SIGLENT SHS1000X Series, Quick Start Manual, Page: 6 / 24

2 SHS800X/SHS1000X Quick Start
Measurement Category
IEC61010-2-030 defines the measurement category to rate the ability of measuring instruments to
withstand short-term transient overvoltage outside of the working voltage. This product and its
accessories can only be used in the environment of the nominal measurement category.

0-An instrument with no rated measurement category is used to measure circuits that are not
directly connected to the mains, such as a circuit board powered by a battery or a secondary
circuit with special protection. This measurement category is also called CAT
Ⅰ
.

CAT II
：
For measurements installed in buildings, such as junction boxes, circuit breakers, distribution
boards and equipment permanently connected to fixed installations.

CAT III:
Used for measurements installed in buildings, such as junction boxes, circuit breakers,
distribution boards and equipment that are permanently connected to fixed installations.

CAT IV:
It is used for measuring at the source of low-voltage devices, such as electricity meters and
primary overcurrent protection devices.