[time-nuts] A little quick advice, please

Robert Darlington rdarlington at gmail.com
Sun Oct 31 18:42:54 UTC 2010


Hi Alan,

My $200 Tek 7854 mainframe with the 7S11/7T11 combo take my old scope up
high enough to look at 13-14GHz repetitive signals.  I don't think it can
take a screen shot or do much if any analysis with these plugins though but
they're still handy for a lot of things.  I love the digital storage analog
scopes of the 80s but the modern digital scopes have their place too.

-Bob

On Sun, Oct 31, 2010 at 12:13 PM, Alan Melia <alan.melia at btinternet.com>wrote:

> Sampling scopes will display repetative signals above the sampling
> frequency
> if the repetition rate of the signals and sampling rate are not
> related....there were GHz bandwidth scopes in the 60s using this method.
> Not
> a lot of good on single shot though. PC scopes are quite good for
> repetative
> slow signal and single shot within their sampling rate. i have a Pico Tech
> 50Ms/s which works well with a simple old laptop.....it requires a parallel
> port so was quite cheap on that auction site we love to hate.
>
> It is a case with ALL measuring equipment you been to know HOW it works to
> interpret what it telling you.
>
> Alan G3NYK
>
> ----- Original Message -----
> From: "William H. Fite" <omniryx at gmail.com>
> To: "Discussion of precise time and frequency measurement"
> <time-nuts at febo.com>
> Sent: Sunday, October 31, 2010 5:06 PM
> Subject: Re: [time-nuts] A little quick advice, please
>
>
> > Robert said;
> > Bitscope headlines "100MHz analog bandwidth" but you have to big a bit
> > deeper to find "up to 40Ms/s". Seems like they are wasting most of the
> > bandwidth if the have an anti-alising filter. This is really only usable
> to
> > 20MHz single shot.
> >
> > Yes, I noticed that, too.  Almost sounds like deceptive advertising.
> >
> >
> >
> >
> > On Sun, Oct 31, 2010 at 11:28 AM, Robert Atkinson
> <robert8rpi at yahoo.co.uk>wrote:
> >
> > > Hi Bill,
> > > It depends what you need/want. There are issues with the PC based
> 'scopes.
> > > Most obvious to the user is response time. It can be fustrating to have
> the
> > > screen change a second after the event happened! Other issues are
> sample
> > > rate and input voltage range. The Bitscope headlines "100MHz analog
> > > bandwidth" but you have to big a bit deeper to find "up to 40Ms/s".
> Seems
> > > like they are wasting most of the bandwidth if the have an anti-alising
> > > filter. This is really only usable to 20MHz single shot.
> > >  I could not find the input sensitivity and ranges. I looked at the
> > > BitScope a while ago and decided it was overpriced at $600. I was lucky
> to
> > > find an HP 54645D for the same money. Unless you need the PC
> connnectivty
> > > and simple logic analyser (the 54645D gives both ;-), I'd look at a
> > > conventional 'scope. As you are considering a PC 'scope, have a look at
> the
> > > Pico Technolgy range,
> > > http://www.picotech.com/oscilloscope-specifications.html Their
> bandwith
> /
> > > sample rates make more sense. I've used their products and they work
> very
> > > well.
> > >
> > > Robert G8RPI.
> > >
> > > --- On Sun, 31/10/10, William H. Fite <omniryx at gmail.com> wrote:
> > >
> > > From: William H. Fite <omniryx at gmail.com>
> > > Subject: [time-nuts] A little quick advice, please
> > > To: "PC Oscilloscope" <time-nuts at febo.com>
> > > Date: Sunday, 31 October, 2010, 13:35
> > >
> > > 'morning, folks,
> > >
> > > I was just on a verge of purchasing a Tek TDS1012 scope when a friend
> > > suggested that I could save a chunk of change by buying a BitScope.
> > > Although
> > > I've been aware of PC scopes, I never really looked into them.  The
> specs
> > > look pretty good (the fact that I was looking at an entry-level Tek
> will
> > > give you some idea of my needs).
> > >
> > > Anyone have any experience with BitScope or other of the low-end PC
> scopes?
> > >
> > > Thanks,
> > >
> > > Bill
> > >
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