JP2000304629A - Strain gauge adjusting device - Google Patents
Strain gauge adjusting deviceInfo
- Publication number
- JP2000304629A JP2000304629A JP11445299A JP11445299A JP2000304629A JP 2000304629 A JP2000304629 A JP 2000304629A JP 11445299 A JP11445299 A JP 11445299A JP 11445299 A JP11445299 A JP 11445299A JP 2000304629 A JP2000304629 A JP 2000304629A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- strain gauge
- output voltage
- adjusting
- unit
- 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
Links
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、歪みゲージからの
微小電圧を増幅・調整する歪みゲージ調整装置に関する
ものである。[0001] 1. Field of the Invention [0002] The present invention relates to a strain gauge adjusting device for amplifying and adjusting a minute voltage from a strain gauge.
【０００２】[0002]
【従来の技術】従来、歪みゲージからの微小電圧を増幅
・調整する歪みゲージ調整装置は、ポテンショメータを
用いた零点調整部や増幅度調整部より構成することが一
般的に知られている。その実施例としては図２に示すよ
うなポテンショメータを用いた歪みゲージ調整装置があ
る。2. Description of the Related Art Conventionally, it is generally known that a strain gauge adjusting device for amplifying and adjusting a minute voltage from a strain gauge comprises a zero point adjusting unit using a potentiometer and an amplification degree adjusting unit. As an example, there is a strain gauge adjusting device using a potentiometer as shown in FIG.
【０００３】この装置は歪みゲージからの出力信号を差
動増幅する差動増幅部１０と、この差動増幅部１０で得
られた電圧を零点調整するための零点設定部３０、加減
算部２０と、この結果を増幅・調整する増幅度設定部４
０と、増幅・調整した出力電圧をデジタル値に変換する
Ａ／Ｄ変換部５０から構成されている。This device includes a differential amplifying unit 10 for differentially amplifying an output signal from a strain gauge, a zero point setting unit 30 for zero-adjusting a voltage obtained by the differential amplifying unit 10, and an addition / subtraction unit 20. Amplification degree setting unit 4 for amplifying and adjusting the result
It comprises an A / D converter 50 for converting the output voltage, which has been amplified and adjusted, to a digital value.
【０００４】[0004]
【発明が解決しようとする課題】ロードセルでブリッジ
構成された歪みゲージからの出力電圧は一般的には数ミ
リボルトしかないうえに、オフセットとスパンが歪みゲ
ージ個々によって大きくばらつくき、このため大きく且
つ微妙にオフセットを調整する零点調整やスパンを調整
する増幅度調整は多回転型のポテンショメータで行われ
ることになる。The output voltage from a strain gage bridged with load cells is typically only a few millivolts, and offsets and spans vary widely from strain gage to strain gage. Zero adjustment for adjusting the offset and amplification adjustment for adjusting the span are performed by a multi-rotation potentiometer.
【０００５】しかしながら、多回転型ポテンショメータ
の調整は生産性にすぐれているとはいえず、また最初の
零点調整に誤差が発生すると増幅度調整後に零点が変動
し、零点調整と増幅度調整を２〜３度繰り返すことが必
要になるほど微妙であり、作業性を悪化させていた。However, the adjustment of the multi-rotation potentiometer is not considered to be excellent in productivity, and when an error occurs in the initial zero adjustment, the zero point fluctuates after the amplification adjustment, and the zero adjustment and the amplification adjustment are performed by two times. It was delicate enough to need to be repeated up to three times, and the workability was deteriorated.
【０００６】したがって、歪みゲージ調整装置の機能を
有する製品では、容易に零点調整・増幅度調整が出来な
いという課題があった。Therefore, a product having the function of a strain gauge adjusting device has a problem that zero point adjustment and amplification degree adjustment cannot be easily performed.
【０００７】本発明はこのような従来の課題を解決し、
ポテンショメータを用いることなく容易に零点調整・増
幅度調整ができる歪みゲージ調整装置を提供することを
目的とするものである。The present invention solves such a conventional problem,
It is an object of the present invention to provide a strain gauge adjustment device capable of easily adjusting a zero point and an amplification degree without using a potentiometer.
