EP2939032A1 - Measuring tip - Google Patents

Measuring tip

Info

Publication number
EP2939032A1
EP2939032A1 EP13818659.8A EP13818659A EP2939032A1 EP 2939032 A1 EP2939032 A1 EP 2939032A1 EP 13818659 A EP13818659 A EP 13818659A EP 2939032 A1 EP2939032 A1 EP 2939032A1
Authority
EP
European Patent Office
Prior art keywords
measuring
conductors
conductor
contact
base body
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.)
Withdrawn
Application number
EP13818659.8A
Other languages
German (de)
French (fr)
Inventor
Roland NEUHAUSER
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.)
Rosenberger Hochfrequenztechnik GmbH and Co KG
Original Assignee
Rosenberger Hochfrequenztechnik GmbH and Co KG
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 Rosenberger Hochfrequenztechnik GmbH and Co KG filed Critical Rosenberger Hochfrequenztechnik GmbH and Co KG
Publication of EP2939032A1 publication Critical patent/EP2939032A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/02—General constructional details
    • G01R1/06—Measuring leads; Measuring probes
    • G01R1/067—Measuring probes
    • G01R1/06772—High frequency probes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/02—General constructional details
    • G01R1/06—Measuring leads; Measuring probes
    • G01R1/067—Measuring probes
    • G01R1/06711—Probe needles; Cantilever beams; "Bump" contacts; Replaceable probe pins
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R3/00—Apparatus or processes specially adapted for the manufacture or maintenance of measuring instruments, e.g. of probe tips

Definitions

  • the invention relates to a measuring tip and a system for variable design of such a measuring tip.
  • Measuring probes are used, for example, to test the functionality and the electrical properties of printed circuit boards, for which purpose they are connected via connecting contacts to a suitable measuring device.
  • Generic measuring tips for this purpose comprise at least one main body having a supporting function, to which at least two measuring conductors, regularly in the form of contact fingers projecting freely into the room, are fastened.
  • the measuring conductors are electrically or directly connected directly to the terminal contacts likewise fastened to the base body.
  • Such a measuring tip is known, for example, from EP 2 409 166 B1.
  • the measuring conductors are connected in a coplanar orientation firmly with one or two insulating parts.
  • This solid compound is done in practice regularly by gluing.
  • the unit of measuring conductors and insulating part (s) is arranged in a recess of the base body and firmly connected thereto. This solid connection is in practice regularly Soldering or welding realized.
  • the measuring tip is placed on it so that the measuring conductors contact the printed conductors of the printed circuit board at defined locations.
  • measuring tips are configured with regard to the number and arrangement of the measuring conductors and their electrical connection with the connecting contacts to a specific measuring project.
  • measuring tips for different measuring projects can differ, in particular with regard to the number of measuring conductors, the distance of the measuring conductors from one another (the so-called "pitch") and the connection of the individual measuring conductors to either the signal-carrying connection contact or the ground potential-having connection contact coplanar measuring conductors, in which the outer measuring conductors are connected via the electrically conductive main body to the ground potential terminal and the middle measuring conductor to the signal - carrying terminal contact.
  • This design of a measuring tip is also referred to as "GSG", where "G” for "ground” and “S” stands for "signal”.
  • GSG for probe tips with two contact fingers, both possible configurations are common, i.e., "GS" and "SG”.
  • the present invention seeks to reduce the costs associated with the use of generic measuring tips.
  • a generic measuring tip comprises (at least) one main body, at least two measuring conductors connected to the main body and at least two connecting conductors, wherein a first connecting conductor is electrically conductively connected to a first of the measuring conductors and a second connecting conductor to a second of the measuring conductors.
  • a generic measuring tip is further developed in that the measuring conductors are fastened to a support element and the support element is removably fastened to the basic body by means of releasable fastening means.
  • the base body can be used with the connection contacts for the construction of different, adapted to different measurement purposes measuring tips.
  • an exchange of the body with the terminal contacts is not required, just because the measuring conductors are worn or damaged.
  • the fastening means do not have to attack the measuring conductors, which would be consuming (but basically possible) because of the regularly very delicate dimensions of the measuring conductors.
  • this can simplify the manufacture of the measuring tip, since the exact positioning of the measuring conductors relative to one another, which is relevant to the function of the measuring tip, can advantageously be carried out in advance, ie before the measuring unit is mounted on the basic body.
  • a system according to the invention for forming a measuring tip according to the invention which is changeable, inter alia, with respect to the measuring conductor configuration, accordingly comprises a plurality of measuring units each comprising the measuring conductors and the supporting element, all measuring units being fastenable to the (one) main body of the measuring tip by means of the fastening means.
  • the measuring units may differ in the number and / or arrangement of the ladder. But these can also be the same and then serve only the purpose of an exchange due to wear or damage.
  • connection conductors are preferably designed in the form of a coaxial conductor with (at least) one inner conductor and (at least) an outer conductor surrounding the inner conductor and electrically insulated from it by (at least) one dielectric.
  • a coaxial conductor is advantageously suitable for transmitting high-frequency signals, even in high frequency ranges. This applies in particular if, as is preferably provided, the inner conductor serves as a signal conductor and the outer conductor has ground potential.
  • the coaxial conductor of the measuring tip (in one end portion) is formed as a coaxial connector, which allows a simple and fast connection of the measuring tip with a measuring device, in particular with the interposition of a equipped with a mating connector coaxial cable or rigid coaxial.
  • the measuring conductors project beyond the support element and preferably also the base body and form contact points for contacting measuring points of an electronic component to be tested at their tips projecting freely into the space.
  • the measuring conductors which are preferably formed of an electrically conductive material, in particular metal (s), can be deflected elastically upon contact with the measuring points of the component to be tested, which can ensure reliable contact.
