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The Basics, Starting Out
Chrony Chronographs...
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<blockquote data-quote="HoytemanPA" data-source="post: 72311" data-attributes="member: 286"><p>I believe that it is the shot to shot variation that is minimized by the extended screen spacing. I do not believe the timing circuitry is the cause of this type of error but rather the threshold trip point of detecting the bullet in flight. Although the spacing is fixed the detected signal may not be. A .5 inch in variation could be very real if the first light sensor detected the very front, and the second detected the middle of a 1.6 inch 30cal Matchking. Then the next shot had a slightly tarnished bullet or whatever and detected the front on both sensors. By increasing the screen spacing the variation would be lessened because the measuring surface of the bullet is less of an issue. Say 10 feet .5 inch bullet detection error vs 1 foot .5 inch bullet detection error. Which is why as you say even an Oehler will give an odd reading every now and then. Now stretch a "junk" Chrony to 10 feet and......Well I'll let you know how I make out.</p></blockquote><p></p>
[QUOTE="HoytemanPA, post: 72311, member: 286"] I believe that it is the shot to shot variation that is minimized by the extended screen spacing. I do not believe the timing circuitry is the cause of this type of error but rather the threshold trip point of detecting the bullet in flight. Although the spacing is fixed the detected signal may not be. A .5 inch in variation could be very real if the first light sensor detected the very front, and the second detected the middle of a 1.6 inch 30cal Matchking. Then the next shot had a slightly tarnished bullet or whatever and detected the front on both sensors. By increasing the screen spacing the variation would be lessened because the measuring surface of the bullet is less of an issue. Say 10 feet .5 inch bullet detection error vs 1 foot .5 inch bullet detection error. Which is why as you say even an Oehler will give an odd reading every now and then. Now stretch a "junk" Chrony to 10 feet and......Well I'll let you know how I make out. [/QUOTE]
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