4
RaceAmerica Model 3850 Timer AC4
THEORY OF OPERATION
The Model 3850 Timer AC4 is a completely
self contained race timing system made with the
latest technology CMOS circuit components
to provide a highly accurate autocross timing
solution. The system contains an internal quartz
crystal clock to maintain time accuracy and display
of race results to one thousandth of a second.
The AC4 can operate with a single sensor (lap
timer) or with dual location Start/Finish sensors.
The system can receive data from either wireless
track sensors (T-Links), hard-wired track sensors
or manually from the console keypad. Desired
settings are selected in a configuration menu and
retained until changed at a later time.
T-Link2 Wireless replaces track cables normally
used to connect track sensors to the timing system.
Model 5810 T-Link2 connects to an external track
sensor using a short interconnect track cable.
NOTE: THIS PRODUCT OPERATES ON
HIGH FREQUENCY RADIO WAVES. DO
NOT POWER ON THE T-LINK2 WITHOUT
ATTACHNG THE ANTENNA AND DO NOT
OPERATE UNITS CLOSER TOGETHER
THAN FOUR FEET. ADDITIONALLY, DO
NOT PLUG ANY DEVICE IN THE CHAR-
GER PLUG BUT THE CHARGER. PLUG
ONLY DESIGNATED RACEAMERICA
CABLES IN THE T-PORT CONNECTOR.
Power is supplied to the timer console and
track sensor components of the 3850 Timer AC4
by the 12VDC automotive battery connected to
the RED and BLACK alligator clips or regulated
DC power source. Under normal conditions, a
properly charged battery will operate for an entire
day of racing without requiring a recharge.
The Beam Emitters and Track Sensors
operate on invisible (to the unaided human eye)
Infra Red (IR) light. The coded light frequencies
are constantly received (aligned) by the Track
Sensors until a car interrupts reception (‘breaks’
the beam).
Model 5040/5050 - IR Beam Emitter
Note On/Off switch and placement for four AA
batteries for each Beam Emitter. All Beam Emitters
are fully interchangeable with one another. Picture
shows top and bottom of units.
Model 5140 - IR Track Sensor
Note cable connector is located in the side
facing away from the track. Track Sensors are
interchangeable with one another. Track Sensor
is pictured with both top and bottom sides up.
The IR Beam Emitter to Track Sensor
transmission operates on Line-of-Sight principles.
This makes alignment of these units critical but
simple. Tips are provided to aid alignment on
surfaces that are other than ideal. These units
will operate over a wide range of conditions but
should not be operated beyond the specification
parameters (less than 4 ft or more than 50 ft).
Each T-Link2 unit is configured with a unique
ID code and a wireless optimizer code. These
codes are listed on the identity label located on
the bottom of the T-Link2 unit. Valid T-Link2 ID
codes are Z, A, B. The wireless optimizer code
is also listed on the identity label for wireless
communications optimization and compatibility
with other T-Link2 units. T-LinkOne and T-Link2
can operate on the same optimizer code.
