Service > Questions and Anwers

Questions and Answers

Knowing everything is not essential, but asking for answers is allowed. Here you find a selection of frequently asked product- or application-related questions and the right answers. This list is continuously growing, your own questions are welcome!

Contact Probes

How are contact probes designed?

 

Contact probes consist of a barrel, a spring and a movable plunger. Depending on the application and the customer needs different materials and coatings are used.

> Design of spring contact probes

Which types of contact probes exist?

 

There is a great variety of different contact probes for different applications, some of them with integrated special functions. The portfolio includes ICT/FCT Probes, Switch Probes, Threaded Probes, High Current Probes as well as Coaxial Probes for Kelvin measurements or RF applications.  

> Types of Contact Probes

Which tip styles are available?

 

There are many different tip styles available for contact probes, depending on the required application. Here you find a complete overview about all FEINMETALL tip styles as well as their typical applications.

> Tip Styles 

Is there a solution for contacting lead free soldered boards?

 

Leadfree soldered pads very often are contaminated with viscous flux residues or oxides, that are difficult to penetrate. Conventional contact probes very often do not provide a reliable contact and additionally they are contaminated very quickly, what leads to a reduced life-time. FEINMETALL has developed a special series of contact probes for this difficult application.

> Progressive Series

What's the best way to realize presence tests?

 

To realize presence tests of components or connectors, usually switch probes are used. These probe have an integrated switch that opens or closes a switch circuit as soon as a special travel is reached. Additionally special insulation caps enable testing the correct alignment or length of pins.

> Presence Tests with Contact Probes

What probes are available with insulation caps?

 

Probes with insulation caps allow to test the sufficient length or the correct alignment of contact pins additionally to the electrical contacting. Too short pins lead to a stop of the probe and therefore the electrical contact is not made. Only a contact pin with sufficient length leads to an electrical contact.

> Insulating Caps - Overview

How are high current probes designed?

 

Contact probes for high current applications are designed in a different way than conventional contact probes. For high current applications it has to be made sure that only a very low current is taken by the integrated spring, also the springs need to be suitable for high temperatures.

> High Current Probes

What are the typical applications in wire harness tests?

 

FEINMETALL is the market leader in providing a great variety of special contact probes for the test of wire harnesses in the automotive industry. Innovative and applicable solutions are setting standards here. Here you find a good overview of test needs in modules - and their contacting solution.

> Wire Harness Test

What probes are suitable for 4-pole resistance measurement?

 

The 4-pole resistance measurement principle (so called Kelvin measurement) allows measuring very low resistances precisely. A fix current is fed into the tested item and simultaneously the resulting voltage is measured. For an exact test result it is ideal to use coaxially designed contact probes, feeding the current by the outer conductor and measuring the voltage with the inner conductor.

> Kelvin Measurement Principle

How are Radio Frequency Probes designed?

 

Spring contact probes for RF applications are coaxial probes with RF compatible designed inner and outer conductor. RF signals need to be transmitted in a maximum frequency range with a minimum loss. Here you find more details about the terms and definitions as well as an overview of all available FEINMETALL RF probes.

> Radio Frequency Probes

What are the different types of receptacles and how are they mounted?

 

The most contact probes are mounted in receptacles, because this makes it easy to exchange probes allows soldering without damaging the spring in the probe. The probe is just plugged or screwed into the receptacle after the electrical connection is made. For different types of electrical connections different receptacles are available.   

> Receptacles and Mounting

Are there special tools for mounting probes and receptacles?

 

For mounting and exchanging contact probes and receptacles FEINMETALL offers various helpful tools. For inserting standard probes practical insertion or screw-in tools are necessary, for mounting and adjusting switch probes additional functions are ideal that help to determine the correct position of switch points. Here you find the complete portfolio of our tools.

> Tools

How interfacepins are used?

 

Rigid Pins in Interfaces are called Interface-Pins.
Most of them are produced with Brass and have plating of gold, nickel or rhodium. They exist with different tip styles and connections to suit all the different requirements and applications.

Below is a small overview:

> INTERFACE PINS