Hello,
My usual attitude toward coupons was always to include the smallest feature
of each kind of via (in case that you have - through, buried, blind, etc).
So, in this case - I would recommend to put only the 0.7mm in the coupon.
If you want more divercity in the coupon than you can include the smallest
via and smallest TH (that is used for component insertion).

My coupons alwasys have pads on all innerlayers, regardless whether they
are signal or plane.

My 2 cents.

Best regards,
Y. Weisz


On Mon, Apr 28, 2014 at 7:50 PM, Ramakrishnan Saravanan <
[log in to unmask]> wrote:

> We are making pcbs for aerospace applications. Our QC informed that the
> test coupon used to evaluate the board shall be representative of PCB. Our
> PCB consist of PTH ranging from 0.7mm to 1.4mm. Also design contains power
> planes.
>
> At present test coupons contain only 0.8mm PTH which lacks representation
> of entire board.
>
> Whether we shall carryout microsection of all types of holes initial and
> stressed one ?.
>
> Shall we include power planes in the test coupon ?.
>
> diagonally opposite coupons are o.k ?.
>
> waiting for your suggestions,
>
> regards,
>
> R.Saravanan
>


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