JPS6194994U - - Google Patents
Info
- Publication number
- JPS6194994U JPS6194994U JP17658184U JP17658184U JPS6194994U JP S6194994 U JPS6194994 U JP S6194994U JP 17658184 U JP17658184 U JP 17658184U JP 17658184 U JP17658184 U JP 17658184U JP S6194994 U JPS6194994 U JP S6194994U
- Authority
- JP
- Japan
- Prior art keywords
- operational amplifier
- impedance
- inverting input
- impedances
- feedback
- 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
Links
- 238000001514 detection method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 1
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Description
第１図は本考案の一実施例を示す回路図、第２
図は零調整法を説明するための図、第３図および
第４図はそれぞれ零調整用発光ダイオードの他の
接続例を示す回路図である。
１１〜１４……演算増幅器、１５〜２２……抵
抗、２３，２４……発光ダイオード、２９……負
荷、３１……零調整用つまみ、４１……フイール
ド装置。
Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figure is a diagram for explaining the zero adjustment method, and FIGS. 3 and 4 are circuit diagrams showing other connection examples of the zero adjustment light emitting diodes, respectively. 11-14... operational amplifier, 15-22... resistor, 23, 24... light emitting diode, 29... load, 31... zero adjustment knob, 41... field device.
Claims (1)
帰還インピーダンスを備えた第１の演算増幅器と
、第２の検出入力電圧を非反転入力とする第２の
帰還インピーダンスを備えた第２の演算増幅器と
、これら第１および第２の演算増幅器の出力をそ
れぞれ非反転および反転入力とする第３の帰還イ
ンピーダンスを備えた第３の演算増幅器と、この
第３の演算増幅器の出力を非反転入力とするボル
テツジ・ホロワ接続の第４の演算増幅器と、第１
および第２の演算増幅器の反転入力端子間に接続
した第４のインピーダンスと、第１および第２の
演算増幅器の出力端子と第３の演算増幅器の両入
力端子間にそれぞれ接続した第５および第６のイ
ンピーダンスと、第３の演算増幅器の出力端子と
第４の演算増幅器の非反転入力端子間に接続した
第７のインピーダンスと、第３の演算増幅器の非
反転入力端子と第４の演算増幅器の出力端子間に
接続した第８のインピーダンスとを備え、第１と
第２の帰還インピーダンス、第５と第６のインピ
ーダンス、第７と第８のインピーダンスはそれぞ
れ相互にほぼ等しいインピーダンス値を有すると
ともに、第３の演算増幅器の出力により第４の演
算増幅器の非反転入力端子に接続された負荷に供
給される電流が正方向のときに所定の表示を行な
う第１の表示素子と、上記電流が負方向のときに
所定の表示を行なう第２の表示素子とを備えたこ
とを特徴とするフイールド装置。 A first operational amplifier includes a first feedback impedance that uses the first detection input voltage as a non-inverting input, and a second operational amplifier that includes a second feedback impedance that uses the second detection input voltage as a non-inverting input. an operational amplifier; a third operational amplifier having a third feedback impedance that uses the outputs of the first and second operational amplifiers as non-inverting inputs and non-inverting inputs; a fourth operational amplifier connected as an input voltage follower;
and a fourth impedance connected between the inverting input terminals of the second operational amplifier, and fifth and fifth impedances connected between the output terminals of the first and second operational amplifiers and both input terminals of the third operational amplifier, respectively. 6, a seventh impedance connected between the output terminal of the third operational amplifier and the non-inverting input terminal of the fourth operational amplifier, and the non-inverting input terminal of the third operational amplifier and the fourth operational amplifier. an eighth impedance connected between the output terminals of the feedback impedance, the first and second feedback impedances, the fifth and sixth impedances, and the seventh and eighth impedances each have substantially equal impedance values; , a first display element that performs a predetermined display when the current supplied to the load connected to the non-inverting input terminal of the fourth operational amplifier by the output of the third operational amplifier is in the positive direction; A field device comprising: a second display element that performs a predetermined display in a negative direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17658184U JPH0348713Y2 (en) | 1984-11-22 | 1984-11-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17658184U JPH0348713Y2 (en) | 1984-11-22 | 1984-11-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6194994U true JPS6194994U (en) | 1986-06-19 |
| JPH0348713Y2 JPH0348713Y2 (en) | 1991-10-17 |
Family
ID=30734178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17658184U Expired JPH0348713Y2 (en) | 1984-11-22 | 1984-11-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0348713Y2 (en) |
-
1984
- 1984-11-22 JP JP17658184U patent/JPH0348713Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0348713Y2 (en) | 1991-10-17 |
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