  • the fastening means include (at least) a screw, as can be realized by screwing both an immovable and permanent mechanical connection (with a correspondingly good electrical contact) and a simple and quick replaceability.
  • a screw as can be realized by screwing both an immovable and permanent mechanical connection (with a correspondingly good electrical contact) and a simple and quick replaceability.
  • any other fastening means can be used, such as latching connections.
  • the measuring conductors are attached to a printed circuit board.
  • a printed circuit board i.e., printed circuit board traces.
  • a direct contact of the main body and / or the connection conductor with the measuring conductors can be avoided. This is particularly advantageous because it can be achieved in a simple manner a uniform connection interface even with different Meßleiterkonfigurationen.
  • the electrical connection between the measuring conductors and the connecting conductors in each connecting path may further be preferred for the electrical connection between the measuring conductors and the connecting conductors in each connecting path to comprise at least one contact spring clip, i. a spring-mounted contact element, which contacts a mating contact element with a conditional by a spring deflection contact pressure includes. This can avoid that possible positioning tolerances result as a result of the replaceable attachment of the measuring unit to the base body to poor transmission performance.
  • the contact spring tabs are assigned to the base body and / or the connecting conductors or solidified on this.
  • the mating contact elements of the measuring unit can be simple, in particular as sections of conductor tracks in the form of a Printed circuit board formed support member may be formed.
  • a further preferred embodiment of the measuring tip according to the invention can provide that the contact points, which are provided for contacting the main body and / or the coaxial conductor, are arranged on a first side of the support element and the measuring conductors on a second, preferably opposite side of the support element , It can thereby be achieved that the measuring conductors are arranged with their contact points as possible edge side of the body, whereby a comparatively large, limited by an unwanted contact of the body with the electronic component to be tested freedom of movement for the measuring tip can be realized.
  • FIG. 1 shows a measuring tip according to the invention in a first perspective view
  • FIG. 2 shows the measuring tip according to FIG. 1 in a second perspective illustration
  • FIG. 3 the measuring tip according to FIGS. 1 and 2 in a longitudinal section
  • FIGS. 1 to 3 shows a part of the measuring tip according to FIGS. 1 to 3 in an exploded view.
  • the measuring tip shown in the drawings comprises a main body 1. This may be formed, for example, brass. At a rear end, the main body 1 has three mounting openings 2, by means of which the measuring tip can be attached to a structure, not shown, for example, a robot arm. At a front end of the main body forms a recess 3, which is the Recording a measuring unit is used.
  • the measuring unit comprises a plurality of, in the present embodiment, three coplanar measuring conductors 4 made of metal, which are arranged at defined distances from one another and fixedly attached to a lower side of a printed circuit board 5.
  • the measuring conductors 4 are electrically isolated from each other. The attachment of the measuring conductor 4 is carried out by soldering.
  • About (not shown) conductor tracks of the circuit board 5, the three measuring conductors 4, each having a contact region 6 on the top of the circuit board 5 are electrically connected.
  • the circuit board 5 also forms in its support plate two passage openings 7, which serve to receive screws 8, via which the measuring unit is exchangeably attached to the main body 1 or can be. For this purpose, the screws 8 are screwed into corresponding threaded bores of the main body 1.
  • the main body 1 also has a receiving opening 9, which serves to receive a coaxial conductor.
  • the coaxial conductor comprises an inner conductor 10 and an outer conductor 1 1, which is arranged at a distance from the inner conductor 10.
  • a support 12 of electrically insulating material secures the relative position of inner conductor 10 and outer conductor 11.
  • air serves as a dielectric.
  • the coaxial conductor forms a (coaxial) connector. This serves to receive a coaxial mating connector, which may be arranged, for example, at one end of a coaxial cable (not shown), via which the measuring tip can be electrically connected to a measuring device, not shown.
  • the outer conductor 1 1 of the coaxial conductor is in direct contact with the base body 1, is thus electrically connected thereto.
  • the inner conductor 10, which extends through the stepped receiving opening to the recess 3, is in the portion in which it is no longer surrounded by the outer conductor 1 1, isolated from the base body 1 by means of air as a dielectric. In the region of the depression 3, the inner conductor 10 directly contacts the middle of the contact regions 6 of the printed circuit board 5.
  • the two outer contact regions 6, on the other hand, contact the main body 1 directly.
  • contact via contact spring tabs can also be provided. which are advantageously connected to the base body 1, make to ensure a secure contact even with tolerance-related positional deviations of circuit board 5 and body 1.
  • the contacting of the inner conductor 10 with the central contact region 6 can take place by means of one or more contact spring tabs, which are preferably fastened to the inner conductor 10.
  • the middle measuring conductor 4, the middle contact region 6, the connecting conductor of the printed circuit board 5 and the inner conductor 10 of the coaxial conductor are provided as part of a signal path during the use of the measuring tip during the testing of an electronic component.
  • the outer measuring conductors 4, the outer contact regions 6, the connecting tracks of the printed circuit board 5, the base body 1, and the outer conductor 1 1 of the coaxial conductor have ground potential.
  • the measuring tip shown in the drawings is thus designed in a so-called "GSG" configuration of its measuring conductors.
  • the measuring conductors 4 project beyond the printed circuit board 5 and thus also the main body 1 and thus protrude freely into the room. As a result, they can deflect individually elastically in their individual contact with defined measuring points of the component to be tested. As a result, secure contact of all measuring conductors 4 with the measuring points is achieved even with a slightly twisted position of the measuring tip to the electronic component.
