[time-nuts] A little quick advice, please

[J. Forster]

I think you can use the 7854 to digitize the output of the sampling PIs.
The place to ask is Tekscopes2. You might need to do a small mod to the
7T11A for proper triggering. I vaguely remember seeing it in a manual
(7854 or 7T11A ??) somewhere.

As I remember the 7854 A/Ds don't work with the SA PIs, which generate
their own displays, but do work with all other PIs.

FWIW,

-John

===============

> 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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>> > >
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