Operating Precautions
18
When connecting to external control terminals
To avoid electric shock or damage to the equipment, always
observe the following precautions when connecting to external
control terminals.
• Always turn off the power to the instrument and to any devices
to be connected before making connections.
• Be careful to avoid exceeding the ratings of external control ter-
minals.
• Ensure that devices and systems to be connected to the exter-
nal control terminals are properly isolated.
• The ground of external control terminals and the ground of the
instrument are common and not isolated.
To prevent damage to the instrument, use a grounded power
cord for the device to be connected with the external control ter
-
minals and this instrument, and supply power from the same
line. Using different lines or an ungrounded power cord may
result in a potential difference between the grounds depending
on the wiring state, and current flowing through the wiring mate
-
rial may lead to damage of the measurement object or instru-
ment.
• To prevent an electrical accident, use wiring material that has
more than enough dielectric strength and current-carrying
capacity.
If a cable of 3 meters or longer is connected, the instrument may be
susceptible to the interference of external noise and other EMC envi
-
ronmental factors.
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