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Safety Information
Safety Information
Please review the safety information below before using the instrument. Read this manual carefully
and ensure you understand its contents before using the instrument. Improper use of the instrument
could result in serious bodily injury or damage to the instrument.
Measurement categories
IEC 61010 denes measurement categories to facilitate safe use of measuring instruments. Test
and measurement circuits designed to be connected to a main power supply circuit are classied
into three categories depending on the type of main power supply circuit. A measuring instrument
that does not have a measurement category cannot be used to measure a main power supply
circuit.
DANGER
Do not use a measuring instrument to measure a main power supply
circuit whose category exceeds the instrument’s rated measurement
category.
Do not use a measuring instrument that does not have a rated
measurement category to measure a main power supply circuit.
Doing so may result in serious bodily injury or damage to the instrument or other
equipment.
No measurement
category
(O)
Applicable to the measurement of other circuits that are not directly connected to the
main power supply.
EXAMPLE: Measurement on the secondary-side equipment from the socket outlet of
xed installation through a transformer, etc.
Measurement
category II
(CAT II)
Applicable to test and measuring circuits connected directly to utilization points (socket
outlets and similar points) of a low-voltage MAINS installation.
EXAMPLE: Measurements on household appliances, portable tools, and similar
equipment, and on the consumer side only of socket outlets in the xed
installation.
Measurement
category III
(CAT III)
Applicable to test and measuring circuits connected to the distribution part of the a
building’s low-voltage MAINS installation.
Example: Measurements on distribution boards (including secondary meters),
photovoltaic panels, circuit breakers, wiring, including cables, bus-bars,
junction boxes, switches, and socket outlets in a xed installation, as well as
equipment for industrial use and some other equipment such as stationary
motors with permanent connection to the xed installation.
Measurement
category IV
(CAT IV)
Applicable to test and measuring circuits connected at the source of the a building’s low-
voltage MAINS installation.
Example: Measurements on devices installed before the main fuse or circuit breaker in
the building installation.
Outlet
CAT II
Interior wiring
Distribution panel
Service entrance
Service drop
CAT IV
Power meter
CAT III
Fixed equipment
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