[go: up one dir, main page]

WO2018196926A1 - Dispositif de contrôle et procédé de mesure d'impédance à résolution spatiale de câbles de données pour un véhicule - Google Patents

Dispositif de contrôle et procédé de mesure d'impédance à résolution spatiale de câbles de données pour un véhicule Download PDF

Info

Publication number
WO2018196926A1
WO2018196926A1 PCT/DE2018/100406 DE2018100406W WO2018196926A1 WO 2018196926 A1 WO2018196926 A1 WO 2018196926A1 DE 2018100406 W DE2018100406 W DE 2018100406W WO 2018196926 A1 WO2018196926 A1 WO 2018196926A1
Authority
WO
WIPO (PCT)
Prior art keywords
cable
pulse
data
tested
impedance
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.)
Ceased
Application number
PCT/DE2018/100406
Other languages
German (de)
English (en)
Inventor
Alexander Neumeier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lisa Draexlmaier GmbH
Original Assignee
Lisa Draexlmaier GmbH
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 Lisa Draexlmaier GmbH filed Critical Lisa Draexlmaier GmbH
Publication of WO2018196926A1 publication Critical patent/WO2018196926A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
    • 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
    • G01R27/04—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant in circuits having distributed constants, e.g. having very long conductors or involving high frequencies
    • G01R27/06—Measuring reflection coefficients; Measuring standing-wave ratio
    • 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
    • G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58—Testing of lines, cables or conductors

