On 10/29/06, M. Adam Davis <stienman@gmail.com> wrote:
> The cheap and easy method I've used was to create three additional
> circuit boards for the tester pins.  The bottom board had flat pads,
> the middle board was spaced slightly above the bottom board and had
> holes just larger than the pogo pins, and the top board was identical
> to the middle board, but spaced a little above the middle board.  Drop
> the pogo pins in the holes and they make contact with the pads on the
> bottom PCB.  One could replace the middle and top boards with delrin
> or some other insulating thick material as well.
>
> The boards had screws with nuts to space them, and at certain
> locations the screws would go past the top board to guide the unit
> under test onto the top board.  I usually used nuts to hold the unit
> under test onto the tester, but one could also develop a hinged
> overboard that holds the unit under test correctly.
>
> The bottom board pads would terminate to appropiate connectors (in
> this case JTAG, power, and an RS-232 connector)
>
> I don't have the tester at hand, so I cannot provide pictures,
> hopefully the description is adequate.

Adam, I would love to see a picture. How looks the pogo pins ?
(ok I'll search on google)

The bed of nails has a standardized positions for nails ? That means
the PCB designer should position the test points on the PCB according
on his bed of nails doccumentation, or the bed of nails could be
reconfigurable for a particular grid dimension used on PCB ?

thx,
Vasile
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