Browse Prior Art Database

Selective Dielectric High-Potential Testing

IP.com Disclosure Number: IPCOM000099969D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Lauffer, JM: AUTHOR [+2]

Abstract

Disclosed is a method to test two-sided printed circuit cards and boards (PCBs) for high-potential defects. This technique enables selective testing of non-shorted design nets with low labor intensity and high throughput.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 76% of the total text.

Selective Dielectric High-Potential Testing

       Disclosed is a method to test two-sided printed circuit
cards and boards (PCBs) for high-potential defects.  This technique
enables selective testing of non-shorted design nets with low labor
intensity and high throughput.

      High-potential test methods currently available are typically
parallel plate and line probe testers.  The first technique holds one
plate at ground, while the opposite plate is ramped to test voltage.
The second technique deploys probes that individually test
non-shorted front-to-back nets.

      The former method may be utilized prior to hole drilling and
plating.  An isolation border must be incorporated at the panel edges
to avoid voltage arcing. This test is not applicable to products
shorted by design via plated through holes.  The labor intensive
operations utilized to incorporate an isolation border make this
alternative cost prohibitive.

      The latter method may be performed on products shorted by
design.  The throughput of this technique is gated by the extensive
time needed to individually test each net.  This option is,
therefore, not viable for manufacturing applications.

      The disclosed technique utilizes the parallel plate tester,
i.e.  plates 1, 2.  In addition, a test mask 3 and conductive cloth 4
are employed.  The test mask is created by drilling holes 5 in a
non-conductive sheet of material. The drill pattern, with proper
mask-to- panel ali...