Testing Power Supplies! Re: Norsk Data Nord-10/S restoration effort on the way!

[Paul Koning]

>>>>> "Tore" == Tore S Bekkedal <Tore> writes:

 >> If the supply has a "crowbar overvoltage protection" circuit in
 >> it, that's a different matter.
 Tore> This PSU is rugged and has "Voltage OK" lights on all the
 Tore> voltage lines.  It is according to a man who is knowing,
 Tore> incredibly sturdy and used with defense systems all over the
 Tore> country.

"Incredibly sturdy" is nice.  But that doesn't translate into "cannot
ever fail".

"Voltage ok" may mean there's a crowbar, or it may only mean there is
a voltage monitor.  Those are very different things.  Voltage monitors
wouldn't protect you against a regulator short.

 Tore> But access to a complete array of spares if nessecary. Oh, and
 Tore> the CPU is built in TTL logic, so no hard-to-get spares.

TTL is getting hard to find, especially the more obscure types such as
74S series.  (And if the book says they want 74S, it's quite possible
no other variant will work...)

   paul