[time-nuts] Lightning Strike Site, Latency of AS3935 IRQ output

[Alan Melia]

:-))  sorry Tom I couln't resist the "dig" but it looks like the result was 
interesting and a little unexpected ! its always better to measure it 
yourself, where possible,  than rely on datasheets which can sometimes be 
quite "imaginative"

Well done
Alan
----- Original Message ----- 
From: "Tom Bales" <tob at starhouse.org>
To: "time-nuts" <time-nuts at febo.com>
Sent: Monday, September 16, 2013 6:21 PM
Subject: [time-nuts] Lightning Strike Site, Latency of AS3935 IRQ output


> Alan,
>
> Well, you shamed me into actually setting it up and measuring the IRQ
> delay.  Amazingly, the delay varies from 25 to 110 milliseconds, depending
> upon what type of triggering is involved.  I did the test using their
> "lightning simulator" and measuring the delay between the magnetic pulse
> the simulator creates and switching of the IRQ line.  Makes you wonder 
> what
> a little processor could possibly be doing for a whole tenth of a second.
>
> Tom Bales
>
>
> Message: 3
> Date: Tue, 10 Sep 2013 00:34:49 +0100
> From: "Alan Melia" <alan.melia at btinternet.com>
> To: "Discussion of precise time and frequency measurement"
>        <time-nuts at febo.com>
> Subject: Re: [time-nuts] Lightning Strike Site (Jim Lux)
> Message-ID: <EF06D912BDF74BE6BE916C3088B7F68B at gnat>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>        reply-type=response
>
> Come on fellas it can't be that difficult to input a pulse to the chip and
> measure the prop delay to the INT pin ....this is timenuts after all :-))
>
> Alan
> G3NYK
> ----- Original Message -----
> From: "Jim Lux" <jimlux at earthlink.net>
> To: <time-nuts at febo.com>
> Sent: Tuesday, September 10, 2013 12:08 AM
> Subject: Re: [time-nuts] Lightning Strike Site (Jim Lux)
>
>
>> On 9/9/13 3:52 PM, Mark Sims wrote:
>>> The AS3935 has an INT output pin that signals a detection.   You could
>>> monitor that.  The AS3935 is based upon an internal DSP processing the
>>> receiver output.  No telling how long between when the strike occurs and
>>> when INT is activated.
>>
>> I'd send a nice note to the folks in Austria who make the part and ask
>> them.
>>
>> I suspect, also, that you might be able to figure out some other 
>> lightning
>> sensor electronics: the Boltek unit wasn't all that complex, looking at
>> the PC board, but I didn't have a schematic.
>>
>>
>>
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