【０００８】[0008]
【課題を解決するための手段】この課題を解決するため
に本発明は、歪みゲージの出力電圧を差動増幅する差動
増幅部と、この差動増幅部の出力電圧と第１の所定電圧
を加減算する加減算部と、第２の所定電圧を設定する零
点設定部と、演算増幅器を用いた非反転増幅回路の増幅
度が外部信号により設定でき且つ前記零点設定部で設定
した第２の所定電圧を基準に前記加減算部の出力電圧を
増幅する増幅度設定部と、この増幅度設定部の出力電圧
か前記零点設定部で設定した第２の所定電圧かを選択で
きる電圧選択部と、この電圧選択部の出力電圧をデジタ
ル値に変換するＡ／Ｄ変換部と、所定のデジタル値を電
圧に変換し且つこの電圧が前記第１の所定電圧を生成す
るＤ／Ａ変換部との構成を有するものである。この本発
明によれば、ポテンショメータを用いることなく容易に
零点調整・増幅度調整ができる歪みゲージ調整装置が得
られる。According to the present invention, there is provided a differential amplifier for differentially amplifying an output voltage of a strain gauge, an output voltage of the differential amplifier and a first predetermined voltage. An addition / subtraction unit for adding / subtracting a second predetermined voltage, a zero point setting unit for setting a second predetermined voltage, and a second predetermined level set by the zero point setting unit, wherein the amplification degree of the non-inverting amplifier circuit using the operational amplifier can be set by an external signal. An amplification degree setting section for amplifying an output voltage of the addition / subtraction section based on a voltage; a voltage selection section for selecting between the output voltage of the amplification degree setting section and the second predetermined voltage set by the zero point setting section; An A / D converter for converting the output voltage of the voltage selector to a digital value, and a D / A converter for converting a predetermined digital value to a voltage and generating the first predetermined voltage based on the voltage. Have According to the present invention, it is possible to obtain a strain gauge adjustment device capable of easily adjusting the zero point and the amplification degree without using a potentiometer.
【０００９】[0009]
【発明の実施の形態】本発明の請求項１に記載の発明
は、歪みゲージの出力電圧を差動増幅する差動増幅部
と、この差動増幅部の出力電圧と第１の所定電圧を加減
する加減算部と、第２の所定電圧を設定する零点設定部
と、演算増幅器を用いた非反転増幅回路の増幅度が外部
信号により設定でき且つ前記零点設定部で設定した第２
の所定電圧を基準に前記加減算部の出力電圧を増幅する
増幅度設定部と、この増幅度設定部の出力電圧か前記零
点設定部で設定した第２の所定電圧かを選択できる電圧
選択部と、この電圧選択部の出力電圧をデジタル値に変
換するＡ／Ｄ変換部と、所定のデジタル値を電圧に変換
し且つこの電圧が前記第１の所定電圧を生成するＤ／Ａ
変換部との構成を有した歪みゲージ調整装置なので、ポ
テンショメータを用いることなく個々にばらつく歪みゲ
ージのオフセットとスパンを容易に調整できるという作
用を有する。DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a differential amplifier for differentially amplifying an output voltage of a strain gauge, and an output voltage of the differential amplifier and a first predetermined voltage are provided. An adding / subtracting unit for adding and subtracting, a zero point setting unit for setting a second predetermined voltage, and a second degree set by the zero point setting unit.
An amplification setting unit that amplifies the output voltage of the addition / subtraction unit based on the predetermined voltage, and a voltage selection unit that can select the output voltage of the amplification setting unit or the second predetermined voltage set by the zero point setting unit. An A / D converter for converting the output voltage of the voltage selector to a digital value, and a D / A for converting a predetermined digital value to a voltage and generating the first predetermined voltage.
Since it is a strain gauge adjustment device having a configuration with a conversion unit, it has an effect that offsets and spans of strain gauges that vary individually can be easily adjusted without using a potentiometer.
【００１０】以下、本発明の実施の形態について、図１
を用いて説明する。Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.
【００１１】（実施の形態１）図１は本発明の第１の実
施の形態における歪みゲージ調整装置の構成図であり、
図１において１は差動増幅部、２は加減算部、３は零点
設定部、４は増幅度設定部、５はＡ／Ｄ変換部、６はＤ
／Ａ変換部、７は電圧選択部を示している。(Embodiment 1) FIG. 1 is a configuration diagram of a strain gauge adjusting apparatus according to a first embodiment of the present invention.
In FIG. 1, 1 is a differential amplifier, 2 is an adder / subtractor, 3 is a zero setting unit, 4 is an amplification setting unit, 5 is an A / D converter, and 6 is D / D converter.
The / A converter 7 indicates a voltage selector.
【００１２】以下、この歪みゲージ調整装置の動作につ
いて同図を用いて説明する。歪みゲージからの信号は通
常数ミリボルトであり、この電圧をＶｓとする。Hereinafter, the operation of the strain gauge adjusting device will be described with reference to FIG. The signal from the strain gauge is usually several millivolts, and this voltage is Vs.
