[time-nuts] A little quick advice, please

[Alan Melia]

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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