🚀 go-pugleaf

In article <3852@kitty.UUCP> larry@kitty.UUCP (Larry Lippman) writes:
+---------------
| 	Some well-designed power supplies provide an external sense lead
| which is connected to a terminal on the PC-board backplane.  This will
| automatically compensate for any IR drop between the supply and the
| backplane.  If your power supply has a multi-pin connector whose pin
| functions are not explicitly labeled or otherwise known, it may be that
| one or more pins are for sense purposes.
| 
| 	Failing to connect a voltage sense lead to the power output lead
| will result in an incorrect voltage with lack of regulation (usually, but
| not always a *lower* voltage).
+---------------

And even *more*-well-designed supplies contain internal resistors between
the sense leads and the outputs to keep the output from wandering far afield
if the sense leads get disconnected. The internal resistor is usually a lot
larger than the resistance of the sense wire but small enough to give good
regulation if the sense wire is broken/missing. (A typical value is ~20 ohm.)


-Rob

-----
Rob Warnock, MS-9U/510		rpw3@sgi.com		rpw3@pei.com
Silicon Graphics, Inc.		(415)335-1673		Protocol Engines, Inc.
2011 N. Shoreline Blvd.
Mountain View, CA  94039-7311