ProChrono Digital Operating Instructions Part # CEI-3800 Look inside for accessories to use with your chronograph!
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 It 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.
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.
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.
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.
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.
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.
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.
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. ▪ 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.
CEI 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.
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 # CEI-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 chronograph from damage.
Digital Remote Control Part # CEI-4000 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.
SPECIFICATIONS Velocity Range: Temperature Range: Size: Weight: Battery Required: Mounting Hole Thread: Guide Wire Size: Memory Capacity: Minimum Time Between Shots: Shot Timing Resolution: 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.
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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.
