Operating Instructions
3
Trees
Trees do not provide a suitable shadow and in fact you should not locate
your chronograph in the shadow of a tree as it is likely to cause more
problems than it could ever solve.
Sunrise and Sunset
The lighting conditions at sunrise and sunset can cause errors due to
reections because of the extremely low angle of the sun, or the low light
levels encountered.
Electrical Interference
It is unlikely but possible that use of the chronograph in close proximity to
a radio tower, microwave tower, or large power facility could cause errors
and functional problems. Avoid use in these areas if you encounter these
problems.
Using the Chronograph Indoors
Common problems that occur indoors include the following:
▪ Not Enough Light
Indoor lighting is often not suitable for use with the chronograph. Most
bare incandescent lamps are not a good light source because they
provide an uneven amount of light over the sensing area. A white
background with even amounts of light over the sensing area works
best.
▪ Wrong Kind of Light
Florescent lamps are not at all suitable, because although we cannot
see it with our naked eye, they actually vary in intensity many times a
second and the ProChrono Digital can detect this, which renders it
useless as long as it’s sensors fall under the inuence of it.
If you would like to use your chronograph in an area where improper lighting
conditions exist, Competition Electronics offers a specially designed indoor
lighting system. More information on this is found in the “accessories”
section of this manual.
Lighting and Accuracy
Adverse lighting conditions can cause accuracy issues, and having read the
above, you should be able to understand why. Any change in light intensity
that a sensor detects other than the actual passing over the sensor of the
leading edge of the projectile will give errors.