JPS6319802Y2 - - Google Patents
Info
- Publication number
- JPS6319802Y2 JPS6319802Y2 JP1979107322U JP10732279U JPS6319802Y2 JP S6319802 Y2 JPS6319802 Y2 JP S6319802Y2 JP 1979107322 U JP1979107322 U JP 1979107322U JP 10732279 U JP10732279 U JP 10732279U JP S6319802 Y2 JPS6319802 Y2 JP S6319802Y2
- Authority
- JP
- Japan
- Prior art keywords
- input impedance
- amplifier
- impedance measuring
- resistor
- resistors
- 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.)
- Expired
Links
- 230000001681 protective effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000002847 impedance measurement Methods 0.000 description 1
Landscapes
- Amplifiers (AREA)
Description
【考案の詳細な説明】
本考案は、出力に高入力インピーダンスの計測
器と低入力インピーダンスの計測器とを、相互干
渉を生じさせることなく、同時に複数接続するこ
との可能な多目的増幅器に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multipurpose amplifier capable of simultaneously connecting a plurality of high input impedance measuring instruments and low input impedance measuring instruments to its output without causing mutual interference.
従来、たとえば物体の応力を計測する歪計にお
いては、物体の応力を歪検出器によつて検出し、
この検出信号を増幅回路で増幅した後、指示計で
平均値として指示する一方、外部出力端子を設け
該出力端子に各種の計測器を接続して物体の応力
を外部から計測できるようにしてある。この場合
出力段は、第１図に示す如く、帰還抵抗RFによ
り充分な負帰還をかけて出力を安定させた増幅器
Ａの出力に保護抵抗Rpを直列に接続し、該保護
抵抗Rpの一端たる外部出力端子Voに各種の計測
器を接続するようにしてあつた。 Conventionally, for example, in a strain meter that measures the stress of an object, the stress of the object is detected by a strain detector,
After this detection signal is amplified by an amplifier circuit, it is indicated as an average value by an indicator, and an external output terminal is provided so that various measuring instruments can be connected to the output terminal so that the stress of the object can be measured from the outside. . In this case, in the output stage, as shown in Figure 1, a protective resistor Rp is connected in series with the output of an amplifier A whose output has been stabilized by applying sufficient negative feedback using a feedback resistor RF, and one end of the protective resistor Rp Various measuring instruments were connected to the external output terminal Vo.
前記保護抵抗Rpは、次のような理由から設け
られたものである。 The protective resistor Rp is provided for the following reasons.
外部出力端子Voに接続される計測器の種類と
しては、電磁オツシロ等のように入力インピーダ
ンスが３〜30Ω程度と非常に低い低入力インピー
ダンス計測器と、デジタルパネルメータ、データ
処理コンピユータ接続のためのインタフエイス回
路もしくはペン、オツシロ等のように、入力イン
ピーダンスが500KΩ以上の高い値を示す高入力
インピーダンス計測器の２種類がある。 The types of measuring instruments that can be connected to the external output terminal Vo include low input impedance measuring instruments with very low input impedance of about 3 to 30 Ω, such as electromagnetic diapers, digital panel meters, and devices for connecting data processing computers. There are two types of high input impedance measuring instruments that have a high input impedance of 500KΩ or more, such as interface circuits, pens, and Otsushiro.
高入力インピーダンス計測器を接続した場合に
は、外部出力端子Voに現れる安定な電圧信号を
そのまま計測できるのであるが、低入力インピー
ダンス計測器を接続した場合には、前述の保護抵
抗Rpがないと、外部出力端子Voに現れる電圧信
号によつて、過大な電流が流れ、電磁オツシロの
ガルバを焼損したり、あるいは増幅器Ａが過負荷
になる場合がある、そこで前述のような保護抵抗
Rpを設け、低入力インピーダンス計測器を接続
した場合の過電流保護手段としてある訳である。 When a high input impedance measuring device is connected, the stable voltage signal appearing at the external output terminal Vo can be directly measured, but when a low input impedance measuring device is connected, the protection resistor Rp mentioned above is not available. , due to the voltage signal appearing at the external output terminal Vo, an excessive current may flow and burn out the galvan of the electromagnetic switch, or overload the amplifier A.
