T.C. measurements on precision resistors

[julian1]

I currently measure on NOMCA1603 networks. I ran into some issue before, as I use a zero force socket. Obviously the socket was not able to reliable break through the oxide on the leads, which resulted in strange t.c. curves. So with a bit of flux and an almost clean solder tip I had to break the oxide, now I get more reasonable results. Here is a first view on a first samle. The t.c. seems to be almost linear.

Edit: Calculated some first values

R1: 4.333ppm/K
R2: 5.452ppm/K
R3: 4.983ppm/K
R4: 4.667ppm/K
R5: 6.072ppm/K
R6: 5.409ppm/K
R7: 5.986ppm/K
R8: 4.823ppm/K

-branadic-

These results are absolute TCR not ratio TCR right?

That's almost 5x better than the datasheet spec of +-25ppm/C absolute TCR.

https://www.vishay.com/docs/60117/nomca.pdf