TX7168 setup, 10-resistor TCR test, GPIB code running on TFT-Pi + 82357B FC

Time Electronics 9823 MFC source 100.00 µADC to chain of 8 resistors (VHD 7.663KΩ/20 KΩ X8320 + VHD 7.663KΩ/20 KΩ X8318 + VHD 7.663KΩ/20 KΩ X8342 + VHD 7.663KΩ/20 KΩ R0301)
Keithley 7168 8-channel nanovolt scanner + RPI in K7001 chassis scanning voltage across each resistor in chain, CBM-way, 5s-1s-3s soak setting
Keithley 182-M measures voltage across resistor. Then MFC source -100.000 µADC current and voltmeter reads TEMF compensation voltage to calculate OCOMP OHM.
Keithley 2002 U2 measures 1 x S102 75.000 KΩ #1 BMFR, 200K range, OCOMP OFF
Keithley 2002 U1 measures 1 x S102 75.000 KΩ #2 BMFR, 200K range, OCOMP OFF


Reference levels:
var ref_ch1 = 7662.047 Ω - CH1
var ref_ch2 = 19996.726 Ω - CH2
var ref_ch3 = 7661.627 Ω - CH3
var ref_ch4 = 19995.998 Ω - CH4
var ref_ch5 = 7661.898 Ω - CH5
var ref_ch6 = 19996.885 Ω - CH6
var ref_ch7 = 7661.945 Ω - CH7
var ref_ch8 = 19997.435 Ω - CH8
var ref_k4 = 75000.972 Ω - 2002 K4
var ref_k6 = 75000.578 Ω - 2002 K6

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 :)