5
Chapter 2
Operation
2.1 Connection of Mains Supply
Before connecting a mains supply, the following checks and adjustments should be carried out to
ensure safe operation of the instrument.
2.1.1 Main Voltage Settings
Type 4204 operates from either a 50 Hz or a 60 Hz mains supply of 100, 115, 127, 220 or 240 V
AC. The influence of mains voltage variations is discussed in section 3.4. The fuse and voltage
selector are located on the bottom panel of the instrument. If the position of the voltage selector does
not correspond to the local voltage, remove the central fuse using a small screwdriver and turn the
voltage selector to the required position using a wide-blade screwdriver or a small coin.
2.1.2 Mains Fuse Rating
The fuse holder in the centre of the voltage selector contains the mains fuse, which may be released
using a small screwdriver. For operation from 100 to 127 V supplies, the fuse should be a 12.5 A
slow blow (Brüel & Kjær part VF-0043), whilst for 200 to 240 V supplies it should be 6.3 A slow
blow (Brüel & Kjær part VF-0044). Make sure that only fuses of the required rate current and of the
specified type are used for replacement. The use of mended fuses or the short-circuiting of fuse
holders should be avoided.
2.1.3 Mains Cable Connections
Type 4204 is equipped with an integral mains cable. Once the mains voltage setting and fuse have
been checked, a mains plug compatible with the local regulations and fittings may be connected to
the live (brown) and neutral (blue) conductors of the mains input cable. For maximum operating
safety the protective (green/yellow) conductor of the mains cable should be connected to a suitable
earth, such as the protective earth contact of a mains socket outlet. The use of extension cables
without a protective conductor should be avoided.
In countries where use of mains socket outlets without protective conductor is standard, the mains
supply should incorporate an authorized earth leakage current circuit breaker.
Type 4204 can now be connected to the mains supply and started by setting the Power switch to On.
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