KYORITSU 2413F - Manual (Page 5)

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CAUTION
●Make sure that the function selector switch is set to an
appropriate position before making measurement.
●Be sure to set the function selector switch to the “OFF”
position after use. When the instrument will not be use for a long
period of time, place it in storage after removing the battery.
This is to avoid damage to the instrument by possible leakage
from the battery.
●Do not expose the instrument to the direct sun, extreme
temperatures or dew fall.
●Placing the instrument in temperatures of 50℃ or higher can
cause the instrument's case to deform and result in operation
failures.
●Never apply voltage to the OUTPUT terminal. the terminal is not
electrically isolated from the internal circuits of the instrument.
○ Measurement categories (Over-voltage categories)
To ensure safe operation of measuring instruments, IEC61010
establishes safety standards for various electrical environments,
categorized as CAT
Ⅰ to CATⅣ, and called measurement
categories. Higher-numbered categories correspond to electrical
environments with greater momentary energy, so a measuring
instrument designed for CAT
Ⅲ environments can endure greater
momentary energy than one designed for CAT Ⅱ.
CAT Ⅰ : Secondary electrical circuits connected to an AC electrical
outlet through a transformer or similar device.
CAT Ⅱ : Primary electrical circuits of equipment connected to an
AC electrical outlet by a power cord.
CAT Ⅲ : Primary electrical circuits of the equipment connected
directly to the distribution panel, and feeders from the
distribution panel to outlets.
CAT Ⅳ :The circuit from the service drop to the service entrance,
and to the power meter and primary over-current
protection device (distribution panel).
Incoming wire
CAT.IV
Interior wiring
Transformer
CAT.I
CAT.II
CAT.III
Socket