Definitions

  • the present invention relates to a test device for spatially resolved
  • VNA vectorial network analyzers
  • An object of the invention is therefore to provide a cost-effective quality control for data lines using structurally simple means as possible, which can be used as an end-of-line test.
  • test device for the spatially resolved impedance measurement of
  • Data cables for a vehicle include a pulse cable, a voltage source for charging the pulse cable via a (high resistance) resistor, a switch adapted to connect the pulse cable to a data cable to be tested, to connect the (charged) pulse cable to the data cable to be tested a measuring device for measuring a voltage curve between the pulse cable and the data cable to be tested, while the pulse cable is discharged onto the data cable to be tested, and a
  • Evaluation device which is set up to evaluate the voltage profile in order to determine a point of disturbance spatially resolved.
  • an industrial end-of-line (EOL) test of one or more RF parameters becomes possible.
  • EOL end-of-line
  • a spatially resolved measurement of the impedance in the industrial environment places very high demands on the robustness of the measuring device and on the measuring method.
  • the test device By means of the test device, a quality assurance of data lines in the cable harnesses is achieved.
  • Data cable is generated by the discharge of the pulse cable, a measuring pulse.
  • the measuring pulse is a kind of step function, ie the voltage changes with a slope as steep as possible from a first voltage level to a second voltage level.
  • the measuring pulse is also referred to as the discharge pulse.
  • the impurity is also called an error. Under one Defect can be a pinch, a de-twist, a cable break, a kink in the data cable or the like understood.
  • An impurity alters the characteristic impedance of the data cable and has a negative impact on data transmission.
  • the physical defect is detected in the physical layer and not only indirectly by an evaluation of protocol messages or error codes of transmitted data.
  • the pulse cable is designed as a coaxial cable, in particular as a single-ended coaxial cable, preferably with a wave impedance of 50 ohms, 60 ohms or 75 ohms ( ⁇ ). This is also referred to as a 50 ohm coaxial cable or equivalent.
  • a coaxial cable in addition to the suitability for charging also that this neither radiates energy nor absorbs and therefore does not cause additional interference.
  • the characteristic impedance of the pulse cable is known.
  • the Pulshack can be rolled up.
  • the pulse cable may be rigid.
  • the pulse cable can, for example, extend linearly in a test system in production on a hall ceiling.
  • the data cable to be tested may be a coaxial cable and, additionally or alternatively, a cable with twisted pair conductors.
  • a twisted pair cable is also referred to as a UTP cable or "twisted pair".
  • "Twisted Pair" is the English term for a copper cable with crossed, twisted or stranded wire pairs. Cables with stranded wire pairs have been used for a long time in signal and data transmission. It is technically correct when one speaks of stranding or twisted wire pairs.
  • an impedance varying by an uneven lay length can be detected in a spatially resolved manner so that information can be returned to the production process to increase quality.
  • UTP cables are split into three groups: S / UTP with braided shield, F / UTP with foil shielding, and SF / UTP with combined braid / foil shielding.
  • S / UTP cables have a total screen for all twisted wire pairs.
  • Such shielding, as braided or foil shielding improves the spurious characteristics but has no influence on near-end crosstalk attenuation (NEXT).
  • NEXT near-end crosstalk attenuation
  • the UTP cable has 100 ohm impedance, but there are some countries in which an impedance of 120 ohms is preferred. The impedance may deviate over the specified frequency range by up to ⁇ 15% from the nominal value.
  • balun In order to connect in the scholarvorric device designed as a coaxial cable charging cable with a designed as a UTP cable data cable, a so-called balun is preferably arranged between them.
  • the word Balun is composed of the English words “balanced” and “unbalanced”. In electrical engineering and high-frequency engineering, Balun is a component for the conversion between a symmetrical one
  • balun Line system and an unbalanced line system.
  • a balun is also called a balun. Baluns work in both directions, so the term “unbalance circuit” does not exist. "Symmetrical" means that there are two anti-phase AC voltages that are equal to ground potential, and unbalanced signal transmission is essentially via coaxial cable or stripline
  • baluns can be used, which operate on the principle of the standing wave barrier.
  • balun circuit with a corresponding impedance transformation
  • a 2: 1 impedance transformation for example with a 2: 1 impedance transformation
  • the balun may have a 50 ohm unbalanced input impedance and a 100 ohm differential output impedance. Under an unbalanced
  • Input impedance can be understood as an input that is single-ended or single-pole grounded.
  • an electrical length of the pulse cable is longer than an electrical length of the data cable to be tested. If the pulse cable and the data cable have a comparable dielectric conductivity or permittivity ⁇ , then preferably the length of the pulse cable is greater than the length of the data cable to be tested. With increased dielectric conductivity, the pulse cable can be correspondingly shorter. If the pulse cable has a greater electrical length than the data cable, first a reflection of the discharge pulse will show the end of the data cable before a similar one
  • Signal influence is to be measured conditionally by the pulse cable.
  • the evaluation device can be a comparator and additionally or alternatively an analog / digital converter (A / D converter) in combination with a processing device such as For example, a microprocessor ( ⁇ ⁇ 3) or digital signal processor (DSP) include.
  • a / D converter analog / digital converter
