Operating Precautions
9
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 across the current
input terminals (between I and ±). Using the instrument with a faulty wiring will dam-
age 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 to 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 authorized Hioki distributor or reseller.
When connecting cables to the input terminals, the communication connectors, or the
external I/O terminals, observe the following to avoid electric shock and short circuits.
• Always turn off the power to the instrument and any device to be connected before
making connections.
• Be careful to avoid exceeding the ratings of the input terminals or external control
terminals.
• During operation, a wire becoming dislocated and contacting another conductive
object can be serious hazard. Use the screws to secure the communication connec-
tors.
For safety reasons, disconnect the power cord when the instrument is not used and before
connecting it to a device to be tested.
• To avoid damage to the instrument, do not input the voltage to the output terminals. Also do
not short between any terminals.
• When the instrument is turned off, do not apply voltage or current to the instrument. Doing
so may cause the instrument to become hot, resulting in burns or damage to the instru-
ment. (p.36)
• Do not connect or disconnect the current sensor or disconnect or connect the connection
cord from the 9555-10 Sensor Unit while power is being supplied to the instrument or 9555-
10. Doing so may damage the instrument, current sensor, or 9555-10.
• Do not input current to the current sensor when it is not connected to the instrument or
when the instrument and 9555-10 Sensor Unit are turned off. Doing so may damage the
current sensor, instrument, or 9555-10 Sensor Unit.
The instrument and input terminals may become hot when a large voltage or current is input.
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