JPH0534583U - 4-terminal measurement circuit - Google Patents
4-terminal measurement circuitInfo
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- JPH0534583U JPH0534583U JP9220491U JP9220491U JPH0534583U JP H0534583 U JPH0534583 U JP H0534583U JP 9220491 U JP9220491 U JP 9220491U JP 9220491 U JP9220491 U JP 9220491U JP H0534583 U JPH0534583 U JP H0534583U
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- constant current
- terminal
- measurement display
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Abstract
(57)【要約】
【目的】 四端子測定法により各種測定を行なう際、定
電流端子の側のみならず、電圧検出端子の側の断線状態
の自動チェックをも行なう。
【構成】 定電流端子１３，１４相互間に配置される被
測定物Ｒｘに定電流ｉを流す定電流発生回路１１と、被
測定物Ｒｘでの電圧降下状態を検出する電圧検出端子２
２，２３を有する電圧測定表示部２４を備えた電圧測定
表示回路２１と、前記定電流端子１３，１４の断線状態
をチェックするための開放電圧監視回路１６とからなる
四端子測定回路において、電圧測定表示回路２１は、電
圧測定レンジを上回るように発生電圧が設定されている
電圧発生回路２９に接続させた電圧検出端子２２を入力
端子２６に、接地抵抗を有する電圧検出端子２３を入力
端子２７に接続し、出力端子２８を電圧測定表示部２４
の側に接続させた差動アンプ２５を介在させて形成し
た。
(57) [Abstract] [Purpose] When performing various measurements using the four-terminal measurement method, not only the constant current terminal side but also the voltage detection terminal side is automatically checked for disconnection. [Structure] A constant current generation circuit 11 for flowing a constant current i to a device under test Rx arranged between the constant current terminals 13 and 14, and a voltage detection terminal 2 for detecting a voltage drop state at the device under test Rx.
In a four-terminal measuring circuit comprising a voltage measuring and displaying circuit 21 having a voltage measuring and displaying unit 24 having 2, 23 and an open circuit voltage monitoring circuit 16 for checking the disconnection state of the constant current terminals 13, 14. The measurement display circuit 21 has a voltage detection terminal 22 connected to a voltage generation circuit 29 whose generated voltage is set to exceed the voltage measurement range as an input terminal 26, and a voltage detection terminal 23 having a ground resistance as an input terminal 27. Connected to the output terminal 28 of the voltage measurement display unit 24
It was formed with a differential amplifier 25 connected to the side of the.
Description
【０００１】[0001]
この考案は四端子測定回路に係り、さらに詳しくは、四端子測定法により各種 測定を行なう際、定電流端子の側のみならず、電圧検出端子の側の断線状態の自 動チェック機能をも備えた四端子測定回路に関する。 The present invention relates to a four-terminal measuring circuit, and more specifically, when performing various measurements by the four-terminal measuring method, it is provided with an automatic check function not only for the constant current terminal side but also for the disconnection state of the voltage detection terminal side. 4 terminal measurement circuit.
【０００２】[0002]
四端子測定法は、抵抗体である被測定物に電流を流すための定電流端子と、そ の際における電圧降下状態を検出するための電圧検出端子とを別個にして、計４ 本のリード線を用いて行なわれるものであり、この測定法によればリード線の抵 抗を測定値に含めずに測定することができるので、高精度の抵抗測定器であるデ ィジタルマルチメータやＬＣＲメータなどに多く採用されている。 The four-terminal measurement method uses a total of four leads, with a constant current terminal for applying a current to the DUT, which is a resistor, and a voltage detection terminal for detecting the voltage drop state at that time. This method is used to measure the resistance of the lead wire without including it in the measured value. Therefore, a highly accurate resistance measuring instrument such as a digital multimeter or an LCR meter can be used. It has been adopted by many.
【０００３】 ところで、このような四端子測定法による場合であっても、定電流端子の側が 断線していたり、被測定物から外れているといったような断線状態にある場合に は正確に測定することができない。By the way, even in the case of such a four-terminal measurement method, accurate measurement is performed when the constant current terminal is disconnected or disconnected from the object to be measured. I can't.
