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Rifles, Reloading, Optics, Equipment
Reloading
Help! Extreme spread and standard deviation loads
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<blockquote data-quote="Shootin4fun" data-source="post: 1106120" data-attributes="member: 28741"><p>These are digital devices, folks. The detected speed will not vary based on battery strength. A quartz crystal generates the clocking pulses that drive the cpu, etc. The clock is either there, or its not. On the way out, you may see ERR and other strange behaviors but not variances in velocities or miscalculated ES, SD, etc.</p><p></p><p>This is not to say a device does not vary based on other things such as temperature. </p><p></p><p>Also, consider the angle of the bullet path over the sensors. If you shoot a path that is perfectly parallel to the plane of the sensors, and one that is 20 degrees up because the chrony is tilted, the bullet travels farther via the nonparallel path, therefore taking longer to get to the 2nd sensor. The parallel path is only 12", so a small tilt can have a measurable effect! 10% diff in path length = 10% diff in calculated velocity!!</p><p></p><p>I would like to run tests between the standard chronys we're talking about vs. the MagnetoSpeed which hangs on the barrel.</p></blockquote><p></p>
[QUOTE="Shootin4fun, post: 1106120, member: 28741"] These are digital devices, folks. The detected speed will not vary based on battery strength. A quartz crystal generates the clocking pulses that drive the cpu, etc. The clock is either there, or its not. On the way out, you may see ERR and other strange behaviors but not variances in velocities or miscalculated ES, SD, etc. This is not to say a device does not vary based on other things such as temperature. Also, consider the angle of the bullet path over the sensors. If you shoot a path that is perfectly parallel to the plane of the sensors, and one that is 20 degrees up because the chrony is tilted, the bullet travels farther via the nonparallel path, therefore taking longer to get to the 2nd sensor. The parallel path is only 12", so a small tilt can have a measurable effect! 10% diff in path length = 10% diff in calculated velocity!! I would like to run tests between the standard chronys we're talking about vs. the MagnetoSpeed which hangs on the barrel. [/QUOTE]
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Reloading
Help! Extreme spread and standard deviation loads
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