Operating Precautions
8
Input and Measurement
• 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 personal injury.
• 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 terminals could
destroy the instrument and result in personal injury or death.
• To avoid the danger of electric shock, do not input a signal in excess of the ratings
to the external I/O terminals.
• 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.
When connecting
Observe the following to avoid electric shock and short circuits.
• Turn off the power to lines to be measured before making connections to input ter-
minals and turning on the instrument.
• When making connections, do not mix up the voltage input terminals (U) and the
current input terminals (I). In particular, do not input a voltage into the current input
terminals (between I and ±). Using the instrument with a faulty wiring will damage
the instrument or cause injury.
• Be careful to avoid shorting between the voltage input terminals with the wires.
When abnormalities such as smoke, unusual noise, or unusual odor are
observed
Stop the measurement immediately, and observe the following procedure. Using the
instrument in such a abnormal condition could cause death or injury.
1. Turn off the power switch of the instrument.
2. Disconnect the power cord from the outlet.
3. Turn off the power to the line to be measured.
Remove the measurement cables.
4. Contact your dealer or Hioki representative.
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