Hmm, when trying to find the NF510's zero TC I get this curve.. Why this shape??
Measured via 34401A (100PLC) and 10T 5k Bourns WW as the resistor, heating up by "finger" method, powered by an epoxy LT1021-10..
Also I tried to look at a longer run with the Bourns set to "zero TC" (difficult to find the zero, indeed) and I got 13uV/C (2.3ppm/C).
The noise I saw at the level of the dmm noise (450-550nV rms in quiet periods), the lowest I've ever seen here..