Connector Pin Counting Sequence Alternating count, or sometimes called Staggered count. This is a very typical counting pattern for dual row headers of all kinds. The different families of Cirris adapters…

Connector Contact Retention   A key problem with wire harness assemblies constructed with crimp and poke style terminations is contact retention failures or terminal “push back.” Of primary concern are those…

Temperature Coefficient of Resistance for Copper   The Temperature Coefficient of Resistance for Copper (near room temperature) is  0.393% per degree Celsius (C) meaning that for every 1°C rise in temperature,…

Dry Circuit Testing Have you ever been asked to perform a Dry Circuit Test? You might respond that dry circuit testing is not a part of the IPC/WHMA-620 test requirements.…

Can I Test For Broken Strands? Over the years, numerous Cirris customers have asked us if there was a way to detect broken strands in their cables by using standard…

How Much Wire is on the Spool? Choose one of several ways to determine the amount of wire remaining on a spool. Counting Scale: Measure a sample length of wire,…

Pullout Force per Wire Size Below is a summary of the common minimum pull strengths per wire size. This summary is for reference only. Be sure to consult the actual…

Twisted Pair Testing Twisted pairs introduce complexity that can make assemblies more difficult to build and test. However, there are some helpful guidelines that can lead to better overall results.  …

Testing Assemblies with Diodes Erik Streb [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0)] Test programs sometimes include instructions to assess components connected to your device-under-test. These component instructions evaluate wires, resistors, capacitors, twisted…