[SI-LIST] Re: Control Impedance testing
- From: steve weir <weirsi@xxxxxxxxxx>
- To: BO-LIAO <boliao_sg@xxxxxxxxxxxx>
- Date: Sun, 30 Aug 2009 06:26:59 -0700
The test coupons should be from the outside edge(s) of the same panels
that your boards are fabricated from. This is typical practice. You
can incorporate test traces of your own within the board area to verify
impedance control.
Steve.
BO-LIAO wrote:
> Dear Sir,
>
> My PCB supplier doesn't test control impedance on actual board. They said
> control impedance is measured on test coupon.
>
> Please advice if it is realistic and reliable to use the test coupon measured
> impedance?
>
> Is this an industry norm, or standard?
>
> Thank you.
>
> Best regards,
> Liao Bo
>
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