WO2000058739A1 - Dispositif et procede de mesure de differentes resistances de contacts electriques, en particulier de fiches de raccordement - Google Patents

Dispositif et procede de mesure de differentes resistances de contacts electriques, en particulier de fiches de raccordement Download PDF

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Publication number
WO2000058739A1
WO2000058739A1 PCT/EP2000/002119 EP0002119W WO0058739A1 WO 2000058739 A1 WO2000058739 A1 WO 2000058739A1 EP 0002119 W EP0002119 W EP 0002119W WO 0058739 A1 WO0058739 A1 WO 0058739A1
Authority
WO
WIPO (PCT)
Prior art keywords
measuring
contact
electrical contact
measuring device
electrical
Prior art date
Application number
PCT/EP2000/002119
Other languages
German (de)
English (en)
Inventor
Frank Hübner-Obenland
Jürgen MINUTH
Original Assignee
Daimlerchrysler Ag
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 Daimlerchrysler Ag filed Critical Daimlerchrysler Ag
Publication of WO2000058739A1 publication Critical patent/WO2000058739A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
    • G01R27/205—Measuring contact resistance of connections, e.g. of earth connections

Definitions

  • the invention relates to a device and a method for measuring variable resistances - hereinafter “contact resistances v” - electrical contacts, in particular electrical plug connections consisting of a socket and plug pin.
  • vibration resistance of electrical contacts they can be connected to a vibration generator, e.g. arranged on a vibrating table (so-called shaker) and exposed to permanent vibration. After this vibration exposure, the electrical resistance is measured, which slowly changes due to the vibration exposure. In addition to these slow changes in resistance, brief contact interruptions can also occur. In particular, the brief interruptions in contact are often the cause of a failure of electronics, e.g. in the automotive sector.
  • a vibration generator e.g. arranged on a vibrating table (so-called shaker) and exposed to permanent vibration. After this vibration exposure, the electrical resistance is measured, which slowly changes due to the vibration exposure. In addition to these slow changes in resistance, brief contact interruptions can also occur. In particular, the brief interruptions in contact are often the cause of a failure of electronics, e.g. in the automotive sector.
  • a bridge circuit for the simultaneous measurement of current and voltage of an electrical consumer can be found in DE-A-2 045 376.
  • the invention has for its object to avoid errors in the measurement of short interruptions in contact of an electrical contact.
  • the measurement is carried out during the vibration exposure. So that the electromagnetic radiation occurring here does not cause measurement errors, the electrical lines between the electrical contact and measurement electronics measuring the contact resistance are surrounded by an electromagnetic shield. As a result, the risk of electromagnetic interference in the measuring lines is considerably reduced or completely eliminated. The measurement signals received by the measuring electronics are not falsified.
  • the electrical contact is designed as a crimp connection, plug connection or insulation displacement connection.
  • Electrode A can mean both a single-pole contact and several (single-pole) contacts. In this way, several single-pole contacts (eg multi-pole plug connection) can be tested at the same time, each contact being assigned the same measuring circuit or measuring electronics. These same circuits and measuring units or the like on a common circuit board. be integrated. It is also possible to measure a series connection of several contact points simultaneously using a single measuring electronics, the two connection ends of the series connection being connected to the measuring electronics.
  • the entire measuring system preferably has a large number of prefabricated structural units available on the market. As a result, the costs for the measurement setup remain limited.
  • an evaluation unit in the form of a transient recorder connected to the output of the measuring electronics can be designed.
  • Meßelek ⁇ be processed electronics and evaluated.
  • Transient recorders are well suited for recording incidental events such as contact interruptions.
  • the evaluation unit can be controlled by a conventional PC (personal computer), the hard disk of which can serve as a measurement data memory.
  • the evaluation unit can also be integrated in the measuring electronics.
  • the measuring signals are raised by the measuring electronics to a level that is not susceptible to interference and - advantageously in a differential form - sent to the evaluation unit via shielded, twisted lines, where they are recorded and possibly further processed.
  • the measuring electronics can include a measuring bridge, a voltage regulator and / or components for interference suppression.
  • the electrical contact and the measuring electronics are advantageously arranged adjacent that the electrical lines vZ.B. Connecting lines, measuring lines, signal lines) between them can be kept short.
  • the short cable lines reduce the risk of electromagnetic interference from the outset and also reduce the effort required for shielding.
  • Claim 2 supports the error-free measurement of the contact resistance.
  • Claims 3 and 4 relate to further advantageous measures in order to keep the line connection between the contact connection and the measuring electronics as short as possible and thereby minimize the possibility of electromagnetic radiation on the line connection.