【００１３】差動増幅部の増幅度がαのとき差動増幅部
出力電圧Ｖａは、 Ｖａ＝α・Ｖｓ となり、Ｄ／Ａ変換部の出力電圧をＶｂとすると加減算
部の出力Ｖｃは、 Ｖｃ＝Ｖａ＋Ｖｂ ＝α・Ｖｓ＋Ｖｂ となる。増幅度設定部でＲ２が選択されていると、増幅
度設定部の出力Ｖｄは、 Ｖｄ＝（１＋Ｒ２／Ｒ１）・Ｖｃ−（Ｒ２／Ｒ１）・Ｖｚ ここで（１＋Ｒ２／Ｒ１）＝βとおくと、 ＝β・（Ｖｃ−Ｖｚ）＋Ｖｚ ＝β・（α・Ｖｓ＋Ｖｂ−Ｖｚ）＋Ｖｚ … を得る。但しＶｚは零点設定部で設定した電圧である。When the amplification degree of the differential amplifier is α, the output voltage Va of the differential amplifier becomes Va = α · Vs. When the output voltage of the D / A converter is Vb, the output Vc of the adder / subtractor becomes Vc = Va + Vb = α · Vs + Vb. If R2 is selected in the amplification degree setting section, the output Vd of the amplification degree setting section is as follows: Vd = (1 + R2 / R1) · Vc− (R2 / R1) · Vz (1 + R2 / R1) = β = Β · (Vc−Vz) + Vz = β · (α · Vs + Vb−Vz) + Vz. Here, Vz is a voltage set by the zero point setting unit.
【００１４】今、歪みゲージがオフセット状態にあると
し、このときの歪みゲージ出力電圧Ｖｓ＝Ｖｓｏとす
る。このオフセット状態でＶｄ＝Ｖｚとするには、式
より Ｖｚ＝β・（α・Ｖｓｏ＋Ｖｂ−Ｖｚ）＋Ｖｚ となり、 Ｖｂ＝Ｖｚ−α・Ｖｓｏ を得る。Now, it is assumed that the strain gauge is in an offset state, and the strain gauge output voltage Vs at this time is Vs = Vso. In order to make Vd = Vz in this offset state, Vz = β · (α · Vso + Vb−Vz) + Vz is obtained from the equation, and Vb = Vz−α · Vso is obtained.
【００１５】以上より、歪みゲージがオフセット状態に
あるとき、Ｄ／Ａ変換部からの出力電圧Ｖｂを（Ｖｚ−
α・Ｖｓｏ）に設定すればよいことになる。そして本発
明の歪みゲージ調整装置の構成によれば、ＶｚをＡ／Ｄ
変換部より取り込めるので容易にＶｂを調整できる。す
なわち歪みゲージがオフセット状態にあるとき、電圧選
択部で選択できる２つの電圧が等しくなるようにＶｂを
変えるだけでよい。As described above, when the strain gauge is in the offset state, the output voltage Vb from the D / A converter is changed to (Vz-
α · Vso). According to the configuration of the strain gauge adjusting device of the present invention, Vz is set to A / D
Vb can be easily adjusted because it can be taken in from the converter. That is, when the strain gauge is in the offset state, it is only necessary to change Vb so that the two voltages selectable by the voltage selector become equal.
【００１６】この求めたＶｂを式に代入すると、 Ｖｄ＝α・β・（Ｖｓ−Ｖｓｏ）＋Ｖｚ となる。When the obtained Vb is substituted into the equation, Vd = α · β · (Vs−Vso) + Vz.
【００１７】歪みゲージのスパン調整は、歪みゲージを
最大スパンとなる状態にしＶｄ値が最も大きく且つＡ／
Ｄ変換上限を超えないような値となるβを設定するだけ
でよい。To adjust the span of the strain gauge, the strain gauge is set to the maximum span, the Vd value is the largest, and A / A
It is only necessary to set a value β that does not exceed the D conversion upper limit.
【００１８】具体的な値として例をあげると、オフセッ
ト電圧Ｖｓｏ＝−２ｍＶ、スパン電圧（Ｖｓ−Ｖｓｏ）
＝４ｍＶの特性を持つ歪みゲージを０．３〜４．３Ｖに
調整するためには例えばα＝５００、β＝２とし、Ｖｚ
＝０．３Ｖ、Ｖｂ＝＋１．３Ｖといった値にすればよい
ことになる。For example, as specific values, offset voltage Vso = -2 mV, span voltage (Vs-Vso)
In order to adjust a strain gauge having a characteristic of = 4 mV to 0.3 to 4.3 V, for example, α = 500, β = 2, and Vz
= 0.3V, Vb = + 1.3V.
