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1. Standard Deviation Sd Consider an example to illustrate the meaning of standard deviation If for example you have a standard deviation of 10 fps with an average velocity of 1000 68 of the shots you fire will fall within 990 to 1010 fps If you double the 10 fps standard deviation to 20 fps 95 4 of the velocities will fall within 980 to 1020 fps The more shots you fire the more accurate the standard deviation A minimum of 5 shots is needed and more would be desirable TIP To quickly switch from shot velocities to statistics with large shot strings and vice versa hold down the Review button After a short time the unit will switch directly from velocities to the first statistic or statistics to the most recent shot velocity Delete Shot While positioned on a velocity this current velocity can be deleted by pressing the Delete Shot button When you press this button the ProChrono Digital will delete the currently displayed velocity renumber all the shot velocities above it in the string and reposition the display to the last velocity It will redisplay the velocity number which has been decreased by 1 due to the deletion just performed Statistics will be recalculated minus the deleted shot s This operation is not reversible Delete String If desired you may delete all the velocities in the current shot string at once by pressing the Delete String button This operation is not reversible Redisplay With2. a sales slip or other written proof of date of purchase TO THE EXTENT PERMITTED BY LAW ANY AND ALL IMPLIED WARRANTIES INCLUDING MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE ARE EXCLUDED ANY IMPLIED WARRANTIES NOT EXCLUDED ARE LIMITED IN DURATION TO 2 YEARS FROM DATE OF PURCHASE INCIDENTAL AND CONSEQUENTIAL DAMAGES ARE EXPRESSLY EXCLUDED FROM THE REMEDIES AVAILABLE TO THE PURCHASER AND THE REMEDIES PROVIDED IN THIS WARRANTY SHALL BE EXCLUSIVE TO THE EXTENT PERMITTED BY LAW Note Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or consequential damages so the foregoing limitations and exclusions may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from state to state If any product returned by the purchaser is found by COMPETITION ELECTRONICS INC to require service not covered by warranty COMPETITION ELECTRONICS INC will so advise the purchaser and request further instructions COMPETITION ELECTRONICS INC will recondition to working order any ProChrono Digital returned to it regardless of condition upon the purchaser s remittance of payment of 1 2 of current retail price plus shipping if it is still manufactured by COMPETITION ELECTRONICS INC Contacting Competition Electronics Competition Electronics Inc 3469 Precision Dr Rockford IL 61109 Ph 815 874 8001 Fax 815 874 8181 On
3. the scope that much higher than the middle of the shooting area Shotguns To chronograph shotgun loads stand back at a distance of 5 feet from the chronograph to the muzzle of the gun If you stand too far away the shot will soread out too far causing inaccurate velocity readings Also the wad will separate from the shot column and may hit and possibly damage the chronograph When using sabots or gas checks there is a chance they may depart from the projectile path and hit the chronograph This usually damages the display Bow and Arrow and 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 still accelerating when it reaches the chronograph otherwise your velocity readings may be inconsistent Be aware of shiny arrows and shafts etc if you encounter problems Paintball Guns Distance to the muzzle is not a factor with paintball guns however paint buildup on the unit may affect it s 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 and AirSoft Guns Distance to the muzzle is not a factor with these types of guns The main issue here is that BB s are probably one of the most difficult projectiles to measure using light based techniques because they are round and shiny However at Competition Electronics we achieve good results
4. with BB s all the time You may need to control and modify the lighting conditions though 4 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 it s speed Battery Installation Begin by installing a new 9 volt alkaline battery in the chronograph battery compartment There is also a space to store a spare You can expect at least 20 hours of operation from a fresh alkaline battery Mounting the Chronograph The chronograph may be placed on a sturdy table or mounted to a tripod using it s molded in 20 threaded insert Be careful to prepare adequately for windy conditions especially if you are using a tripod The diffusers make the chronograph susceptible to wind gusts Installing the Guide Wires and Diffuser Hoods Note Diffuser Hoods are intended for sunny conditions only Insert the 3 16 rods into the holes on each side of the plastic diffuser Insert one of the rods into the chronograph Insert the other rod into the opposite side of the chronograph Projectile Sensors Battery Compartment Delete String Delete Shot Button Display Readout Tripod Mount Insert 1 4 20 Thread Comm Port For Remote Device Connection Review Button Redisplay Button String Change Button Operating the Chronograph To turn the chronograph on move the small black
