Chapter 5. Troubleshooting
STACK ST8302 and ST8360 Video-Logger System
66
User Guide
Symptom
Possible Cause
Remedy
Notes
Incorrect wiring
Reconnect as
specified in this
manual
Check condition of
points, condenser,
& points spring.
Coil & point systems
only.
Displayed RPM
value erratic, value
jumps high or low
Signal from ignition
system or coil is
noisy
Condition the ES
signal by placing a
resistor in line with
the ES wire
Resistor values:
10K ohms for
dedicated tacho
output; 47K Ohms
for coil connection
(Non-CDI); 100K
Ohms for coil
connection (CDI).
Resistors 1/2W 5%
350v
System configured
with wrong number
of targets per wheel
revolution
Reconfigure the
system with correct
number of targets
Displayed speed
value too high or
too low by a
constant %-age
amount
System configured
with wrong
circumference
Reconfigure the
system with correct
circumference
Typical wheel
circumference for a
vehicle is 1800mm /
70” or 900mm / 35”
for a kart
Faulty sensor and/or
wiring
Check sensor
indicator for correct
operation
Incorrect sensor gap
(too far or too close)
Check that the gap
is approximately
1mm
No Speed reading,
Speed reading
erratic, value
jumps high or low
Sensor and targets
moving apart
Fabricate a more
rigid sensor bracket
Rotate the wheel by
hand and check that
the sensor indicator
lights up as each
target passes the
sensor
