Date   

Re: Add USB to Scope?

stefan_trethan
 

I wonder if there is the reverse of a graphics card for the PC. Then
you could use the rear VGA out.
There sure are plenty of video capture devices, but I have never come
across anything to capture VGA. Of course you could convert it to
video but the resolution is likely insufficient.

Your software sure seems nice, but given a scope with working front
panel and screen it would never warrant the effort, only a plug-in
solution would be interesting.

ST

On Sat, Dec 26, 2009 at 12:22 PM, <dieter@cadt.de> wrote:
Thanks for looking. In fact youtube presents the screencast in two resolutions, both of which are not nearly representative of the full resolution graphics. On the other hand the avi file was like 100 MBytes.

My MS Windows application submits commands through the RS232 port. Those commands are short messages, like 10 characters each, somewhat similar to serial mouse messages. That works very well, i mean the Lecroy handles like 10 or 20 of those commands per second, just as if they came from the front panel encoders.

I agree that you can get still images by printing the screen over GPIB and capturing those data on a PC. And of course you can transfer trace files and format them into graphs, maybe once or twice per second.

What you cannot get with GPIB nor RS232 is realtime screen video. That requires adding the DVI sense wires. And it requires FPGA. Digital video is not another little microcontroller project.

Regards,
Dieter


Re: What to do with legacy scopes etc

Dave <dave@...>
 

Hi..

Also in the UK (North Bucks)

I'd be interested in the 7CT1N, if you've not already found a home for it.

Dave B.

--- In TekScopes@yahoogroups.com, "bobworsley92" <bobworsley92@...> wrote:


Hello group, thanks for the replies. Firt thing, I am in the UK which limits posting stuff around.

At the moment I am looking at a 547, 585A (sure it is an A, can't see the front at the moment) and a 545A (I think, again). To come is a Solartron CD1212, Cossor 339 and anything else that comes out from under the bench, behind the bed, everywhere!

All of it did work, but Dad not used it really for a few years, was 97 when he died so a possible excuse there. I know the Solartron is missing its output valves, E55Ls, used in the Tek 560 amps which I have. There is also a 1S1 and 1L10, both were working but not used for years.

I also have a CRT (154-0448-00) and 11B2A (x2) and 10A2A for a 647. A 5T11A from a 661 and a HP 186A switching time tester, I am still waiting to get a 185A scope for it after 20 years.

The 7000 scopes and plug ins are items collected from government sales. I used to have a thriving electronics design business, legislated out of existance, then started selling on expensivebay. That is rubbish now, so have lots of stock. All needs testing, most never powered up, selling untested stuff is pointless, even if it is just the CRT or the custom chips. I have several 7704As, several R7704s and several storage types like 7313, 7813 and 7623 etc. Also 100 or so plug ins, mostly 7A18, 7B80, 7A26 type of thing, also some 7S11 and 7T11A sampling and one 7CT1N.

I am trying to sort my web site out to list all this, but not my favourite job.

Bob


Re: Add USB to Scope?

Dieter Teuchert
 

Thanks for looking. In fact youtube presents the screencast in two resolutions, both of which are not nearly representative of the full resolution graphics. On the other hand the avi file was like 100 MBytes.

My MS Windows application submits commands through the RS232 port. Those commands are short messages, like 10 characters each, somewhat similar to serial mouse messages. That works very well, i mean the Lecroy handles like 10 or 20 of those commands per second, just as if they came from the front panel encoders.

I agree that you can get still images by printing the screen over GPIB and capturing those data on a PC. And of course you can transfer trace files and format them into graphs, maybe once or twice per second.

What you cannot get with GPIB nor RS232 is realtime screen video. That requires adding the DVI sense wires. And it requires FPGA. Digital video is not another little microcontroller project.

