question about sensing resistors - Page 2 - Electronic Circuits Projects Diagrams Free

Hayato · 11th April 2009, 04:59 AM

Quote:

Originally Posted by 3v0

I am trying to understand this.

So if one took a standard resistor and ran two wires from the sense circuit directly to the resistor you have in effect a 4 terminal resistor ?

Well, the 4 terminal resistor could be 2 resistor packed in 1, so that they are connected in parallel, to improve the thermal dissipation by dividing the current.

Sceadwian · 11th April 2009, 05:23 AM

Four-terminal sensing - Wikipedia, the free encyclopedia
Also called Kelvin sensing, that's pretty much it, the extra set of wires are just there to correct for line losses using an unloaded set of wires.

3v0 · 11th April 2009, 02:55 PM

According to this graphic from the wikipedia article there is only one resistor. As far as I understand the principal you need to hook the sense traces/wires directly to the sense resistor, not some common gnd etc.

Sceadwian · 11th April 2009, 10:34 PM

I'm not sure what Hayato is talking about, I'm sure it could be done but I've never seen two resistors packed in the same package like that before. If it's a sense resistor and has four terminals they're for kelvin sensing.

adam.tucker55 · 13th June 2009, 04:07 AM

A current sense can also be built right onto your pcb. google pcb trace length resistance

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11th April 2009, 05:23 AM	#17
Sceadwian	Four-terminal sensing - Wikipedia, the free encyclopedia Also called Kelvin sensing, that's pretty much it, the extra set of wires are just there to correct for line losses using an unloaded set of wires. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

11th April 2009, 02:55 PM	#18
3v0	According to this graphic from the wikipedia article there is only one resistor. As far as I understand the principal you need to hook the sense traces/wires directly to the sense resistor, not some common gnd etc. Attached Thumbnails __________________ Please post questions to the forums. PM's are for personal communication. BCHS/3v0's Tutorials Junebug USB PIC programmer kit., USB Bit Whacker, The 15 Minute Printed Circuit Board! (+drill time)

11th April 2009, 10:34 PM	#19
Sceadwian	I'm not sure what Hayato is talking about, I'm sure it could be done but I've never seen two resistors packed in the same package like that before. If it's a sense resistor and has four terminals they're for kelvin sensing. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

13th June 2009, 04:07 AM	#20
adam.tucker55	A current sense can also be built right onto your pcb. google pcb trace length resistance