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update test coupons for staggered vias

Zhicai Zhang requested to merge zhicaiz/powerboard_v3:zz_coupon_2023 into master

Three via chains added (replacing old via chains):

  • F-In1: 567 vias
  • In1-In2: 567 vias
  • In2-B: 578 vias

Via size: 14/6 mils; via distance: 15 mil

F-In1 and In2-B via chains are put in series, connected to 3 pads of the pin header connector (one in the middle of the two via chains, the other two at the two ends of the two via chains).

In1-In2 via chain is connected to another two pads.

Total trace length is now also longer (from 1268 mm to 1856 mm) because of extra space saved by new via chains.

Files are saved in KiCad 7 format (my bad.. only realized this after work was done). One can only check with Gerber views if using an older KiCad version.

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