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Wierd looking Shunt....

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groovesonshunt:
Some time ago, I got myself a Monacor DMT-4010RMS Multimeter. (Danish Company)

After some time, the display would flash at the Volt setting when I came close to touching it. I then opened it up, and found evidence that it had been tampered with. The Shunt had big balls of solder and deep grooves, solder splatter, fingerprint on the inside of the display.
I have only taken apart the main cover into the fuses, so it would not warrent the guarantee.

Have anyone seen grooves on a Shunt like this before?

I got a new one sent back to me, but it started to make the same flashing display error as the first one. Opened it up and found the same grooves on the Shunt. Maybe there is some dirt on the traces, behind the selecter wheel, but I don't want to take it further apart due to the warranty.
The COM test probe also had a smaller size plug, and had a hard time making contact. Worked fine with another set of probes.

srb1954:
Maybe the nicks in the wire and the solder blobs are a crude way of adjusting the shunt resistance to bring it into spec.

groovesonshunt:
These are the probes from the new meter.

Slh:
The solder blobs are weird but the nicks are not.

Current shunts are often adjusted by trimming them mechanically. You find it on all sizes. Smaller resistors might be be laser trimmed but it's the same thing really. Make all of them fractionally under spec and cut them to increase the resistance until it's within spec.

BillyO:
The solder blob is there to fix a nick that was cut to deep.

I prefer filing the shunt.  Much better for getting a precise adjustment but it does take a little longer.

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