CalMachine KX2 Temperature box test, GPIB code running on Raspberry Pi 3 + NI GPIB-USB-HS FC

TC Result = -0.058 ppm/K peak, zero TC around +40 °C

Trim resistor = 563K, B03 modification applied
PID settings: KP=140, KI=0.2, KD=1.2, Max TEC voltage = 10.5V, Max TEC Current = 1A, YSI 44006 current = 100E-6 A

Reference levels:
LTZ CM1 KX2 REF = 7.157422 VDC;

Result CSV-data

Workflow:

* RPI accesses DMMs via GPIB and reads data.
* Data is formatted by python script into DSV string and written/append to file on FTP
* DSV-file is visible publicly on https://xdevs.com/datashort/
* Page http://xdevs.com/datalog_mm/ runs D3.js javascript library to read DSV file test.log to input data
* D3.js plots SVG graph online :)