I recently bought a Agilent 16702B on ePay. This is just a collection of links and info as yet unorganized. If you have some useful comments please use this contact form https://www.rodaw.com/contact/
It turns out that the default password for that root entry is: "uh,uhuh" https://www.eevblog.com/forum/testgear/hp-agilent-16700a-16700b-16702a-16702b-root-password/J
Just use the Control+Alt+Shift+F8 keyboard shortcut to bring up an xterm window and then you can su to root using the default password and hack away.
Might be the jackpost; http://www.perdrix.co.uk/hp16700/