AC Resistance Indications
Transmitter Rechargeable Battery Option
If the 8879 T
RANSMITTER
has a rechargeable battery, the battery cover will extend past the main T
RANSMITTER
housing shell by approximately half an inch. The CHARGER PLUG is located near the inner wall of the car-
rying handle on the T
RANSMITTER
housing. The rechargeable battery is a 12V 7 amp/hr sealed lead acid bat-
tery. The battery may be replaced by removing the back cover and the four nuts on each side of the bat-
tery bracket. Once the bracket is removed, the two red/black wires can be disconnected from the battery
terminals by pulling the forth-of-an-inch spade connector off.
An automatic shut down circuit protects the lead acid battery from excessive discharge. This circuit trips an
internal shutoff system that activates when the battery voltage discharges down to 8.2V. The auto shutoff
circuit can be reset by turning the power switch off. The LOW BAT icon located on the LED display turns
on when the battery discharges down to 10.5V. The time between a LOW BAT indication and an auto shut-
off, will vary from 30 minutes to 15 minutes depending on the charge level of the battery and when the LOW
BAT condition occurs. Also when the LOW BAT icon is activated, the output will cycle every 20 seconds on
the R
ECEIVER
to inform the user a LOW BAT condition is present.
Note: Do not reset the TX after the auto shutoff has switched the TX off. Doing so will drain the bat-
tery to the point where it will not accept a charge.
*Load Values for Direct Connection
Note: When the load indicator does not blink in the 815 Hz mode, this indicates the
R
ED
/B
LACK
C
ORD
needs to be plugged in.
NUMBER OF BLINKS
IMPEDANCE
Ω
4 blinks per second
5
Ω
-15
Ω
circuit
15
Ω
-100
Ω
circuit
100
Ω
- 400
Ω
circuit
400
Ω
- 1800
Ω
circuit
1800
Ω
- open circuit
1 blink per second
1 blink every 2 seconds
1 blink every 3 seconds
2 blinks per second
Recharging the Battery
AC Charger
A discharged battery can be fully charged in 24 hours or less with the use of the AC C
HARGER
. A partially
discharged battery should be charged for a shorter time. When charging the battery with the AC C
HARGER
,
the T
RANSMITTER
power switch must be in the OFF position. Do not attempt to power the T
RANSMITTER
with
the AC C
HARGER
. Possible damage could result to the charger if the switch is on when attempting to charge
the battery with the AC C
HARGER
.
External Power Pack
Automotive Charge
A discharged battery can be fully charged in 5 hours or less when using the A
UTOMOTIVE
C
HARGER
. Typically
every 10 minutes of charge time will give about 20 minutes of battery usage. When charging the battery
with the A
UTOMOTIVE
C
HARGER
, the T
RANSMITTER
switch must be in the OFF position. It is possible to power
the T
RANSMITTER
from the A
UTOMOTIVE
C
HARGER
, however, when the T
RANSMITTER
is turned on and the
charger plugged in, the battery can not be charged simultaneously.
4
Sealed lead acid batteries should be disposed of in accordance with your
companies policies, and/or city, state, or federal regulations and guidelines.
