Competition Electronics ProChronoLTD CEI-3825 Manuale utente

Please read this manual!

This manual contains

setup information

necessary to achieve

proper performance

from your chronograph.

OPERATING INSTRUCTIONS

Look inside

for accessories to use

with your ProChrono LTD!

PROCHRONO LTD

USER MANUAL / OPERATING INSTRUCTIONS

TABLE OF CONTENTS

How It Works / Lighting Considerations .............................. 3

Common Conditions that May Cause Problems ......................4-5

Using the ProChrono LTD with Dierent Projectile Types .............6-7

Battery Installation ................................................. 7

Mounting the Chronograph ......................................... 7

Installing the Guide Wires & Difuser Hoods ........................... 8

Operating the Chronograph......................................... 8

Meters per Second/Feet per Second Selection ........................ 8

Getting Started: Recording Projectile Velocities ...................... 9

Duplicate Velocities ................................................. 9

Low Battery Indication .............................................. 9

Error Indication ..................................................... 9

Working with Projectile Velocities & Statistics ....................... 10

Pushbutton Controls ............................................10-11

Specications ..................................................... 12

Limited Warranty .................................................. 13

Accessories ........................................................ 14

Thank you for purchasing our product! It is important to

read and understand this manual before trying to use your

new chronograph.

We are here to help. If you have any questions or comments, please contact us

at 815-874-8001 or www.competitionelectronics.com. The ProChrono LTD is

designed and built in the USA, and with proper use and care it will give you many

years of trouble free service.

PROCHRONO LTD

USER MANUAL / OPERATING INSTRUCTIONS

How It Works

The ProChrono LTD 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, monitor light through the two rectangular

openings in the top of the case. These sensors are specially designed electrome-

chanical devices that can detect the small changes in light intensity that occur

when a projectile interrupts light rays shining into the sensor opening.

If you can imagine looking up at the sky through a tube, you will gain an under-

standing of what the sensors see. The only light they see is what is directly above

them. Any change in light caused by an object passing over them is converted to a

signal that is detected by the chronograph circuitry. It then measures the elapsed

time between the light interruptions, converts this time into velocity, and displays

it on its LCD screen.

Lighting Considerations

Lighting Conditions

As mentioned above, the ProChrono LTD is a light sensing device. In the course

of use it must cope with a multitude of dierent lighting conditions… sunny

clear skies, overcast days, low light situations, reections, dierent colors and

shapes of projectiles, etc. Although the ProChrono LTD works awlessly over a

very wide range of conditions, there are times when the environment can aect

chronograph performance.

Diuser Use

It may be counterintuitive, but the best natural conditions for using the ProChrono

LTD are overcast, or cloudy days. This is because the ProChrono LTD works best

with a diused light source.

For this reason, white plastic diuser hoods are provided with the unit for use

on clear, sunny days. This will insure that the light that the chronograph sensors

see from above is homogenous and scattered and will greatly reduce errors in

velocities and missed detection.

On an overcast day, it is generally better to remove the diusers. This is because

the clouds act as diusers, so no further diusion is needed and is advantageous

to allow more light into the chronograph.

PROCHRONO LTD

USER MANUAL / OPERATING INSTRUCTIONS

Some Common Conditions that May

Cause Problems

You can encounter a wide variety of lighting conditions if you use your

chronograph outside. The following are some things to look out for:

Reections

On sunny days, reective projectiles may cause “glints” which can induce velocity

errors. This phenomenon is minimized by using the diuser hoods. However,

depending on the position of the sun, further setup adjustments may be

necessary. If false readings occur with the diuser hoods in place, you can correct

the problem with one or more of the following steps:

• Change the position of the chronograph relative to the angle of the sun

• Color the bullet tip with a black, permanent marker

• Move the chronograph to a location in the eld of a shadow cast by a building

or an opaque wall. Make sure the sensors have a clear view of the sky but the

chronograph itself is within the shadow. An alternate method for this is to

use shields taped on the sides of the guide rods to create the shadow. Be sure

to use cardboard or something similar that will not cause any problems with

ricochets. This will eliminate reections from direct sunlight, while still assuring

that the chronograph has a direct view of the sky. In some cases, doing this

may reduce the incoming light level too much and make the chronograph less

sensitive

Trees

You should not locate your chronograph in the shadow of a tree since the

movement of leaves and branches can cause instability in the lighting

environment.

