Anritsu 681XXC - Manual (Page 5)

Safety-2 681XXC OM
There are no operator serviceable components inside. Refer
servicing of the instrument to qualified service technicians.
To prevent the risk of electrical shock or damage to precision
components, do not remove the equipment covers.
WARNING
When supplying power to this equipment, always use a
three-wire power cable connected to a three-wire power line
outlet. If power is supplied without grounding the equip-
ment in this manner, there is a risk of receiving a severe or
fatal electric shock.
WARNING
For Safety
Before changing the fuse, always remove the power cord
from the power outlet. There is the risk of receiving a fatal
electric shock if the fuse is replaced with the power cord
connected.
Always use a new fuse of the type and rating specified by
the fuse markings on the rear panel of the instrument.
WARNING
Use two or more people to lift and move this equipment, or
use an equipment cart. There is a risk of back injury, if this
equipment is lifted by one person.
WARNING
If the equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment
may be impaired.
WARNING