Temperature Drift Measurement of LTC6655


The LTC6655 datasheet shows smooth temperature drift curves. I ordered the EVM DC2095A-B and measured the drift by doing a temperature ramp and keeping sampling the reference output. There is some random noise shown up and it may result from my measurement instrumentation.

I am just wondering how is the measurement carried out for the curves shown in datasheets? Is it also doing a temperature ramp, keep sampling and then filter the high freq noise in math?