2.3.2 Battery Pack Power
w
I
The Model 197 may be operated from rechargeable sealed
nickel-cadmium batteries contained in the optional Model
1978 Rechargeable Battery Pack. The battery pack will
operate the Model 197 for typically five hours. (NOTE: The
Model 197 uses the most power on the amps function and also
in the
2OOQ,
2kQ or 750VAC ranges). The BAT annunciator
turns on when the charge is insufficient to maintain accurate
readings. Refer to paragraph 5.3 for installation procedures.
I
I
2.3.3 Battery Charging
After the Model 1978 is installed in the Model 197
it
can be
charged and recharged as follows:
1.
Connect the instrument to line power as described in
paragraph 2.3.1.
2.
With the power switch off, the battery charge circuitry is
automatically energized to charge the battery at the max-
imum rate. When the battery pack is first installed, or
if
it
is completely discharged, allow
it
to charge for a minimum
of
10
hours.
NOTE
For maximum battery efficiency only charge the
battery pack after
it
has become completely dis-
charged (BAT annunciator on). Do not make
measurements with BAT annunciator on as the
readings may be erroneous.
If the battery pack is not maintaining a charge
(BAT
off)
for five hours after a full
10
hour charge cycle, do the
following.
A. Disconnect the Model 197 from line power.
B.
Turn on the Model 197 and leave
it
on to completely
discharge the battery pack.
C. Connect the Model 197 to line power and charge the
battery pack for
10
hours with power off.
D.
Repeat steps A through C three more times. The bat-
tery pack should again be good for typically five hours.
3.
When the Model 197 is in use on line power, the battery
charger maintains a trickle charge on the battery pack.
NOTE
The
IEEE
options (Model 1972 and Model 1973)
do not run off of battery power.
2.4
FRONT
PANEL FAMILIARIZATION
Figure
2-1,
and the following paragraphs, provide a brief
description of the display, front panel controls and input ter-
minals.
2.4.1
Display
The Model 197 has a
5%
digit liquid crystal display (LCD).
The minus sign is displayed. The plus sign is implied by the
absence of the minus sign. The following annunciators are
displayed on the
LCD.
~
-1
197
AUTORANGING
MICROVOLT
DMM
QSENSE
200m
*
u
2-2
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