  • a housing surrounding the contact and the housing with the measuring electronics are preferably fixed or fastened on the vibration generator.
  • suitable measures are taken to ensure that they are vibration-resistant.
  • the contact can be fixed directly on the vibrator or on a separate mounting base which is connected to the movable part of the vibrator via mechanical coupling means.
  • a common housing for the contact and the measuring electronics simplifies their mounting and fixing on the vibration generator.
  • the contact connection and the measuring electronics are shielded from radiation together. Even very small measured values can be recorded in this way. Long measuring lines between the contact and the measuring electronics can be effectively avoided. The risk of electromagnetic interference is further reduced.
  • a housing according to claim 6 In order to be able to effectively shield even low-frequency electromagnetic radiation, a housing according to claim 6 is proposed.
  • the entire housing consists of a magnetizable material.
  • This is preferably a solid steel housing.
  • a solidly constructed housing avoids the risk that the housing will resonate at high vibrational accelerations and falsify the measurement.
  • Claim 7 proposes an inexpensive and easy to implement four-wire measurement for measuring the contact resistance.
  • the contact voltage and / or the contact current can be used are also initially taken up by proportional variables, in order to derive the contact voltage and the contact current via these variables in terms of circuit technology or in some other way.
  • a large measuring range (e.g. approx. 100 ⁇ to approx. Lk) can be realized. Both the contact current and the contact voltage are measured and logarithmic. As a result, a large measuring range can be compressed with sufficient accuracy so that the further processed measuring signals have a reasonable bandwidth.
  • the extensive resistance range enables an effective assessment of contacts, in particular connectors.
  • the circuitry that is easy to implement in terms of circuitry is preferably part of the measuring electronics, so that the measuring value of interest, namely the logging resistance, is already determined in the measuring electronics. As a result, the number of fault-sensitive lines from the measuring electronics to an evaluation unit and the number of channels which may be present in the evaluation unit are reduced in a cost-saving manner.
  • the number of operational amplifiers required in the measuring electronics can be greatly reduced, which increases the speed of the measuring electronics and reduces the circuitry.
  • Claim 10 relates to a resistance mechanism as part of the measuring device.
  • the resistance network and its advantageous configurations according to claims 11 to 14 form a measuring circuit with a high cutoff frequency.
  • brief contact interruptions can also be recorded and investigated with the measurement setup.
  • this can Meßschal- tion for measuring static a ⁇ s and any dynamic resistances are used and is not necessarily limited to the use for the measurement of contact resistances of claim.
  • the dimensioning of the measuring circuit according to claims 11 to 14 contributes, inter alia, to the fact that the current and voltage of the energy source connected to the contact remain limited.
  • the contact current can advantageously be measured indirectly by tapping a bridge voltage.
  • the energy source and the series resistor are replaced by a bipolar voltage source.
  • the contact is connected to two circuits.
  • a variable current arises through one circuit, while the falling contact voltage is measured with the other circuit.
  • the current which changes during the measurement causes induction voltages which can distort the measurement signals.
  • an arrangement according to claim 16 is proposed.
  • the two circuits are preferably so arranged that the area enclosed by the two circuits surfaces do not overlap area ⁇ pen.
  • Claims 17 to 20 relate to advantageous measures in order to use the measurement setup to reproduce the natural behavior of a contact and a cable section connected to it as exactly as possible and to obtain realistic measurement results. In this way, realistic studies regarding the contacts to be installed in motor vehicles, in particular plug connections, and the lines connected to them are supported.
  • Fig. 1 is a schematic representation of the measuring device
  • Fig. 2 is a schematic representation of an m of the Meßelektro ⁇ nik contained Loga ⁇ thmieremheit
  • Fig. 3 the circuit diagram of a resistor network included in the electronic hardware
  • Fig. 4 is a schematic representation of a contact integrated with the measuring electronics in a housing.
  • a measuring device 1 for measuring the contact resistance R of an electrical plug connection 2 contains an oscillation generator 3 for generating mechanical vibrations which act on the plug connection 2 during the measurement.
  • the plug connection 2 - it can be single-pole or multi-pole - is shown schematically by the symbols for a plug pin 4 and a corresponding socket 5 (Fig.l).
  • the plug connection and the contact resistance R ⁇ measuring Me ⁇ ßelektronik 6 are adjacent m a single housing 7 is integrated, which the measuring electronics 6 and the connector 2 and the measuring electronics 6 electrically connecting pipes 8, 8 ', 36, 36' against electromagnetic interference shields (Fig.l).