5. Competition Electronics Part CEl 3800 Congratulations You have purchased a fine 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 lt Works The ProChrono Digital chronograph operates on the principle of measuring the time it takes for an object to travel from the first 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 Consid
6. can shoot and the chronograph will record your velocities for later Pushbutton Controls String Change When the ProChrono Digital is first 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 repositions the unit to the last velocity of shot string 1 Review Shots and Statistics for a String The Review button will cause the ProChrono Digital to display the previously fired shot velocity within the current string On each press of this button the previous shot velocity will be displayed until the user reaches the first 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 NOTE Most of these statistics are self explanatory but the following two statistics may require a bit more explanation Extreme Spread ES To get the Extreme Spread the lowest velocity for the current string is subtracted from the highest velocity
7. er 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 reflections different colors and shapes of projectiles etc Although the ProChrono Digital works flawlessly 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 y You can understand what diffused light is by considering two light bulbs One light bulb has a clear glass envelope and one is frosted The clear light bulb appears to be brighter when you look at it but it is also glaring and gives off uneven light coverage and causes shadows so it is not as good for lighting use in most situations The frosted bulb appears to our eyes as a round glowing orb of homogenous light The frosted coating causes the light to disperse and scatter so that it illuminates in a more even way providing better coverage and less shadows Note This is not to say that a frosted incandescent bulb by itself is a good light source when you use
8. he sky If you are having problems with reflections from shiny bullets or arrows another remedy you can try is to take a black marker and color your projectiles with it This will greatly reduce glare and may be needed if you have to use the chronograph in less than ideal lighting conditions 2 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 reflections 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 intens
9. ity many times a second and the ProChrono Digital can detect this which renders it useless as long as it s sensors fall under the influence 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 Using the ProChrono Digital with Different Projectile Types Pistols and 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 rifles we recommend a muzzle to chronograph distance of 10 to 15 feet If muzzle blast is affecting your readings move back to resolve the problem You may also encounter velocity errors with certain types of shiny ammunition Try coloring the bullet tip with a black permanent marker to correct this type of problem If you are using a scope be sure to check the boreline to scope distance and aim the crosshairs on
10. ltage becomes low the chronograph will flash the word bAt at intervals to signal that it is time to change the battery Fig 3 If the battery voltage drops below approximately 6 volts the low battery indicator becomes inoperative Error Indication In the event a signal is recorded by the first sensor but no signal is recorded by the second sensor an error Err message will flash momentarily Fig 4 You should try adjusting your aim position if this occurs Fig 3 Fig 4 Working with Projectile Velocities and Statistics The Pro Chrono Digital chronograph allows you observe and work with your velocity data This is done through the use of the front panel pushbutton controls described below Competition Electronics offers two accessories as another option for managing the chronograph functions and data remotely More information on the Digital USB Remote and Digital Remote Control is found in the accessories section of this manual 6 String and Shot Navigation Each time the ProChrono Digital successfully detects a shot it s velocity is stored at the end of the currently selected string This causes the number of shot velocities in the string to increase by 1 The currently selected string holds a maximum of 99 shot velocities The Pro Chrono Digital can store up to 9 strings of 99 velocities each and retain them in non volatile memory even if you turn the chronograph off and remove the battery You
11. onograph from damage This item is shipped with a protective film to be removed before use Replacement Diffuser Set Part CEI 2526 in as Replacement set of four guide wires and two diffuser hoods for outdoor use on sunny days 10 Digital Remote Control Part CEl 4000 gt en a lt AR I ES This remote control unit allows the user to control all of the functions of the ProChrono Digital chronograph from up to 20 feet away It can interface with the portable thermal infrared printer below to print out all of the velocities in a string or to print the statistics or the current string When used with the printer below it also serves as a remote display by printing out each shot velocity as it is fired The remote control also allows you to interface your ProChrono Digital chronograph to a PC for collecting shot velocities and statistics data The Digital Remote requires a serial port or a USB to Serial adapter and a terminal program such as HyperTerminal System includes Digital remote control 25 foot connection cable and instructions Portable IR Thermal Printer Part CEl 1000 This printer can be used to print out shot velocities and statistics Requires remote control above Includes paper 11 SPECIFICATIONS Velocity Range Temperature Range Size Weight Battery Required Mounting Hole Thread Guide Wire Size Memory Capacity Minimum Time Between Shots Shot Timing Re
