User Manual

Key Features and Key Specifications
R&S
®
RTH
10Getting Started 1326.1561.02 ─ 03
●
The risk of causing a short circuit while measuring multiple signals is reduced
substantially.
●
When measuring signals with different grounds, the induced ground currents
are kept to a minimum.
1.4
Measurement Categories
To ensure safe operation of measurement instruments, IEC 61010-2-030 defines
particular safety requirements for testing and measuring circuits. The standard
introduces measurement categories that rate instruments on their ability to resist
short transient overvoltages that occur in addition to the working voltage of the
instrument and can exceed the working voltage many times over.
Measurement categories are distinguished as follows:
●
O - Instruments without rated measurement category
For measurements performed on circuits not directly connected to mains, for
example, electronics, circuits powered by batteries, and specially protected
secondary circuits. This measurement category is also known as CAT I.
●
CAT II:
For measurements performed on circuits directly connected to the low-voltage
installation by a standard socket outlet, for example, household appliances
and portable tools.
●
CAT III:
For measurements performed in the building installation, such as junction
boxes, circuit breakers, distribution boards, and equipment with permanent
connection to the fixed installation.
●
CAT IV:
For measurements performed at the source of the low-voltage installation,
such as electricity meters and primary overcurrent protection devices.
Measurement Categories