  • the plug connection 2 and the measuring electronics 6 are detachably fastened by means of the housing 7 to the mounting surface 9 of a movable component 10 of the vibration generator 3.
  • This component 10 which transmits the mechanical vibrations to the plug connection 2, projects beyond a surface 11 of the immovable part 17 of the vibration generator 3.
  • the electrical components contained in the housing 7 are fed by an electrical power supply 12 or another electrical energy source.
  • the power supply unit 12 is connected via a feed line 13 to the electrical components arranged in the housing 7.
  • Five electrical contacts - for example a five-pin plug connection or five individual contacts - are tested simultaneously.
  • the evaluation unit 15 is controlled by a computer 16 (for example a PC).
  • a plug current 2 flows through a contact current I, which is generated by an electrical current source 17.
  • the measuring electronics 6 takes during the Measure the contact current I flowing through the connector 2 and the contact voltage U K at the connector 2 as measured values (FIG. 2).
  • a logarithmic unit 20 with the inputs 18, 18 'and 19, 19' is present in the measuring electronics 6.
  • the inputs 18, 18 'are assigned to a first logarithm 21 and the inputs 19, 19' are assigned to a second log 22.
  • the loganized measured values l ogü ⁇ and l ogI ⁇ are present .
  • the voltage source 27 which acts on the plug-in connection 2 — m denoted by “U * in FIG. 3, the value of U being arbitrary — is connected in a preferred embodiment to a resistance network 28. It contains a Bruckenschal- tung with two parallel-connected voltage dividers, wherein the voltage source 27 to the branching point 29 of the parallel ⁇ circuit and to its branching point 29 'connected with the interposition of a series resistor R c.
  • the connector 2 is connected in parallel to the resistor R of the voltage divider containing the two resistors R ⁇ and R 4 .
  • a bridge voltage U can be tapped directly, which is proportional to the contact current I ⁇ .
  • the two tapping points 30, 30 'then correspond to the inputs 19, 19' of the logger 22 m, FIG. 2.
  • the current of the energy source is divided into m a current A flowing through the resistor R x and a current I flowing through the resistor R.
  • the resistor network has the following properties: U ⁇ LR ⁇ , (1)
  • R 4 (U rax / U) (R, + RX (5)
  • R. >> R 4 (8) where the resistors R and R. can be chosen freely and the resistors Ri and R ⁇ are preferably at least 10 times larger than the resistors R and R 4 .
  • both their connectors and their lines are fixed with suitable fastening means.
  • a free-swinging line section is created between the fastener for the connector and the fastener for a location on the line.
  • the swing of this line section and its eventual resonance behavior is a significant cause of occurring in the real case, mechanical loading of the Steckver ⁇ binders.
  • This real case is simulated in the measurement setup in the housing 7 according to FIG.
  • the plug connection 2 or its insulating housing m is fixed to the housing 7 according to FIG. 4 by means of a first fixing element 31 and two connecting lines 8, 8 'connected to the plug connection 2 by means of a second fixing element 32 on the housing base 33 of the housing 7.
  • the connecting lines 8, 8 ' are connected to the measuring electronics 6 by means of an electrical connecting part 34.
  • the plug connection 2 is connected to the energy source contained in the measuring electronics 6 to form a closed circuit.
  • Another circuit contains two measuring lines 36 and 36 ', the ⁇ er connector 2 and over the connecting part 34 'are connected to the measuring electronics 6 in order to measure the contact voltage U falling on the plug connection 2.
  • a variable current flows through the connector 2 during the measurement. This current produces a changing magneti ⁇ ULTRASONIC field. If the circuit for measuring the contact voltage U ⁇ was located in this magnetic field, a voltage is induced in this circuit which falsifies the measurement signals.
  • the twisted arrangement of the connecting lines 8, 8 'and the measuring lines 36, 36' shown in FIG. 1 avoids such falsifications, since the surfaces enclosed by the two circuits do not overlap.
  • the measuring lines 36, 36 'and the connecting line 8' are preferably designed as thin measuring leads with a light and highly flexible silicone insulation. In this way, influences on the mechanical behavior of the connection line 8 are avoided. This is particularly of great importance tung ⁇ when a connecting line - as explained above - a part intended to represent an automotive wiring harness.
  • the cross section of the fixed connecting line 8 corresponds approximately to the cross section of the corresponding line section arranged in the motor vehicle.
  • the measurement setup enables the course of the contact resistance R ⁇ to be recorded during a vibration exposure test.
  • the contact resistance R f can be recorded synchronously with the acceleration of the vibration generator.
  • the mechanical wear pattern can be compared with the electrical behavior of the contact.
  • Knowledge of the mechanical structure of the contact surface and the course of the electrical contact resistance R. during the movement of the corresponding electrical contact parts (for example plug and socket) against one another enable meaningful statements about the basic mechanisms of electrical contact interruptions.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