【０００４】 このため、四端子測定法に適用される四端子測定回路においては、定電流端子 の側の断線状態をチェックすることができる開放電圧監視回路が付設されている 例が多い。Therefore, in many cases, the four-terminal measuring circuit applied to the four-terminal measuring method is provided with an open-circuit voltage monitoring circuit capable of checking the disconnection state on the constant current terminal side.
【０００５】 図２は、四端子測定回路において開放電圧監視回路が付設されている場合の従 来構成の一例を示すものである。FIG. 2 shows an example of a conventional configuration in the case where an open circuit voltage monitoring circuit is attached to the four terminal measuring circuit.
【０００６】 同図によれば、その全体は、一対の定電流端子１３，１４相互間に配置される 被測定物Ｒｘに定電流ｉを流すための定電流電源１２を有して形成される定電流 発生回路１１と、前記被測定物Ｒｘでの電圧降下状態を検出するための一対の電 圧検出端子２２，２３を有して電圧を測定表示するための電圧測定表示部２４を 備えて形成される電圧測定表示回路２１と、前記定電流端子１３，１４の側の断 線状態をチェックするための開放電圧監視回路１６とで構成されている。According to the figure, the whole is formed by having a constant current power supply 12 arranged between a pair of constant current terminals 13 and 14 for supplying a constant current i to the device under test Rx. A constant current generation circuit 11 and a pair of voltage detection terminals 22 and 23 for detecting a voltage drop state in the object to be measured Rx are provided, and a voltage measurement display section 24 for measuring and displaying the voltage is provided. It is composed of a voltage measuring and displaying circuit 21 formed and an open circuit voltage monitoring circuit 16 for checking the disconnection state on the side of the constant current terminals 13 and 14.
【０００７】 このため、上記四端子測定回路によれば、定電流発生回路１１により定電流端 子１３，１４を介して被測定物Ｒｘに定電流ｉを流した際、電圧測定表示回路２ １は、電圧検出端子２２，２３を経た電圧測定表示部２４を介することで電圧を 読み取り、その測定結果を状態表示することができることになる。Therefore, according to the four-terminal measuring circuit, when the constant current generating circuit 11 causes the constant current i to flow through the object to be measured Rx through the constant current terminals 13 and 14, the voltage measurement display circuit 21 Means that the voltage can be read through the voltage measurement display unit 24 via the voltage detection terminals 22 and 23, and the measurement result can be displayed as a status.
【０００８】 また、定電流発生回路１１における定電流端子１３，１４の少なくともいずれ か一方が被測定物Ｒｘから外れていたり、断線していたりするといった断線状態 にある場合には、前記開放電圧監視回路１６により開放電圧を検出することがで きるので、電圧測定表示部２４に対し異常がある旨の状態表示をすることでこれ をチェックすることができるようになっている。Further, when at least one of the constant current terminals 13 and 14 in the constant current generating circuit 11 is in a disconnection state such as being disconnected from the object to be measured Rx or disconnected, the open circuit voltage monitoring is performed. Since the open circuit voltage can be detected by the circuit 16, this can be checked by displaying a status indicating that there is an abnormality on the voltage measurement display section 24.
【０００９】[0009]
ところで、上記四端子測定回路によれば、付設されている開放電圧監視回路１ ６により定電流端子１３，１４の少なくともいずれか一方の側が断線状態にある 場合、その開放電圧を検出してこれをチェックすることはできる。 By the way, according to the four-terminal measuring circuit, when at least one of the constant current terminals 13 and 14 is in a disconnection state by the attached open circuit voltage monitoring circuit 16, the open circuit voltage is detected and the You can check it.
【００１０】 しかし、電圧検出端子２２，１４の側が断線していたり、被測定物Ｒｘから外 れているような断線状態にある場合には、これを回路的にチェックすることがで きず、誤測定を行なってしまう不都合があった。However, when the voltage detection terminals 22 and 14 are disconnected or are disconnected from the object to be measured Rx, it cannot be checked in a circuit, and an erroneous check cannot be made. There was the inconvenience of making measurements.
【００１１】 また、このような不都合を回避するためには、保守のための点検作業時にその チェックをしたり、測定時における接続とは別の断線状態チェック用の接続に切 り替えてチェックをしなければならず、作業的に煩雑になる不具合があった。In order to avoid such an inconvenience, the check is performed at the time of inspection work for maintenance, or the connection is switched to a disconnection state check connection different from the connection at the time of measurement. However, there was a problem that it became complicated in terms of work.