Rp is provided as an overcurrent protection measure when a low input impedance measuring device is connected.
ところが前述のような保護抵抗Rpがあると、
第２図に示すように、外部出力端子Voに、低入
力インピーダンス計測器Baと高入力インピーダ
ンス計測器Bbとを並列に接続した場合、低入力
インピーダンス計測器Baに流入する電流によつ
て保護抵抗Rpに電圧降下が生じるため、高入力
インピーダンス計測器Bbに入力される電圧信号
が変化してしまい、正確な計測ができなくなると
いう重大な欠点がある。このため、従来は、低入
力インピーダンス計測器と高入力インピーダンス
計測器とを同時に接続することは不可能で、接続
される計測器の個数に応じた個数の増幅器を用意
しなければならず、コスト高くなるという欠点が
あつた。 However, if there is a protective resistance Rp as mentioned above,
As shown in Figure 2, when a low input impedance measuring device Ba and a high input impedance measuring device Bb are connected in parallel to the external output terminal Vo, the protective resistance is Since a voltage drop occurs at Rp, the voltage signal input to the high input impedance measuring device Bb changes, resulting in a serious drawback that accurate measurement cannot be performed. For this reason, conventionally, it was impossible to connect low input impedance measuring instruments and high input impedance measuring instruments at the same time, and it was necessary to prepare the number of amplifiers according to the number of connected measuring instruments, which led to high costs. The drawback was that it was expensive.
そこで本考案の目的は、上述する従来の欠点を
除去し、一個の増幅器を備えるだけで、低入力イ
ンピーダンス計測器と、高入力インピーダンス計
測器とを、相互干渉を生じさせることなく、同時
に複数個接続することの可能な多目的増幅器を提
供することにある。 Therefore, the purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional technology, and to simultaneously operate multiple low-input impedance measuring instruments and high-input impedance measuring instruments without causing mutual interference, simply by providing one amplifier. The object of the present invention is to provide a multipurpose amplifier that can be connected.
上記目的を達成するため、本考案は、出力端か
ら見た負荷側インピーダンスよりも充分小さい出
力インピーダンスを有する増幅器の前記出力端
に、複数の抵抗のそれぞれの一端を共通に接続す
ると共に、前記複数の抵抗のそれぞれの他端を、
互いに独立する外部出力端子に接続した多目的増
幅器であつて、前記抵抗を、前記外部出力端子の
一方に高入力インピーダンス計測器が接続され他
方の外部出力端子に低入力インピーダンス計測器
が接続されたときの当該計測器間の相互干渉を防
止する抵抗としたことを特徴とする。 In order to achieve the above object, the present invention connects one end of each of a plurality of resistors in common to the output end of an amplifier having an output impedance sufficiently smaller than the load-side impedance seen from the output end, and The other end of each of the resistors of
In a multipurpose amplifier connected to mutually independent external output terminals, the resistor is connected to one of the external output terminals with a high input impedance measuring device and the other external output terminal with a low input impedance measuring device. A resistor is used to prevent mutual interference between the measuring instruments.
以下実施例たる添付図面を参照し、本考案の内
容を具体的に詳説する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS The content of the present invention will be specifically explained in detail below with reference to the accompanying drawings, which are examples.
第３図は本考案に係る多目的増幅器の電気回路
図である。図に示すように、本考案においては、
出力側から入力側に負帰還抵抗RFにより充分な
負帰還をかけて出力インピーダンスを低下させ、
出力を安定させた増幅器Ａの出力端に、複数の抵
抗Rp1〜Rpoのそれぞれの一端を共通に接続する
と共に、これらの抵抗Rp1〜Rpoのそれぞれの他
端を、互いに独立する外部出力端子V1〜Voに接
続してある。 FIG. 3 is an electrical circuit diagram of a multi-purpose amplifier according to the present invention. As shown in the figure, in this invention,
The output impedance is lowered by applying sufficient negative feedback from the output side to the input side using the negative feedback resistor RF.
