Hioki ST5540, Instruction Manual, Page: 42 / 326

3.3 Connecting equipment under test to the instrument
36
The actual connection procedure will vary with the power supply of the equipment under test. A cord to
connect the instrument and the equipment under test is not supplied. Use a power cord that suits the
power supply of the equipment under test.
When connecting the HiTESTER to equipment under test with a power cord, use the terminal
block.
3.3 Connecting equipment under test to
the instrument
• To avoid electrical accidents, confirm that all connections are secure.
The increased resistance of loose connections can lead to overheating
and fire.
• To avoid electric shock or damage to the equipment, always observe the
following precautions when connecting to external terminals.
Always turn off the power to the instrument and to any devices to be con-
nected before making connections.
Be careful to avoid exceeding the ratings of external terminals and con-
nectors.
During operation, a wire becoming dislocated and contacting another
conductive object can be serious hazard. Make sure that connections are
secure and use screws to secure the external connectors.
• The permissible current for the terminal block is 20 A. Current exceeding
this limit will trip the breaker and shut down the power supply of the
equipment under test.
Connect the terminal
• L (Line), N (Neutral) and G (Ground) are indicated on the terminal block of the
instrument, and the contacts of the power cord of the device to be measured
are denoted L, N and G. Connect the wires as shown below. Other wiring con-
figurations may cause electric shock or damage.
• If the power cord does not include an Ground (G) line, connect only the L and
N terminals.
• When reinstalling the terminal block cover, hang the connected wires straight
down to prevent the wires from being pinched by the cover. Otherwise, the
wires may be disconnected when pinched by the cover.
• To avoid the risk of electric shock and short-circuiting, use the supplied power
cord to connect the measurement line and voltage input terminal.
L N G
N
E
L
HiTESTER
Terminal block
Power cord (cable case)