Hioki LR8402-20 - 1.4 Basic Operation; Chapter 10 Connection to a PC (Communication)

Operating Precautions
10
Connecting to the Analog Input Terminals
Connection Precautions
Do not leave the HiLogger connected to test objects in environments
where a voltage surge might exceed the dielectric withstand voltage.
Doing so could result in damage to the HiLogger, bodily injury or
fatal accident.
• This instrument is not drip-proof. To prevent liquid including water
from entering the instrument, in particular, drop measurement
cables down below the instrument.
• 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 HiLogger.
• To avoid shock and short circuits, turn off all power before connect-
ing measurement cables.
• Do not connect a cable to the HiLogger while it is connected to the
obj
ect to be measured. Otherwise, an electric shock accident may
occur.
• To avoid short-circuit accidents, make
certain that connections are
secure.
• To avoid electric shock and short-circuit accidents, always close
t
he analog input terminal cover and tighten the screws.
• To avoid electric shock, use the recommended wire type to connect
to the current input terminals, or otherwise ensure that the wire
used has sufficient current handling capacity and insulation.
• Channels are insulated by semiconduc
tor relays. When a voltage
beyond the specification is applied between the channels, the semi-
conductor relay may short circuit. Please
ensure that a voltage
beyond specification, especially a surge such as a lightning, is
never applied. When an abnormal measurement value is observed,
please contact your dealer or Hioki representative for inspection.
• Measurements may be affected by noise or other electromagnetic
ingress if input leads are longer than about three meters.
• Route measurement leads and cables as far away as possible from
power and earth lines.
• Measurement values may be scattered if the leads are routed in parallel
with other devices. If they must be parallel, check operation before taking
measurements.