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Warning
For use in measurement category I (CAT I) only. Do not use in
measurement category II/III/IV. Use this device to connect signals or
make measurements.
Measurement Categories
Measurement categories Note
Measurement categories I (CAT I) means that measurements are made on a circuit that is not directly
connected to the main power supply. For example, a circuit that is not exported from the main power
supply, especially a circuit that is exported from a protected (internal) primary power supply, is
measured. In the latter case, the instantaneous stress will change. Therefore, the user should be aware
of the instantaneous affordability of the device.
Measurement categories II (CAT II) means that measurements are made on a circuit that is directly
connected to a low-voltage device. For example, a measurement on household appliances, portable
tools and similar equipment.
Measurement categories III (CAT III) means that measurements are made in construction equipment.
For example, a measurement on the distribution boards, circuit breakers, wiring (including cables,
Busbars, junction boxes, switches, sockets) in fixed equipment and equipment for industrial use and
certain other equipment (for example, fixed motors that are permanently connected to fixtures).
Measurement categories IV (CAT IV) means that measurements are made on the source of low-
voltage equipment. For example, a measurement on a meter, a major overcurrent protection device,
and a pulse control unit.
