3-10
IM 2553A-01EN
3.5 Wiring Precautions
WARNING
• Ground the instrument before connecting the instrument to the target device. The power
cord to use is a three-prong type power cord. Insert the power cord into a grounded three-
prong outlet.
• Be sure to turn off the output before connecting or disconnecting the target device.
• To prevent damage that would occur if the OUTPUT switch is flipped inadvertently during
wiring, check that the output setting dials are all set to 0 (zero).
• Make sure to fasten the output terminal screws securely so that lead wires do not come
loose.
• Do not use lead wires whose conductive parts are exposed due to tears in the insulation or
broken cables as they may lead to a short circuit or electric shock.
• If a large inductive or capacitive load or oscillating circuit is connected to the output
terminals, the output may oscillate and cause high voltage to be applied to the output
terminals. If the output oscillates, turn off the OUTPUT switch immediately.
CAUTION
• Use lead wires that have adequate margins of withstand voltage and current capacity with
respect to the voltage or current to be sourced.
• Use twisted-pair lead wires to prevent oscillation.
• When using the 10 mV range or any of the thermocouple ranges, do not apply external
voltage or current. Doing so may damage the voltage divider inside the 2553A.
