OPERATING POWER INFORMATION
INTERNAL BATTERY OPERATION
This instrument features battery operation from two inter
nal rechargeable nickel-cadmium cells. The operating time
of the internal batteries depends upon display intensity,
battery charge and discharge temperature, and the function
(DMM or Oscilloscope) being used. When the batteries are
charged and operated at +20 to +30
°
C (+68 to +86
°
F), the
typical operating time of fully charged batteries at maximum
display intensity in the DMM mode of operation is 3.5 hours.
A light-emitting diode (LED), labeled PWR (BTRY), indicates
that the instrument is on and the battery charge is sufficient
for operation. When the battery charge is low, the LED ex
tinguishes. Within 4 to 10 minutes after the LED extin
guishes, an automatic battery deep discharge protection
circuit will turn the instrument off. This prevents exces
sive discharge which would result in battery damage.
BATTERY CHARGING
To charge the batteries, connect the instrument to the power
line and allow at least 16 hours for the batteries to reach full
charge. To obtain the longest operating life for the batteries,
the instrument should be turned on at least once a month
and the batteries discharged, and then recharged for 24 hours.
This procedure balances the charge on the batteries and re
duces the possibility of either cell becoming reverse charged.
The 213 can be operated while the batteries are being char
ged.
NOTE
If the instrument does not operate with ac power
applied, and the PWR (BTRY) indicator does not
light, the power line fuse may be blown. See Po
wer Line Fuse Replacement for instructions.
The energy capacity of nickel-cadmium cells varies with the
temperature at which they are charged and operated. Table
1 shows the percentage of full charge capacity at various
charging and operating temperatures.
Charging
Temperature
0
°
C
+20
°
C to +30
°
C
+40
°
C
TABLE 1
Battery Charge Capacity
Operating Temperature
-15
°
C
+20
°
C to +30
°
C
40%
60%
65%
100%
40%
65%
+55
°
C
50%
85%
55%
10
213 Operators
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Summary of Contents for 200 Series
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