MR8740T_Quick guide_eng_20191016H.pdf - 第13页
7 Safety Information Measurement categories T o ensure safe operation of measuring instruments, IEC 61010 establishes safety standards for various electrical environments, categorized as CA T II to CA T IV , and called m…
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Safety Information
Safety Information
This instrument and modules are designed to conform to IEC 61010 Safety Standards, and has
been thoroughly tested for safety prior to shipment. However, using the instrument in a way not
described in this manual may negate the provided safety features.
Read the following safety notes carefully before using the instrument.
DANGER
Mishandling the instrument could result in bodily injury or even death, as well
as damage to the instrument. Familiarize yourself with the instructions and
precautions in this manual before using the instrument.
WARNING
Electricity can cause potentially serious events such as an electric shock,
heat generation, re, and an arc ash due to a short-circuit. If you have not
used electrical measuring instruments before, you should be supervised by a
technician who has experience in electrical measurement.
Protective gear
WARNING
Performing measurement using this instrument involves live-line work. To
prevent an electric shock, use appropriate protective insulation and adhere to
applicable laws and regulations.
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Safety Information
Measurement categories
To ensure safe operation of measuring instruments, IEC 61010 establishes safety standards
for various electrical environments, categorized as CAT II to CAT IV, and called measurement
categories.
DANGER
• Using a measuring instrument in an environment designated with a higher-
numbered category than that for which the instrument is rated could result in a
severe accident, and must be carefully avoided.
• Never use a measuring instrument that lacks category labeling in a CAT II to
CAT IV measurement environment. Doing so could result in a serious accident.
CAT II: When directly measuring the electrical outlet receptacles of the primary electrical
circuits in equipment connected to an AC electrical outlet by a power cord (portable
tools, household appliances, etc.).
CAT III: When measuring the primary electrical circuits of heavy equipment (xed installations)
connected directly to the distribution panel, and feeders from the distribution panel to
outlets.
CAT IV: When measuring the circuit from the service drop to the service entrance, and to the
power meter and primary overcurrent protection device (distribution panel).
T
Outlet
CAT II
Internal Wiring
Distribution Panel
Service Entrance
Service Drop
CAT IV
Power Meter
CAT III
Fixed Installation
The applicable measurement category is determined based on the module being used.
Refer to “Handling the instrument and modules” (p. 10).
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Operation Precautions
Operation Precautions
Follow these precautions to ensure safe operation and to obtain the full benets of the various
functions.
Checks before Use
DANGER
If the connection cords or the instrument is damaged, there is a risk of an electric
shock. Perform the following inspection before using the instrument:
• Check that the insulation of the connection cords are neither ripped nor torn
and that no metal parts are exposed before using the instrument. Using the
instrument under such conditions could result in an electric shock. Replace the
connection cords with those specied by our company.
• Check if there is any damage to the instrument occurred during storage or
shipping and verify that it operates normally before using the instrument. If you
nd any damage, contact your authorized Hioki distributor or reseller.
Installing the instrument and modules
WARNING
Installing the instrument in inappropriate locations could cause a malfunction of
the instrument an accident, or re. Avoid the locations that are:
• Exposed to direct sunlight or high temperatures
• Exposed to corrosive or combustible gases
• Exposed to strong electromagnetic elds or electrostatic charges
• Near induction heating systems (such as high-frequency induction heating
systems and IH cooking equipment)
• Susceptible to vibration
• Exposed to water, oil, chemicals, or solvents
• Exposed to high humidity or condensation
• Exposed to high quantities of dust particles
• Unplugging the power cord kills power to the instrument. Be sure to provide
enough unobstructed space to unplug the power cord immediately in an
emergency.
• Use M4 × 8 mm screws to x the rack-mount brackets on the MR8740-50.
Using a screw longer than 8 mm can cause damage to the inside of the instrument
or an electric shock.