Safety Precautions
This instrument is an IEC safety class I instrument (provided with a terminal for protective earth
grounding).
The general safety precautions described herein must be observed during all phases of operation.
If the instrument is used in a manner not specified in this manual, the protection provided by the
instrument may be impaired. YOKOGAWA assumes no liability for the customer’s failure to comply
with these requirements.
The WT310/WT310HC/WT330 is a power measurement instrument that can measure parameters
such as voltage, current, and power. Do not use this instrument for anything other than its intended
purpose.
The following symbols are used on this instrument.
Warning: handle with care. Refer to the user’s manual or service manual. This symbol appears
on dangerous locations on the instrument which require special instructions for proper handling
or use. The same symbol appears in the corresponding place in the manual to identify those
instructions.
Electric shock, danger
Ground (earth) or functional ground terminal (do not use this terminal as a protective ground
terminal.)
Alternating current
Both direct and alternating current
ON (power)
OFF (power)
Power-on state
Power-off state
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