Sunrise and Sunset

The lighting conditions at sunrise and sunset can cause errors due to reections

(glints), skewed shadows, or low light levels because of the extremely low angle of

the sun.

PROCHRONO LTD

USER MANUAL / OPERATING INSTRUCTIONS

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

common incandescent lamps positioned directly above the chronograph 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, (such as an incandescent ood lamp shining up onto a

white surface above the chronograph)

Wrong Kind of Light

Florescent lamps will not work as a light source for your chronograph, because

although we cannot see it with our naked eye, they are pulsing many times per

second and the chronograph can detect this which renders it useless because

the cycle rate is similar to the speed of projectiles.

If you would like to use your chronograph in an area where improper lighting

conditions exist, Competition Electronics oers a specially designed indoor

lighting system. More information on this is found in the“accessories”section of

this manual.

Lighting & Accuracy

Adverse lighting conditions can cause accuracy issues, and having read the above

you can understand why. Any change in light intensity that a sensor detects other

than the shadow of the intended projectile will result in errors.

(Some Common Conditions that May Cause Problems continued...)

PROCHRONO LTD

USER MANUAL / OPERATING INSTRUCTIONS

Using the ProChrono LTD with Dierent

Projectile Types

Pistols & Riﬂes

The main consideration here is probably muzzle blast. Make sure you stand back

far enough from the chronograph to avoid the muzzle blast triggering the sensors

and introducing velocity errors.

• For pistols, the muzzle to chronograph distance should be 5 to 10 feet.

• For ries, we recommend a muzzle to chronograph distance of 10 to 15 feet.

If muzzle blast is aecting your readings, move back to resolve the problem.

If you are using a scope, be sure to check the boreline-to-scope distance and raise

your aimpoint to accommodate this measurement, otherwise the projectile may

hit the chronograph.

Shotguns

To chronograph shotgun loads, do not install the guide wires and diuser hoods

under any type of lighting conditions or they may be hit by the shot mass. Due to

the size and shape of a shot mass, diused light is not necessary.

Start by standing at a distance of 5 feet from the muzzle of the gun to the

chronograph and aim about 6 inches above the unit.

You may have to experiment with shot placement and muzzle distance to nd the

right spot to measure your particular load. If you stand too far away, the shot can

spread out too far causing inaccurate velocity readings, and the wad can separate

from the shot column and may hit and possibly damage the chronograph.

See the CEI Debris Shield in the accessories section of this manual, it can provide

an additional measure of protection.

Bow and Arrow & Crossbow

Make sure that you stand a little more than one arrow’s length away from the

chronograph when shooting to assure that the arrow is not accelerating when it

reaches the chronograph, otherwise your velocity readings may be inconsistent.

Regarding the arrow tips, we recommend using dark colored eld points for best

results.

PROCHRONO LTD

USER MANUAL / OPERATING INSTRUCTIONS

Paintball Guns

Muzzle to chronograph distance is not a factor with paintball guns, however

paint buildup on the unit may aect its performance. See the CEI Debris Shield

in the accessories section of this manual, it can provide an additional measure of

protection.

Airguns, BB Guns, Pellet Guns & AirSoft Guns

Muzzle to chronograph distance is not a factor with these types of guns. The main

issue is that BB’s are probably one of the most dicult projectiles to measure

using light-based techniques because they are small and shiny. However, with

proper setup and lighting conditions the ProChrono LTD will measure them

reliably.

Miscellaneous

You may think of other uses for the chronograph. For example, some have used it

to measure the speed of sporting clays. If you can get it to pass over the sensors,

you can probably measure the velocity.

Battery Installation

Begin by installing a new 9 volt alkaline battery in the chronograph battery

compartment. There is also space to store a spare. You can expect at least 20 hours

of operation from a new alkaline battery.

Mounting the Chronograph

The chronograph may be placed on a sturdy table or mounted to a tripod

using it’s molded-in 1/4-20 threaded insert. Be careful to prepare adequately

for windy conditions, especially if you are using a tripod. The diusers make the

chronograph susceptible to wind gusts.

