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Doug,
No worries. One of our engineers contacted our old PC layout guy. The mark was for registration of the silk screen and we no longer use it.
Phil Nutting | Senior Development Engineer | Lab: +1-978-224-4334 | Mobile: +1-978-828-8664
35 Congress Street | Salem, MA 01970 | U.S.A. | www.excelitas.com
-----Original Message-----
From: Pauls, Doug O Collins <[log in to unmask]>
Sent: Tuesday, August 10, 2021 3:58 PM
To: Nutting, Phil <[log in to unmask]>
Subject: RE: square spiral etch pattern found on boards
EXTERNAL EMAIL: Use caution with replies, links and attachments.
Sorry Phil, the links don't come through as usable.
Doug Pauls
Fellow, Cleaning and Coating
-----Original Message-----
From: TechNet <[log in to unmask]> On Behalf Of Nutting, Phil
Sent: Tuesday, August 10, 2021 9:24 AM
To: [log in to unmask]
Subject: [External] [TN] square spiral etch pattern found on boards
Esteemed colleagues,
I have been asked about a square spiral pattern of etch on several of our circuit boards. The ends are not connected to anything. I assume it is for verifying copper etch width or etched space width.
Can someone shed some light on these patterns?
Phil Nutting | Senior Development Engineer | Lab: +1-978-224-4334 | Mobile: +1-978-828-. 8664
35 Congress Street | Salem, MA 01970 | U.S.A. | https://urldefense.com/v3/__http://www.excelitas.com__;!!MvWE!UmMn4OlhMpA_FAxZz3GNJgo_Ue4apATAQwvVDy6KJHawulw5RIy-4CR5t08LdbkaMw$ <https://urldefense.com/v3/__http://www.excelitas.com/__;!!MvWE!UmMn4OlhMpA_FAxZz3GNJgo_Ue4apATAQwvVDy6KJHawulw5RIy-4CR5t09CxaeF6g$ >
[cid:[log in to unmask]]
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