Usage Notes
7
Handling the cords and current sensors
Connect the current sensors or voltage cords to the instrument first, and then to
the active lines to be measured. Observe the following to avoid electric shock
and short circuits.
• Do not allow the voltage cord clips to touch two wires at the same time. Never
touch the edge of the metal clips.
• When the current sensor is opened, do not allow the metal part of the clamp to
touch any exposed metal, or to short between two lines, and do not use over
bare conductors.
• To avoid short circuits and potentially life-threatening hazards, never attach the
current sensor to a circuit that operates at more than the maximum rated volt-
age to earth (See your current sensor's instruction manual for its maximum rat-
ings.) Current sensor and voltage cables 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.
• Connect only those voltage cables necessary for measurement.
In order to use the 9709 AC/DC Current Sensor, the line to be measured must be
temporarily disconnected.
To avoid shock and short circuits,turn off the power to lines to be measured
before making connections to terminals to be measured and turning on the
instrument.
• To avoid electric shock and short-circuit accidents, use only the specified voltage
cord to connect the instrument input terminals to the circuit to be tested.
• For safety reasons, when taking measurements, only use the optional voltage cord.
• Avoid stepping on or pinching cables, which could damage the cable insulation.
• To avoid breaking the cables, do not bend or pull them.
• To prevent an electric shock accident, confirm that the white or red portion (insula-
tion layer) inside the cable is not exposed. If a color inside the cable is exposed, do
not use the cable.
• To avoid damaging the power cord, grasp the plug, not the cord, when unplugging it
from the power outlet.
• Keep the cables well away from heat sources, as bare conductors could be exposed
if the insulation melts.
• Be careful to avoid dropping the current sensors or otherwise subjecting them to
mechanical shock, which could damage the mating surfaces of the core and
adversely affect measurement.
• Be careful when handling the cords, since the conductor being measured may
become very hot.
• When disconnecting the connector, be sure to release the lock before pulling off the
connector. Forcibly pulling the connector without releasing the lock, or pulling on the
cable, can damage the connector.
• To prevent damage to the instrument and current sensors, never connect or discon-
nect a sensor while the power is on, or while the sensor is clamped around a con-
ductor.
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