3.2.4. Recharging Batteries in situ using the Battery Charger ZG 0113
For recharging nickel cadmium cells
QB
0008, a Battery Charger
ZG
0133 can be supplied. This
is shown in Fig.3.5 and is a double insulated mains operated supply which can provide up to
400
mA
at
12
V DC. To protect the Charger against current overload, a self resetting thermal
trip which operates at
80
° C is built-in.
Fig.
3.5.
Battery Charger
ZG
O
113
For operation from different supply voltages, the mains cable
of
the Charger has the following
colour coding:
Blue
Black
Brown
Neutral
100
to
130
V
(50
to
400
Hz)AC
200 to 240 V
(50
to
400
Hz)AC
Before connecting the Charger to the mains, the particular Brown
or
Black mains lead not used
should be clipped short and covered with insulating tape.
To commence charging, connect the
EXT.
POWER SUPPLY socket on the rear panel with the 7
pin
DIN
plug
of
the Charger. The cells will start to recharge immediately the mains supply is
connected. For totally discharged cells the recharge time is approximately
19
hours, however
the cells may be left on charge for
an
indefinite period without danger
of
overcharging. At the
end
of
the charge period, disconnect the Charger from the
2512
and carry out the Battery
Check procedure described in section 3.2.1. If the cells fail to give a suitable battery check
indication then they should be replaced.
Note: The Battery Charger
ZG
0113 cannot be used
for
recharging nickel cadmium cells whilst
the
2512
is
being
used
for
measurements.
However,
provided
the
cells
are
not
completely
discharged, then it may be used to power the 2512 whilst preventing further discharge from the
cells.
3.2.5. Using an External DC Supply
For connection of
an
external battery
or
other external
DC
source, the
EXT.
POWER SUPPLY
socket
of
the 2512 has the pin identities shown in Fig.3.2. Do not connect a +
12
V charge
source, if alkaline
or
standard
dry
cells are fitted. With nickel cadmium cells
QB
0008, the
recharge time is approximately
19
hours. There is no danger
of
overcharging by leaving the
cells on charge
for
a longer period.
For simultaneous operation and recharging using a single external DC source, the EXT.
POWER SUPPLY socket may be connected with a
12
V car battery, as shown in Fig.3.7. If a
car's own
12
V battery is used
for
this purpose, then the ignition system may be left running
whilst recharging is carried out, but not when operating the 2512. Also care should be taken
to
ensure that the cabinet
of
2512 and
of
other instruments with which it is used are not touching
21
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