Regards,
Dieter

--- In TekScopes@yahoogroups.com, John Griessen <john@...> wrote:

dieter@... wrote:


About adding USB to Scope:
Recently i started a little FPGA project, description here:

http://www.cadt.de/notes/DesktopVI.pdf
<http://www.cadt.de/notes/DesktopVI.pdf>

I have to admit its a Lecroy DSO, but some of the ideas apply to various
T&M equipment with built in raster CRT screens.

The document contains a youtube link with a screencast. Please, have a
look and comment.

Regards,
D. Teuchert
The captured and decimated/compressed video looked great!

What was it like taking the mouse wheel and click commands back to the DSO?
That sounds like a lot of circuit mods, or was it? Were those just HPIB commands?

John
--
Ecosensory Austin TX


Re: Add USB to Scope?

victor.silva
 

I've had over a dozen jobs in R&D and I've never had a GPIB controller readily available. I could have rented one or obtained one but it would take time.

RS232 is slow and many new computers don't even have it anymore.

The other reason is both GPIB and RS232 would require application software running on a PC to get the image off the scope.

If the scope can produce standard image formats and write them to a floppy or USB that's really the best option. You can have an image file in a few minutes that can be used right away in a report.

--Victor

--- In TekScopes@yahoogroups.com, DaveC <davec2468@...> wrote:

I have a basic question regarding this topic:

Why?

Isn't it (more) straightforward to just use RS232 or GPIB to get
waveforms or such?

Ignorantly,
Dave


Re: Add USB to Scope?

Peter Gottlieb <hpnpilot@...>
 

Yes, when in a lab where you have a computer set up. When the scope is stand-alone (like when out in the field) it can be useful for the scope to do the waveform capture all by itself.



DaveC wrote:


I have a basic question regarding this topic:

Why?

Isn't it (more) straightforward to just use RS232 or GPIB to get
waveforms or such?

Ignorantly,
Dave


Re: Add USB to Scope?

DaveC <davec2468@...>
 

I have a basic question regarding this topic:

Why?

Isn't it (more) straightforward to just use RS232 or GPIB to get waveforms or such?

Ignorantly,
Dave


Re: Add USB to Scope?

John Griessen
 

dieter@cadt.de wrote:
About adding USB to Scope:
Recently i started a little FPGA project, description here:
http://www.cadt.de/notes/DesktopVI.pdf <http://www.cadt.de/notes/DesktopVI.pdf>
I have to admit its a Lecroy DSO, but some of the ideas apply to various T&M equipment with built in raster CRT screens.
The document contains a youtube link with a screencast. Please, have a look and comment.
Regards,
D. Teuchert
The captured and decimated/compressed video looked great!

What was it like taking the mouse wheel and click commands back to the DSO?
That sounds like a lot of circuit mods, or was it? Were those just HPIB commands?

John
--
Ecosensory Austin TX


Re: Add USB to Scope?

Alexandre Souza - Listas <pu1bzz.listas@...>
 

Ummm... actually, that's 'Shugart.' Just one 'G.' I know this because a friend of mine used to work for them.
Wow, thanks for remembering, I'm getting old :o)

BTW, this is the 26-pin connector pinout:
http://pinouts.ru/Storage/26pin_microfloppy_pinout.shtml

And this is the 34-pin connector pinout
http://pinouts.ru/Storage/InternalDisk_pinout.shtml

Just to be anal, here you are the 5 1/4 board edge pinout :o)
http://pinouts.ru/Storage/5_12_floppy_pinout.shtml

Have Phun!


Re: Add USB to Scope?

Bruce Lane
 

Good eve,

*********** REPLY SEPARATOR ***********

On 26-Dec-09 at 00:04 Alexandre Souza - Listas wrote:

5.25" and 3.5" floppies are a 34 pin cable (even since the days of CP/M,
apple II, and TRS-80) with data transfer over a single serial >line plus
drive select, head step and direction, motor control, etc. drives are
stupid.
The name of the standard is "Shuggart" because Shuggart drives were
the standard de facto for floppies.
Ummm... actually, that's 'Shugart.' Just one 'G.' I know this because a friend of mine used to work for them.