Cette invention concerne un dispositif (1) de mesure de différentes résistances (résistances de contact) de contacts électriques, en particulier de fiches de raccordement (2), comprenant un générateur d'oscillations (3) qui, durant la mesure, met le contact électrique (2) en oscillation mécanique. Un dispositif électronique de mesure (6) mesure la résistance de contact. Les conducteurs électriques (8, 8', 36, 36') reliant le contact électrique (2) avec le dispositif électronique de mesure (6) sont entourés d'une protection électromagnétique (7).
PCT/EP2000/002119 1999-03-26 2000-03-10 Dispositif et procede de mesure de differentes resistances de contacts electriques, en particulier de fiches de raccordement WO2000058739A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999113791 DE19913791C2 (de) 1999-03-26 1999-03-26 Vorrichtung zur Messung veränderlicher Widerstände elektrischer Kontakte, insbesondere Steckverbindungen
DE19913791.9 1999-03-26

Publications (1)

Publication Number Publication Date
WO2000058739A1 true WO2000058739A1 (fr) 2000-10-05

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DE (1) DE19913791C2 (fr)
WO (1) WO2000058739A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102087327A (zh) * 2011-01-14 2011-06-08 安徽鑫昊等离子显示器件有限公司 连接器嵌合状态检测装置
CN103926523A (zh) * 2014-04-18 2014-07-16 无锡优为照明科技有限公司 一种导体之间接触导电不良的模拟装置和模拟方法
CN112424620A (zh) * 2018-07-24 2021-02-26 Amad 曼奈柯斯控股有限责任两合公司 对于插塞装置中的接触区域的监控

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020115295A1 (de) 2020-06-09 2021-12-09 Lisa Dräxlmaier GmbH Prüfvorrichtung für einen steckverbinder und verfahren zum betreiben einer prüfvorrichtung für einen steckverbinder

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DE2045376A1 (de) * 1969-09-15 1971-04-15 Tesla Orava Np Schaltung zum Messen einer Spannung und eines Stromes oder einer Leistung eines Verbrauchers unter Vermeidung des durch Eigenverbrauch der Einrichtungen ver ursachten Fehlers
DE3545114A1 (de) * 1985-12-19 1987-06-25 Siemens Ag Pruef- und messeinrichtung fuer elektrische kontakte, insbesondere von steckkontakten fuer die nachrichtentechnik
JPH03242568A (ja) * 1990-02-20 1991-10-29 Fujitsu Syst Constr Kk コネクタ付ケーブルの試験装置
JPH04337478A (ja) * 1991-05-15 1992-11-25 Matsushita Electric Works Ltd 電気的接触部の検査方法及びその検査装置

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DE2045376A1 (de) * 1969-09-15 1971-04-15 Tesla Orava Np Schaltung zum Messen einer Spannung und eines Stromes oder einer Leistung eines Verbrauchers unter Vermeidung des durch Eigenverbrauch der Einrichtungen ver ursachten Fehlers
DE3545114A1 (de) * 1985-12-19 1987-06-25 Siemens Ag Pruef- und messeinrichtung fuer elektrische kontakte, insbesondere von steckkontakten fuer die nachrichtentechnik
JPH03242568A (ja) * 1990-02-20 1991-10-29 Fujitsu Syst Constr Kk コネクタ付ケーブルの試験装置
JPH04337478A (ja) * 1991-05-15 1992-11-25 Matsushita Electric Works Ltd 電気的接触部の検査方法及びその検査装置

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102087327A (zh) * 2011-01-14 2011-06-08 安徽鑫昊等离子显示器件有限公司 连接器嵌合状态检测装置
CN103926523A (zh) * 2014-04-18 2014-07-16 无锡优为照明科技有限公司 一种导体之间接触导电不良的模拟装置和模拟方法
CN103926523B (zh) * 2014-04-18 2016-08-17 无锡优为照明科技有限公司 一种导体之间接触导电不良的模拟装置和模拟方法
CN112424620A (zh) * 2018-07-24 2021-02-26 Amad 曼奈柯斯控股有限责任两合公司 对于插塞装置中的接触区域的监控

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DE19913791A1 (de) 2000-10-12
DE19913791C2 (de) 2003-05-28

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