From: "Larry Cochrane" <cochrane@..............> Subject: Re: WinSDR alarm settings Date: Sat, 6 Apr 2002 16:11:58 -0800
Benji,
----- Original Message -----
From: "Benji & Wendi Johnson" <wjohnson@........>
To: "Larry Cochrane" <cochrane@..............>
Sent: Friday, April 05, 2002 10:02 PM
Subject: Re: WinSDR alarm settings
> Larry,
> My apologies for my frequent questions, but I have one more for you
> regarding the alarm settings:
>
> Under "Alarm Settings", what is the difference between the Pre-Trigger
> Time and Trigger Time settings on the left side of the window, and the
> Auto Save Time Settings "Before Event" and "After"? Isn't the purpose
> the same for both, or am I missing something?
The Trigger information on the left side of the Alarm dialog box is used to
trigger event files. The Auto Save Time info is used to control the length
of the event files after an event has triggered WinSDR.
>I noticed that when I
> tried to set the Pre-Trigger time to 300 seconds (5 minutes), I was only
> allowed to set it up to 60 seconds.
Yes, you only want a short time for the Pre-Trigger time. This setting and
the Trigger Number are used to filter out spikes in the data. The
Pre-Trigger timer is set when the STA/LTA ratio gets equal too or high then
the STA/LTA Ratio number. The channel will go into an alarm state if the
ratio stays equal too or high then the STA/LTA Ratio number for Trigger
Number of times within the Pre-Trigger time period. Once the channel
triggers, the pre-trigger timer is cleared and trigger time is set to the
Trigger Time. The channel can't trigger again until this timer times out.
Hope this helps.
-Larry
>
> Larry Cochrane wrote:
>
> >Benji,
> >
> >Yes to all three....
> >
> >-Larry
> >
> >----- Original Message -----
> >From: "Benji & Wendi Johnson" <wjohnson@........>
> >To: "Larry Cochrane" <cochrane@..............>
> >Sent: Wednesday, April 03, 2002 9:09 PM
> >Subject: WinSDR alarm settings
> >
> >
> >>Larry,
> >> On your WinSDR documentation webpage you provide a link to a very good
> >>source of information regarding STA/LTA triggering at
> >>http://www.seismo.com/msop/nmsop/08%20networks/IS8.1/IS8.1.html where
> >>they provide some excellent descriptions and explanations.
> >>
> >> My questions for you:
> >>1) Under the WinSDR Alarm Settings, is the "STA/LTA Ratio" setting
> >>equivalent to the "STA/LTA trigger threshold level", as described at the
> >>above mentioned site?
> >>2) Is the WinSDR "Pre Trigger Time" setting equivalent to the
> >>"pre-event time (PEM) parameter"?
> >>3) Is the WinSDR "Trigger Time" setting equivalent to the "post-event
> >>(PET) parameter"?
> >>
>
>
>
.