Operating instructions

MCO-5211 | 3
2 Safety
2.1 Safety Characteristics
This apparatus has been designed and tested in accordance with the Safety Class 1 requirements of IEC Publication
1010-1 ("Safety Requirements for Electrical Measuring Apparatus"), and is safe as supplied. This manual contains
information and warnings which must be followed during operation and maintenance in order to ensure operator and
service personnel safety.
2.2 Grounding
Before any other connection is made, the instrument must be connected to a protective ground conductor in one of
the following ways:
• via the three-core power cable
• via the protective ground terminal marked
Before connecting the equipment to the main power supply, make sure that the building is properly grounded.
WARNING: Any break in or disruption of the protective conductor inside or outside the instrument or dis-
connection of the protective ground terminal is likely to make the instrument dangerous. Intentional interruption is
prohibited.
2.3 Power Supply and Power Cord
This device is supplied with a power cord certified for the country to which it was sold. The user should use that cord, or
ensure that any replacement cord is appropriately certified.
No voltage setting of the equipment is necessary. The instrument is equipped with a tapless switched-mode power
supply that covers most nominal voltage ranges in use: 90-250V AC RMS. This eliminates the need to change anything
to adapt to the local power supply voltage.
The frequency required is 48-65Hz.
2.4 Fuses
WARNING: Please disconnect the instrument from all voltage sources before replacing a fuse.
Power fuse rating: 1.6A delayed action, 250V. The mains fuse holder is located on the rear panel of the instrument.
If the power fuse has to be replaced, proceed as follows:
1. Remove the mains cable.
2. Lift the plastic cover (fuse holder) using two small screwdrivers (simultaneously).
3. Remove the old fuse.
4. Insert the new fuse into the top of the fuse holder.
5. Replace the cover (fuse holder).