VOLTCRAFT ST-100 Notice D'emploi page 30

CAT II Measuring category II for measurements on electric and electronic devices con-
nected to the mains supply with a mains plug. This category also covers all lower categories
(e.g. CAT I for measuring signal and control voltages). Measuring operation is permissible with-
out cover cops at the measuring prods.
CAT III Measuring category III for measuring in building installation (e.g. outlets or sub-
distribution). This category also covers all lower categories (e.g. CAT II for measuring electronic
devices). Measuring operation is only permissible with cover cops at the measuring prods.
For safety and approval reasons (CE), unauthorised conversion and/or modifi cation of the de-
vice is not permitted.
Consult an expert when in doubt as to the operation, safety or the connection of the device.
Meters and accessories are not toys and have no place in the hands of children!
At industrial sites, the accident prevention regulations of the association of the industrial work-
ers' societies for electrical equipment and utilities must be followed.
In schools, training centres, computer and self-help workshops, handling of meters must be
supervised by trained personnel in a responsible manner.
Ensure before every voltage measurement that the meter is set to a measuring range for current
The voltage between the measuring device and earth potential must not exceed 600 V DC/
AC in CAT III.
When using the measuring lines without cover caps, measurements must not be performed
above the measuring category CAT II. When measuring in the measuring category CAT III, the
cover caps must be pushed onto the measuring prods to void accidently short circuits during
measurement.
Push the cover caps onto the measuring prods until they latch. To remove, pull the caps fro the
prods with a little force.
The measuring prods have to be removed from the measured object every time the measuring
range is changed.
Be especially careful when dealing with voltages higher than 50 V alternating (AC) or
>75 V direct voltage (DC)! Even at these voltages it is possible to receive a potentially fatal
electric shock if you touch electrical conductors.
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