HIOKI 3120 PDF

The symbol printed on the instrument indicates that the user should refer to a corresponding topic in the manual marked with the symbol before using the relevant function. Indicates a double-insulated device. The following symbols in this manual indicate the relative impor- tance of cautions and warnings. Indicates that incorrect operation presents an extreme haz- ard that could result in serious injury or death to the user.

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The symbol printed on the instrument indicates that the user should refer to a corresponding topic in the manual marked with the symbol before using the relevant function. Indicates a double-insulated device. The following symbols in this manual indicate the relative impor- tance of cautions and warnings. Indicates that incorrect operation presents an extreme haz- ard that could result in serious injury or death to the user.

Indicates that incorrect operation presents a significant haz- ard that could result in serious injury or death to the user. Indicates that incorrect operation presents a possibility of injury to the user or damage to the device. Indicates advisory items related to performance or correct operation of the instrument. CAT II: Primary electrical circuits in equipment connected to an AC electrical outlet by a power cord portable tools, household appliances, etc.

CAT II covers directly measuring electrical outlet recep- tacles. CAT III:Primary electrical circuits of heavy equipment fixed installations connected directly to the distribution panel, and feeders from the distribution panel to outlets.

CAT IV: The circuit from the service drop to the service entrance, and to the power meter and primary overcur- rent protection device distribution panel. Using a measurement instrument in an environment desig- nated with a higher-numbered category than that for which the instrument is rated could result in a severe accident, and must be carefully avoided.

Usage Notes Follow these precautions to ensure safe operation and to obtain the full benefits of the various functions. Do not use it in an especially dusty environment, nor where it might be splashed with liquid.

This may cause dam- age. Be especially careful to avoid physical shock from dropping. A weak green light indicates dead battery. Replace the batteries im- mediately. Attempting to measure voltages exceeding V with respect to ground could damage the instrument and result in personal injury.

Be sure to check its performance using a known power source e. It will not work using an earthed wire or neutral point. If there are several lines, such as 2-phase wires and 3-phase wires, perform voltage detection on each line separately. But, do not touch the portion beyond the barrier. It will not produce any detection. See the right figure.

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