Contents
What is an ICC Test electronics?
A continuity test is performed by placing a small voltage (wired in series with an LED or noise-producing component such as a piezoelectric speaker) across the chosen path. If electron flow is inhibited by broken conductors, damaged components, or excessive resistance, the circuit is “open”.
Does lying on a bed of nails hurt?
It appears to the spectator that anyone lying on this “bed” would be injured by the nails, but this is not so. Assuming the nails are numerous enough, the weight is distributed among them so that the pressure exerted by each nail is not enough to puncture the person’s skin.
Why does lying on a bed of nails not hurt?
The force produced by the man’s weight is distributed over hundreds of nails of the nail bed. Therefore, the force applied by individual nail is reduced. The nails do not penetrate in the man’s skin and he does not get hurt. Thus, a person can lie on a bed of nails if there are very large number of nails.
What does a bed of Nails test bed look like?
The test bed looks like a bed of nails as well, hence the name. There are other ways of testing PCBs after production, too, but if your board doesn’t involve any type of processing they might be hard to implement. Nixie tubes are mostly in the “analog” realm so this test setup works well for [Thom]’s needs.
How are PCBs laid on a bed of nails?
This project comes to us by way of [Thom] who has been doing a large production run of circuits meant to drive nixie tubes. After the each board is completed, they are laid on top of a number of pins arranged to mate to various points on the PCB.
What should the pins be on a bed of nails?
These pins on the bed of nails should be conical at the tips and longer than the pogo-pins so the board lines up BEFORE it makes contact with the test pins. I believe pictures are worth a thousand words (?).
How are electrical connections made in a bed of nails?
Electrical connections were done with discrete wires point-to-point. These design choices for the bed of nails allowed several useful properties. The holes for the pogo pin sockets had a high aspect ratio, so the pogo pins aligned themselves well in the vertical.