【００１２】[0012]
この考案は、従来技術にみられた上記課題に鑑みてなされたものであり、その 構成上の特徴は、一対の定電流端子相互間に配置される被測定物に定電流を流す ための定電流電源を有してなる定電流発生回路と、前記被測定物での電圧降下状 態を検出するための一対の電圧検出端子を有して電圧を測定表示するための電圧 測定表示部を備えてなる電圧測定表示回路と、前記定電流端子の側の断線状態を チェックするための開放電圧監視回路とで形成される四端子測定回路であって、 前記電圧測定表示回路は、電圧測定表示部における電圧測定レンジを上回るよう にその発生電圧を予め設定してある電圧発生回路に接続させた一方の電圧検出端 子の側を一方の入力端子に、接地抵抗を有する他方の電圧検出端子の側を他方の 入力端子にそれぞれ接続し、その出力端子の側を電圧測定表示部の側に接続させ た差動アンプを介在させて形成したことにある。 The present invention has been made in view of the above problems in the prior art, and its structural feature is that a constant current for flowing a constant current to a DUT disposed between a pair of constant current terminals is provided. A constant current generating circuit having a current power source, and a voltage measurement display section for measuring and displaying the voltage having a pair of voltage detection terminals for detecting a voltage drop state in the DUT. A four-terminal measuring circuit formed by a voltage measuring and displaying circuit and an open circuit voltage monitoring circuit for checking a disconnection state on the side of the constant current terminal, wherein the voltage measuring and displaying circuit is a voltage measuring and displaying unit. The voltage detection terminal that is connected to a voltage generation circuit whose voltage is preset to exceed the voltage measurement range at is the input terminal at one side and the voltage detection terminal at the other side that has a ground resistance. To the other input terminal It is connected, in that which is formed by interposing the differential amplifier is connected to the side of the output terminal side of the voltage measurement display unit.
【００１３】[0013]
このため、電圧検出端子の側が異常な断線状態にある場合には、電圧発生回路 からの発生電圧が差動アンプの出力端子の側に出力され、これを読み込んだ電圧 測定表示部の側で入力オーバーである旨の表示をすることでそのチェックを行な うことができる。 Therefore, when the voltage detection terminal side is in an abnormal disconnection state, the voltage generated from the voltage generation circuit is output to the output terminal side of the differential amplifier and is input on the side of the voltage measurement display section that read it. The check can be performed by displaying that it is over.
【００１４】[0014]
以下、図面に基づいてこの考案の実施例を説明する。 An embodiment of the present invention will be described below with reference to the drawings.
【００１５】 図２との対応部分には同一の符号を付して示す図１は、この考案の一実施例を 示す回路構成図である。FIG. 1 in which parts corresponding to those in FIG. 2 are assigned the same reference numerals is a circuit configuration diagram showing an embodiment of the present invention.
【００１６】 同図によれば、その全体は、一対の定電流端子１３，１４相互間に配置される 被測定物Ｒｘに定電流ｉを流すための定電流電源１２を備えてなる定電流発生回 路１１と、前記被測定物Ｒｘにおける電圧降下の状態を検出するための一対の電 圧検出端子２２，２３を有してその電圧Ｖｘの測定表示を可能とした電圧測定表 示部２４を備えてなる電圧測定表示回路２１と、前記定電流端子１３，１４の側 の断線状態をチェックするための開放電圧監視回路１６とで構成されている。According to the figure, the whole of the constant current generator is provided with a constant current power supply 12 for supplying a constant current i to the device under test Rx arranged between the pair of constant current terminals 13 and 14. A voltage measurement display unit 24 having a circuit 11 and a pair of voltage detection terminals 22 and 23 for detecting the state of the voltage drop in the object to be measured Rx and capable of measuring and displaying the voltage Vx. It is composed of a voltage measurement display circuit 21 provided and an open circuit voltage monitoring circuit 16 for checking the disconnection state on the side of the constant current terminals 13 and 14.