【００１９】以上のように同実施の形態１によれば、ポ
テンショメータを用いることなく個々にばらつく歪みゲ
ージのオフセット・スパンを容易に調整できるという効
果が得られる。As described above, according to the first embodiment, it is possible to easily adjust the offset span of the strain gauge that varies individually without using a potentiometer.
【００２０】[0020]
【発明の効果】以上のように本発明による歪みゲージ調
整装置は、歪みゲージの出力電圧を差動増幅する差動増
幅部と、この差動増幅部の出力電圧と第１の所定電圧を
加減算する加減算部と、第２の所定電圧を設定する零点
設定部と、演算増幅器を用いた非反転増幅回路の増幅度
が外部信号により設定でき且つ前記零点設定部で設定し
た第２の所定電圧を基準に前記加減算部の出力電圧を増
幅する増幅度設定部と、この増幅度設定部の出力電圧か
前記零点設定部で設定した第２の所定電圧かを選択でき
る電圧選択部と、この電圧選択部の出力電圧をデジタル
値に変換するＡ／Ｄ変換部と、所定のデジタル値を電圧
に変換し且つこの電圧が前記第１の所定電圧を生成する
Ｄ／Ａ変換部との構成を有しているので、ポテンショメ
ータを用いることなく個々にばらつく歪みゲージのオフ
セットを調整する零点調整やスパンを調整する増幅度調
整が容易にでき、生産性が向上するという有利な効果が
得られる。As described above, the strain gauge adjusting apparatus according to the present invention comprises a differential amplifier for differentially amplifying the output voltage of the strain gauge, and adding / subtracting the output voltage of the differential amplifier and the first predetermined voltage. Adding / subtracting unit, a zero-point setting unit for setting a second predetermined voltage, and a second predetermined voltage set by the zero-point setting unit, wherein the amplification of the non-inverting amplifier circuit using the operational amplifier can be set by an external signal. An amplification setting section for amplifying the output voltage of the addition / subtraction section as a reference; a voltage selection section capable of selecting either the output voltage of the amplification setting section or the second predetermined voltage set by the zero point setting section; An A / D converter that converts an output voltage of the unit into a digital value; and a D / A converter that converts a predetermined digital value into a voltage and generates the first predetermined voltage. Use a potentiometer Ku can amplification degree is easily adjusted by adjusting the zero point adjustment and a span of adjusting the offset of the strain gauges varies individually, the advantageous effect of improving the productivity are obtained.
【図１】本発明の第１の実施の形態における歪みゲージ
調整装置の構成図FIG. 1 is a configuration diagram of a strain gauge adjustment device according to a first embodiment of the present invention.
【図２】従来の歪みゲージ調整装置の構成図FIG. 2 is a configuration diagram of a conventional strain gauge adjustment device.
１ 差動増幅部 ２ 加減算部 ３ 零点設定部 ４ 増幅度設定部 ５ Ａ／Ｄ変換部 ６ Ｄ／Ａ変換部 ７ 電圧選択部 １０ 差動増幅部 ２０ 加減算部 ３０ 零点設定部 ４０ 増幅度設定部 ５０ Ａ／Ｄ変換部 DESCRIPTION OF SYMBOLS 1 Differential amplification part 2 Addition and subtraction part 3 Zero point setting part 4 Amplification degree setting part 5 A / D conversion part 6 D / A conversion part 7 Voltage selection part 10 Differential amplification part 20 Addition and subtraction part 30 Zero point setting part 40 Amplification degree setting part 50 A / D converter
───────────────────────────────────────────────────── フロントページの続き (72)発明者 今田 博 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 Ｆターム(参考） 2F063 AA25 CA40 CB03 CB08 CC10 DA05 EC00 LA00 5J022 AA01 AB01 BA01 CB06 CC01 CF02 CF07 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroshi Imada 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (reference) 2F063 AA25 CA40 CB03 CB08 CC10 DA05 EC00 LA00 5J022 AA01 AB01 BA01 CB06 CC01 CF02 CF07
Claims (1)
動増幅部と、この差動増幅部の出力電圧と第１の所定電
圧を加減算する加減算部と、第２の所定電圧を設定する
零点設定部と、演算増幅器を用いた非反転増幅回路の増
幅度が外部信号により設定でき且つ前記零点設定部で設
定した第２の所定電圧を基準に前記加減算部の出力電圧
を増幅する増幅度設定部と、この増幅度設定部の出力電
圧か前記零点設定部で設定した第２の所定電圧かを選択
できる電圧選択部と、この電圧選択部の出力電圧をデジ
タル値に変換するアナログ・デジタル変換部と、所定の
デジタル値を電圧に変換し且つこの電圧が前記第１の所
定電圧を生成するデジタル・アナログ変換部との構成を
