Re: 7854 vs 7D20

Daniel Koller
 

Dennis,
  Is that FFT program available to us?
  Dan

On Wednesday, December 13, 2017, 1:41:34 AM EST, 'Dennis Tillman' @Dennis_Tillman_W7pF [TekScopes] <TekScopes@...> wrote:

 
Hi Harvey and Cliff
,
The 7D20 is spec'd at 70MHz and 40MSamples/Sec. It is also GPIB compatible
so it is programmable.

The 7854 is also GPIB compatible but in addition it has its own built in
vector processing programming language. That was another thing that made the
7854 revolutionary when it came out. It was the first scope with its own
vector processing language. Unfortunately electronics engineers were
programming illiterate in those days and that feature actually discouraged
sales so Tek quietly stopped promoting it in their ads and in their
literature.

To this day I have not found more than a handful of 7854 programs in spite
of doing an exhaustive search of all of the EE magazines in the 1980s and
1990s. However, all that changed a few months ago when Holger Lubbin (a
member of TekScopes and a dedicated fan of the 7854) wrote what must be the
largest 7854 program ever written. It calculates the FFT of the signal
stored in the 7854 memory. Unfortunately the 7854 did not have floating
point math, a fast microprocessor, or lots of storage (3 things you need to
do an FFT) so it is not practical except as a proof of what the 7854 was
capable of.

Dennis Tillman W7PF

-----Original Message-----
Sent: Tuesday, December 12, 2017 8:25 PM
Subject: Re: [TekScopes] 7854 vs 7D20

On Wed, 13 Dec 2017 02:54:49 +0000, you wrote:

I already have a working 7854 and a good assortment of 7000 series
plug-ins. What would a 7D20 add that the 7854 cannot do or can only do
poorly or with difficulty? Is the 7D20 compatible with the 7854?

To the best of my knowlege, the 7D20 was used to add digital storage rather
specifically to the 7600 scopes, giving you a large screen digital scope. I
think that the digital bandwidth is about 20 Mhz or so.

With the additional processing in the 7854, the higher bandwidth, I can't
think of anything in particular the 7D20 would give you.

if you're looking for relative oddities, then a 7A42 logic plugin (4 trace,
dual width, somewhat of a logic analyzer, might be an idea.

Harvey

Cliff Carrie
------------------------------------
Posted by: Harvey White <madyn@...>
------------------------------------


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