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d4570
.416 Rigby Joined: 27 January 2004 Location: United States Status: Offline Points: 9403 |
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Posted: 09 January 2013 at 02:56 |
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Remember: Four boxes keep us free ,the soap box, the ballot box, the jury box, AND the cartridge box
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they had some problems , early. but seem to have fixed them.
thanks Dale for the review, been thinking of getting one. My chrony is ancient. |
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CB900F
Administrator Honor, Integrity Joined: 10 June 2003 Location: Eritrea Status: Offline Points: 8857 |
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Fella's; I'll admit it's convienient, but I doubt that it's the most accurate of chronographs. With that short a spacing between the sensors, I'm not giving the plus/minus capabilities anything in the single-digit percentages. My Oehler 35 suggests that for anything over 3000 fps, you go to a four foot rail to get dead-nuts readings. Now the Oehler is about 20 years old & I'm sure that technology has advanced, but still. 900F Edited by CB900F |
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Birth certificate!? He don't need no steenkink birth certificate!!
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The working of this model is magnet, not light activated. the advantage is no screwing around with set up/tripod/alignment/etc. I saw them and talked to the reps at the big NRA show. Seems like a 'do it" thing. Now, when I use my chrony, I don't care where it shoots; I'm just checking MV as part of load development. I've heard complaints that it changes the point of impact about .5 inches. WOW, let's see attaches to barrel and changes harmonics...no mystery there. Getting it alighned and setting up tripod on other models, means being down range and if you shoot at a crowded place that sucks time. |
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Igbo Foo
Administrator .14 Flea Joined: 15 August 2003 Status: Offline Points: 567 |
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Whether or not it's light activated or magnetic sensors don't matter. Any of em's gotta time the interval between on and off in order to give you a speed. What switches on & off don't matter. So now you've got a clock tickin' away over a distance measured in inches. Seems to me at high bullet velocity you can have a helluva difference in announced speed for just one tick of difference on the clock. Don't care how fine they say they slice it, sounds fishy to me. FOO |
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Wombat Snorgging: Australia's mystery perversion, Elvis's secret shame.
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d4570
.416 Rigby Joined: 27 January 2004 Location: United States Status: Offline Points: 9403 |
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FOO Thats the same thing they said about an electric light bulb, you know that right? |
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Remember: Four boxes keep us free ,the soap box, the ballot box, the jury box, AND the cartridge box
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Foo you are right. In 1966 when I designed my first digital chronograph, I used a 10k hertz oscillator (those clicks); and 10 foot between frangible switches. But today you can have a high speed oscillator (ticking clocks) like a 10 gig Hz. so the margin of error of one click can be small enough for a few inches. Your right all the chronograph does is count pulses, and divide the distance between the screens/switches by the distance. The digital Avtrons also used the 10k oscillator and a binary counter. Decades later, in the late 1980s the Chrony was the first chronograph to use a ASIC chip for a chronograph and IIRC used a 100k oscillator. So the longer distances between the 'screens'/switches were necessary to get the desired accuracy. Ask CB he is pretty smart on this stuff. What is an electric light bulb? Is that those glass encased candles, I'm starting to see?
PS Edison did not invent the filament light bulb....he invented a evacuated glass bulb lamp. |
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Irish Bird Dog
.416 Rigby Too many Joined: 01 March 2009 Location: Midwest Status: Offline Points: 5511 |
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no experience here on subject,so for WIW, I ran the mango thingy site past a Electrical Engineer guy and he never saw one 'cept for the ad from them in link but feels the current technology would make it a feasable device.
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Irish Bird Dog
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