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uCurrent Tiny Trace

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steve1515:
I was looking at Dave's uCurrent PCB and noticed the small trace pictured below. It's located in the middle of a much larger trace coming from the negative input. I'm sure there must be a good reason, but I don't know why.  :-//

Can anyone explain the reason why this was done?  :)

TheHolyHorse:
I've never looked at the schematic but it could just be a little trace to link two ground planes together :-//. Without the schematic it could be pretty much anything.

steve1515:
Here's the schematic: http://www.eevblog.com/files/uCurrentRev5schematic.pdf

I don't see any reason for the tiny trace to be there though. It's puzzling.

thm_w:

--- Quote from: steve1515 on September 19, 2019, 06:30:44 pm ---Here's the schematic: http://www.eevblog.com/files/uCurrentRev5schematic.pdf

I don't see any reason for the tiny trace to be there though. It's puzzling.

--- End quote ---

Its a PCB trace fuse. The idea is if you have it on mA range, and put 20A through it, that trace will blow up and the current sense resistor or other parts of the board will not be damaged.

https://electronics.stackexchange.com/questions/200350/can-thin-sections-of-copper-traces-be-used-as-fuses

steve1515:
Ah! That makes perfect sense!

Thanks!  :)

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