Initial warmup of M8508A

Initial tests of 8508A vs 3458B2/HULK

HP2 = digitizer 3458B-2, DCV 10V, NPLC200
F8508A, DCV 10, 8.5digit slow-mode AVG0 filter, 4-wire mode from 10:15 pm 8/7/2018

Reference levels:

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 :)