Effect Of Low Temperature On Battery Capacity; Life Characteristics In Standby Use - Mid-Continent Instruments 4300 Series Installation Manual And Operating Instructions

C. Standby Battery Test
The control panel on the front of the instrument incorporates a manual test feature.
This test feature places the standby battery pack under load for approximately one
minute (the gyro is used as a load) while displaying either a red or green light under
the word TEST on the front panel.
To initiate this test:
1. Turn on the indicator with aircraft power and allow the unit to spin up for 3
minutes or more
2. Press and hold the STBY PWR button. After several seconds the amber LED
will start flashing, indicating unit has latched into Battery Test Mode. The
test runs for approximately one minute, during which time the amber LED
flashes continuously and either a red or green light is displayed under the
word TEST.
3. Visually monitor the test lights until the amber LED stops flashing, signaling
the end of the test.
4. A green light throughout the test indicates the standby battery pack is
healthy and should be able to function normally. A red light at any time
during the test means that the standby battery is at least in need of
charging, and possibly of replacement.
Complete charging may be required to bring the battery up to full charge if it has
been stored for more than four months or if it has been partially discharged. I f a
steady red light is observed at any time during the test, charge the standby battery
completely, using one of the methods described in section 2.6 and retest the battery.
I f after charging, the test still fails, service may be required.
I t is not recommended to test the battery when aircraft power is not available, but it
is possible to put the indicator into test mode while operating on the backup battery.
The test will run, but the indicator will turn off at the end of the test period. To turn
the indicator back on, simply push the STBY PWR button again.
Rev J, September 1, 2009
Mid-Continent I nstruments, Wichita, KS
A green light throughout this short test does not guarantee that
a full hour of operation time is available. Actual operation time
on the battery may vary considerably depending on
temperature, charge status, and battery condition. (See Sect.
3.6 for more details).
Fig. 2.5: Nominal Battery Discharge Rate at 20° C
Manual Number 9015762
Note:
Page 21 of 22