As an additional bit of trivia, Shugart developed the predecessor to SCSI in the form of SASI: The Shugart Associates Standard Interface. The pinouts and command protocols are very similar to SCSI-1.

Happy tweaking.


-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner & Head Hardware Heavy,
Blue Feather Technologies -- http://www.bluefeathertech.com
kyrrin (at) bluefeathertech do/t c=o=m
"Quid Malmborg in Plano..."


Re: Add USB to Scope?

Alexandre Souza - Listas <pu1bzz.listas@...>
 

5.25" and 3.5" floppies are a 34 pin cable (even since the days of CP/M, apple II, and TRS-80) with data transfer over a single serial >line plus drive select, head step and direction, motor control, etc. drives are stupid.
The name of the standard is "Shuggart" because Shuggart drives were the standard de facto for floppies.

that said, i'm 99% positive that you can build a cable to adapt from the tek 26-pin connector to a standard 34-pin floppy connector.
This is a very common adapter. The 26 pin connector is a flat cable one, eh? Usually old notebooks uses these drives, so it is a drop-in replacement.

Pinouts are avaiable in the hardware guide and pinouts.ru, feel free to ask me more info


Re: Add USB to Scope?

rscottdrysdale
 

floppies _ARE_NOT_IDE_!

IDE is a 40 pin cable with command and data transfer on 16 parallel lines plus r/w, address, and dma/irq. essentially it's an extension of the old AT bus - hence Integrated Drive Electronics. drives are intelligent.

5.25" and 3.5" floppies are a 34 pin cable (even since the days of CP/M, apple II, and TRS-80) with data transfer over a single serial line plus drive select, head step and direction, motor control, etc. drives are stupid.

that said, i'm 99% positive that you can build a cable to adapt from the tek 26-pin connector to a standard 34-pin floppy connector.

if you could point me to the tek document with the signal names, i'm sure i could tell you what to hook where...

--- In TekScopes@yahoogroups.com, "Dan Meeks" <dan-meeks@...> wrote:

The floppy in the TDS scopes that I have worked on are the 26 pin ribbon
connector.

I found a tech doc on line that gives the pin / function names, and compared
it to a standard IDE connected floppy.

Most of the signal names were the same, but not all.



Does anyone know if the old 26 pin style interface can be mapped to a
standard IDE port?



Thx

Dan



From: TekScopes@yahoogroups.com [mailto:TekScopes@yahoogroups.com] On Behalf
Of Joel Koltner
Sent: Thursday, December 24, 2009 11:54 AM
To: TekScopes@yahoogroups.com
Subject: [TekScopes] Re: Add USB to Scope?





--- In TekScopes@yahoogroups.com <mailto:TekScopes%40yahoogroups.com> ,
"Alex" <alexeisenhut@> wrote:
There are no IDE floppies. It would be like a SCSI keyboard, it makes no
sense.

I agree with you, but note that at one time there were SCSI floppy drives!


Re: Add USB to Scope?

dnmeeks
 

The floppy in the TDS scopes that I have worked on are the 26 pin ribbon connector.

I found a tech doc on line that gives the pin / function names, and compared it to a standard IDE connected floppy.

Most of the signal names were the same, but not all.

 

Does anyone know if the old 26 pin style interface can be mapped to a standard IDE port?

 

Thx

Dan

 

From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Joel Koltner
Sent: Thursday, December 24, 2009 11:54 AM
To: TekScopes@...
Subject: [TekScopes] Re: Add USB to Scope?

 

 

--- In TekScopes@..., "Alex" > There are no IDE floppies. It would be like a SCSI keyboard, it makes no sense.

I agree with you, but note that at one time there were SCSI floppy drives!


Re: TDS520B - Part Locations

cmbath
 

These parts are missing from the processor board (A11).

