Another bit of obsolete 80's vintage volt ref kit. Used as a travelling transfer standard for labs etc.
This sample is one of, (rescued!), quite a few that were tossed out a number of years back and has sat un used in a dark corner of my junk cupboard till now.
Some pics of the front, the rather large number of battery holders (18 D cells), the inside of the front terminals with some noise filtering. Also a series of pics
of the various covers being removed down to the REF pcb and its copper box holding the zener.
I tried to power it up from a bench supply to get a pic of a 34401 reading the outputs but before I got the camera the unit went
...............lol.
Noted the dipped tants. > odds on its one of them.