Test 2 with 390K tempco tweak resistor.

FX-1 module temperature box test, GPIB code running on DE1-SoC + NI GPIB-USB-HS FC

3458's TCV 10V Result = <0.05 ppm/K

K2002-4 TCV 20V result =

Config : LTZ1000A, LT1013ACN8, 1K AE XB BMF, 15K AE XB BMF, two S102 in parallel to get 132R
Powered by K2400 at 12.00VDC Icmpl=105mA, LT3042 onboard used
PID settings: KP=140, KI=0.1, KD=0.9, Max TEC voltage = 10.5V, Max TEC Current = 1.3A, YSI 44006 current = 100E-6 A

Reference levels:
LTZ1000A Module FX3 REF = 7.16834040 VDC;
LTZ1000A Module FX3 REF = 7.16834181 VDC;

Result CSV-data


* 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 :)