Zero Component Orientation Levels A & B

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   IPC-SM-782 released
in 1987 and was active for 18 years, had Level B as the default Zero Component
Orientation . PCB Libraries, Inc. created the first Land Pattern Calculator in
2001 using Level B Zero Component Orientation for both IPC-SM-782 and the new
IPC-7351 standards.
Then in 2005 the
IPC-7351 committee had one meeting at IPC APEX in Anaheim, CA that changed the
Zero Component Orientation to Level A. So PCB Libraries updated LP Wizard to
match the new Level A Zero Component Orientation.

Then in 2007 IEC in
Europe released a new Zero Component Orientation standard IEC 61188-7 with
Level B as the world standard. LP Wizard stayed with Level A Zero Component
Orientation because of IPC-7351. 

The new Library
Expert now defaults to Level B Zero Component Orientation because IPC-7351C
will introduce it to be compatible with both IPC-SM-782 and IEC 61188-7. However,
Library Expert users can change the Zero Component Orientation to whatever
Orientation they want in User Preferences. 

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Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5716	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Topic: Zero Component Orientation Levels A & B Posted: 05 Nov 2014 at 10:15am
	IPC-SM-782 released in 1987 and was active for 18 years, had Level B as the default Zero Component Orientation . PCB Libraries, Inc. created the first Land Pattern Calculator in 2001 using Level B Zero Component Orientation for both IPC-SM-782 and the new IPC-7351 standards. Then in 2005 the IPC-7351 committee had one meeting at IPC APEX in Anaheim, CA that changed the Zero Component Orientation to Level A. So PCB Libraries updated LP Wizard to match the new Level A Zero Component Orientation. Then in 2007 IEC in Europe released a new Zero Component Orientation standard IEC 61188-7 with Level B as the world standard. LP Wizard stayed with Level A Zero Component Orientation because of IPC-7351. The new Library Expert now defaults to Level B Zero Component Orientation because IPC-7351C will introduce it to be compatible with both IPC-SM-782 and IEC 61188-7. However, Library Expert users can change the Zero Component Orientation to whatever Orientation they want in User Preferences.
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