[time-nuts] Need usb time interval time for portable bullet chrongraph

Don Latham djl at montana.com
Mon Aug 27 19:02:58 UTC 2012


amen to that, brother Bob!
Don
Bob Camp
> Hi
>
> All of the "good stuff" in a chrono is in the trigger part of it. Even
> with
> very well designed triggers, there is a lot of ambiguity (by Time Nut
> standards) in the measured time of flight. A simple time base and
> counter is
> way more than adequate for the digital end of the device.
>
> Bob
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Don Latham
> Sent: Monday, August 27, 2012 1:52 AM
> To: Paul Cianciolo; Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Need usb time interval time for portable bullet
> chrongraph
>
> Hi Paul:
> I'm presently adapting a chrony chronograph because I want to use the
> triggers for timing and other purposes. They've spent a LOT of
> engineering time to get proper triggering, and the triggers can easily
> be pulled off without disturbing the basic unit. The triggers are robust
> and will drive a piece of coax with a nice pulse at a 5 v level. The
> cheapest chrony is under $100 and using their triggers will save you
> HOURS and HOURS of fiddling around, trust me!
> You can use something like an arduino which has two interrupt inputs to
> do the time measurement, or as Tom suggests.
> Don
>
> Paul Cianciolo
>> Hello Folks
>>
>> I have been looking at bullet chrographs and wondering if I could get
>> the a usb module to do a interval measurement and display on my
>> laptop.
>> on a yet to be discovered module to calculate the time interval
>> between
>> the pulses?
>>
>> The bullet travels at approx 1050 feet per second.
>> By spacing my gates providing the start stop pulses precisely 1 foot
>> apart I think a direct read out except for the decibal point being in
>> the wrong place .
>>
>> Does this seem fesable?
>>  
>> Here is one module I found
>> http://www.weedtech.com/index_eventcount.html
>>  
>> Any thoughts on this?
>> The reason for the USB would be for display on my laptop at the firing
>> range
>>
>> Thank you for any help I would really appreciate it
>>
>> PaulC
>> W1VLF
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>
>
> --
> "Neither the voice of authority nor the weight of reason and argument
> are as significant as experiment, for thence comes quiet to the mind."
> R. Bacon
> "If you don't know what it is, don't poke it."
> Ghost in the Shell
>
>
> Dr. Don Latham AJ7LL
> Six Mile Systems LLP
> 17850 Six Mile Road
> POB 134
> Huson, MT, 59846
> VOX 406-626-4304
> www.lightningforensics.com
> www.sixmilesystems.com
>
>
>
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> To unsubscribe, go to
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>


-- 
"Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind."
R. Bacon
"If you don't know what it is, don't poke it."
Ghost in the Shell


Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com






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