Keysight E4416A/E4417A Power Meters Service Guide 5
Safety Symbols
The following symbol on the instrument and in the documentation indicates
precautions that must be taken to maintain safe operation of the instrument.
Caution, risk of danger.
The Instruction Documentation Symbol. The product is marked with this symbol
when it is necessary for the user to refer to the instructions in the supplied
documentation.
Alternating current (AC).
This symbol indicates the operating switch for ‘Stand-by’ mode. Note, the
instrument is NOT isolated from the mains when the switch is pressed.
To isolate the instrument, the mains coupler (mains input cord) should be removed
from the power supply.
This symbol indicates the operating switch for ‘On’ mode).
External Protective Earth Terminal.
While this is a Class I product, provided with a protective earthing
conductor in a power cord, an external protective earthing terminal has also been
provided. This terminal is for use where the earthing cannot be assured. At least an
18AWG earthing conductor should be used in such an instance, to ground the
instrument to an assured earth terminal.
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