Instructions

9
3. Safety
This instrument is Safety Class I according to IEC classification and has been designed to meet
the requirements of EN61010−1 (Safety Requirements for Electrical Equipment for
Measurement, Control and Laboratory Use). It is an Installation Category II instrument intended
for operation from a normal single phase supply.
This instrument has been tested in accordance with EN61010−1 and has been supplied in a safe
condition. This instruction manual contains some information and warnings which have to be
followed by the user to ensure safe operation and to retain the instrument in a safe condition.
This instrument has been designed for indoor use in a Pollution Degree 2 environment in the
temperature range 5°C to 40°C, 20% −80% RH (non−condensing). It may occasionally be
subjected to temperatures between +5° and −10°C without degradation of its safety. Do not
operate while condensation is present.
It has been designed for CAT II (Measurement and Overvoltage Category II) use to 300Vrms.
CAT II is local domestic supply level, e.g. portable equipment and appliances.
For this equipment 2500V is the maximum peak transient overvoltage that can be tolerated by
any load input terminal with respect to earth ground without impairing safety.
Use of this instrument in a manner not specified by these instructions may impair the safety
protection provided.
Do not operate the instrument outside its rated supply voltages or environmental range.
WARNING! THIS INSTRUMENT MUST BE EARTHED
Any interruption of the mains earth conductor inside or outside the instrument will make the
instrument dangerous. Intentional interruption is prohibited. The protective action must not be
negated by the use of an extension cord without a protective conductor.
When the instrument is connected to its supply, terminals may be live and opening the covers or
removal of parts (except those to which access can be gained by hand) is likely to expose live
parts. The apparatus shall be disconnected from all voltage sources before it is opened for any
adjustment, replacement, maintenance or repair.
Any adjustment, maintenance and repair of the opened instrument under voltage shall be
avoided as far as possible and, if inevitable, shall be carried out only by a skilled person who is
aware of the hazard involved.
If the instrument is clearly defective, has been subject to mechanical damage, excessive
moisture or chemical corrosion the safety protection may be impaired and the apparatus should
be withdrawn from use and returned for checking and repair.
The instrument contains both encapsulated fuses and non-resetting thermal fuses; these are not
replaceable by the user. The short-circuiting of these protective devices is prohibited.
Do not wet the instrument when cleaning it.
The following symbols are used on the instrument and in this manual:−
Caution Refer to the accompanying
documentation, incorrect
operation may damage the
instrument.
CAT II
Measurement and Overvoltage
Category II (300V)
Alternating Current.
Chassis ground.
Mains supply OFF.
l
Mains supply ON.