Howard, I've never thought one was enough.
Usually, there are people testing on several fronts:
EMC, UL/CSE, active hardware circuitry, finally firmware.

One is enough ONLY if you are a one-man band and you
can order the tests.

--Bob

Howard Winter wrote:

>Bob,
>
>On Sun, 02 Oct 2005 18:06:19 -0700, Bob Axtell wrote:
>  
>
>>...<
>>Purchasing 1000 PCBs that are not right is very costly. The chance
>>of you getting the layout correct the first time is impossible; most
>>commercial designs have 7-8 versions before committing to a
>>volume purchase.
>>    
>>
>
>I can well believe this - and in that case, why do a lot of the board houses have the so-called Prototype 
>minimum of 5 pieces?  I know Olimex will do one-offs, but most of the others won't, which seems a huge waste 
>of money.  If you discover problems only "using" one board at each iteration, you have 7 * 4 = 28 wasted 
>boards!
>
>Cheers,
>
>
>Howard Winter
>St.Albans, England
>
>
>  
>


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