【００１７】 このうち、前記電圧測定表示回路２１は、直流電圧を発生させるための電圧発 生回路２９に接続させた一方の電圧検出端子２２の側を一方の入力端子２６又は ２７、図示例によれば非反転入力端子２６に、接地抵抗Ｒを有する他方の電圧検 出端子２３の側を他方の入力端子２７又は２６、図示例によれば反転入力端子２ ７にそれぞれ接続し、その出力端子２８の側を電圧測定表示部２４の側に接続さ せた差動アンプ２５を介在させて形成されている。Among them, the voltage measuring and displaying circuit 21 has one input terminal 26 or 27, which is connected to a voltage generating circuit 29 for generating a DC voltage, on one input terminal 26 or 27. According to this, the non-inverting input terminal 26 is connected to the other voltage detecting terminal 23 having the grounding resistance R, and the other input terminal 27 or 26 is connected to the inverting input terminal 27 according to the illustrated example. It is formed with a differential amplifier 25 having the side of 28 connected to the side of the voltage measurement display unit 24.
【００１８】 この場合、電圧測定表示部２４は、差動アンプ２５の出力端子２８に接続され てその電圧の測定を可能とした電圧計と、この電圧計による測定結果を表示する ためのＣＲＴやＬＣＤなどからなる表示器とを少なくとも備えて形成されている 。In this case, the voltage measurement display unit 24 includes a voltmeter connected to the output terminal 28 of the differential amplifier 25 and capable of measuring the voltage, a CRT for displaying the measurement result by the voltmeter, and the like. It is formed by including at least a display such as an LCD.
【００１９】 また、前記電圧発生回路２９での発生電圧Ｖは、実測される被測定物Ｒｘとの 関係で規定される電圧測定表示部２４における電圧計の測定レンジを上回るよう に予め設定されている。The voltage V generated by the voltage generation circuit 29 is preset so as to exceed the measurement range of the voltmeter in the voltage measurement display unit 24 defined by the relationship with the measured object Rx to be measured. There is.
【００２０】 この考案は、上述したようにして構成されているので、定電流発生回路１１に おける定電流端子１３，１４を介して被測定物Ｒｘに定電流ｉを流した際、電圧 測定表示回路２１は電圧検出端子２２，２３を介して測定される電圧Ｖｘを電圧 測定表示部２４における電圧計で読み取り、その状態を表示器に表示することが できる。Since the present invention is configured as described above, when the constant current i is applied to the device under test Rx through the constant current terminals 13 and 14 of the constant current generation circuit 11, the voltage measurement display is displayed. The circuit 21 can read the voltage Vx measured via the voltage detection terminals 22 and 23 with a voltmeter in the voltage measurement display unit 24 and display the state on the display.
【００２１】 この場合、定電流発生回路１１における定電流端子１３，１４の少なくともい ずれか一方が被測定物Ｒｘから外れていたり、断線していたりする場合には、前 記開放電圧監視回路１６により開放端子電圧が検出され、電圧測定表示部２４に おける表示器に定電流ｉに異常がある旨の表示、例えば「ＮＧ」の表示がなされ 、これを確認することで定電流端子１３，１４の断線状態をチェックすることが できる。In this case, when at least one of the constant current terminals 13 and 14 in the constant current generating circuit 11 is out of the object to be measured Rx or is broken, the open circuit voltage monitoring circuit 16 described above is used. The open terminal voltage is detected by the display, and the display in the voltage measurement display section 24 indicates that the constant current i is abnormal, for example, "NG" is displayed. By confirming this, the constant current terminals 13 and 14 are confirmed. It is possible to check the disconnection status of.
【００２２】 一方、電圧測定表示回路２１における電圧検出端子２２，２３の少なくともい ずれか一方が被測定物Ｒｘから外れていたり、断線していたりする場合のチェッ ク機能については、電圧検出端子２２，２３の側が断線状態にない正常時と、断 線状態にある異常時とに場合分けをして説明する。On the other hand, regarding the check function in the case where at least one of the voltage detection terminals 22 and 23 in the voltage measurement display circuit 21 is detached from the object to be measured Rx or is broken, the voltage detection terminal 22 , 23 will be described separately for a normal state where the wire is not disconnected and an abnormal state where the wire is disconnected.
