Head forms

Die hier dargestellten typischen Anwendungsbeispiele sollen Ihnen bei der Auswahl des richtigen Typs helfen. Die Zahlencodes bei den Tastkopfbeschreibungen sind dieselben, die in den Bestellnummern verwendet werden und die Sie auf den folgenden Produktseiten vorfinden. Federkontaktstifte werden überwiegend für den Test unbestückter oder bestückter Leiterplatten und Baugruppen in der Elektronik eingesetzt (Bare-Board-Test, MDA-Test, In-Circuit-Test, Funktionstest). Dabei spielen für die Auswahl der richtigen Tastkopfform verschiedene Faktoren eine wichtige Rolle. Besonders durch die Verwendung bleifreier Lötprodukte sind die Anforderungen an die Kontaktierelemente beim Test von bestückten Baugruppen enorm hoch. Die auf dem Prüfling vorhandenen Flussmittelreste oder andere Kontaminationen erschweren eine zuverlässige Kontaktierung mit den herkömmlichen Methoden. Spezielle Tastkopfformen oder auf diese Anwendung hin abgestimmte Kontaktstifte leisten hier gute Dienste.

No. Head form Main application
101 Flex-Needle
(Steel)
Flex-Needle Long, cut, irregular shaped component pins. Highly resistant against radial force. Aggressive and flexible, penetrates insulating coatings.
102 Sharp Tip
(Steel)
Sharp Tip Similar range of application compared with the flex needle, but not flexible and with better electrical characteristics.
03 Flat Flat For sensitive contact surfaces (gold plated pads), edge connectors, and clean surfaces which must not be damaged (indented). Easy to clean.
203 Plastic Flat Head
(non-conductive)
Plastic Flat Head Mainly used for switch probes and seating pins which have only mechanical modes of operation and should be non-conductive.
04 Concave Head
(Cup)
Concave Head Connector pins, wire-wrap posts, long component terminals. Self-centering.
05 Spherical Round Spherical Round Gold plated pads, edge connectors. Leaves no marks or indentations.
06 4-point Crown 4-point Crown Convex solder pads, short component leads, solder points, general purpose areas. Universal use.
07 Crown with Centre Tip
(Centre Tip is protruding)
Crown with Centre Tip Component leads, wire-wrap posts, solder points of any shape. Universal use.
08 Serrated Tip
(typically composed of nine pyramids)
Serrated Tip Component leads, terminal strips, screw heads, general purpose areas.
308 Serrated
(with protruding plastic sleeve)
Serrated Detecting the presence of component leads. Missing pins or too short pins are not contacted.
09 6-sided Chisel 90° 6-sided Chisel 90° Open vias (plated through holes), breaks through contaminations. Certain terminal strips.
10 3-sided Chisel 30°
(Tip shows up with 30° when rotated)
3-sided Chisel 30° Open vias on bare boards and loaded boards. Interface contacts.
12 6-sided Dagger 6-sided Dagger Heavily flux-contaminated pads (long time after soldering), soldered or open vias.
13 8-point Crown
(self cleaning)
8-point Crown Good self-centering, for heavily contaminated component leads (after wave soldering) and pads of suitable size.
14 Rounded Sharp Tip 60° Rounded Sharp Tip 60° Similar to Sharp Tip, but with less penetration and indentation marks. Concentrates the contact force on a point.
15 Conical Tip 90° Conical Tip 90° Open, clean vias, doesn’t leave marks or indentations. Partly suitable for female connector contacts.
118 Dagger
(also called Spear, 4-sided)
Dagger Heavily flux-contaminated pads (long time after soldering), soldered or open vias. This is the most common head-style in ICT fixtures.
20 3-sided ­Chisel
(Tip shows up with 90° when rotated)
3-sided ­Chisel Open vias, applications similar to style 15, but with three edges. Good contact quality in interfaces with hollow counter-parts. Self-centering.
22 4-sided Chisel 4-sided Chisel Open vias, applications similar to style 20, however with four edges.
24 Spade
(also called passive dagger)
Spade Open vias (plated through holes), breaks through contaminations. Less aggressive than style 118.
26 Spade
(also called passive dagger)
Spade Open vias (plated through holes), breaks through contaminations. Certain terminal strips. Similar to type 24, but more obtuse angle.
27 Crown with Centre Tip
(Centre Tip has same length)
Crown with Centre Tip Component leads, wire-wrap posts, solder points of any shape. Universal use. Similar to type 07, centre-tip has same length as crown tips around.
30 3-sided Chisel
(Tip shows up with 106° when rotated)
3-sided Chisel Large open vias in Bare Board Test. Only available in series 29.
35 Lentil Head Lentil Head Surface protecting contact on pads and foil. Very common on Battery Probes and slip ring contacts.
46 Self cleaning 4-point Crown Self cleaning 4-point Crown Convex solder pads, short component leads, solder points, general purpose areas. Universal use. Similar to type 06, but self cleaning.
49 6-sided Chisel with Collar 6-sided Chisel with Collar Open vias (plated through holes), breaks through contaminations. Certain terminal strips
61 Cross-slotted Concave Head
(self cleaning)
Cross-slotted Concave Head Connector pins, wire-wrap posts, long component terminals. Self-centering. Similar to type 04, but more aggressive because of additional inner edges and self-cleaning by removal ducts.
162 5-point Crown
(Steel)
5-point Crown Universal shape. Due to odd-numbered points at least one point makes contact, even with bar-shaped contacts.