HP 83447A User's And Service Manual page 34

C A U T I O N
Power cable
W A R N I N G
Installation and Preparation for Use
Installing the HP 83447A
Step 4. Connect the HP 83447A to a power source
Do not
Characteristic
Failure to ground the lightwave receiver properly can result in personal
injury. Before turning on the lightwave receiver, you must connect its
protective earth terminals to the protective conductor of the main power
cable. Insert the main power cable plug only into a socket outlet that has
a protective earth contact.
by using an extension cable, power cable, or autotransformer without a
protective ground conductor.
If you are using an autotransformer, make sure its common terminal is
connected to the protective earth contact of the power source outlet
socket.
Table 2-1. HP 83447A Power Requirements
Do not
defeat the earth-grounding protection
Requirement
6