Circuit board test fixture
ICT does not take a very long time to perform, for example if flying probe takes 20 minutes or so, ICT for the same time might take a minute or so.ICT testing does power up testing and eliminates customer debug needs to almost ZERO.Although a costly fixture is required, ICT covers 100% testing so that all power and ground shorts are detected.ICT provides OEM customer such benefits as: The bed of nails or in-circuit tester such as 3070 from Agilent is the most common and popular in the contract manufacturing environment.
![circuit board test fixture circuit board test fixture](https://www.multex.co.uk/wp-content/uploads/2019/09/Toggle-Clamp-Jig-1.png)
On the other hand, vacuum fixtures are expensive because of their high manufacturing complexity. Vacuum fixtures give better signal reading versus the press-down type. A fixture can either be vacuum or press-down. It takes a few weeks to create the ICT fixture and do its programming. Devices that have been tested on a bed of nails tester may show a small mark or a dimple which comes from the sharp tips of pogo pins used in the fixture. These devices contain an array of small, spring-loaded pogo pins making contact with one node in the circuitry of the device under test (DUT).īy pressing the DUT down against the bed of nails, a reliable contact can be made quickly with hundreds and in some cases thousands of individual test points within the DUT’s circuitry.
![circuit board test fixture circuit board test fixture](http://wstianmao.com/uploadfiles/pictures/product/20160415114016_6842.jpg)
It has numerous pins inserted into holes, which are aligned using tooling pins to make contact with test points on a printed circuit board and are also connected to a measuring unit by wires. With sufficient access points, ICT can transmit test signals into and out of PCBs at high speed to perform evaluation of components and circuits.Ī bed of nails tester is a traditional electronic test fixture.
![circuit board test fixture circuit board test fixture](https://content.instructables.com/ORIG/F92/O6GK/JUWXXAFC/F92O6GKJUWXXAFC.jpg)
It uses a bed-of-nails test fixture to access multiple test points on the PCB’s bottom side. In circuit testing (ICT) is traditionally used on mature products, especially in subcontract manufacturing.