  • the embodiment of the measuring tip according to the invention makes it possible to quickly and easily replace the measuring unit with an identical or different measuring unit. This can be useful, for example, if for a new measurement project another configuration of the measuring head. 4 is required or a measuring unit has to be replaced due to wear of the measuring head 4.
  • the main body 1 together with the coaxial conductor can continue to be used.
  • the interchangeability of the measuring unit is ensured by the fact that the printed circuit boards 5 of all provided measuring units identically arranged through holes 7 and 6 contact areas (where they are needed) to ensure the combination with the same unit of base 1 and coaxial.

Abstract

The present invention relates to a measuring tip comprising a base body, at least two measuring conductors that are connected to the base body, and at least two connecting conductors, a first connecting conductor being electrically conductively connected to one first measuring conductor of the measuring conductors and a second connecting conductor being electrically conductively connected to one second measuring conductor of the measuring conductors, the measuring conductors being fastened on a support element, and the support element being fastened on the base body by means of detachable fastening means so as to be replaceable.

Description

Messspitze  Probe
Die Erfindung betrifft eine Messspitze sowie ein System zur variablen Ausbildung einer solchen Messspitze. The invention relates to a measuring tip and a system for variable design of such a measuring tip.
Messspitzen werden beispielsweise zum Testen der Funktionsfähigkeit und der elektrischen Eigenschaften von Leiterplatten eingesetzt, wozu diese über Anschlusskontakte mit einer geeigneten Messvorrichtung verbunden sind. Measuring probes are used, for example, to test the functionality and the electrical properties of printed circuit boards, for which purpose they are connected via connecting contacts to a suitable measuring device.
Gattungsgemäße Messspitzen umfassen hierzu zumindest einen eine tragende Funktion aufweisenden Grundkörper, an dem mindestens zwei Messleiter, regelmäßig in Form von frei in den Raum ragenden Kontaktfingern, befestigt sind. Die Messleiter sind direkt oder indirekt mit den ebenfalls an dem Grundkörper befestigten Anschlusskontakten elektrisch verbunden. Generic measuring tips for this purpose comprise at least one main body having a supporting function, to which at least two measuring conductors, regularly in the form of contact fingers projecting freely into the room, are fastened. The measuring conductors are electrically or directly connected directly to the terminal contacts likewise fastened to the base body.
Eine solche Messspitze ist beispielsweise aus der EP 2 409 166 B1 bekannt. Dort sind die Messleiter in einer koplanaren Ausrichtung fest mit einem oder zwei Isolierteilen verbunden. Diese feste Verbindung erfolgt in der Praxis regelmäßig durch Verkleben. Die Einheit aus Messleitern und Isolierteil(en) ist in einer Ausnehmung des Grundkörpers angeordnet und fest mit diesem verbunden. Diese feste Verbindung wird in der Praxis regelmäßig durch Verlöten oder Verschweißen realisiert. Such a measuring tip is known, for example, from EP 2 409 166 B1. There, the measuring conductors are connected in a coplanar orientation firmly with one or two insulating parts. This solid compound is done in practice regularly by gluing. The unit of measuring conductors and insulating part (s) is arranged in a recess of the base body and firmly connected thereto. This solid connection is in practice regularly Soldering or welding realized.
Zum Testen der elektronischen Schaltungen einer Leiterplatte wird die Messspitze so auf dieser aufgesetzt, dass die Messleiter die Leiterbahnen der Leiterplatte an definierten Stellen kontaktieren. To test the electronic circuits of a printed circuit board, the measuring tip is placed on it so that the measuring conductors contact the printed conductors of the printed circuit board at defined locations.
Die bekannten Messspitzen sind hinsichtlich der Anzahl und Anordnung der Messleiter sowie ihrer elektrischen Verbindung mit den Anschlusskontakten auf ein bestimmtes Messvorhaben konfiguriert. Konkret können sich Messspitzen für verschiedene Messvorhaben insbesondere hinsichtlich der Anzahl von Messleitern, dem Abstand der Messleiter zueinander (dem sogenannten „Pitch") sowie dem Anschluss der einzelnen Messleiter an entweder den signalführenden Anschlusskontakt oder den Massepotential aufweisenden Anschlusskontakt unterscheiden. Verbreitet sind z.B. Messspitzen mit drei koplanaren Messleitern, bei denen die äußeren Messleiter über den elektrisch leitenden Grundkörper mit dem Massepotential aufweisenden Anschlusskontakt und der mittlere Messleiter mit dem signalführenden Anschlusskontakt verbunden sind. Diese Auslegung einer Messspitze wird auch als„GSG" bezeichnet, wobei„G" für „Ground" und„S" für„Signal" steht. Bei Messspitzen mit zwei Kontaktfingern sind beide möglichen Konfigurationen verbreitet, d.h.„GS" sowie„SG". The known measuring tips are configured with regard to the number and arrangement of the measuring conductors and their electrical connection with the connecting contacts to a specific measuring project. Specifically, measuring tips for different measuring projects can differ, in particular with regard to the number of measuring conductors, the distance of the measuring conductors from one another (the so-called "pitch") and the connection of the individual measuring conductors to either the signal-carrying connection contact or the ground potential-having connection contact coplanar measuring conductors, in which the outer measuring conductors are connected via the electrically conductive main body to the ground potential terminal and the middle measuring conductor to the signal - carrying terminal contact.This design of a measuring tip is also referred to as "GSG", where "G" for "ground" and "S" stands for "signal". For probe tips with two contact fingers, both possible configurations are common, i.e., "GS" and "SG".
