To charge the batteries, connect the instrument to an AC line
and set the POWER switch to the OFF position. Allow at least 16
hours for the batteries to reach full charge. For longest operating
life of the batteries, increase the charge time of the instrument to at
least 24 hours once a month. This procedure balances the charge
on all the cells in the battery and reduces the possibility of any
individual cell becoming reverse charged.
The nickel-cadmium cells will self-discharge when the
instrument is stored and not used for extended periods of time. The
rate at which this self-discharge occurs is dependent upon the
storage temperature and humidity. If the 212 is to be stored for
extended periods, particularly at either high ambient temperature or
high humidity, it is recommended that the batteries be run through a
full charge cycle (16 hours) about every two weeks, or that the
instrument be left connected to the AC line.
Typical Charge Capacity (reference to charge/discharge at
+20°C to +30°C):
CHARGE
TEMPERATURE
OPERATING TEMPERATURE
-15
o
C
(+5
o
F)
+20
o
C to +30
o
C
(+68
o
F to +86
o
F)
+55
o
C
(+131
o
F)
0
o
C (+32
o
F)
40%
60%
50%
+20
o
C to +30
o
C
(+68
o
F to +86
o
F)
65%
100%
85%
40
o
C (+104
o
F)
40%
65%
55%
7
212 Operators Handbook
