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PROCHRONO LTD
U S E R M A N UA L / O P E R AT I N G I N S T R U C T I O N S
NOTE:
Most of the 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. 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 necessary.
Delete Shot
While positioned on a velocity, it can be deleted by pressing the “Delete Shot”
button. When you do this, the ProChrono LTD 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
Because the ProChrono LTD momentarily displays the string and shot information
before listing the associated velocity, you may want to view this information again.
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 the string again.
