DE2938962A1 - Low value resistance fine limit adjustment method - monitors resistance while directing fine sand-blast against surface of resistance coil - Google Patents

Low value resistance fine limit adjustment method - monitors resistance while directing fine sand-blast against surface of resistance coil

Info

Publication number
DE2938962A1
DE2938962A1 DE19792938962 DE2938962A DE2938962A1 DE 2938962 A1 DE2938962 A1 DE 2938962A1 DE 19792938962 DE19792938962 DE 19792938962 DE 2938962 A DE2938962 A DE 2938962A DE 2938962 A1 DE2938962 A1 DE 2938962A1
Authority
DE
Germany
Prior art keywords
resistance
value
fine
low value
monitors
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
DE19792938962
Other languages
German (de)
Inventor
Dipl.-Phys. Otto Nögel
Alois 8300 Landshut Sacher
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.)
Resista Fabrik Elektrischer Widerstande GmbH
Original Assignee
Resista Fabrik Elektrischer Widerstande 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 Resista Fabrik Elektrischer Widerstande GmbH filed Critical Resista Fabrik Elektrischer Widerstande GmbH
Priority to DE19792938962 priority Critical patent/DE2938962A1/en
Publication of DE2938962A1 publication Critical patent/DE2938962A1/en
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
    • H01C17/22—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming
    • H01C17/24—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming by removing or adding resistive material
    • H01C17/245—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming by removing or adding resistive material by mechanical means, e.g. sand blasting, cutting, ultrasonic treatment

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)

Abstract

The method of adjusting the value of low value resistors formed by coiling low resistance wire, uses sand blasting to obtain a required resistance value. The system can be used for very fine adjustment of resistances between 0.1 and 1000 ohms, pref. between 1 and 100 ohms. The value of the resistance can be measured during adjustment. The wire is wound into the required shape of coil and a blast of fine sand is directed onto its surface.

Description

Verfahren zum Abgleichen des WiderstandswertesProcedure for adjusting the resistance value

von elektrischen Widerständen Beschreibung Die vorliegende Erfindung betrifft ein Verfahren zum Abgleichen des Widerstandswertes von elektrischen Widerständen, insbesondere von Drahtwiderständen. of electrical resistances Description The present The invention relates to a method for adjusting the resistance value of electrical Resistors, especially wirewound resistors.

Eine direkte Herstellung von niederohmigen Drahtwiderständen mit engen Toleranzen des Widerstandswertes ist bisher direkt nicht möglich. Solche Widerstände müssen in jedem Fall justiert bzw. abgeglichen werden. Dies ist um so schwieriger, je enger die Toleranzen sind.A direct manufacture of low resistance wirewound resistors with tight Tolerance of the resistance value is not yet possible directly. Such resistance must be adjusted or matched in any case. This is all the more difficult the closer the tolerances are.

Da beim Abgleich des Widerstandswertes auch gleichzeitig mit sehr großer Genauigkeit gemessen werden muß, scheiden alle Verfahren zum Abgleich des Widerstandswertes aus, die eine Erwärmung des abzugleichenden Widerstandes hervorrufen. Somit ist beispielsweise ein Abgleich des Widerstandswertes mittels Laserstrahl nicht möglich.Since when comparing the resistance value also at the same time with very must be measured with great accuracy, all methods for calibrating the Resistance values that cause the resistance to be adjusted to heat up. Thus, for example, the resistance value can be adjusted by means of a laser beam not possible.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren anzugeben, mit dem insbesondere niederohmige elektrische Drahtwiderstände genau abgleichbar sind.The present invention is therefore based on the object of a method specify with which, in particular, low-ohm electrical wire resistors exactly are adjustable.

Diese Aufgabe wird bei einem Verfahren der eingangs genannten Art erfindungsgemäß dadurch gelöst, daß das Widerstandselement mittels eines Sandstrahls bis zum Erreichen eines vorgegebenen Sollwertes des Widerstandes abgetragen wird.This task is performed in a method of the type mentioned at the beginning solved according to the invention in that the resistance element by means of a sandblast is removed until a specified target value of the resistance is reached.

Ausgestaltungen des Erfindungsgedankens sind in Unteransprüchen gekennzeichnet.Refinements of the inventive concept are characterized in the subclaims.

Die Erfindung wird im folgenden anhand von Ausführungsbeispielen noch näher erläutert.The invention is illustrated below with the aid of exemplary embodiments explained in more detail.

