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Message from discussion Why no delayed trigger on newer DSOs?
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Tom Bruhns  
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 More options Aug 13 2007, 3:47 pm
Newsgroups: sci.electronics.design
From: Tom Bruhns <k7...@msn.com>
Date: Mon, 13 Aug 2007 12:47:17 -0700
Local: Mon, Aug 13 2007 3:47 pm
Subject: Re: Why no delayed trigger on newer DSOs?
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On Aug 13, 12:19 pm, Joerg <notthisjoerg...@removethispacbell.net>
wrote:

> Hello Folks,

> Question: It seems that most portable DSOs in the 200MHz/1GSPS class
> don't offer delayed trigger anymore which makes pulse-echo measurements
> a real pain. Why don't they?

> After all it's just a simple counter that is needed. Same for hold-off
> which typically ain't there either :-(

> Beats me but IIRC I used delayed trigger on a lower end TDS220 although
> its data sheet said that it could not do it. However, that scope had
> some other serious issues (noise) so I asked the client to obtain a used
> 2265. Old Faithful, of course, always has delayed trigger but sure
> enough the plastic clutch for that function fell apart right away.
> Designing a trigger delay into an analog scope is no small feat but for
> a DSO it should be really easy.

> --
> Regards, Joerg

> http://www.analogconsultants.com

Is this a "when are you going to stop beating your mother" sort of
question?  Check out the Agilent 5000 series of scopes, listed as
"new" on the Agilent web site today.  Trigger delay range:  pre-
trigger, the greater of 1 screen or 125usec; post-trigger 1 second
range minimum, up to 500 seconds for slower timebase settings.

On bottom-end scopes, especially ones with deep memory, trigger delay
may well be dropped for a combination of reasons:  the desire to
differentiate the product line, and the lower need given lots of
memory--acquire once, inspect in detail wherever you want.  One of my
DSOs doesn't have specific trigger delay, but does let you set up the
display of any portion of the memory, as a "delayed trace".


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