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IM 2558A-01EN
Failure to comply with the precautions below could lead to injury
or death or damage to the instrument.
WARNING
Use the Instrument Only for Its Intended Purpose
This instrument is an AC voltage and current standard that generates AC voltage and AC
current. Use this instrument only for this purpose.
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 source voltage matches the rated supply
voltage of the 2558A and that it is within the maximum rated voltage of the provided power cord.
Use the Correct Power Cord and Plug
To prevent electric shock and fire, be sure to use a power cord provided 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 Use When the Protection Functions Are Defective
Before using this instrument, check that the protection functions, such as the protective
grounding and fuse, are working properly. If you suspect a defect, do not use 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 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 target device or to an
external control unit. Before touching the target device, turn off this instrument and check that
there is no voltage or current being generated.
Measurement Category
The measurement category of the 2558A terminals is Other (O). Do not use it for main power
supply circuits or circuits that fall under Measurement Categories II, III, and IV.
Install or Use the Instrument in Appropriate Locations
• Do not install the instrument outdoors or in locations subject to rain or water. Or, use the
instrument in such locations.
• Install the instrument so that you can immediately remove the power cord if an abnormal or
dangerous condition occurs.
Safety Precautions
