Electronics > Beginners

PSU sense lines with obstructions - does it matter?

<< < (3/3)

FriedMule:

--- Quote from: bsdphk on May 18, 2019, 09:16:49 pm ---You want to use the sense lines all the time in a setup like this, so that the PSU compensates for the wire loss to your connecting-board.

The point about the switch is that you can then choose to sense at the connectors, or wire them all the way down to your experiment.

But do read your PSU's manual carefully, there are a usually footnotes about remote sense lines and stability.

--- End quote ---
Yes that makes sense, my thought was that for usage where the precision did not matter +/-1V, it was not necessary, but I can understand that this is wrong?
What if I make two jumpers from sense to the power? You know like often seen from ground to earth on PSU's.

Rerouter:
If your PSU does not have any kind of built in protection against it, fit some medium size resistors, e.g. 220 ohm in parrellel to the main terminals, this way if a lead lifts it just defaults back to not compensating for the wire drop, when the wires are there, the resistance of the sense leads is so low compared to the resistor that it measures close enough to not matter.

bsdphk:
The reason you want to use sense wires all the time is that it keeps the voltage (more) constant under changing loads.

Using resistors instead of a switch may or may not work, not all PSU's are stable under all conditions.

But as I said: read the manual carefully, there are usually instructions/footnotes about remote sense, because it is not quite as trivial as people think.

For instance you should _always_ use a balanced wire pair for RS, either twisted (rj45 is fine) or twinax.

Also check the manual for recommended capacitance at the remote output terminals.


Navigation

[0] Message Index

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod