Operating Precautions
6
Handling the Instrument
To avoid electric shock, do not remove the instrument's case.
The internal components of the instrument carry high voltages and may become very
hot during operation.
• Do not allow the instrument to get wet, and do not take measurements with wet
hands. This may cause an electric shock.
• Touching any of the high-voltage points inside the instrument is very dangerous.
Do not attempt to modify, disassemble or repair the instrument ; as fire, electric
shock and injury could result.
• To avoid damage to the instrument, protect it from physical shock when transporting and
handling. Be especially careful to avoid physical shock from dropping.
• After use, always turn OFF the power.
• Do not allow any conductive foreign objects to enter through the vents. Doing so may
cause damage to the instrument.
This instrument may cause interference if used in residential areas. Such use must be avoided unless the
user takes special measures to reduce electromagnetic emissions to prevent interference to the reception of
radio and television broadcasts.
Handling the Cables
• The maximum input voltage is 1000 V DC/AC and the maximum input current to the
current direct input terminals is 70 A DC/AC.
Attempting to measure a voltage or current in excess of each of the maximum inputs
could destroy the instrument and result in personal injury or death.
• The maximum rated voltage between input terminals and the ground is as follows;
(CAT II) 1000 V DC, 1000 V AC
(CAT III) 600 V DC, 600 V AC
Attempting to measure voltages exceeding this level with respect to ground could
damage the instrument and result in personalnjury.
• The external current sensor input terminals are not insulated. The terminals are
exclusive to the optional current sensors. Attempting to input a voltage or current
other than the output from the optional clamp sensors into the external current sen-
sor terminals could destroy the instrument and result in personal injury or death.
• When using the optional current sensors, do not measure a current in excess of the
current rating. This could destroy the instrument, the current sensor, or both. Also
this coud result in personal injury or death.
• This instrument should only be connected to the secondary side of a breaker, so the
breaker can prevent an accident if a short circuit occurs. Connections should never
be made to the primary side of a breaker, because unrestricted current flow could
cause a serious accident if a short circuit occurs.
• To avoid electrical accidents, confirm that all terminals are secure. The increased
resistance of loose connections can lead to overheating and fire.
(Tightening torque of the input terminals: 3 N·m)
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