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IM DLM3054-03EN
Ground the Instrument before Making External Connections
Securely connect the protective grounding before connecting to the item under measurement
or to an external control unit. Before touching a circuit, turn off its power and check that it
has no voltage. To prevent electric shock and accidents, connect the ground of the probes
or input connectors to the ground potential of the device under measurement. The ground of
each signal input terminal (input connector) of this instrument is common with the instrument’s
protective ground (see the block diagram in appendix 3). Do not apply floating potential
signals to the input connector ground. This is extremely dangerous as doing so will cause a
short to the ground potential.
Measurement Category
The measurement category of this instrument’s signal input terminals is Other (O). Do not use
it to measure the main power supply or for Measurement Categories II, III, and IV.
Install or Use the Instrument in Appropriate Locations
• Do not install or use the instrument outdoors or in locations subject to rain or water.
• Install the instrument so that you can immediately remove the power cord if an abnormal or
dangerous condition occurs.
Manual CD
Never play this manual CD, which contains the user’s manuals, in an audio CD player.
Doing so may cause loss of hearing or speaker damage due to the large sounds that may be
produced.
Accessories
Use the accessories specified in this manual. Moreover, use the accessories of this product
only with Yokogawa products that specify them as accessories.
Do not use faulty accessories.
CAUTION
Operating Environment Limitations
This product is a Class A (for industrial environment) product. Operation of this product in a
residential area may cause radio interference in which case the user will be required to correct
the interference.
Safety Precautions
