I bought a current sensor (link). I would like to connect it to my project, and I was planning to do so by just soldering on copper wires.
There is a resistor on each side, with blobs of tin on each side to keep it in place. These blobs reach out to the place where cables are supposed to be soldered on.
I haven't tried yet, but I imagine, that if I try to solder on the wires this, the tin blob will melt enough that the position and connection of the resistor will change. Thus the resistance will change and the current sensor is no longer useful.
How should I go about this?
In general I wonder about the construction of this board. If the blob on one example reaches just a tenth of a milimeter further towards the other side of the "resistor bridge", then the resistance will be lower.
On the picture from the website (shown below) the blob is smaller, and it would be easier to solder witout changing the connection to the resistors. However it does not look like the resistance is the same from board to board, with this type of "human" soldering. It looks very imprecise.