Der bekannte Aufbau gattungsgemäßer Messspitzen zwingt dazu, eine komplette Messspitze für jedes Messvorhaben bereitzustellen. Auch muss bei einem Verschleiß der Messleiter die gesamte Messspitze ausgetauscht werden, da ein Austausch von lediglich den Messleitern nicht oder nur unter einem unverhältnismäßigen Aufwand möglich ist. The well-known construction of generic measuring tips forces one to provide a complete measuring tip for each measuring project. Also, in case of wear of the measuring conductors, the entire measuring tip must be replaced, since an exchange of only the measuring conductors is not possible or only at a disproportionate expense.
Ausgehend von diesem Stand der Technik lag der Erfindung die Aufgabe zugrunde, die mit der Verwendung gattungsgemäßer Messspitzen verbundenen Kosten zu senken. Based on this prior art, the present invention seeks to reduce the costs associated with the use of generic measuring tips.
Diese Aufgabe wird durch eine Messspitze gemäß dem unabhängigen Anspruch 1 sowie ein System zur Ausbildung einer solchen Messspitze gemäß dem nebengeordneten Anspruch 8 gelöst. Vorteilhafte Ausgestaltungen davon sind Gegenstand der abhängigen Ansprüche und ergeben sich aus der nachfolgenden Beschreibung der Erfindung. Demnach umfasst eine gattungsgemäße Messspitze (mindestens) einen Grundkörper, mindestens zwei mit dem Grundkörper verbundene Messleiter und mindestens zwei Anschlussleiter, wobei ein erster Anschlussleiter mit einem ersten der Messleiter und ein zweiter Anschlussleiter mit einem zweiten der Messleiter elektrisch leitend verbunden ist. Erfindungsgemäß ist eine solche gattungsgemäße Messspitze dadurch weitergebildet, dass die Messleiter an einem Tragelement befestigt sind und das Tragelement mittels lösbarer Befestigungsmittel auswechselbar an dem Grundkörper befestigt ist. This object is achieved by a measuring tip according to independent claim 1 and a system for forming such a measuring tip solved according to the independent claim 8. Advantageous embodiments thereof are the subject of the dependent claims and will become apparent from the following description of the invention. Accordingly, a generic measuring tip comprises (at least) one main body, at least two measuring conductors connected to the main body and at least two connecting conductors, wherein a first connecting conductor is electrically conductively connected to a first of the measuring conductors and a second connecting conductor to a second of the measuring conductors. According to the invention, such a generic measuring tip is further developed in that the measuring conductors are fastened to a support element and the support element is removably fastened to the basic body by means of releasable fastening means.
Durch die auswechselbare Befestigung des Tragelements an dem Grundkörper besteht die Möglichkeit, die (zumindest) das Tragelement und die daran befestigten Messleiter umfassende Messeinheit ohne wesentlichen Aufwand auszuwechseln, um die Messspitze z.B. an ein anderes Messvorhaben anzupassen oder die Messspitze durch eine gleiche Messspitze auszutauschen, z.B. wenn diese beschädigt oder verschlissen ist. Somit kann der Grundkörper mit den Anschlusskontakten für den Aufbau von verschiedenen, an unterschiedliche Messvorhaben angepassten Messspitzen verwendet werden. Ebenso ist ein Austausch des Grundkörpers mit den Anschlusskontakten nicht erforderlich, nur weil die Messleiter verschlissen oder beschädigt sind. Due to the exchangeable attachment of the support element to the base body, it is possible to replace the (at least) the support element and the measurement leads attached thereto measurement unit without significant effort to the measuring tip, for example. to adapt to another measurement project, or to replace the probe tip with a same probe tip, e.g. if it is damaged or worn. Thus, the base body can be used with the connection contacts for the construction of different, adapted to different measurement purposes measuring tips. Similarly, an exchange of the body with the terminal contacts is not required, just because the measuring conductors are worn or damaged.
Durch die Befestigung der Messleiter an dem Grundkörper mittels des Tragelements wird erreicht, dass die Befestigungsmittel nicht an den Messleitern angreifen müssen, was wegen der regelmäßig sehr filigranen Abmessungen der Messleiter aufwändig (aber grundsätzlich möglich) wäre. Zudem kann sich dadurch die Herstellung der Messspitze vereinfachen, da die exakte Positionierung der Messleiter zueinander, die für die Funktion der Messspitze relevant ist, vorteilhaft vorab, d.h. vor der Montage der Messeinheit an dem Grundkörper, erfolgen kann. Ein erfindungsgemäßes System zur Ausbildung einer erfindungsgemäßen Messspitze, die u.a. hinsichtlich der Messleiterkonfiguration veränderbar ist, umfasst demnach mehrere, jeweils die Messleiter und das Tragelement umfassende Messeinheiten, wobei alle Messeinheiten mittels der Befestigungsmittel an dem (einen) Grundkörper der Messspitze befestigbar sind. Dabei können sich die Messeinheiten in der Anzahl und/oder Anordnung der Leiter unterscheiden. Diese können aber auch gleich sein und dann lediglich dem Zweck eines Austausches aufgrund von Verschleiß oder einer Beschädigung dienen. By attaching the measuring conductors to the base body by means of the support member is achieved that the fastening means do not have to attack the measuring conductors, which would be consuming (but basically possible) because of the regularly very delicate dimensions of the measuring conductors. In addition, this can simplify the manufacture of the measuring tip, since the exact positioning of the measuring conductors relative to one another, which is relevant to the function of the measuring tip, can advantageously be carried out in advance, ie before the measuring unit is mounted on the basic body. A system according to the invention for forming a measuring tip according to the invention, which is changeable, inter alia, with respect to the measuring conductor configuration, accordingly comprises a plurality of measuring units each comprising the measuring conductors and the supporting element, all measuring units being fastenable to the (one) main body of the measuring tip by means of the fastening means. The measuring units may differ in the number and / or arrangement of the ladder. But these can also be the same and then serve only the purpose of an exchange due to wear or damage.
