Hioki PW3336-01, Instruction Manual

Page: 13 / 206

Operating Precautions
7
Observe the following to avoid electric 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.
• Be sure to connect the voltage input and current input terminals correctly. An incor-
rect connection could damage or short circuit this instrument.
• When connecting wires to the voltage input terminals, be careful to avoid shorting
between one terminal and another with the wires.
• Since the screws of the terminals could be loosened, do not move the cables con-
nected to the terminals more than neccessary.
• Do not tie the cables connected to the input terminals in a bundle with the power
supply cord, the communication cables, the external I/O cables, or the current sen-
sor cables. This may cause damage.
• Avoid stepping on or pinching cables, which could damage the cable insulation.
• To avoid breaking the cables, do not bend or pull them.
• 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.
Before Connecting
• Before turning the instrument on, make sure the supply voltage matches that indi-
cated on its power connector. Connection to an improper supply voltage may dam-
age the instrument and present an electrical hazard.
• To avoid electrical accidents and to maintain the safety specifications of this instru-
ment, connect the power cord provided only to a 3-contact (two-con ground)
outlet.
See: Connection Methods : 2.3 Connecting the Power Cord (p.34)
• Use only the designated power cord with this instrument. Use of other power cords
may cause fire.
• Avoid using an uninterruptible power supply (UPS) or DC/AC inverter with rectangu-
lar wave or pseudo-sine-wave output to power the instrument. Doing so may dam-
age the instrument.
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.