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IM WT310-02EN
Failure to comply with the precautions below could lead to injury
or death.
WARNING
Use the Instrument Only for Its Intended Purpose
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 as a power measurement instrument.
Check the Physical Appearance
Do not use the instrument if there is a problem with its physical appearance.
Use the Correct Power Supply
Make sure that the power supply voltage matches the instrument’s rated supply voltage and
that it does not exceed the maximum voltage range specified for the power cord.
Use the Correct Power Cord and Plug
To prevent the possibility of electric shock or fire, be sure to use the power cord supplied by
YOKOGAWA. The main power plug must be plugged into an outlet with a protective earth
terminal. Do not invalidate this protection by using an extension cord without protective earth
grounding.
Additionally, do not use the power cord supplied with this instrument with another instrument.
Connect the Protective Grounding Terminal
Make sure to connect the protective earth to prevent electric shock before turning on the
power. The power cord that comes with the instrument is a three-prong type power cord.
Connect the power cord to a properly grounded three-prong outlet.
Do Not Impair the Protective Grounding
Never cut off the internal or external protective earth wire or disconnect the wiring of the
protective earth terminal. Doing so may result in electric shock or damage to the instrument.
Do Not Operate with Defective Protective Grounding or Fuses
Do not operate the instrument if the protective earth or fuse might be defective. Check the
grounding and the fuse before operating the instrument.
Do Not Operate in an Explosive Atmosphere
Do not operate the instrument in the presence of flammable gasses or vapors. Doing so is
extremely dangerous.
Do Not Remove Covers
Only qualified YOKOGAWA personnel should remove the instrument’s covers. The inside of
the instrument is dangerous because parts of it have high voltages.
Ground the Instrument before Making External Connections
Securely connect the protective grounding before connecting to the item under measurement
or to an external control unit. Before touching a circuit, turn off its power and check that it has
no voltage.
Measurement Category
This instrument is a measurement category II product. Do not use it for measurement category
III or IV measurements.
Install or Use the Instrument in Appropriate Locations
•
Do not install or use the instrument outdoors or in locations subject to rain or water.
• Install the instrument so that you can immediately remove the
power cord if an abnormal or
dangerous condition occurs.
Safety Precautions
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