Sorry I should have mentioned this!

--- In TekScopes@yahoogroups.com, "cmbath" <cmbath@...> wrote:

Is anyone able to help out????

I am lost without a proper service manual:-(

Merry Christmas,

Chris

--- In TekScopes@yahoogroups.com, "cmbath" <cmbath@> wrote:

On the TDS520B I am trying to repair I have stupidly removed either R25 or R26 (a 0ohm link) and have not taken note of which one it was (I thought I had the component service manual but this is only for serial numbers 3000 and above, mine is below this).

Can anyone who has an early serial number TDS520B tell me which location the 0ohm link is installed in? I would appear that this resistor selects between two outputs from a counter (74HCT393 (U1173) pins 5&6). I am guessing a selection between two different frequencies F and 2F.

Thanks,

Chris


classic / old tektronix manuals for sale

walt_b5
 

i have a bunch of classic / old tektronix manuals for sale ;

1---1A1---dual trace plug - in

2---3A6---plug-in

3---3A72 ---plug-in

4---3S2---sampling unit

5---3S76---dual trace sampling unit

6---3T2---random sample sweep

7---3T77---sampling sweep unit

8---4S1---plug - in

9---5T1---plug-in

10---7A18---dual trace amp

11---7A22---differential amp

12---7B87---time base unit

asking $ 5 per manual ( two or more manuals cheaper )

contact me at wbelsito at aol dot com

thanks WALT


Re: 7704A Wavy Readout

John Gord
 

Jim,
You might want to re-check the low and mid frequency compensation of the vertical amplifier. The vertical shift from trace to readout can overshoot or undershoot if it is not adjusted properly.
--John Gord

--- In TekScopes@yahoogroups.com, Jim <w4jbm@...> wrote:

I have a 7704A that had a bad CRT a while back. After the replacement, there
were some issues with focus, intensity, and the readout, but I figured going
through the manual and getting everything "in-spec" would fix those--I just
hadn't had the time until the last two days.

The focus and intensity issues are fine now. But the readout issue is still
there and I'm stumped.

Basically the readout is "wavy"--the individual characters roll up and down
and a string of characters sometimes looks like it's on a sea-saw with one
side rising as the other falls. And there can be significant movement--close
to a half a vertical division.


Re: What to do with legacy scopes etc

Brian
 

Hi Bob , I am in south London . I have a 564 storage scope and could be interested in plug-ins . I also have a 661 sampling scope (5T11A) as well as an interest in such things as 7S11 - 7T11(A) as I have 4 x 7844 ,2 X 7104 , 7854 and a 7834 . I am also interested in parts items at the right price .
regards
Brian .

--- In TekScopes@yahoogroups.com, "bobworsley92" <bobworsley92@...> wrote:

Hello group, been following the complaints about old scopes etc being disintegrated for their valves. Whilst I fully agree, on the other hand what do you do with them?

I have just re-inherited all the old test equipment I gave to my dad, he has recently died. I just don't have room for it, I could use it but it is not exactly portable like a 466 or similar. I also have a pile of 560 scope stuff of my own, and that now never gets used.

I did try selling some items on e(xpensive)bay but mostly no interest at all. On the second attept I sold the General Radio 1932A distortion analyser in almost new condition.

I was interested in the link to audiotubes web site, and the prices the valves get. As far as I can see that is the only way to get a reasonable sum for the scopes. At least part of them lives on.

Similarly the Sphere web site gives an idea on the prices for newer spares, prehaps all these 7704s I have are also for the chop.

Any suggestions other than giving it away? scrap prices are better than that.

Bob


Re: 7704A Wavy Readout

teamlarryohio
 

"Tom Miller" <tmiller@skylinenet.net> wrote:
Is the waviness synchronized to line voltage? What do you see with 60
Hz line signal feed into the vert in?

