JPS57127815A - A-d converter for electronic balance - Google Patents

A-d converter for electronic balance

Info

Publication number
JPS57127815A
JPS57127815A JP56014075A JP1407581A JPS57127815A JP S57127815 A JPS57127815 A JP S57127815A JP 56014075 A JP56014075 A JP 56014075A JP 1407581 A JP1407581 A JP 1407581A JP S57127815 A JPS57127815 A JP S57127815A
Authority
JP
Japan
Prior art keywords
load cell
operational amplifier
amplification circuit
converter
adjustment
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
JP56014075A
Other languages
Japanese (ja)
Inventor
Yoshihisa Nishiyama
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.)
Tokyo Sanyo Electric Co Ltd
Toshiba TEC Corp
Original Assignee
Tokyo Sanyo Electric Co Ltd
Tokyo Electric Co 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 Tokyo Sanyo Electric Co Ltd, Tokyo Electric Co Ltd filed Critical Tokyo Sanyo Electric Co Ltd
Priority to JP56014075A priority Critical patent/JPS57127815A/en
Publication of JPS57127815A publication Critical patent/JPS57127815A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G23/00—Auxiliary devices for weighing apparatus
    • G01G23/18—Indicating devices, e.g. for remote indication; Recording devices; Scales, e.g. graduated
    • G01G23/36—Indicating the weight by electrical means, e.g. using photoelectric cells
    • G01G23/37—Indicating the weight by electrical means, e.g. using photoelectric cells involving digital counting
    • G01G23/3707—Indicating the weight by electrical means, e.g. using photoelectric cells involving digital counting using a microprocessor

Abstract

PURPOSE:To permit zero point adjustment of an amplification circuit without the need of a separate power supply by a converter wherein an operational amplifier receiving partial voltage from a drive power supply for a load cell is connected with an amplification circuit for the load cell thereby to adjust partial voltage output. CONSTITUTION:A fourth operational amplifier is connected between a third operational amplifier which receives signals from first and second operational amplifiers each receiving a weight signal from a load cell and then outputs a difference in both the signals after amplification and a circuit which serves to divide voltage from a load cell driving power supply and can adjust the partial voltage, so that zero adjustment of the amplification circuit becomes adjustable. Further, an A-D converter is used to digitalize the signal. For example, output from a load cell 31 is fed to operational amplifiers 42 and 43 and a difference in outputs therefrom is amplified by an operational amplifier 44. Zero adjustment of the amplification circuit is performed by a voltage dividing circuit 75 which comprises resistors 72, 73, 74 connected between A and B and a zero adjuster which comprises an operational amplifier 76 through adjustment of resistance values thereof.
JP56014075A 1981-02-02 1981-02-02 A-d converter for electronic balance Pending JPS57127815A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56014075A JPS57127815A (en) 1981-02-02 1981-02-02 A-d converter for electronic balance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56014075A JPS57127815A (en) 1981-02-02 1981-02-02 A-d converter for electronic balance

Publications (1)

Publication Number Publication Date
JPS57127815A true JPS57127815A (en) 1982-08-09

Family

ID=11850979

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56014075A Pending JPS57127815A (en) 1981-02-02 1981-02-02 A-d converter for electronic balance

Country Status (1)

Country Link
JP (1) JPS57127815A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6013414U (en) * 1983-07-06 1985-01-29 株式会社山武 Analog quantity measurement circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4843668A (en) * 1971-09-30 1973-06-23 Reliance Electric Co

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4843668A (en) * 1971-09-30 1973-06-23 Reliance Electric Co

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6013414U (en) * 1983-07-06 1985-01-29 株式会社山武 Analog quantity measurement circuit

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