Mit dem erfindungsgemäßen Verfahren werden Widerstandselemente von elektrischen Widerständen, insbesondere Widerstandsdrähte von niederohmigen Drahtwiderständen durch Sandstrahlen abgetragen, wodurch sich der Widerstandswert von einem anfänglich niedrigeren Wert erhöht und ein gezielter Sollwert sehr genau erreicht wird.With the method according to the invention, resistance elements of electrical resistances, in particular resistance wires of low resistance Wirewound resistors are removed by sandblasting, which increases the resistance value increased from an initially lower value and a targeted setpoint very accurate is achieved.

Dieses Verfahren eignet sich insbesondere für niederohmige Drahtwiaerstände von z.B. 0,1 bis 1000 Ohm und vorzugsweise 1 bis 100 Ohm.This method is particularly suitable for low-resistance wire resistances for example from 0.1 to 1000 ohms and preferably from 1 to 100 ohms.

Der Abgleich bzw. die Justierung des Widerstandswertes in engen Toleranzen erfolgt vorzugsweise bei gleichzeitiger Messung des Widerstandswertes während der Behandlung mittels eines feinen Sandstrahls.The adjustment or adjustment of the resistance value within tight tolerances preferably takes place with simultaneous measurement of the resistance value during the Treatment with a fine sandblast.

In der Praxis werden Widerstandsdrähte mit einem im Vergleich zum Sollwert des Widerstandes kleineren Widerstandswert auf Widerstandskörper gewickelt. Der Sollwert des Widerstandes wird dann durch flächiges Abtragen des Widerstandsdrahts mittels Sandstrahl in einem Grob- und Feinabgleichvorgang eingestellt.In practice, resistance wires are compared with a Nominal value of the resistor, the smaller the resistor value is wound on the resistor body. The desired value of the resistance is then obtained by removing the resistance wire over the entire surface adjusted by means of sandblasting in a coarse and fine adjustment process.

Claims (3)

Patentansprüche ÄÄ ½)Verfahren zum Abgleichen des Widerstandswertes von elektrischen Widerständen, insbesondere von Drahtwiderständen, dadurch gekennzeichnet, daß das Widerstandselement mittels eines Sandstrahls bis zum Erreichen eines vorgegebenen Sollwertes des Widerstandes abgetragen wird. Claims ÄÄ ½) Method for adjusting the resistance value of electrical resistances, in particular of wire resistors, characterized in, that the resistance element by means of a sandblast until reaching a predetermined Target value of the resistance is plotted. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Widerstandswert während der Behandlung mittels Sandstrahl gemessen wird. 2. The method according to claim 1, characterized in that the resistance value is measured by sandblasting during treatment. 3. Verfahren nach Anspruch 1 und/oder 2, dadurch gekennzeichnet, daß ein Widerstandsdraht mit einem im Vergleich zum Sollwert des Widerstandes kleineren Widerstandswert auf einen Widerstandskörper gewickelt wird und daß der Sollwert des Widerstandes durch flächiges Abtragen des Widerstandsdrahts mittels Sandstrahl eingestellt wird. 3. The method according to claim 1 and / or 2, characterized in that that a resistance wire with a smaller compared to the nominal value of the resistance Resistance value is wound on a resistor body and that the setpoint the resistance by removing the resistance wire from the surface using a sandblast is set.
DE19792938962 1979-09-26 1979-09-26 Low value resistance fine limit adjustment method - monitors resistance while directing fine sand-blast against surface of resistance coil Ceased DE2938962A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19792938962 DE2938962A1 (en) 1979-09-26 1979-09-26 Low value resistance fine limit adjustment method - monitors resistance while directing fine sand-blast against surface of resistance coil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792938962 DE2938962A1 (en) 1979-09-26 1979-09-26 Low value resistance fine limit adjustment method - monitors resistance while directing fine sand-blast against surface of resistance coil

Publications (1)

Publication Number Publication Date
DE2938962A1 true DE2938962A1 (en) 1981-04-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19792938962 Ceased DE2938962A1 (en) 1979-09-26 1979-09-26 Low value resistance fine limit adjustment method - monitors resistance while directing fine sand-blast against surface of resistance coil

Country Status (1)

Country Link
DE (1) DE2938962A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5555246A (en) * 1993-02-16 1996-09-10 Landis & Gyr Business Support Ag Process for the production of a balanced wire resistor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1763888A1 (en) * 1967-08-21 1972-01-27 Pennsalt Chemicals Corp Abrasion method, in particular for adjusting electrical elements, as well as device for carrying out the method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1763888A1 (en) * 1967-08-21 1972-01-27 Pennsalt Chemicals Corp Abrasion method, in particular for adjusting electrical elements, as well as device for carrying out the method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DE-Z: Intern. Elektronische Rundschau, 1971, Nr. 8, S. 196-199 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5555246A (en) * 1993-02-16 1996-09-10 Landis & Gyr Business Support Ag Process for the production of a balanced wire resistor

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