I would look at the power supplies first as always.
Also make sure your V-H inhibit signal is getting intact to the
vertical interface board from the readout board.
-ls-


Re: 7704A Wavy Readout

Tom Miller <tmiller@...>
 

Is the waviness synchronized to line voltage? What do you see with 60 Hz line signal feed into the vert in?
 
I would look at the power supplies first as always.
 
Tom
 
 

----- Original Message -----
From: Jim
Sent: Friday, December 25, 2009 5:11 PM
Subject: [TekScopes] 7704A Wavy Readout

 

I have a 7704A that had a bad CRT a while back. After the replacement, there
were some issues with focus, intensity, and the readout, but I figured going
through the manual and getting everything "in-spec" would fix those--I just
hadn't had the time until the last two days.

The focus and intensity issues are fine now. But the readout issue is still
there and I'm stumped.

Basically the readout is "wavy"--the individual characters roll up and down
and a string of characters sometimes looks like it's on a sea-saw with one
side rising as the other falls. And there can be significant movement--close
to a half a vertical division.

The thing that's really strange is that if I slow the sweep speed down, the
wave slows down and becomes more pronounced. If I increase the sweep speed,
the waving goes away, but there's a "ghost" around the character, so I think
it's really just "waving" so fast that it gives the appearance of stability.

And it's not just the sweep speed. If I feed a vertical plug-in with a
function generator and set the sweep at some midpoint, as I set the function
generator to a lower frequency the speed of the waving goes down and if I set
the function generator to a higher frequency the speed of the waving goes
down. And, again, if I get fast enough it really just becomes a stable but
blurred character.

The motion seems to be strictly vertical--I've watched closes and don't see a
hint of any instability in the horizontal direction with the readout
characters.

I have changed out the readout board, the signal output board, and the
vertical interface board with those from a parts unit and have the exact same
symptoms.

The distortion is strictly on the readout--you can get a good, stable display
of the waveform itself. If you ground the input, the waving stops.

Any of that make sense to anyone? I've run out of boards that are in the path
(other than the z-axis board and I don't have a working spare for it). Like I
said, I'm stumped at this point.

thanks,
Jim


7704A

Pete
 

not sure of the particular circuit of this model,but i would start by checking any supply voltages for ripple and unwanted distortions.
a model of that age should really have the power supply (at least)  re-capped anyhow.

seasons greetings....Pete


7704A Wavy Readout

Jim
 

I have a 7704A that had a bad CRT a while back. After the replacement, there
were some issues with focus, intensity, and the readout, but I figured going
through the manual and getting everything "in-spec" would fix those--I just
hadn't had the time until the last two days.

The focus and intensity issues are fine now. But the readout issue is still
there and I'm stumped.

Basically the readout is "wavy"--the individual characters roll up and down
and a string of characters sometimes looks like it's on a sea-saw with one
side rising as the other falls. And there can be significant movement--close
to a half a vertical division.

The thing that's really strange is that if I slow the sweep speed down, the
wave slows down and becomes more pronounced. If I increase the sweep speed,
the waving goes away, but there's a "ghost" around the character, so I think
it's really just "waving" so fast that it gives the appearance of stability.

And it's not just the sweep speed. If I feed a vertical plug-in with a
function generator and set the sweep at some midpoint, as I set the function
generator to a lower frequency the speed of the waving goes down and if I set
the function generator to a higher frequency the speed of the waving goes
down. And, again, if I get fast enough it really just becomes a stable but
blurred character.

The motion seems to be strictly vertical--I've watched closes and don't see a
hint of any instability in the horizontal direction with the readout
characters.

I have changed out the readout board, the signal output board, and the
vertical interface board with those from a parts unit and have the exact same
symptoms.

The distortion is strictly on the readout--you can get a good, stable display
of the waveform itself. If you ground the input, the waving stops.

Any of that make sense to anyone? I've run out of boards that are in the path
(other than the z-axis board and I don't have a working spare for it). Like I
said, I'm stumped at this point.

thanks,
Jim

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