[Test-Equipment] HP 3468a cal procedure needed

[Don Moman]

I have a couple of 3468a DVM's... but no manuals.... one in cal and one
not.... (loss of backup battery). My question is what voltage needs to be
input for the cal and what is the key sequence required? in a few words or
less can someone tell me the cal procedure or point in a direction of
something I can download?  Google hasn't been of any help....

Thanks, Don
VE6JY