Die Anschlussleiter sind vorzugsweise in Form eines Koaxialleiters mit (mindestens) einem Innenleiter und (mindestens) einem den Innenleiter umgebenden, von diesem über (mindestens) ein Dielektrikum elektrisch isolierten Außenleiter ausgebildet. Ein solcher Koaxialleiter eignet sich vorteilhaft zur Übertragung von Hochfrequenzsignalen auch in hohen Frequenzbereichen. Dies gilt insbesondere, wenn, wie vorzugsweise vorgesehen, der Innenleiter als Signalleiter dient und der Außenleiter Massepotential aufweist. Besonders bevorzugt ist der Koaxialleiter der Messspitze (in einem Endabschnitt) als Koaxialsteckverbinder ausgebildet, was eine einfache und schnelle Verbindung der Messspitze mit einer Messvorrichtung, insbesondere unter Zwischenschaltung eines mit einem Gegensteckverbinders ausgestatteten Koaxialkabels oder starren Koaxialleiters, ermöglicht. Weiterhin bevorzugt kann vorgesehen sein, dass die Messleiter das Tragelement und vorzugsweise auch den Grundkörper überragen und an ihren frei in den Raum ragenden Spitzen Kontaktstellen zur Kontaktierung von Messstellen eines zu prüfenden elektronischen Bauteils ausbilden. Dadurch können die vorzugsweise aus einem elektrisch leitenden Werkstoff, insbesondere Metall(en), ausgebildeten Messleiter bei einem Kontakt mit den Messstellen des zu prüfenden Bauteils elastisch ausgelenkt werden, was einen sicheren Kontakt gewährleisten kann. The connection conductors are preferably designed in the form of a coaxial conductor with (at least) one inner conductor and (at least) an outer conductor surrounding the inner conductor and electrically insulated from it by (at least) one dielectric. Such a coaxial conductor is advantageously suitable for transmitting high-frequency signals, even in high frequency ranges. This applies in particular if, as is preferably provided, the inner conductor serves as a signal conductor and the outer conductor has ground potential. Particularly preferably, the coaxial conductor of the measuring tip (in one end portion) is formed as a coaxial connector, which allows a simple and fast connection of the measuring tip with a measuring device, in particular with the interposition of a equipped with a mating connector coaxial cable or rigid coaxial. Furthermore preferably, it can be provided that the measuring conductors project beyond the support element and preferably also the base body and form contact points for contacting measuring points of an electronic component to be tested at their tips projecting freely into the space. As a result, the measuring conductors, which are preferably formed of an electrically conductive material, in particular metal (s), can be deflected elastically upon contact with the measuring points of the component to be tested, which can ensure reliable contact.
Vorteilhafterweise kann zudem vorgesehen sein, dass die Befestigungsmittel (mindestens) eine Verschraubung umfassen, da sich mittels Verschraubung sowohl eine unbewegliche und dauerhafte mechanische Verbindung (mit einer entsprechend guten elektrischen Kontaktierung) als auch eine einfache und schnelle Auswechselbarkeit realisieren lässt. Selbstverständlich sind aber auch beliebige andere Befestigungsmittel einsetzbar, wie z.B. Rastverbindungen. Advantageously, it can also be provided that the fastening means Include (at least) a screw, as can be realized by screwing both an immovable and permanent mechanical connection (with a correspondingly good electrical contact) and a simple and quick replaceability. Of course, however, any other fastening means can be used, such as latching connections.
Weiterhin bevorzugt kann vorgesehen sein, dass die Messleiter an einer Leiterplatte befestigt sind. Dadurch kann u.a. erreicht werden, dass die Kontaktierung zwischen der Einheit aus Tragelement bzw. Leiterplatte und Messleitern einerseits und dem Grundkörper und/oder den Anschlussleitern andererseits über von der Leiterplatte (d.h. von Leiterbahnen der Leiterplatte) ausgebildete Kontaktbereiche erfolgen kann. Eine direkte Kontaktierung des Grundkörpers und/oder der Anschlussleiter mit den Messleitern kann dadurch vermieden werden. Dies ist insbesondere vorteilhaft, da dadurch auf einfache Weise eine einheitliche Anschlussschnittstelle auch bei unterschiedlichen Messleiterkonfigurationen erreicht werden kann. Um trotz der Auswechselbarkeit der das Tragelement und die Messleiter umfassenden Messeinheit eine reproduzierbar gute Übertragungsleistung zur erreichen, kann weiterhin bevorzugt vorgesehen sein, dass die elektrische Verbindung zwischen den Messleitern und den Anschlussleitern in jedem Verbindungspfad mindestens eine Kontaktfederlasche, d.h. ein federnd gelagertes Kontaktelement, das ein Gegenkontaktelement mit einem durch eine Federauslenkung bedingten Kontaktdruck kontaktiert, umfasst. Dadurch kann vermieden werden, dass mögliche Positionierungstoleranzen infolge der auswechselbaren Befestigung der Messeinheit an dem Grundkörper zu schlechten Übertragungsleistungen führen. Further preferably, it can be provided that the measuring conductors are attached to a printed circuit board. This can u.a. It can be achieved that the contacting between the unit of the printed circuit board and the measuring conductors on the one hand and the main body and / or the connecting conductors on the other hand can take place via contact areas formed by the printed circuit board (i.e., printed circuit board traces). A direct contact of the main body and / or the connection conductor with the measuring conductors can be avoided. This is particularly advantageous because it can be achieved in a simple manner a uniform connection interface even with different Meßleiterkonfigurationen. In order to achieve a reproducibly good transmission performance in spite of the interchangeability of the measuring element comprising the carrier element and the measuring conductors, it may further be preferred for the electrical connection between the measuring conductors and the connecting conductors in each connecting path to comprise at least one contact spring clip, i. a spring-mounted contact element, which contacts a mating contact element with a conditional by a spring deflection contact pressure includes. This can avoid that possible positioning tolerances result as a result of the replaceable attachment of the measuring unit to the base body to poor transmission performance.