One end of each of the plurality of resistors Rp 1 to Rp o is commonly connected to the output terminal of the amplifier A whose output has been stabilized, and the other end of each of these resistors Rp 1 to Rp o is connected to an independent external It is connected to output terminals V 1 to V o .
抵抗Rp1〜Rpoの抵抗値は出力端子V1〜Voに接
続される計測器B1〜Boの許容電流値に応じて定
められるが、たとえば電磁オツシロなどを対象と
する場合は、10〜30Ω程度が望ましい。この抵抗
Rp1〜Rpoは抵抗値を同一にしてもよく、また異
ならせてもよい。 The resistance values of the resistors Rp 1 to Rp o are determined according to the allowable current values of the measuring instruments B 1 to B o connected to the output terminals V 1 to V o . Approximately 10 to 30Ω is desirable. This resistance
Rp 1 to Rpo may have the same resistance value or may have different resistance values.
ここで、出力側から入力側に充分に負帰還をか
けた増幅器Ａの出力インピーダンスは、例えば10
〜30Ω程度の値に選定される抵抗Rp1〜Rpoの抵
抗値に比較して、充分に小さくなることは自明で
ある。このような条件下においては、増幅器Ａの
出力端に、抵抗Rp1〜Rpoのそれぞれの一端を共
通に接続すると共に、これらの抵抗Rp1〜Rpoの
それぞれの他端を、互いに独立する外部出力端子
V1〜Voに接続し、出力端子V1〜Voに低入力イン
ピーダンス計測器と高入力インピーダンス計測器
とを同時に接続した場合でも、相互間に何らの干
渉も起こらず、正確な計測が可能となる。たとえ
ば出力端子V1に電磁オツシロ等の低入力インピ
ーダンス計測器B1を接続し、出力端子V2にデジ
タル、パネルメータ等の高入力インピーダンス計
測器B2を接続した場合を考えると、抵抗Rp1の両
端電圧は、計測器B1に流れ込む電流が大きくな
る程大きくなるが、増幅器Ａの出力インピーダン
スが抵抗Rp1に比較して充分に小さく、分岐点Ｃ
の電圧が抵抗Rp1による電圧降下分とは無関係に
一定の値で安定している。この分岐点Ｃの電圧は
抵抗Rp2を介して高入力インピーダンス計測器B2
に入力されるから、高入力インピーダンス計測器
B2においても、低入力インピーダンス計測器B1
の干渉を受けることなく、正確な計測が可能とな
る。 Here, the output impedance of amplifier A with sufficient negative feedback from the output side to the input side is, for example, 10
It is obvious that the resistance value is sufficiently small compared to the resistance value of the resistors Rp 1 to Rpo , which are selected to have a value of about 30Ω. Under such conditions, one end of each of the resistors Rp 1 to Rp o is commonly connected to the output terminal of amplifier A, and the other ends of each of these resistors Rp 1 to Rp o are connected independently from each other. External output terminal
V 1 to V o , and even if a low input impedance measuring instrument and a high input impedance measuring instrument are connected to the output terminals V 1 to V o at the same time, no interference will occur between them, and accurate measurements will be possible. It becomes possible. For example, if we connect a low input impedance measuring device B 1 such as an electromagnetic pitcher to the output terminal V 1 , and connect a high input impedance measuring device B 2 such as a digital or panel meter to the output terminal V 2 , the resistance Rp 1 The voltage across the terminal increases as the current flowing into the measuring device B1 increases, but since the output impedance of the amplifier A is sufficiently small compared to the resistor Rp1 , the voltage across the branch point C increases.
The voltage is stable at a constant value regardless of the voltage drop due to resistor Rp1 . The voltage at this branch point C is connected to the high input impedance measuring device B 2 through the resistor Rp 2 .
High input impedance measurement equipment
B 2 is also a low input impedance measuring instrument B 1
Accurate measurement is possible without interference.