  • a processing device such as For example, a microprocessor ( ⁇ ⁇ 3) or digital signal processor (DSP) include.
  • ⁇ ⁇ 3 microprocessor
  • DSP digital signal processor
  • the voltage curve can be compared with a reference signal. If the voltage profile deviates more than a predetermined tolerance range from the reference signal, an error can be detected.
  • the tolerance range may be, for example, 10% or less. So can over the predefined tolerance range and the
  • Reference signal, a threshold or a threshold signal are formed, which is compared by means of the comparator with the voltage curve. If the threshold value or the threshold value signal is exceeded or not reached, then an error is detected and provided as an error signal. Alternatively, the reference signal can be used directly as a threshold signal and an error can be displayed if it is exceeded or not reached. If an A / D converter, also referred to as ADC, is used, the comparison can be made digitally or via software functions. In addition, a time of the fault or a time interval from the start of the pulse wave to exceeding the predetermined tolerance to the reference signal can be determined via a counter or timer module or via the time information of the A / D converter. A time interval determined in this way correlates with a location information, since a propagation speed of the pulse wave in the data cable is defined from the cable parameters, whereby from the
  • the location information can be determined as a distance.
  • the test device or the evaluation device can be calibrated with a good data cable and the other measured values can be normalized to this "good" data cable. So all systematic effects can be eliminated.
  • a deviation of voltage values (over time) from the data cable used for calibration can be used as an error threshold, optionally supplemented by a correction value or tolerance range.
  • the measuring device can be set up to detect the voltage curve of the discharge pulse with at least 200 MHz.
  • the measuring device may have a minimum sampling frequency of 200 MHz.
  • a minimum sampling frequency of 500 MHz is preferred.
  • the resistance is also colloquially referred to as a high-resistance resistor, since its resistance value is greater than the characteristic impedance of the pulse cable to be charged.
  • the high-resistance resistor has a resistance value greater than Characteristic impedance of the pulse cable. So the resistance can in particular one
  • the resistance value of the (high-resistance) resistor may be at least 200 times the characteristic impedance of the pulse cable.
  • the charging resistance is also required by the
  • the inventive idea can also be used in a spatially resolved process
  • the method includes loading, connecting, measuring and evaluating steps configured to charge the pulse cable, connect to the data cable, and then acquire and evaluate the voltage history of the discharge pulse over time to evaluate the impedance and an error to recognize.
  • FIG. 1 shows a simplified circuit diagram of a test device for spatially resolved
  • Fig. 2 is a simplified circuit diagram of a test device for spatially resolved
  • the data cable 102 may be a data cable 102 of an on-board network for a vehicle.
  • the data cable 102 in an alternative embodiment is a data cable 102 in a home installation or a data cable 102 of an infrastructure.
  • the test apparatus 100 will be described using the example of a data cable 102, which is used in a vehicle electrical system. However, this is not intended to limit the field of application of the presented test apparatus 100 exclusively to this intended use, even if a meaningfully verifiable length of the data cable 102 is limited by the test apparatus 100, as will be explained below.
  • the test apparatus 100 comprises a voltage source 104, a high-impedance resistor 106, a pulse cable 108, a
  • the voltage source 104 is connected to ground GND and to an input of the resistor 106.
  • An output of the resistor 106 is connected to the pulse cable 108.
  • a shield 1 14 of the pulse cable 108 is connected to ground GND.
  • a side facing away from the resistor 106 of the pulse cable 108 is connected via the switch 1 10 to the data cable 102.
  • the data cable 102 is a coaxial cable.
  • a shield 16 of the data cable 102 is connected to ground GND.
  • the measuring device 1 12 is arranged to evaluate a current from the pulse cable 108 in the data cable 102 discharge pulse 1 18 as a voltage waveform 120.
  • the switch 110 is configured to connect the pulse cable 108 to the data cable 102 in order to discharge the pulse cable 108 charged via the voltage source 104 to the data cable 102 to be tested.
  • the measuring device 1 12 is adapted to a Voltage 120 to measure. In this case, a comparison with a reference signal either in the analog range by means of a comparator or in the digital range by means of a corresponding evaluation device 122 can be understood by the measurement.
  • the evaluation device 122 is designed to evaluate the voltage curve 120 in order to detect an impurity in the data cable 102.
  • the measuring device 12 comprises a comparator (not shown) and optionally a counter (not shown) or alternatively an analog-to-digital converter (not shown) in combination with a microprocessor (not shown) to detect an error in the data cable 102 to recognize.
  • test apparatus 100 is configured to perform the
  • the reference signal 124 is located at a first input of a
  • the voltage waveform 120 is located at a second input of the
  • the reference signal 124 corresponds to a setpoint comprising a tolerance range as maximum value or minimum value. As can be seen from FIGS. 3 and 4, this is preferably a maximum value, so that an error is detected when the voltage profile 120 exceeds the reference signal 124.
  • Evaluation device 122 additionally a counter, not shown. This is started with the first edge of the voltage curve 120, d. H. with the start of the discharge pulse 1 18. The counter is stopped at the moment when the voltage waveform 120 the
