Tom Wrighton wrote:
> The terminals are: 1 AC, 2 AC, 3 -s, 4 -V, 5 ND, 6 +V, 7 +s, 8 PO.

S refers to "sense".  These are the voltage feedback inputs for the
regulated outputs.  They are shorted to the outputs at the power supply for
the default case.  That means the supply regulates the output voltage at the
output terminals.  For most hobby applications, that's good enough.

The reason for the separate sense terminals is to overcome a small voltage
drop in a feed wire.  Disconnect the S inputs from their respective outputs
at the power supply, then run a separate wire from the load ends of the feed
cable back to the sense inputs.  This causes the supply to regulate the
voltage at the load, not at the supply.

Usually supplies have limits built in on how much the sense inputs can cause
the outputs to rise above the specified limit.  The sense inputs are usually
connected to the outputs internally via a resistor so that the output
voltage doesn't go crazy if the sense line falls off.  However, I wouldn't
count on any of this.  If using separate sense lines, be very careful and
assume a failure could cause the output voltage to damage something.


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