しかも、低入力インピーダンス計測器B1に対
しては、抵抗Rp1による過電流保護作用が働き、
低入力インピーダンス計測器B1、増幅器Ａが過
電流から保護される。つまり、抵抗Rp1〜Rpoは
低入力インピーダンス計測器を接続した場合、保
護抵抗として働くのである。 Moreover, for the low input impedance measuring instrument B 1 , the overcurrent protection effect by the resistor Rp 1 works,
Low input impedance meter B 1 and amplifier A are protected from overcurrent. In other words, the resistors Rp 1 to Rp o function as protective resistors when a low input impedance measuring device is connected.
また、抵抗Rp1〜Rpoは、前述の如く、10〜30
Ωの低抵抗であり、高入力インピーダンス計測器
B2の入力抵抗に比し十分低いから、殆ど無視す
ることができる。 In addition, the resistance Rp 1 to Rp o is 10 to 30 as described above.
Ω low resistance, high input impedance measuring instrument
It is sufficiently low compared to the input resistance of B2 , so it can be almost ignored.
上記の効果は、出力端子V1〜Voのいずれに低
入力インピーダンス計測器および高入力インピー
ダンス計測器を接続しても、同様に得ることが可
能であり、したがつて本考案によれば、出力端子
V1〜Voの数に応じた多目的用途の増幅器を提供
することができる。 The above effects can be obtained in the same way even if a low input impedance measuring device and a high input impedance measuring device are connected to any of the output terminals V 1 to Vo . Therefore, according to the present invention, Output terminal
A multi-purpose amplifier can be provided depending on the number of V 1 to V o .
以上述べたように、本考案に係る多目的増幅器
は、出力端から見た負荷側インピーダンスよりも
充分小さい出力インピーダンスを有する増幅器の
前記出力端に、複数の抵抗のそれぞれの一端を共
通に接続すると共に、前記複数の抵抗のそれぞれ
の他端を、互いに独立する外部出力端子に接続し
た多目的増幅器であつて、前記抵抗を、前記外部
出力端子の一方に高入力インピーダンス計測器が
接続され他方の外部出力端子に低入力インピーダ
ンス計測器が接続されたときの当該計測器間の相
互干渉を防止する抵抗としたことを特徴とするか
ら、一個の増幅器を備えるだけで、低入力インピ
ーダンス計測器と、高入力インピーダンス計測器
とを、相互干渉を生じさせることなく、同時に、
複数個接続して使用することが可能であり、しか
も、低入力インピーダンス計測器や増幅器を過電
流から保護し得る多目的増幅器を提供することが
できる。 As described above, the multipurpose amplifier according to the present invention connects one end of each of the plurality of resistors in common to the output end of the amplifier having an output impedance sufficiently smaller than the load side impedance seen from the output end, and , a multipurpose amplifier in which the other ends of each of the plurality of resistors are connected to mutually independent external output terminals; The feature is that the resistor is used to prevent mutual interference between low input impedance measuring instruments when connected to the terminals, so with just one amplifier, both low input impedance measuring instruments and high input impedance measuring instruments can be connected. simultaneously with an impedance measuring instrument without causing mutual interference.
It is possible to provide a multi-purpose amplifier that can be used by connecting a plurality of them and that can protect low input impedance measuring instruments and amplifiers from overcurrent.
第１図は従来の増幅器の電気回路図、第２図は
同じくその欠点を説明する電気回路図、第３図は
本考案に係る多目的増幅器の電気回路図である。
Ａ……増幅器、Rp1〜Rpo……抵抗、V1〜Vo…
…外部出力端子。
FIG. 1 is an electrical circuit diagram of a conventional amplifier, FIG. 2 is an electrical circuit diagram illustrating its drawbacks, and FIG. 3 is an electrical circuit diagram of a multipurpose amplifier according to the present invention. A...Amplifier, Rp 1 ~ Rp o ... Resistor, V 1 ~ Vo ...
...External output terminal.