  • Reference signal 124 exceeds. From the information of the thus determined time span and the signal speed in the data cable 102, the location of the fault can be determined simply and precisely. As can be seen from FIG. 3 and FIG. 4, a first error possibly masks further errors that occur later, so that they can not always be reliably detected. For this purpose, a special consideration of a severity of the error occurred makes sense. However, this is not possible by means of the described comparator. Therefore, in a preferred embodiment, the voltage waveform 120 is digitized by means of an analog-to-digital converter and evaluated by means of a microprocessor, wherein the
  • Voltage waveform 120 is compared with a (virtual) reference signal 124.
  • a (virtual) reference signal 124 provides an absolute or relative deviation from the setpoint determinable, wherein the absolute or relative deviation correlates with a severity of the error.
  • An optimum sampling frequency of the analog-to-digital converter should be greater than 100 MHz, preferably a sampling frequency of at least 500 MHz, in order to achieve a corresponding spatial resolution; For an error estimation, a resolution of 8 bits is sufficient for the
  • the resistance of the resistor 106 is greater than the characteristic impedance of the pulse cable 108. If the pulse cable 108 has a characteristic impedance of 50 ohms, a resistance of at least 10 kohms, preferably at least 20 kohms, more preferably at least 100 kohms for the resistor 106
  • the test apparatus 100 is configured to contact the data cable 102 on one side.
  • the pulse cable 108 is formed as a coaxial cable.
  • the wave impedance of the coaxial cable is in a further, particularly preferred embodiment 50 ohms.
  • the electrical length of the data cable 102 is shorter than the electrical length of the
  • Pulse cables 108 When the data cable 102 is a coaxial cable similar to the pulse cable 108, i. H. with approximately identical physical
  • the physical length of the pulse cable 108 is longer than the physical length of the data cable 102.
  • the pulse cable 108 is at least 10% longer than the test to be tested
  • the embodiment shown in Fig. 2 differs from the embodiment shown in Fig. 1 in particular in that it is the data cable 102 instead of a coaxial cable is a cable with two stranded wires. Therefore, the unbalanced discharge pulse 1 18 must be converted by means of a balun 230 into a symmetrical discharge pulse 232. At the same time, the balun 230 is preferred equipped, the input side to the impedance of the pulse cable 108 and the output to be adapted to the impedance of the connected data cable 102 and the
  • the balun has a 50 ohm unbalanced input impedance and a 100 ohm differential output impedance. Because of its function, one
  • balun is also referred to as a balun.
  • the symmetrical discharge pulse runs on the data cable 102 to be tested.
  • the voltage curve 120 is monitored between the switch 110 and the balun 230.
  • an RG58C / U coaxial cable is used with a
  • the pulse cable 108 is charged with a voltage of 20 V via a high-impedance resistor 106 having a resistance of 100 kOhm.
  • the pulse cable can be discharged, for example, via a 50 ohm termination resistor. It can be seen that the voltage during discharge at half of the source voltage, d. H. 10 V due to the voltage divider between
  • Characteristic impedance of the pulse cable 108 and discharge resistance is proportional to the length of the pulse cable 108 with a constant of about 10 ns per meter in reflection.
  • Fig. 3 shows four different voltage waveforms 120 recorded with a test apparatus 100 corresponding to Fig. 2, wherein the data cable 102 to be tested is a UTP cable, ie a paired cable, or the English term "unshielded twisted pair "Cable with a length of 5 m and a characteristic impedance of 100 ohms nominal and with three waveforms 120", 120 '", 120””an increasing untwisting was introduced as a mistake.
  • the reference or comparison quantity is an error-free data cable 102 and a waveform 120 'derived therefrom.
  • the abscissa shows the time in nanoseconds [ns] and the ordinate the voltage in volts [V].
  • the voltage is 0 V and then rises to 1.6 V with a strong rising edge. In this case, a slight transient between 1, 3 V and 1, 7 V can be seen until about 10 ns. The error can be seen in the period between about 24 ns and 28 ns, with a maximum at about 26 ns.
  • the first Voltage profile 120 ' has no error
  • the second voltage curve 120 has a deduction of 10 mm
  • the third voltage curve 120'" has a untwisting of 30 mm
  • the fourth voltage curve 120 "" has a untwisting of 50 mm.
  • the voltage of the fourth voltage waveform 120 "" at the time of the fault rises to 1.75 V, which means a deviation to over 108% of the comparison signal 120 ', as can be seen from FIG.
  • the second voltage curve 120 "and the third voltage curve 120 '" are correspondingly in between and have a deviation of approximately 1.5% and just under 4%, respectively.
  • the time-dependent (spatially resolved) impedance can be calculated directly from the voltage curve of the discharge pulse according to the following formula:
  • the characteristic of the balun must be taken into account when calculating the impedance.
  • the spatially resolved impedance curves can be calculated from the propagation velocity in the cable from the time-resolved impedance curves according to the formula below.
  • the factor two by the reflection signal is to be considered.
  • Fig. 5 shows a method for the spatially resolved impedance measurement of data cables for a vehicle.
  • the method comprises the following steps: Load S1, connect S2, measure S3 and evaluate S4.
  • step S1 of charging a pulse cable is charged via a resistor.
  • the charged pulse cable is connected in step S2 via a switch with a data cable to be tested in order to discharge the (charged) pulse cable onto the data cable to be tested (with a discharge pulse).
  • step S3 a voltage waveform is measured between the pulse cable and the data cable to be tested when the pulse cable is discharged onto the data cable to be tested.
  • Voltage curve evaluated to determine an impurity An evaluation of the time course is to determine a spatial resolution.

