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OPERATING POWER INFORMATION
OPERATING
CONSIDERATIONS
CAUTION
Due to the capacitive line input circuit , sudden voltage
changes
may
cause
damaging
input
input
current
transients . Avoid operating
this instrument from
square-wave inverter supplies , or other sources that
produce large voltage transients.
INTERNAL BATTERY OPERATION
The 214 is designed primarily for operation from the
internal rechargeable batteries . The operating time provided
from the internal batteries depends upon trace intensity,
STORE or NONSTORE mode , and battery charge and
discharge temperature . Typical operating time from fully
charged batteries
at maximum trace intensity in the
NONSTORE
mode
of operation ,
when
charged
and
operated at +20 ° C to + 30 ° C ( + 68 ° F to + 86° F) , is four
hours . When operated
in
the
STORE
mode ,
typical
operating time is three hours . Longest operating time
occurs at lower trace intensity.
The POWER (BATTERY) LED provides an indication of
the operating power of the 214. When the light extinguishes ,
battery charge is low and about five minutes of instrument
operating power remains . The 214 has an automatic battery
protection circuit to prevent excessive discharge and the
resulting battery damage if the battery charge level drops
below approximately 10 volts.
BATTERY CHARGING
REV JAN 1985
The charging characteristics of the nickel-cadmium
(NiCd) cells used in the 214 vary with the temperature at
which they are charged . Batteries charged at about +20° C
to + 30° C ( + 68 ° F to + 86 ° F) deliver more energy than
when the same batteries are charged at a higher or lower
temperature.
7
214 OPERATORS
SN B300000 & ABOVE
To charge the batteries , connect the instrument to an AC
line and set the POWER switch to the OFF position . Allow
at least eight hours for the batteries to reach full charge . For
longest operating life of the batteries , increase the charge
time to at least 16 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
reversed charged .
AC OPERATION
The nickel-cadmium cells will self-discharge when the
instrument is non- operational for extended periods of time.
The rate at which this self- discharge occurs is dependent on
the ambient temperature and humidity . If the 214 is to be
stored for extended periods , particularly at either high
ambient termperature or high humidity , it is recommended
that the batteries be run through a full charge cycle ( eight
hours) about every two weeks.
If the internal batteries of the 214 become discharged to
the minimum operating level , continued operation can be
obtained by connecting the instrument to an AC power
source. Due to the circuitry connected with the internal
battery charger, the AC power line voltage must be at least
110 volts for operation in this manner . Also, when operated
with fully-charged batteries from the AC line below about
110 volts and in the STORE mode of operation , the internal
batteries will discharge slowly . The internal batteries cannot
be recharged while the instrument is being operated from
the AC line .
INTENSITY CONTROL
The INTENSITY control determines the brightness of the
display presented on the CRT . Since the brightness of the
CRT display affects the amount of current drained from the
batteries , the INTENSITY control should be set to the
minimum usable level . This will allow maximum operating
time from the internal batteries.
The setting of the INTENSITY control will affect the focus
of the display in the STORAGE mode of operation . Turn the
5
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