Operating Instructions
1
Congratulations!
You have purchased a ne quality shooting chronograph.
This chronograph is designed and manufactured in the USA. It’s quality and
accuracy are built in. With proper use and care, it will give you many years
of pleasant, trouble free service.
How It Works
The ProChrono Digital chronograph operates on the principle of measuring
the time it takes for an object to travel from the rst projectile sensor to
the second projectile sensor. The sensors, mounted internally in the case,
gather light through the two rectangular openings in the top of the case.
The sensors are actually specially designed electromechanical devices that
can detect changes in light intensity that occur when a projectile interrupts
light rays shining into a sensor when it passes over the opening above.
If you can imagine looking up at the sky through a tube, you will gain an
understanding of what the sensors see. The only light they see is what is
directly above them. Any light blockage caused by an object passing over
them is converted to a signal that is detected by the ProChrono Digital. The
chronograph measures the elapsed time between the light interruptions a
projectile makes as it travels over the front, and then the rear sensor. It then
converts this time into velocity and displays it on it’s front-mounted LCD
screen so that you can read it.
Before You Start, (Or if You Encounter Problems)
Consider The Following
Lighting Conditions
As mentioned above, the ProChrono Digital chronograph is a light-sensing
device. In the course of use, the chronograph must cope with a multitude
of different lighting conditions…sunny clear skies, overcast days, low
light situations, reections, different colors and shapes of projectiles, etc.
Although the ProChrono Digital works awlessly over a very wide range of
lighting conditions, there are times when the lighting environment can affect
chronograph performance.
Diffuser Use
It may be counterintuitive, but the best natural conditions for using the
ProChrono Digital chronograph do not occur on a clear, sunny day, but
rather on overcast, cloudy days. This is because the ProChrono Digital
needs a diffused light source to work properly.