YOKOGAWA WT1800 User Manual page 10

Safety Precautions
Failure to comply with the precautions below could lead to injury
or death or damage to the instrument.
Check the Physical Appearance
Do not use the instrument if there is a problem with its physical appearance.
Use the Correct Power Supply
Before connecting the power cord, ensure that the power supply voltage matches the rated
supply voltage of the instrument and that it is within the maximum rated voltage of the
provided power cord.
Use the Correct Power Cord and Plug
To prevent fire and electric shock, only use a power cord supplied by YOKOGAWA. The main
power plug must be plugged into an outlet with a protective earth terminal. Do not disable 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
To prevent electric shock, be sure to connect to a protective earth terminal before turning on
the instrument's 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 poses a potential shock hazard.
Do Not Operate with Defective Protective Grounding or a Defective Fuse
Do not operate the instrument if protection features such as 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. Operation in
such an environment constitutes a safety hazard.
Fuse
To have the instrument's fuse replaced, contact your nearest YOKOGAWA dealer.
Do Not Remove the Covers or Disassemble or Alter the Instrument
Only qualified YOKOGAWA personnel may remove the covers and disassemble or alter the
instrument. 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.
Install or Use the Instrument in Appropriate Locations
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or dangerous condition occurs.
Measurement Category
The measurement category of the WT1800 signal input terminals is CAT II. Do not use it to
measure the main power supply or for Measurement Categories III, and IV.
Measurement category Other (O) applies to measurement of circuits that are not directly connected to
a main power supply.
This category applies to measurement of secondary electric circuits in equipment across a transformer.
Measurement category II applies to measurement of circuits, such as household electric appliances
and portable electric tools, that are connected to low-voltage installations.
Measurement category III applies to measurement of facility circuits, such as distribution boards and
circuit breakers.
Measurement category IV applies to measurement of power source circuits, such as entrance cables
to buildings and cable systems, for low-voltage installations.
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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
WARNING
IM WT1801-03EN