(Using the ProChrono LTD with Dierent Projectile Types continued...)

PROCHRONO LTD

USER MANUAL / OPERATING INSTRUCTIONS

Installing the Guide Wires & Diuser

Hoods

(Note: Diuser Hoods are intended for sunny conditions only)

Insert the 3/16” rods into the holes on each side of the plastic diuser. Insert one

of the rods into the chronograph. Insert the other rod into the opposite side of the

chronograph.

Operating the Chronograph

To turn the chronograph on, move the small black slide switch on the side of the

chronograph to the “ON”position. The display will briey show all segments.

Meters per Second/Feet per Second

Selection

If you want to use the chronograph in ft/sec mode, just turn it on. To register

velocities in meters/sec mode, hold down the “review” button while you turn on

the chronograph until you see the “rdY” message.

You must do this each time you turn on the chrono when meters/sec readout

is desired.

Projectile

Sensors

Delete String

Button

Display Readout

Review Button

String Change

Button

Redisplay

Button

On/Off Switch

Delete Shot

Button

Battery Compartment

Tripod Mount

Insert 1/4-20 Thread

Delete

Shot

Delete

String

Review

Redisplay String

Change

PROCHRONO LTD

USER MANUAL / OPERATING INSTRUCTIONS

Getting Started: Recording Projectile

Velocities

Getting a velocity is as simple as turning on the chronograph and shooting over it.

You must shoot along the long dimension of the chronograph within the triangle

formed by the rods and the diuser screens (even if they are not installed), being

careful not to hit any parts of the chronograph. On detection of the projectile, the

display will briey show the current shot string and updated number of shots in

the string, followed by the velocity recorded.

Duplicate Velocities

If the chronograph should record 2 shots of

the same velocity one after the other, the“duP”

(duplicate) message will appear (Fig. 1), followed

by a single digit number representing the duplicate

velocity. If subsequent shot velocities are also the

same, the number will increment. If 10 sequential

duplicate shot velocities are recorded, the number

will be reset to 1.

Low Battery Indication

If the battery voltage becomes low (6.8-7.0 volts),

the chronograph will ash the message“bAt” at

intervals to signal that it is time to change the

battery (Fig. 2). If the battery voltage drops below

6.8 volts, the chronograph will ash the message

“CbAt” to let you know it is time to change the

battery, and the unit will no longer register velocities.

Error Indication

In the event a signal is recorded by the rst sensor,

but no signal is recorded by the second sensor, an

error “Err” message will ash momentarily (Fig 3). You

should try adjusting your aim position if this occurs.

PROCHRONO LTD

USER MANUAL / OPERATING INSTRUCTIONS

Working with Projectile Velocities & Statistics

The ProChrono LTD allows you to observe and work with your velocity data. This is

done through the use of the front panel pushbutton controls described below.

String and Shot Navigation

Each time the ProChrono LTD successfully detects a shot, it’s velocity is stored at

the end of the currently selected string.

The ProChrono LTD can store up to 9 strings of 99 velocities each and retain them

in non-volatile memory even if you turn the chronograph o and remove the

battery. You can shoot now and the chronograph will store your velocities for later

review.

Pushbutton Controls

String Change

When the ProChrono LTD is rst turned on, it automatically positions itself at the

end of shot string 1 and displays the most recent shot velocity. By pressing the

“String Change”button, the user can sequentially select each one of the 9 string

memories into which the unit will place the shot velocities as they are detected.

When shot string 9 is selected, pressing the“String Change” button will increment

back to string 1.

Review Shots and Statistics for a String

The “Review” button will cause the ProChrono LTD to display the previously red

shot velocity within the current string. Upon each subsequent press of this button,

the previous shot velocity will be displayed until the user reaches the rst shot in

the string. At this point, pressing the “Review” button again causes the display to

begin showing the statistics. The display will cycle through High Velocity, Low

Velocity, Average Velocity, Extreme Spread, and Standard Deviation. Finally,

pressing it again will reposition the display to show the last recorded shot velocity

in the string.

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