20
Recharging nickel-cadmium rechargeable cells
The rechargeable nickel-cadmium cells available as optional accessories can be recharged
while still in the battery compartment
of
the 2512 using the Power Supply ZG 0199 via the EXT.
POWER SUPPLY socket on the rear panel
of
the 2512. They may also be charged externally in
the Battery Box
ZG
0146 using the Charging Adaptor AQ 0157 and the ZG 0199.
In situ
Connect the OUTPUT socket
of
the
ZG
0199
to
the EXT. POWER SUPPLY socket
of
the 2512
using the cable AQ 0035 as shown in Fig.3.3. and set the OUTPUT SELECTOR switch on the
ZG
0199 to one
of
the "Charge -
On"
positions. Recharging time
for
fully discharged cells is
19
hours, and they cannot be overcharged if they are left on charge indefinitely. The ZG 0199
supplies sufficient current to power the 2512 and charge the batteries at the full rate while the
instrument is in use.
Charging
Adaptor
AO 0157
Retaining Pin
Fig.
3.4.
The
AQ
0157
about
to be fitted to the
battery
box
Using
the
Battery
Box
ZG
0146
7
Power
input
plug
of
Charging
Adaptor
770546
It is often convenient
to
have a spare set
of
rechargeable cells on charge outside the
instrument. These cannot be charged using the method above. Instead, a Charging Adaptor
AQ 0157, as shown in Fig.3.4., must be used. The Charging Adaptor is placed on the battery
box
at
the opposite end from its lid. Its two locating arms are slid down the grooves at the top
and bottom
of
the Battery Box ZG 0146, and the Charging Adaptor is held in position by a
spring-loaded retaining pin in each
of
the arms. A further locating pin, which fits into the end
of
the Battery Box ensures that the Charging Adaptor is fitted the correct way up to ensure the
correct polarity. The power supply contacts are also spring loaded, and this holds the retaining
pins in position. A seven-pin
DIN
plug from the Charging Adaptor connects directly to the
Power Supply ZG 0199, which should be set
to
"Charge".
Note:
Do
not attempt
to
charge dry cells.
When charging is completed, the Charging Adaptor is released by pressing it towards the
Battery Box thus disengaging the spring-loaded retaining pins. The Charging Adaptor may
then simply be slid off the Battery Box.
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