Landscapes

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

Abstract

L'invention concerne un dispositif de contrôle (100) pour la mesure d'impédance à résolution spatiale de câbles de données (102) pour un véhicule. Le dispositif de contrôle (100) comprend un câble à impulsions (108) ; une source de tension (104) destinée à charger le câble à impulsions (108) à travers une résistance (106) fortement ohmique ; un commutateur (110) qui sert à relier le câble à impulsions (108) à un câble de données (102) à contrôler afin de décharger le câble à impulsions (108) chargé dans le câble de données (102) à contrôler ; un dispositif de mesure (112) destiné à mesurer une courbe de tension (120) entre le câble à impulsions (108) et le câble de données (102) à contrôler, lors de la décharge du câble à impulsions (108) dans le câble de données (102) à contrôler ; et un dispositif d'évaluation (122) qui sert à évaluer la courbe de tension (120) pour déterminer un défaut avec une résolution spatiale.
PCT/DE2018/100406 2017-04-26 2018-04-26 Dispositif de contrôle et procédé de mesure d'impédance à résolution spatiale de câbles de données pour un véhicule Ceased WO2018196926A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017108955.1A DE102017108955A1 (de) 2017-04-26 2017-04-26 Prüfvorrichtung und verfahren zur ortsaufgelösten impedanzmessung von datenkabeln für ein fahrzeug
DE102017108955.1 2017-04-26

Publications (1)

Publication Number Publication Date
WO2018196926A1 true WO2018196926A1 (fr) 2018-11-01

Family

ID=62142944

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2018/100406 Ceased WO2018196926A1 (fr) 2017-04-26 2018-04-26 Dispositif de contrôle et procédé de mesure d'impédance à résolution spatiale de câbles de données pour un véhicule

Country Status (2)

Country Link
DE (1) DE102017108955A1 (fr)
WO (1) WO2018196926A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115801649A (zh) * 2022-11-01 2023-03-14 一汽解放汽车有限公司 一种线束测试系统和方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017122692A1 (de) 2017-09-29 2019-04-04 Lisa Dräxlmaier GmbH Prüfvorrichtung und Prüfverfahren zum Prüfen eines Datenkabels für ein Kraftfahrzeug mittels differenzieller Spannungspegel
DE102017122684A1 (de) 2017-09-29 2019-04-04 Lisa Dräxlmaier GmbH Prüfvorrichtung und prüfverfahren zum prüfen eines datenkabels für ein kraftfharzeug mittels konstantstromquelle
CN118465421B (zh) * 2024-07-15 2024-11-05 中汽研新能源汽车检验中心(天津)有限公司 车辆测试系统、pwm信号发生装置的控制方法、控制装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1508351A (en) * 1976-01-16 1978-04-26 Electricity Council Apparatus for the location of faults in cables
DE4335924C1 (de) * 1993-10-21 1995-01-05 Hagenuk Telecom Gmbh Verfahren und Vorrichtung zur Ortung von Kabelfehlern
EP0784210A2 (fr) * 1996-01-10 1997-07-16 Sumitomo Wiring Systems, Ltd. Appareil pour détecter l'endroit d'un défaut dans un faisceau de câbles
US6259256B1 (en) * 1999-03-01 2001-07-10 Nordx/Cdt, Inc. Cable testing apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0326649A3 (fr) * 1988-02-04 1990-02-07 Hewlett-Packard Company Condensateur blindé à absorption diélectrique faible

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1508351A (en) * 1976-01-16 1978-04-26 Electricity Council Apparatus for the location of faults in cables
DE4335924C1 (de) * 1993-10-21 1995-01-05 Hagenuk Telecom Gmbh Verfahren und Vorrichtung zur Ortung von Kabelfehlern
EP0784210A2 (fr) * 1996-01-10 1997-07-16 Sumitomo Wiring Systems, Ltd. Appareil pour détecter l'endroit d'un défaut dans un faisceau de câbles
US6259256B1 (en) * 1999-03-01 2001-07-10 Nordx/Cdt, Inc. Cable testing apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TOMI ENGDAHL: "Time Domain Reflectometer (TDR)", 31 December 2010 (2010-12-31), XP002782899, Retrieved from the Internet <URL:http://www.epanorama.net/circuits/tdr.html> [retrieved on 20180709] *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115801649A (zh) * 2022-11-01 2023-03-14 一汽解放汽车有限公司 一种线束测试系统和方法
CN115801649B (zh) * 2022-11-01 2024-05-28 一汽解放汽车有限公司 一种线束测试系统和方法

