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English
Multimeter
Art.no 36-5255
Model UT120A
Please read the entire instruction manual before use and save it for future reference.
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technical changes to this document. If you should have any questions concerning
technical problems please contact our Customer Services.
Information about the meter
The multimeter has been designed and tested in accordance with the requirements for
installation category II up to nominal voltages of 600V and a contamination level of 2.
Categorisation
Meters are divided into different categories depending on the electrical environment in
which they are to be used and how safe/protective they are in the event of a voltage
surge.
The meter label should indicate which category it belongs to. The categorisation also
determines how safe the instrument is with regard to any overvoltage which could
represent a hazard for the user.
The categorisation is described briefly below:
In the event of a voltage surge in the electricity grid (a transient from a lightning strike,
etc.), the risk will be greatest where the mains supply cable enters the building, for
example. Further inside the building, the resistance (impedance) in the cables will
increase and connected devices will reduce and dissipate the overvoltage. The meter
category will therefore determine which electrical environment the instrument is
designed to be used in.
The categories which meters are divided into are as follows:
•
Category I:
For measuring electronics and products that have inbuilt protection
against voltage surges.
•
Category II:
For measuring single-phase equipment which is fed via the building’s
electrical power supply system. Both plug-connected and permanently installed.
•
Category III:
For measuring the building’s electrical systems. Permanently installed
cables, sockets, fuse boxes and switchgear cabinets. Three-phase distribution (all
supply cables and three-phase equipment, machines and appliances).
•
Category IV:
Three-phase at primary level and all conductors for outdoor use.
This multimeter belongs to installation category II and is intended for measuring
voltages of up to 600V in single-phase products. The meter must not be used for
measuring three-phase products, three-phase conductors or switchgear cabinets
even if the nominal voltage does not exceed 600V.