Vorzugsweise kann vorgesehen sein, dass die Kontaktfederlaschen dem Grundkörper und/oder den Anschlussleitern zugeordnet bzw. an diesen verfestigt sind. Dadurch können die Gegenkontaktelemente der Messeinheit einfach, insbesondere als Abschnitte von Leiterbahnen des in Form einer Leiterplatte ausgebildeten Tragelements ausgebildet sein. Preferably, it may be provided that the contact spring tabs are assigned to the base body and / or the connecting conductors or solidified on this. As a result, the mating contact elements of the measuring unit can be simple, in particular as sections of conductor tracks in the form of a Printed circuit board formed support member may be formed.
Eine weiterhin bevorzugte Ausgestaltung der erfindungsgemäßen Messspitze kann vorsehen, dass die Kontaktstellen, die zur Kontaktierung des Grundkörpers und/oder des Koaxialleiters vorgesehen sind, auf einer ersten Seite des Tragelements und die Messleiter auf einer zweiten, der ersten Seite vorzugsweise gegenüberliegenden Seite des Tragelements angeordnet sind. Dadurch kann erreicht werden, dass die Messleiter mit ihren Kontaktstellen möglichst randseitig des Grundkörpers angeordnet sind, wodurch eine vergleichsweise große, durch einen ungewollten Kontakt des Grundkörpers mit dem zu prüfenden elektronischen Bauteil eingeschränkte Bewegungsfreiheit für die Messspitze realisiert werden kann. A further preferred embodiment of the measuring tip according to the invention can provide that the contact points, which are provided for contacting the main body and / or the coaxial conductor, are arranged on a first side of the support element and the measuring conductors on a second, preferably opposite side of the support element , It can thereby be achieved that the measuring conductors are arranged with their contact points as possible edge side of the body, whereby a comparatively large, limited by an unwanted contact of the body with the electronic component to be tested freedom of movement for the measuring tip can be realized.
Die Erfindung wird nachfolgend anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels näher erläutert. In den Zeichnungen zeigt: The invention will be explained in more detail with reference to an embodiment shown in the drawings. In the drawings shows:
Fig. 1 : eine erfindungsgemäße Messspitze in einer ersten perspektivischen Darstellung; 1 shows a measuring tip according to the invention in a first perspective view;
Fig. 2: die Messspitze gemäß Fig. 1 in einer zweiten perspektivischen Darstellung; FIG. 2 shows the measuring tip according to FIG. 1 in a second perspective illustration; FIG.
Fig. 3: die Messspitze gemäß den Fig. 1 und 2 in einem Längsschnitt; und FIG. 3: the measuring tip according to FIGS. 1 and 2 in a longitudinal section; and
Fig. 4: einen Teil der Messspitze gemäß den Fig. 1 bis 3 in einer Explosionsdarstellung. 4 shows a part of the measuring tip according to FIGS. 1 to 3 in an exploded view.
Die in den Zeichnungen dargestellte Messspitze umfasst einen Grundkörper 1. Dieser kann beispielsweise aus Messing ausgebildet sein. An einem rückseitigen Ende weist der Grundkörper 1 drei Montageöffnungen 2 auf, mittels derer die Messspitze an einer nicht dargestellten Struktur, beispielsweise einem Roboterarm befestigt werden kann. An einem vorderseitigen Ende bildet der Grundkörper eine Vertiefung 3 aus, die der Aufnahme einer Messeinheit dient. The measuring tip shown in the drawings comprises a main body 1. This may be formed, for example, brass. At a rear end, the main body 1 has three mounting openings 2, by means of which the measuring tip can be attached to a structure, not shown, for example, a robot arm. At a front end of the main body forms a recess 3, which is the Recording a measuring unit is used.
Die Messeinheit umfasst mehrere, im vorliegenden Ausführungsbeispiel drei koplanare Messleiter 4 aus Metall, die in definierten Abständen zueinander angeordnet und fest an einer Unterseite einer Leiterplatte 5 befestigt sind. Die Messleiter 4 sind elektrisch voneinander isoliert. Die Befestigung der Messleiter 4 erfolgt durch Verlöten. Über (nicht dargestellte) Leiterbahnen der Leiterplatte 5 sind die drei Messleiter 4 mit jeweils einem Kontaktbereich 6 auf der Oberseite der Leiterplatte 5 elektrisch verbunden. Die Leiterplatte 5 bildet in ihrer Trägerplatte zudem zwei Durchgangsöffnungen 7 aus, die der Aufnahme von Schrauben 8 dienen, über die die Messeinheit an dem Grundkörper 1 auswechselbar befestigt ist bzw. werden kann. Hierzu werden die Schrauben 8 in entsprechende Gewindebohrungen des Grundkörpers 1 eingeschraubt. The measuring unit comprises a plurality of, in the present embodiment, three coplanar measuring conductors 4 made of metal, which are arranged at defined distances from one another and fixedly attached to a lower side of a printed circuit board 5. The measuring conductors 4 are electrically isolated from each other. The attachment of the measuring conductor 4 is carried out by soldering. About (not shown) conductor tracks of the circuit board 5, the three measuring conductors 4, each having a contact region 6 on the top of the circuit board 5 are electrically connected. The circuit board 5 also forms in its support plate two passage openings 7, which serve to receive screws 8, via which the measuring unit is exchangeably attached to the main body 1 or can be. For this purpose, the screws 8 are screwed into corresponding threaded bores of the main body 1.
