Pre-use inspection

Inspect the instrument and wireless module before turning them on to check for damage during storage or shipping.

If you find any damage, contact your authorized Hioki distributor or reseller.

Inspection of peripheral equipment

Do the measurement cables you’re about to connect have tears in their insulation, or is any metal exposed?

If you find any damage, do not use the measurement cable. Doing so could cause electric shock. Replace the cable with the designated type.

Inspection of the instrument

Does the instrument exhibit any damage?
If you find any damage, have the instrument repaired.
When you turn on the instrument, does the screen work?
If no screen is displayed, there may be a wiring break in the power cord, or the instrument may be damaged. Have it repaired.

Handling of cords and cables

WARNING
Ensure measurement cables hang lower than the instrument. Failure to do could allow water or other liquids to travel down the measurement cables into the instrument, resulting in damage or bodily injury. Before connecting measurement cables to measurement terminals or turning on the instrument, follow the procedure below: Shut off the power to the measurement lines. Turn off all equipment. Remove the measurement cables from measurement targets. Close the terminal block cover. (Other than U8555, U8556, LR8535, or LR8536) Use specified wiring only. Alternatively, use wiring that provides sufficient dielectric strength and current capacity. Failure to do so may result in electric shock or a short-circuit. Surely connect measurement cables to the input terminals. A loosened screw could cause contact resistance to increase and thus the instrument to overheat, resulting in bodily injury, burning of the instrument, or fire.

WARNING

Ensure measurement cables hang lower than the instrument.

Failure to do could allow water or other liquids to travel down the measurement cables into the instrument, resulting in damage or bodily injury.

Before connecting measurement cables to measurement terminals or turning on the instrument, follow the procedure below:

Shut off the power to the measurement lines.
Turn off all equipment.
Remove the measurement cables from measurement targets.
Close the terminal block cover. (Other than U8555, U8556, LR8535, or LR8536)

Use specified wiring only. Alternatively, use wiring that provides sufficient dielectric strength and current capacity.

Failure to do so may result in electric shock or a short-circuit.

Surely connect measurement cables to the input terminals.

A loosened screw could cause contact resistance to increase and thus the instrument to overheat, resulting in bodily injury, burning of the instrument, or fire.

CAUTION
Do not step on cords or allow them to become caught between other objects. Doing so may damage insulation, resulting in bodily injury. Do not apply a voltage exceeding the specifications between channels. Modules whose channels are isolated from one another incorporate semiconductor relays. Subjecting these modules to a voltage exceeding the voltage specified in the instrument’s specifications could cause a short circuit fault of the semiconductor relays.

CAUTION

Do not step on cords or allow them to become caught between other objects.

Doing so may damage insulation, resulting in bodily injury.

Do not apply a voltage exceeding the specifications between channels.

Modules whose channels are isolated from one another incorporate semiconductor relays. Subjecting these modules to a voltage exceeding the voltage specified in the instrument’s specifications could cause a short circuit fault of the semiconductor relays.

IMPORTANT

Measurement may be affected by the EMC environment, for example external noise, when connecting cables of greater than 3 m in length. Keep cables away from power lines and ground lines.
Measured values may exhibit variability when cables are connected in parallel with other devices. Be sure to verify proper operation when connecting cables in parallel.

When connecting cords to the input terminals

DANGER
Do not leave input cords connected in environments where there is the possibility of a surge exceeding the dielectric strength. Doing so may damage the instrument, resulting in serious bodily injury.

DANGER

Do not leave input cords connected in environments where there is the possibility of a surge exceeding the dielectric strength.

Doing so may damage the instrument, resulting in serious bodily injury.

WARNING
Before connecting measurement cables to the input terminals, follow the procedure below: Turn off the instrument and all equipment to be connected. Eliminate static electricity from the body. Failure to do so could cause electric shock or damage to the instrument.

WARNING

Before connecting measurement cables to the input terminals, follow the procedure below:

Turn off the instrument and all equipment to be connected.
Eliminate static electricity from the body.

Failure to do so could cause electric shock or damage to the instrument.

When using wires with crimp terminals, use insulated terminals designed for use with M3 screws in the following sizes:

When connecting cables to the external control terminals

WARNING
Before connecting cables to the external control terminals, follow the procedure below: Turn off the instrument and all equipment to be connected. Eliminate static electricity from the body. Make sure that the signals do not exceed the rating of the external input/output. Appropriately isolate the equipment to be connected Failure to do so could cause electric shock or damage to the instrument.

WARNING

Before connecting cables to the external control terminals, follow the procedure below:

Turn off the instrument and all equipment to be connected.
Eliminate static electricity from the body.
Make sure that the signals do not exceed the rating of the external input/output.
Appropriately isolate the equipment to be connected

Failure to do so could cause electric shock or damage to the instrument.

CAUTION
Do not short-circuit the output terminal or input a voltage to the output terminal. Failure to do so could damage to the instrument.
Take appropriate measures so that the ground of the external control terminal and that of targets to be connected have the same potential. Failure to do so could cause damage to the targets to be connected and the instrument. The external control terminals share the ground with the instrument: the grounds of them are not insulated from one another.

CAUTION

Do not short-circuit the output terminal or input a voltage to the output terminal.

Failure to do so could damage to the instrument.

Take appropriate measures so that the ground of the external control terminal and that of targets to be connected have the same potential.

Failure to do so could cause damage to the targets to be connected and the instrument.

The external control terminals share the ground with the instrument: the grounds of them are not insulated from one another.

When using twisted-pair wiring for measurement cables, exercise care not to make contact with adjacent measurement cables or terminals.