22
Chassis
+ 12V
DC
Battery
Charge---t1--t---1-
l nput
ov
Supply Ground
810234
Fig.
3.6.
External view
of
the
EXT.
POWER SUPPLY
socket
of
the 2512
the metal bodywork
of
the car. This is particularly important with cars having a positive earth
system, as when the battery is connected, the chassis of the instruments will be at a potential
12
V lower than that
of
the car chassis and could short circuit the battery if allowed to touch the
car bodywork.
In
this case the fuse will blow to protect the instrument.
+
12 V
Car
Battery
2512
Ext. Power Supply
+ 12V
DC
Charge Input
ov
JP
0703
+ 6V
to
+ 15V
DC
Power Input
810235
Fig.
3.7.
Connection
of
a
12
V
car
battery
for
simultaneous operation
and
recharging with the 2512
Fuse
Fig.
3.8.
Position
of
the fuse. Access is via the top panel
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