Der Grundkörper 1 weist weiterhin eine Aufnahmeöffnung 9 aus, die der Aufnahme eines Koaxialleiters dient. Der Koaxialleiter umfasst einen Innenleiter 10 sowie einen Außenleiter 1 1 , der von dem Innenleiter 10 beabstandet angeordnet ist. In einem Abschnitt des Koaxialleiters sichert eine Stütze 12 aus elektrisch isolierendem Werkstoff die Relativposition von Innenleiter 10 und Außenleiter 1 1 . In den verbliebenen Abschnitten dient Luft als Dielektrikum. An einem steckseitigen Ende bildet der Koaxialleiter einen (Koaxial-) Steckverbinder aus. Dieser dient der Aufnahme eines koaxialen Gegensteckverbinders, der beispielsweise an einem Ende eines Koaxialkabels (nicht dargestellt) angeordnet sein kann, über das die Messspitze mit einer nicht dargestellten Messeinrichtung elektrisch verbunden werden kann. The main body 1 also has a receiving opening 9, which serves to receive a coaxial conductor. The coaxial conductor comprises an inner conductor 10 and an outer conductor 1 1, which is arranged at a distance from the inner conductor 10. In a section of the coaxial conductor, a support 12 of electrically insulating material secures the relative position of inner conductor 10 and outer conductor 11. In the remaining sections, air serves as a dielectric. At a plug-in end, the coaxial conductor forms a (coaxial) connector. This serves to receive a coaxial mating connector, which may be arranged, for example, at one end of a coaxial cable (not shown), via which the measuring tip can be electrically connected to a measuring device, not shown.
Der Außenleiter 1 1 des Koaxialleiters steht im direkten Kontakt mit dem Grundkörper 1 , ist mit diesem somit elektrisch verbunden. Der Innenleiter 10, der sich durch die abgestufte Aufnahmeöffnung bis zu der Vertiefung 3 erstreckt, ist in demjenigen Abschnitt, in dem dieser nicht mehr von dem Außenleiter 1 1 umgeben ist, von dem Grundkörper 1 mittels Luft als Dielektrikum isoliert. Im Bereich der Vertiefung 3 kontaktiert der Innenleiter 10 direkt den mittleren der Kontaktbereiche 6 der Leiterplatte 5. Die zwei äußeren Kontaktbereiche 6 kontaktieren dagegen direkt mit dem Grundkörper 1 , wobei in einer alternativen, nicht dargestellten Ausführungsform auch vorgesehen sein kann, die Kontaktierung über Kontaktfederlaschen, die hierzu vorteilhafterweise mit dem Grundkörper 1 verbunden sind, vorzunehmen, um auch bei toleranzbedingten Lageabweichungen von Leiterplatte 5 und Grundkörper 1 eine sichere Kontaktierung zu gewährleisten. Ebenso kann auch die Kontaktierung des Innenleiters 10 mit dem mittleren Kontaktbereich 6 mittels einer oder mehreren Kontaktfederlaschen erfolge, die vorzugsweise an dem Innenleiter 10 befestigt sind. The outer conductor 1 1 of the coaxial conductor is in direct contact with the base body 1, is thus electrically connected thereto. The inner conductor 10, which extends through the stepped receiving opening to the recess 3, is in the portion in which it is no longer surrounded by the outer conductor 1 1, isolated from the base body 1 by means of air as a dielectric. In the region of the depression 3, the inner conductor 10 directly contacts the middle of the contact regions 6 of the printed circuit board 5. The two outer contact regions 6, on the other hand, contact the main body 1 directly. In an alternative embodiment, not shown, contact via contact spring tabs can also be provided. which are advantageously connected to the base body 1, make to ensure a secure contact even with tolerance-related positional deviations of circuit board 5 and body 1. Likewise, the contacting of the inner conductor 10 with the central contact region 6 can take place by means of one or more contact spring tabs, which are preferably fastened to the inner conductor 10.
Der mittlere Messleiter 4, der mittlere Kontaktbereich 6, die diese verbindende Leiterbahn der Leiterplatte 5 sowie der Innenleiter 10 des Koaxialleiters sind als Teil eines Signalpfads bei der Verwendung der Messspitze bei der Prüfung eines elektronischen Bauteils vorgesehen. Die äußeren Messleiter 4, die äußeren Kontaktbereiche 6, die diese verbindenden Leiterbahnen der Leiterplatte 5, der Grundkörper 1 sowie der Außenleiter 1 1 des Koaxialleiters weisen dagegen Massepotential auf. Die in den Zeichnungen dargestellte Messspitze ist somit in einer sogenannte „GSG"-Konfiguration ihrer Messleiter ausgeführt. The middle measuring conductor 4, the middle contact region 6, the connecting conductor of the printed circuit board 5 and the inner conductor 10 of the coaxial conductor are provided as part of a signal path during the use of the measuring tip during the testing of an electronic component. On the other hand, the outer measuring conductors 4, the outer contact regions 6, the connecting tracks of the printed circuit board 5, the base body 1, and the outer conductor 1 1 of the coaxial conductor have ground potential. The measuring tip shown in the drawings is thus designed in a so-called "GSG" configuration of its measuring conductors.
Die Messleiter 4 überragen die Leiterplatte 5 und damit auch den Grundkörper 1 und ragen dadurch frei in den Raum. Dadurch können diese bei ihrem individuellen Kontakt mit definierten Messstellen des zu prüfenden Bauteils individuell elastisch auslenken. Dadurch wird ein sicherer Kontakt aller Messleiter 4 mit den Messstellen auch bei einer leicht verdrehten Lage der Messspitze zu dem elektronischen Bauteil erreicht. The measuring conductors 4 project beyond the printed circuit board 5 and thus also the main body 1 and thus protrude freely into the room. As a result, they can deflect individually elastically in their individual contact with defined measuring points of the component to be tested. As a result, secure contact of all measuring conductors 4 with the measuring points is achieved even with a slightly twisted position of the measuring tip to the electronic component.