有する歪みゲージ調整装置。1. A differential amplifier for differentially amplifying an output voltage of a strain gauge, an adder / subtractor for adding / subtracting an output voltage of the differential amplifier and a first predetermined voltage, and a second predetermined voltage are set. A zero-point setting unit, and an amplification degree which can set an amplification degree of a non-inverting amplifier circuit using an operational amplifier by an external signal and amplify an output voltage of the addition / subtraction unit based on a second predetermined voltage set by the zero-point setting unit. A setting unit, a voltage selection unit that can select the output voltage of the amplification degree setting unit or the second predetermined voltage set by the zero point setting unit, and an analog / digital converter that converts the output voltage of the voltage selection unit into a digital value A strain gauge adjustment device having a configuration of a conversion unit and a digital / analog conversion unit that converts a predetermined digital value into a voltage and generates the first predetermined voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11445299A JP2000304629A (en) | 1999-04-22 | 1999-04-22 | Strain gauge adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11445299A JP2000304629A (en) | 1999-04-22 | 1999-04-22 | Strain gauge adjusting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000304629A true JP2000304629A (en) | 2000-11-02 |
Family
ID=14638095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11445299A Pending JP2000304629A (en) | 1999-04-22 | 1999-04-22 | Strain gauge adjusting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000304629A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006313096A (en) * | 2005-05-06 | 2006-11-16 | Tanita Corp | Digital gravimeter |
| CN102087119A (en) * | 2010-03-18 | 2011-06-08 | 上海海事大学 | Remote zero setting circuit and method for resistance-type strain measurement |
| KR101059381B1 (en) | 2009-08-19 | 2011-08-25 | 김지홍 | Analog signal compensator to adjust zero and span |
| KR101128500B1 (en) * | 2009-08-19 | 2012-03-27 | 김지홍 | Measuring device for strain gage |
-
1999
- 1999-04-22 JP JP11445299A patent/JP2000304629A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006313096A (en) * | 2005-05-06 | 2006-11-16 | Tanita Corp | Digital gravimeter |
| KR101059381B1 (en) | 2009-08-19 | 2011-08-25 | 김지홍 | Analog signal compensator to adjust zero and span |
| KR101128500B1 (en) * | 2009-08-19 | 2012-03-27 | 김지홍 | Measuring device for strain gage |
| CN102087119A (en) * | 2010-03-18 | 2011-06-08 | 上海海事大学 | Remote zero setting circuit and method for resistance-type strain measurement |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH09329460A (en) | Monolithic integrated sensor circuit | |
| JP2928526B2 (en) | POWER SUPPLY CIRCUIT AND BRIDGE TYPE MEASUREMENT OUTPUT COMPENSATION CIRCUIT COMPRISING THE CIRCUIT | |
| GB2060184A (en) | Displacement transducer | |
| US5532582A (en) | Analog input apparatus | |
| JP2543177B2 (en) | Clamping device and automatic gain control device | |
| JP2000304629A (en) | Strain gauge adjusting device | |
| JPS59122923A (en) | Pressure transmitting device | |
| JP5284875B2 (en) | Offset voltage correction circuit | |
| JPH07273650A (en) | A/d converter circuit for nonlinear signal | |
| JPH0833213A (en) | Capacity indicator for secondary battery | |
| JP2001091373A (en) | Pressure sensor circuit | |
| JP3115358B2 (en) | Pressure control device | |
| JP2010278489A (en) | Non-inverting amplifier circuit and measuring machine | |
| JP2722351B2 (en) | Imaging signal processing device | |
| JPH0373822B2 (en) | ||
| US8081006B2 (en) | Non-linear sensor temperature compensation using summed temperature compensation signals | |
| JPH10221127A (en) | Sensor-signal conversion circuit | |
| Dutta et al. | Low offset, low noise, variable gain interfacing circuit with a novel scheme for sensor sensitivity and offset compensation for MEMS based, Wheatstone bridge type, resistive smart sensor | |
| JPS5847008B2 (en) | Weighing method | |
| JPS6165112A (en) | Sensor circuit with zero point compensation | |
| JPH01309417A (en) | Pre-stage circuit for ad converter | |
| JP2590914B2 (en) | Distortion generation circuit | |
| JPS61234121A (en) | Sensor amplifier circuit for pressure sensitive type touch panel | |
| KR19990017240A (en) | Analog input converter | |
| JPH0450967B2 (en) |