12
Operating Precautions
*IP40:
This indicates the degree of protection provided by the enclosure of the
device against use in hazardous locations, entry of solid foreign objects,
and the ingress of water.
4: Protected against access to hazardous parts with wire measuring 1.0
mm in diameter. The equipment inside the enclosure is protected
against entry by solid foreign objects larger than 1.0 mm in diameter.
0: The equipment inside the enclosure is not protected against the harmful
effects of water.
• This instrument is designed for use indoors. It can be
operated at temperatures between -25°C and 65°C (for
IR4053, between 0°C and 50°C) without degrading safety.
• For safety reasons, when taking measurements, only use the
L9787, L9788-11 or optional test lead provided with the instrument.
• To avoid breaking the test lead, do not bend or pull them.
• To avoid damage to the instrument, protect it from physical
shock when transporting and handling. Be especially careful
to avoid physical shock from dropping.
• Do not bring the tips of test leads into contact with the control
terminal that is used to connect a test lead with a remote
control switch. Doing so may damage the instrument.
• Do not slant the instrument or place it on top of an uneven
surface. Dropping or knocking down the device can cause
injury or damage to the instrument.
• If the protective functions of the instrument are damaged, either
remove it from service or mark it clearly so that others do not
use it inadvertently.
• To avoid damaging the cables, unplug it by grasping the con-
nector, not the cable.
• Although this instrument is dust resistant, it is not completely
dust- or waterproof. To prevent possible damage, avoid using
in dusty or wet environments.
• The protection rating for the enclosure of this device (based
on EN60529) is *IP40.
The battery indicator flashes when the remaining
battery capacity is low. In this case, measurement
is not possible. Replace the batteries. (p.68)
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