3. OPERATION
3.1. PRELIMINARY ADJUSTMENTS
Before connecting a mains supply the following checks and adjustments should be car-
ried out to ensure safe operation of the apparatus.
3.1.1. Selection of Mains Voltage
The 1618 may be powered from a 100, 115, 127, 200, 220 or 240 V (50 to 400 Hz)
AC mains supply. To select the correct mains voltage setting, use a small coin or wide
blade screwdriver to turn the LINE VOLTAGE selector on the rear panel so that the ap-
propriate voltage indication on the selector faces the arrow marked on the panel.
3.1.2. Mains Fuse Check and Replacement
The mains fuse is contained in the fuse holder just beneath the LINE VOLTAGE selector.
To release the fuse use a screwdriver to turn the centre of the holder. For operation
from 100 to 1 27 V mains supplies the fuse should be an 400 mA slow blow (B & K No.
NF 0039), whilst for 200 to 240V supplies it should be a 200 mA slow blow (B & K No,
VF 001 2). Make sure that only fuses with the required rated current and of the specified
type are used for replacement. The use of mended fuses and the short-circuiting of fuse
holders shall be avoided.
3.1.3. Mains Connections
Once the mains voltage setting and fuse have been checked, the mains supply may be
connected to the LINE INPUT socket of the 1618 using the Power Cable AN 0020 pro-
vided. The LINE INPUT socket is not equipped with a chassis terminal for connection to
the protective ground contact of a mains socket outlet, as the high standard of protective
insulation of the 1 61 8 makes this unnecessary.
3.1.4. Grounding Considerations
When using the 1618 in complex measurement set-ups together with (other) mains op-
erated equipment, mains frequency pickup by ground loops may cause measurement er-
rors. To prevent this without prejudicing the operating safety of the measurement set-
up, the 1618 and other instruments with which it is used must be properly grounded.
To do this proceed as follows:
1. Connect the signal ground lines of all instruments together. This is done automati-
cally through the screens of the input and output cables.
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