Altium 500 Clearance errors, NONE correct - Page 1
Forum section: electronics / projects

author: ricko_uk
author_rank: Super Contributor
timestamp: December 04, 2024, 12:14:05 am
content: Hi,could someone please help with this, in 20 years of using Altium it never happened before and could not find any solution. It is very urgent because needed to send off to manufacture yesterday under massive pressure from the customer because it costs thousands of pounds every day of production being halted.I am using Altium 21 and I have been routing the PCB all along withonly one single clearance rulewhich is set to "all to all" and to a value of 0.15mm for all items and it works while routing (and I can also see the routing boundaries while routing) and they have been always respected automatically (while interactive routing it would not get closer than the allowed boundary gap of 0.15mm). So I routed the entire PCB.Screenshot of the Clearance rule setup is also attached.When I ran clearance error check at the end, as you can see from the attached screenshot, it brings up 500 clearance errors (it stops at 500 because that is the limit set but it might highlight many more, perhaps the whole PCB) but none of those are less than 0.15mm (and by far !!).I reused a previous Altium PCB file (from a completed project) and the original one does not have any such errors (and never did).Any idea how to fix it?Thank you as always!! 🙏

author: Benta
author_rank: Super Contributor
timestamp: December 04, 2024, 12:21:25 am
content: Here you go:https://www.altium.com/support

author: ricko_uk
author_rank: Super Contributor
timestamp: December 04, 2024, 12:26:33 am
content: Thank you Benta,unfortunately don't have an active subscription.Thank you

author: Electro707
author_rank: Contributor
timestamp: December 04, 2024, 01:19:40 am
content: try changing "Any Net" to "Different Nets Only" in your clearance rulehttps://www.altium.com/documentation/altium-designer/pcb-electrical-rule-clearance?version=18.1#constraintsIt is also odd that the collision rule is stating "<0.11mm" while your clearance is set at 0.15mm. A small observation.

author: ricko_uk
author_rank: Super Contributor
timestamp: December 04, 2024, 02:17:07 am
content: Thank you Electro707,Changing that to "Different Nets" removed a lot of them, but still 137.Yes, unclear why it shows that when the rule is set to 0.15Thank you

author: moffy
author_rank: Super Contributor
timestamp: December 04, 2024, 02:55:45 am
content: The fact that it is mentioning 'ARC' is it between an overlay and a track? If so it's not really a problem.

author: ricko_uk
author_rank: Super Contributor
timestamp: December 04, 2024, 04:15:20 am
content: Thank you Moffy,they are tracks from "rounded" length tuning.Thank you

author: moffy
author_rank: Super Contributor
timestamp: December 04, 2024, 05:22:15 am
content: I assume that the highlighted green parts are the errors, that's how they show up in my version of Altium. When I get continuous tracks that are part green I check that the sections are the same 'net' identifier, sometimes you get a 'no net' section connected to a named net and the ERC throws an errror.

author: temperance
author_rank: Super Contributor
timestamp: December 04, 2024, 05:56:38 am
content: After chasing a problem which looks similar to yours some years ago it turned to be a problem with the layer stack up:https://www.altium.com/documentation/knowledge-base/altium-designer/clearance-constraint-between-polyregion-on-multilayer-and-pad?srsltid=AfmBOopD-aTMUagpSVO8x4ZQCrr75M0ghTLpXjtXBrhbtOH7PUvvwFI1