【００２３】 まず、電圧検出端子２２，２３の側が断線状態にない正常時について説明すれ ば、一方の電圧検出端子２２の側には電圧発生回路２９が接続されており、しか も、被測定物Ｒｘに対して他方の電圧検出端子２３の側の接地抵抗Ｒは非常に大 きいので、差動アンプ２５における一方の側の入力端子、図示例においては非反 転入力端子２６の側の電圧Ｖ1 については、電圧発生回路２９からの発生電圧Ｖ が加算され、Ｖ1 ＝ｉＲｘ＋Ｖとなる。First, a description will be given of a normal time in which the voltage detection terminals 22 and 23 are not in a disconnection state. A voltage generation circuit 29 is connected to one of the voltage detection terminals 22 and only the measured object is measured. Since the ground resistance R on the side of the other voltage detection terminal 23 is very large with respect to Rx, the voltage V on the side of the input terminal on one side of the differential amplifier 25, that is, the voltage on the side of the non-inverted input terminal 26 in the illustrated example. For 1 , the generated voltage V 1 from the voltage generation circuit 29 is added, and V 1 = iRx + V.
【００２４】 また、他方の側の入力端子、図示例にあっては反転入力端子２７の側における 電圧Ｖ2 については、電圧発生回路２９からの発生電圧Ｖと等しくなる（Ｖ2 ＝ Ｖ）。The voltage V 2 at the other input terminal, that is, the inverting input terminal 27 side in the illustrated example, is equal to the generated voltage V from the voltage generating circuit 29 (V 2 = V).
【００２５】 したがって、差動アンプ２５の出力端子２８の側には、電圧ｉＲｘのみが出力 され、これを電圧測定表示部２４を介して測定表示することができることになる 。Therefore, only the voltage iRx is output to the output terminal 28 side of the differential amplifier 25, which can be measured and displayed via the voltage measurement display unit 24.
【００２６】 また、電圧検出端子２２，２３の側が断線等の異常状態にある場合には、差動 アンプ２５における一方の側の入力端子、図示例においては非反転入力端子２６ の側の電圧Ｖ1 が電圧発生回路２９からの発生電圧Ｖとなり、他方の側の入力端 子、図示例においては反転入力端子２７の側の電圧Ｖ2 が零となり、差動アンプ ２５の出力端子２８の側には、電圧発生回路２９からの発生電圧Ｖのみが出力さ れることになる。Further, when the voltage detection terminals 22 and 23 are in an abnormal state such as disconnection, the voltage V on the input terminal on one side of the differential amplifier 25, that is, the voltage V on the non-inverting input terminal 26 side in the illustrated example. 1 becomes the voltage V generated from the voltage generating circuit 29, the voltage V 2 at the input terminal on the other side, that is, the inverting input terminal 27 side in the illustrated example becomes 0, and the voltage becomes V on the output terminal 28 side of the differential amplifier 25. Means that only the generated voltage V from the voltage generation circuit 29 is output.
【００２７】 したがって、電圧検出端子２２，２３の側が断線状態にある場合には、電圧測 定表示部２４における電圧計が入力オーバーとなり、これを表示部を介して例え ば「ＮＧ」などと表示することでチェックすることができる。Therefore, when the voltage detection terminals 22 and 23 are in a disconnection state, the voltmeter in the voltage measurement display section 24 becomes over-input, and this is displayed on the display section as “NG”, for example. You can check by doing.
【００２８】[0028]
以上述べたようにこの考案によれば、電圧検出端子の側が断線等の異常状態に ある場合には、電圧発生回路からの発生電圧が差動アンプの出力端子の側に出力 され、電圧測定表示部により入力オーバーである旨の表示をすることでこれを確 認することができるので、例えば自動ラインに組み込まれているような場合であ っても、その異常状態を直ちに知ることができ、測定作業を効率的に、しかもそ の精度を高くして遂行することができる。 As described above, according to the present invention, when the voltage detection terminal side is in an abnormal state such as a disconnection, the voltage generated from the voltage generation circuit is output to the output terminal side of the differential amplifier and the voltage measurement display is performed. It is possible to confirm this by displaying that the input is over by the section, so even if it is incorporated in an automatic line, for example, it is possible to immediately know the abnormal state, Measurement work can be performed efficiently and with high accuracy.
【図１】この考案の一実施例についての概略構成を示す
回路図。FIG. 1 is a circuit diagram showing a schematic configuration of an embodiment of the present invention.
【図２】従来からある四端子測定回路の一例を示す回路
図。FIG. 2 is a circuit diagram showing an example of a conventional four-terminal measuring circuit.