12. slide switch on the side of the chronograph to the ON position The display will briefly show all segments Meters per Second Feet per Second Selection If you want to use the chronograph in ft sec mode just turn on the chronograph normally To start the chronograph in meters sec mode hold down the review button while you turn on the chronograph It s readout will be in meters sec when you do this You must do this each time you turn on the chrono to use it in metric mode 5 Getting Started Recording Projectile Velocities Getting a velocity is a 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 diffuser 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 briefly 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 2 followed by a single digit number representing the duplicate velocity If additional shot velocities are Fig 2 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 vo
13. so many velocities and statistics available for display it is easy to forget what you are looking at The Redisplay button will briefly show you either the string and shot number or the string and statistic ID This allows you to get a second look at the data without scrolling through this string again CEl Chronograph Accessories There are a number of useful accessories available to use with your ProChrono Digital chronograph listed in the section below Digital USB Remote Computer based Remote Control System Part CEI 3810 The PCRemote system is a PC program and hardware that allows remote control of the chronograph as well as showing you velocities statistics and extended data such as Power Factor and Ft Lbs It will also produce printouts of string and statistics data and shows you color graphs of the string velocities on screen and print media It also acts as a remote display System includes Digital remote control 25 foot connection cable and instructions Indoor Lighting System Part CEI 4100 This durable and compact lighting accessory provides optimum lighting for indoor use or under low light conditions System includes two light bars 110 volt AC power adapter and instructions Debris Shield Part CEl 2519 Competition Electronics offers an optional Debris Shield which can help to protect your chronograph from flying debris and paint However we offer no guarantee that it will protect your chr
14. solution Accuracy Current Consumption 21 7 000 feet per second 32 100 degrees Fahrenheit 16x4x3 1 4 inches 2 1 lbs One 9 volt alkaline battery not included 1 4x20 3 16x16 inches up to 9 strings of up to 99 shots each Between 250mSec and 500 mSec 750 nSec Crystal Controlled 1 of measured velocity or better Approx 15mA NOTES NOTES Warranty ProChrono Digital LIMITED WARRANTY COMPETITION ELECTRONICS INC warrants the ProChrono Digital manufactured by it to be free from defects in material and workmanship for a period of 2 years from date of purchase by the original purchaser for use COMPETITION ELECTRONICS INC at it s option will repair or replace without charge or refund the purchase price of any product which fails during the warranty period by reason of a defect in material or workmanship found upon examination by COMPETITION ELECTRONICS INC to have been the cause of the failure This warranty does not cover any failures attributable to abuse mishandling failure to follow operating instructions alteration or accident To make claim under this warranty the purchaser must return the product to COMPETITION ELECTRONICS INC at the address shown below properly packed and with shipping charges prepaid All claims must be made within 30 days after the product failure and in any event within thirty 30 days after the expiration of the 2 year warranty All claims must be accompanied by
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16. your chronograph indoors It is not On bright sunny days you should always use the white plastic diffuser screens so that the light that the chronograph sensors see from above is homogenous and scattered This will greatly reduce errors in velocities and missed detection On an overcast day it is generally better to remove the diffusers This is because the clouds act as diffusers and so no further diffusion is needed rather in this case it is more advantageous to allow more light into the chronograph 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 Reflections On sunny days shiny light colored or smooth projectiles may cause reflections which can induce velocity errors Be sure to use your diffusers on sunny days However this may not be enough by itself to correct the problem You can move the chronograph to a location in the field 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 reflections from direct sunlight while still assuring that the chronograph has a direct view of t
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