en) 1980-07-10 1980-07-10 Electric current detector with resistance change-over circuit

Country Status (1)

Country Link
JP (1) JPS5719673A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61169770A (en) * 1985-01-23 1986-07-31 Chuo Riken:Kk Power source circuit for tester
JPH0317581U (en) * 1989-06-30 1991-02-21

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61169770A (en) * 1985-01-23 1986-07-31 Chuo Riken:Kk Power source circuit for tester
JPH0317581U (en) * 1989-06-30 1991-02-21

Also Published As

Publication number Publication date
JPS648310B2 (en) 1989-02-13

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