| Electronics > Beginners |
| PSU sense lines with obstructions - does it matter? |
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| FriedMule:
I am thinking of making a outlet-bar where my power supplies goes to, so if I need power, I can connect leads to the banana/screw terminals on the outlet-bar without having to fiddle with cables from each power supply and all the way to my project. Now the question: how much will it matter if I also let the S+ and S- go to seperate sense terminal in the outlet-bar and then plug a banana plug in them, when I need the precision of the sense lines? The sense cables has a build in 5½ DMM to measure the compensation. Would that be reliable, do the plugs change much in what the sense cables detect? |
| FriedMule:
Here is a drawing:-) |
| Paul Rose:
If you are still running sense wires all the way to the load from the bar, then the extra connector in the sense path is no trouble. The sense current is tiny, and the voltage drop on the sense line is (sense current)*(sense line resistance). Because of the tiny sense current, a little bit of sense line resistance doesn't matter. This is why sense lines don't have to use heavy wire, even for high current supplies. If you connect the sense to the power at the outlet bar, then you have to worry about voltage drop in the power line between the bar and your load. |
| tggzzz:
You should consider failure modes. What happens if a sense wire is disconnected or has intermittent contact? |
| FriedMule:
I was thinking about, running twisted shielded sense wires from the PSU and direct to two posts that can take spade and banana plugs. From that post, do I want to plug in a wire and direct to the place I want to sense on. So the sense line will go from PSU to post, from post to sense spot. I'll try to get as good a post so that the connection is tight and solid. On the image have I drawen the post from the side, with a banana plug. |
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