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" <[email protected]> To: "Discussion of precise time and frequency measurement" <[email protected]> Subject: Re: [time-nuts] Lightning Strike Site (Jim Lux) Message-ID: <EF06D912BDF74BE6BE916C3088B7F68B@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" <[email protected]> To: <[email protected]> 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. > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
