HP 33120A Installation Instructions Manual page 3

2 Carefully cut two holes in the rear-panel label.
The Ref Out and Ext Ref In terminals on the Phase-Lock assembly will
extend through these holes in the HP 33120A rear-panel.
Cut Out Holes
3 Connect the coaxial cable to the Phase-Lock circuit board.
Connect one end of the coaxial cable (included with the retrofit kit) to
the connector labeled P2 on the Phase-Lock circuit board. Position the
cable as shown.
P2
Coaxial Cable
(33120-61603)
P2
2