Also Published As

Publication number Publication date
DE102017108955A1 (de) 2018-10-31

Similar Documents

Publication Publication Date Title
EP2482089B1 (fr) Procédé et système de localisation d&#39;une erreur sur un câble
CH682770A5 (de) Vorrichtung zum Prüfen der Isolierung eines elektrischen Leiters.
WO2018196926A1 (fr) Dispositif de contrôle et procédé de mesure d&#39;impédance à résolution spatiale de câbles de données pour un véhicule
DE4329382A1 (de) Verfahren und Vorrichtung zur Erfassung von Erdfehlern auf den Leitern einer elektrischen Maschine
DE2404223A1 (de) Verfahren zur messung von teilentladungen und zur ortung von fehlstellen in der isolierung von isolierten leitern
EP2516313A2 (fr) Surveillance d&#39;un moyen de support et d&#39;entraînement d&#39;un système d&#39;ascenseur
EP3074781A1 (fr) Procédé et dispositif de localisation de décharges partielles dans des câbles électriques
EP1090303B1 (fr) Procede et dispositif pour la surveillance d&#39;une ligne d&#39;electrode d&#39;une installation bipolaire de transport de courant continu a haute tension (c.c.h.t)
WO2013014249A1 (fr) Procédé d&#39;adaptation d&#39;un capteur d&#39;arc électrique
DE102017116613B3 (de) Verfahren und Prüfvorrichtung zur Messung von Teilentladungsimpulsen eines geschirmten Kabels
DE10136344A1 (de) Verfahren zur Fehlerortnung insbesondere an verzweigten Nieder-und Mittelspannungsnetzen und hierfür verwendete Auswerteschaltung
AT523525B1 (de) Elektrische Schaltungsanordnung
DE102017108954A1 (de) Prüfvorrichtung und verfahren zur impedanzmessung von datenkabeln für ein fahrzeug
WO2009046751A1 (fr) Procédé pour déterminer la répartition de température le long d&#39;un conducteur
EP3269015B1 (fr) Procédé de détermination d&#39;état et de localisation de défauts sur des dérivations isolées installées dans un système de protection extérieure contre la foudre
EP3462195B1 (fr) Dispositif de vérification et procédé de vérification destinés à vérifier un câble de données pour un véhicule automobile à l&#39;aide d&#39;une source de courant constant
WO2019179645A1 (fr) Procédé et ensemble de mesure destiné à la détection d&#39;une perturbation électromagnétique sur l&#39;âme dun conducteur électrique
DE3237895A1 (de) Kabelfehler-ortungsverfahren fuer unterbrechungen mit feuchtigkeitskompensation
AT522128B1 (de) Überprüfen von Mantelspannungsbegrenzern
EP2553477B1 (fr) Dispositif et procédé de diagnostic d&#39;objets de mesure en utilisant une tension de mesure
DE102020129825A1 (de) Verfahren zur Vermeidung einer Kollision bei der Messung der Schleifenimpedanz durch mehrere Teilnehmer
EP0927356B1 (fr) Procede de verification de composants electriques et dispositif permettant de mettre ledit procede en oeuvre
DE102017122692A1 (de) Prüfvorrichtung und Prüfverfahren zum Prüfen eines Datenkabels für ein Kraftfahrzeug mittels differenzieller Spannungspegel
WO2025214942A1 (fr) Appareil d&#39;essai mobile et procédé pour réaliser l&#39;essai d&#39;un objet d&#39;essai, en particulier d&#39;un câble haute ou moyenne tension
CH711878B1 (de) Verfahren und Vorrichtung zum Bestimmen des spezifischen Längenwiderstandes einer mehrdrähtigen Leitung.

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18723399

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 18723399

Country of ref document: EP

Kind code of ref document: A1