１１ 定電流発生回路 １２ 定電流電源 １３ 定電流端子 １４ 定電流端子 １６ 開放電圧監視回路 ２１ 電圧測定表示回路 ２２ 電圧検出端子 ２３ 電圧検出端子 ２４ 電圧測定表示部 ２５ 差動アンプ ２６ 非反転入力端子 ２７ 反転入力端子 ２８ 出力端子 ２９ 電圧発生回路 Ｒｘ 被測定物 Ｒ 接地抵抗 11 constant current generating circuit 12 constant current power supply 13 constant current terminal 14 constant current terminal 16 open circuit voltage monitoring circuit 21 voltage measurement display circuit 22 voltage detection terminal 23 voltage detection terminal 24 voltage measurement display section 25 differential amplifier 26 non-inverting input terminal 27 Inverting input terminal 28 Output terminal 29 Voltage generation circuit Rx DUT R Ground resistance
Claims (1)
測定物に定電流を流すための定電流電源を有してなる定
電流発生回路と、前記被測定物での電圧降下状態を検出
するための一対の電圧検出端子を有して電圧を測定表示
するための電圧測定表示部を備えてなる電圧測定表示回
路と、前記定電流端子の側の断線状態をチェックするた
めの開放電圧監視回路とで形成される四端子測定回路に
おいて、前記電圧測定表示回路は、電圧測定表示部にお
ける電圧測定レンジを上回るようにその発生電圧を予め
設定してある電圧発生回路に接続させた一方の電圧検出
端子の側を一方の入力端子に、接地抵抗を有する他方の
電圧検出端子の側を他方の入力端子にそれぞれ接続し、
その出力端子の側を電圧測定表示部の側に接続させた差
動アンプを介在させて形成したことを特徴とする四端子
測定回路。1. A constant current generating circuit having a constant current power source for supplying a constant current to an object to be measured arranged between a pair of constant current terminals, and a voltage drop state in the object to be measured. A voltage measurement display circuit comprising a voltage measurement display unit for measuring and displaying a voltage having a pair of voltage detection terminals for detecting, and an open circuit voltage for checking the disconnection state of the constant current terminal side. In a four-terminal measurement circuit formed with a monitoring circuit, the voltage measurement display circuit is connected to a voltage generation circuit whose generated voltage is preset so as to exceed the voltage measurement range in the voltage measurement display unit. The voltage detection terminal side is connected to one input terminal, the other voltage detection terminal side having a ground resistance is connected to the other input terminal,
A four-terminal measurement circuit, characterized in that it is formed by interposing a differential amplifier whose output terminal side is connected to the voltage measurement display section side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991092204U JP2580064Y2 (en) | 1991-10-15 | 1991-10-15 | Four-terminal measurement circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991092204U JP2580064Y2 (en) | 1991-10-15 | 1991-10-15 | Four-terminal measurement circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0534583U true JPH0534583U (en) | 1993-05-07 |
| JP2580064Y2 JP2580064Y2 (en) | 1998-09-03 |
Family
ID=14047922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1991092204U Expired - Fee Related JP2580064Y2 (en) | 1991-10-15 | 1991-10-15 | Four-terminal measurement circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2580064Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012013588A (en) * | 2010-07-02 | 2012-01-19 | Hioki Ee Corp | Four-terminal type impedance measurement apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7406925B2 (en) | 2019-05-20 | 2023-12-28 | 日本信号株式会社 | Equipment monitoring device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5925479U (en) * | 1982-08-10 | 1984-02-17 | 沖電気工業株式会社 | Contact resistance measurement circuit |
| JPH02176574A (en) * | 1988-12-28 | 1990-07-09 | Matsushita Electric Ind Co Ltd | Electronic parts measuring instrument |
-
1991
- 1991-10-15 JP JP1991092204U patent/JP2580064Y2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5925479U (en) * | 1982-08-10 | 1984-02-17 | 沖電気工業株式会社 | Contact resistance measurement circuit |
| JPH02176574A (en) * | 1988-12-28 | 1990-07-09 | Matsushita Electric Ind Co Ltd | Electronic parts measuring instrument |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012013588A (en) * | 2010-07-02 | 2012-01-19 | Hioki Ee Corp | Four-terminal type impedance measurement apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2580064Y2 (en) | 1998-09-03 |
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