Die erfindungsgemäße Ausgestaltung der Messspitze ermöglicht, die Messeinheit einfach und schnell gegen eine identische oder unterschiedliche Messeinheit auszutauschen. Dies kann beispielsweise sinnvoll sein, wenn für ein neues Messvorhaben eine andere Konfiguration der Messleiter 4 erforderlich ist oder eine Messeinheit aufgrund eines Verschleißes der Messleiter 4 ausgetauscht werden muss. Der Grundkörper 1 mitsamt des Koaxialleiters kann dabei weiter verwendet werden. The embodiment of the measuring tip according to the invention makes it possible to quickly and easily replace the measuring unit with an identical or different measuring unit. This can be useful, for example, if for a new measurement project another configuration of the measuring head. 4 is required or a measuring unit has to be replaced due to wear of the measuring head 4. The main body 1 together with the coaxial conductor can continue to be used.
Die Auswechselbarkeit der Messeinheit wird dadurch gewährleistet, dass die Leiterplatten 5 aller vorgesehenen Messeinheiten identisch angeordnete Durchgangsöffnungen 7 und Kontaktbereiche 6 (soweit diese benötigt werden) aufweisen, um die Kombination mit derselben Einheit aus Grundkörper 1 und Koaxialleiter zu gewährleisten. The interchangeability of the measuring unit is ensured by the fact that the printed circuit boards 5 of all provided measuring units identically arranged through holes 7 and 6 contact areas (where they are needed) to ensure the combination with the same unit of base 1 and coaxial.

Claims

Ansprüche: Claims:
Messspitze mit einem Grundkörper (1), mindestens zwei mit dem Grundkörper (1) verbundenen Messleitern (4) und mit mindestens zwei Anschlussleitern, wobei ein erster Anschlussleiter mit einem ersten der Messleiter (4) und ein zweiter Anschlussleiter mit einem zweiten der Messleiter (4) elektrisch leitend verbunden ist, dadurch gekennzeichnet, dass die Messleiter (4) an einem Tragelement befestigt sind und das Tragelement mittels lösbarer Befestigungsmittel auswechselbar an dem Grundkörper (1) befestigt ist. Measuring tip having a base body (1), at least two measuring conductors (4) connected to the base body (1) and having at least two connecting conductors, wherein a first connecting conductor with a first of the measuring conductors (4) and a second connecting conductor with a second of the measuring conductors (4 ) is electrically conductively connected, characterized in that the measuring conductors (4) are fastened to a support element and the support element is removably fastened by means of releasable fastening means to the base body (1).
Messspitze gemäß Anspruch 1 , dadurch gekennzeichnet, dass die Befestigungsmittel eine Verschraubung umfassen. Measuring tip according to claim 1, characterized in that the fastening means comprise a screw connection.
Messspitze gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Messleiter (4) an einer Leiterplatte (5) befestigt sind. Measuring tip according to claim 1 or 2, characterized in that the measuring conductors (4) are fastened to a printed circuit board (5).
Messspitze gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die elektrische Verbindung zwischen den Messleitern (4) und den Anschlussleitern in jedem Verbindungspfad eine Kontaktfederlasche umfasst. Measuring tip according to one of the preceding claims, characterized in that the electrical connection between the measuring conductors (4) and the connection conductors in each connection path comprises a contact spring tab.
Messspitze gemäß Anspruch 3 und 4, dadurch gekennzeichnet, dass mittels der Kontaktfederlaschen die Leiterplatte mit dem Grundkörper (1) und/oder den Anschlussleitern kontaktiert. Measuring tip according to claim 3 and 4, characterized in that contacted by means of the contact spring tabs, the circuit board with the base body (1) and / or the connecting conductors.
Messspitze gemäß Anspruch 5, dadurch gekennzeichnet, dass die Kontaktfederlaschen an dem Grundkörper (1) und/oder den Anschlussleitern befestigt sind und Kontaktbereiche (6) der Leiterplatte (5) kontaktieren. Measuring tip according to claim 5, characterized in that the contact spring tabs on the base body (1) and / or the connection conductors are fixed and contact areas (6) of the circuit board (5) contact.
7. Messspitze gemäß Anspruch 6, dadurch gekennzeichnet, dass Kontaktbereiche (6) zur Kontaktierung des Grundkörpers (1) und/oder der An- Schlussleiter auf einer ersten Seite des Tragelements und die Messleiter auf einer zweiten Seite des Tragelements angeordnet sind. 7. Measuring tip according to claim 6, characterized in that contact regions (6) for contacting the main body (1) and / or the Trailing conductor on a first side of the support element and the measuring conductors are arranged on a second side of the support element.
System zur Ausbildung einer Messspitze gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass mehrere, jeweils die Messleiter (4) und das Tragelement umfassende Messeinheiten vorgesehen sind, wobei alle Messeinheiten mittels der Befestigungsmittel an dem Grundkörper (1) befestigbar sind. System for forming a measuring tip according to one of the preceding claims, characterized in that a plurality, each of the measuring conductors (4) and the support element comprehensive measuring units are provided, all measuring units by means of the fastening means on the base body (1) can be fastened.
EP13818659.8A 2012-12-28 2013-12-12 Measuring tip Withdrawn EP2939032A1 (en)

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CN104981702A (en) 2015-10-14
WO2014101984A1 (en) 2014-07-03

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