BRUEL & KJAER 1623 - Fuse Replacement

insulated, it supplies 1 2 V DC at up to 400 rnA . Colour coding for the mains power cable
is as follows:
Blue - Neutral
Black - 100 to 130V AC
Brown - 200 to 240V AC
Fig. 3. 7. Battery Charger ZG 0113
The ZG 0113 is terminated with a 7-pin DIN plug which plugs into the EXT. POWER
SUPPLY socket of the 1623. Expected life for the fully charged Nickel- Cadmium battery
is about 8 hours. Alternative methods for charging the battery are mentioned under sec-
tions 3.2.3 and 3 . 2.4 .
WARNING: There is a danger of explosion if recharging is attempted on cells that have
been fitted with their polarities reversed.
Time taken for a full recharge of the Ni-Cd cells is about 14 hours. If the cells are not
fully charged after this period, replacement is indicated. A minimum of 500 recharge cy-
cles is specified for these cells but their lifetime can be extended if they are not allowed
to become fully discharged too often.
Never attempt to recharge any type of non-rechargeable cells - there is a danger of
explosion.
Whenever a charging voltage is applied to the EXT. POWER SUPPLY socket (Pin 3),
charging power is being applied to the cells in the 1623. The position of the slide switch
marked Ext. Power- Int. Battery on the rear panel, is irrelevant .
Note that the Battery Charger Unit ZG 011 3 has a current capability which is approxi-
mately equal to the current consumption of the 1 623 when operating, so that with well-
charged cells, the ZG 0113 will act as an AC Mains power adaptor. With this method of
powering / charging the 1623 the rear panel power supply slide switch should be
switched to Int. Battery.
The output of the ZG 0113 is short circuit protected by a thermal overload cut-out which
breaks the mains power supply when the primary windings reach a temperature of ap-
prox . 80°C . Power is reconnected again automatically after a period of 10 to 30 mins.
depending on the ambient temperature .
3.4. FUSE REPLACEMENT
16
The instrument is protected by a 0,63 A slow-blow fuse B & K Type VF 0032. Access to
the fuse is gained by removing the two screws securing the top panel and sliding the
panel backwards . The fuse holder is positioned in the upper right-hand corner (viewed
from the front) of the cabinet.