PSN-L Message - Subject: RE: Dataq DI-194RS Question

Bob,<= /DIV>

Thanks for the information. Like you, I couldn't get = Mauro's=20 program to work, but I did get AmaSeis to work - at least it did for a = while. As to the screen resolution, I'm not sure why the program = I=20 loaded from the starter package CD opens up in 640 resolution instead = of=20 1024. I'm going to play with it some more. That's = not the=20 only problem I'm having with this laptop though. I tried to = install=20 ActiveSync (which came with my HP Pocket PC), but it won't read to any = of the=20 COM ports!!! Our IT guy was telling me this afternoon, that it's = likely=20 a bug with the Dell version of Windows XP Professional. He's = going to=20 mess around with it tomorrow.

By=20 the way: I've developed a circuit to measure 1 to 50 Pf of=20 capacitance and feed it as a current loop to a remote point. I'm = thinking of building a horizontal pendulum seismograph similar to = the=20 Shackleford-Gunderson, except without the RF oscillator. Has = anyone had=20 any experiences along these lines? I'm going to build it in a = leftover=20 enclosure built of a welded 5/8 inch thick aircraft = aluminum. Picture a frame that's = 20 inches long;=20 10 inches wide and 4 inches thick. One open side is made of 1 = inch thick=20 Plexiglas. bolted at 2 inch intervals. I had originally designed = this to=20 be a vacuum chamber for a project involving leaking welds. The = company=20 sponsoring the project was sold, and the project was=20 canned.

At=20 any rate, what I'm thinking of doing is to make the hanging arm out of = 1" x=20 1/2" x 15" aluminum, suspended with stainless-steel thin gauge safety=20 wire. Halfway along the rod I'll mount a 10 pound machined = plumber's=20 weight, in which I'll machine a rectangular hole. The = bottom of the=20 rod will pass between two electrically 'floating' gates. The = capicitance will=20 be that measured between the gates and the rod. Hopefully, it'll = work. If not, it'll at least keep me out of the wife's hair for = a few=20 weekends. In case anyone's curious about my supply of aircraft = aluminum,=20 I bought about one hundred plus pounds of it at the = Rockwell-Collins=20 surplus outlet in Marion, Iowa several years ago.

Since I live in the Texas Hill Country north of San Antonio, = the=20 limestone bedrock is less than 6 inches below the grass in the=20 yard.

Thanks everyone, for your comments and = suggestions.

Cheers,

Mike=20 Lozano

San=20 Antonio, Texas

-----Original Message-----
From: = Bobhelenmcclure@.......... [mailto:Bobhelenmcclure@........
Sent: Sunday, June 06, = 2004 9:11=20 PM
To: mikel@...............
Subject: Re: Dataq = DI-194RS=20 Question

In a = message dated 6/6/2004=20 5:35:23 PM Eastern Daylight Time, mikel@............... = writes:

I'm now going to install the AMSEIS software, as well = as the=20 version Mauro wrote.

Hi = Mike,

I'm=20 pleased to hear you solved your problem, even if I cannot fathom how = you=20 could get different screen resolutions on recording and playback. I = assume=20 you know that you can make the screens any size you want by dragging = on the=20 border. The monitor screen should always display whatever resolution = you set=20 up in Windows.

I operate three broadband sensors, = using a=20 DI-154 at 5 samples per second per channel. Keeping accurate time is = important to me, so I make minute marks on my recordings using a = signal=20 derived from a WWVB controlled wall clock. I cannot use AmaSeis = because it=20 does not record my marks which are applied to the DI-154/194 digital = input.=20 It also records only one channel, and has at most 12 bit resolution. =

The Dataq Lite recorder can record up to 4 channels, = accepts=20 the minute marks, and uses a sample rate of 240 samples per second, = which is=20 averaged down to the recorded rate. I get 14 bits resolution because = of=20 this.

Mauro sent me the Dataq version of SeismoWin, = but it=20 would never work for me. If you use it, I would like to know about = it. It=20 accepts more than one channel, but at less resolution than the Dataq = recorder. Like Amaseis, its timing accuracy is only as good as the = PC=20 clock.

I have written a lot of seismic = applications for=20 the Dataq serial devices using Visual Basic 6.0. You can look at my = stuff=20 at

=20 = http://www.jclahr.com/science/psn/mcclure/

Regards,

Bob=20 McClure

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