Claims (1)
分小さい出力インピーダンスを有する増幅器の前
記出力端に、複数の抵抗のそれぞれの一端を共通
に接続すると共に、前記複数の抵抗のそれぞれの
他端を、互いに独立する外部出力端子に接続した
多目的増幅器であつて、前記抵抗を、前記外部出
力端子の一方に高入力インピーダンス計測器が接
続され他方の外部出力端子に低入力インピーダン
ス計測器が接続されたときの当該計測器間の相互
干渉を防止する抵抗としたことを特徴とする多目
的増幅器。 One end of each of the plurality of resistors is commonly connected to the output end of the amplifier having an output impedance sufficiently smaller than the load side impedance seen from the output end, and the other end of each of the plurality of resistors is connected independently from each other. A multi-purpose amplifier connected to an external output terminal, the resistor being connected to one of the external output terminals and a low input impedance measuring instrument connected to the other external output terminal. A multipurpose amplifier characterized by a resistor that prevents mutual interference between measuring instruments.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979107322U JPS6319802Y2 (en) | 1979-08-02 | 1979-08-02 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979107322U JPS6319802Y2 (en) | 1979-08-02 | 1979-08-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5625264U JPS5625264U (en) | 1981-03-07 |
| JPS6319802Y2 true JPS6319802Y2 (en) | 1988-06-02 |
Family
ID=29339957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1979107322U Expired JPS6319802Y2 (en) | 1979-08-02 | 1979-08-02 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6319802Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2514299Y2 (en) * | 1992-12-28 | 1996-10-16 | ニューロング精密工業株式会社 | Screen printing machine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4919850A (en) * | 1972-05-20 | 1974-02-21 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5155663U (en) * | 1974-10-24 | 1976-04-30 |
-
1979
- 1979-08-02 JP JP1979107322U patent/JPS6319802Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4919850A (en) * | 1972-05-20 | 1974-02-21 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5625264U (en) | 1981-03-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Anderson | The new current loop: An instrumentation and measurement circuit topology | |
| GB1569150A (en) | Strain gauge arrangements | |
| US3034044A (en) | Electrical bridge | |
| JPS6319802Y2 (en) | ||
| CN116886056A (en) | Multi-range pA-mA level weak current amplifying device | |
| JPS61210965A (en) | Measuring equipment for low resistance | |
| JP2862296B2 (en) | Voltage applied current measuring device and current applied voltage measuring device | |
| US20030025485A1 (en) | Two path wide-band probe using pole-zero cancellation | |
| CN214750535U (en) | Current segmentation sampling system | |
| US3139579A (en) | Self-balancing simulated bridge circuit for measuring impedance | |
| US3543583A (en) | Circuit arrangement for connecting devices for picking up measuring values to be recorded | |
| JPH02159579A (en) | Precise current vs voltage amplifier | |
| ATE44827T1 (en) | MONITORING CIRCUIT FOR EVALUATION OF THE UEBERBW. BELOW SPECIFIED LIMIT VALUES. | |
| Anderson | Your successor to the Wheatstone bridge? NASA'S Anderson Loop | |
| US4249127A (en) | Standing wave ratio measuring system | |
| US3611123A (en) | Low insertion loss directional detector | |
| KR850000359B1 (en) | In-phase voltage elimination circuit for hall element | |
| US3453536A (en) | Common power supply resistance bridge system providing excitation,individual bridge sensor resistance,and signal output terminals all referenced to a common potential | |
| US3437925A (en) | Circuit for converting resistance values of unknown resistor to electrical potential signal for measurement purposes | |
| CN212988631U (en) | Temperature acquisition circuit, control panel and electrical equipment | |
| US2866948A (en) | Test circuit for interconnected components | |
| CN109141495A (en) | Sensor interface apparatus | |
| JP2509631Y2 (en) | Multi-channel resistance measuring device | |
| CN214473582U (en) | Milliampere-level current detection circuit, detection card and device based on operational amplifier | |
| JP4511717B2 (en) | Current / voltage measuring device |