Date   

Re: Scope Cameras

John Williams
 

I have a Tektronix video camera that mounts directly on the crt the same as the Tek still Polaroid cameras. There was a camera for sale on eBay a while back, all that is required is a “brick” to supply power to the camera. I believe Dennis Tillman made a still camera mount for this purpose.


Re: Scope Cameras

Harvey White
 

Haven't done much more than to consider the idea.

However, my experience is with canon EOS products.

Canon EOS stuff is apparently worth *nothing* when a new model comes out (I certainly couldn't get much for a 60D when I bought a 70D).

So any of the older canon models should be a starting point.

I'd be tempted to use a canon 10D (not sure when that's going to happen yet), but it takes a 2.5 mm phone plug to trigger it.  I'd think that some minor electronics slaved to the Tek scope camera electronics (haven't looked at that yet but I'd consider it strongly).   I'd want to consider a 50mm lens with an extender, make sure that it carries the signals with it, and then rework the scope camera back (and lens, sadly, and likely the electronics) to get a decent coverage.  I would not expect the existing lens in the scope camera to work simply because of the distance between the focal plane and the lens.  Since the original camera used a standard shutter and the canons use a focal plane shutter, expect a few differences there.

I'd think that a standard camera with a remote release, a few bits of electronics to control the shutter, and a lens extension tube might just get the job done.  IF you can do this with a phone, or a point and shoot, that's good.  Haven't played with that although I could.  An advantage of the DSLR is that if you can dig live video out of them, then you have a way of getting straight video off the scope screen into a monitor.

Just ideas, though.

Harvey

On 3/15/2020 3:31 PM, Robin_Birch wrote:
All,

I'm currently playing around with the Scope Hood models that were recently
posted on here (Thanks Michael). I'm starting to think about extending
these to make a modern scope camera, Polaroid film packs being made out of
pure unobtainium.


Has anyone got any experience of different digital cameras that would be
suitable: Electric release, able to extend exposure to max sweep on a 4
channel scope plus data painting, able to reduce exposure to fastest
position, plus any other frills that people can think of that are necessary.
The body would have to be suitable to mount on a hood, or possibly within
one. The lens would have to be able to focus down to a reasonable distance
and have a zoom that was adjustable to frame the screen.


Ideas anyone?


Robin


PS: I'd probably be putting this on a 7000 or a 468.




Re: Scope Cameras

greenboxmaven
 

Polaroid film is not going quietly into the darkness. There are continual requests from photographers to re-open production of the peel apart film packs, there is a single photo single use cartridge for Polaroid pack cameras available from Austria but it costs almost $10.00 per exposure. The dual seperate roll film for the older cameras has not been made for over 25 years, there are also continual requests for it to be produced again. Adapting phones or digital cameras is one possibility, but depending on the speed of the sweep a real photograph is still the best. Analog photography is rebounding in popularity, and Polaroid has been bought out by another company that is making film for some of the cameras. Fuji refused to continue making Polaroid peel-apart packs, the pressure on the new Polaroid company to produce them again is intense. Whether these requests will be considered worthy is unknown. Fuji does make several instant cameras, their Instax series. The cameras are in production and easy to buy, the film packs usually cost about $1.25-2.00 per exposure. The film is very fast, ASA 800, so getting the exposure correct would require filters and alterations to the shutter. New Polaroid cameras and their film packs are easily available and not too expensive, but the same sort of filtering and shutter modifications would be needed. It could be interesting to get home brew photography mavens involved. The good thing about all of this is that scope traces are very bright, so less sensitive photo media could be used.

Bruce Gentry, KA2IVY

On 3/15/20 3:31 PM, Robin_Birch wrote:
All,

I'm currently playing around with the Scope Hood models that were recently
posted on here (Thanks Michael). I'm starting to think about extending
these to make a modern scope camera, Polaroid film packs being made out of
pure unobtainium.

Ideas anyone?

Robin


PS: I'd probably be putting this on a 7000 or a 468.




Re: Scope Cameras

 

Hadn’t thought of a phone. Was thinking more along the go pro sort of thing. Hmmm, have to think about that

Cheers

Robin

On 15 Mar 2020, at 20:05, Mlynch001 <mlynch002@gmail.com> wrote:

I have already built a prototype that uses an I-Phone to take pictures. I have not done enough with this to answer most of these questions. The I-Phone does a presentable job. It can be done with some additional work.

--
Michael Lynch
Dardanelle, AR



locked Re: Tesla Coil help needed

 

Hi Tony,

I have not forgotten about your Tesla coil you inquired in the other thread. I have no prior knowledge on how to build such a thing, although the principle is rather simple.
For circuit diagrams, I recommend that you google "Tesla coil circuit diagram" and you will see a bunch of different circuit diagrams, which give an idea of how they work.

It all starts with that metal box you had in your hand, with pins to "input" and to "load". This can be a line filter preceding the 60 hz step-up transformer that avoids getting the noise of the tesla coil into your home wiring.
Then comes the step-up transformer, in your case with a symmetrical secondary of 12 kV, (each half or between the two ends?) which can be safer than single-ended. This will give you 12 kV at 60 Hz that will feed the coil.

The 12 kV secondary connects to a capacitor bank in series with the "primary" of the tesla coil. This "primary" is what you wind with the copper tube around the concentric tesla coil that came already winded.
The capacitor bank is built with the 16 2 kV capacitors in series, with the many 20 Mohm resistors across these capacitors to help divide the total voltage across the bank equally among the many capacitors in series.

So the 12 kV will charge the capacitor bank through the tesla "secondary" to the high voltage.

What I see missing in your set is the SPARK GAP, This spark gap connects across the 12 kV secondary, also in parallel with the capacitor bank plus tesla "primary" in series. The purpose of the gap is short out the 12 kV before it reaches its peak, in this way discharging the capacitor bank through the tesla "primary' in a huge jolt of current, that induces in the long tesla (secondary) coil the huge voltage that makes the fireworks! (the 12 kV transformer is not affected by this sudden short because of its large stray inductance).

Maybe you find some guidance, especially in fabricating the spark gap, in the following video by someone who is building the tesla coil:

https://www.youtube.com/watch?v=yY8lGmibGVY

Have fun, and let me know how it works out and any further questions.

Regards,
Ernesto


Tektronix 491 band C (solid state version) varactor diodes

Miguel Work
 

Hi,

I´m searching for a replacement diode for a TEKTRONIX 491. Is marked as MA45601. I have replaced with a BB405, and PLL now works well, but If is possible I would like to put original ones or equivalent, ceramic body Ghz band diodes, in the MACOM catalog I don’t see it.
Any know where to find them?

Some photos in my album:

https://groups.io/g/TekScopes/album?id=86588


Thanks!




https://groups.io/g/TekScopes/photo/86588/3?p=Created,,,20,2,0,0

-----Mensaje original-----
De: TekScopes@groups.io [mailto:TekScopes@groups.io] En nombre de Mlynch001
Enviado el: domingo, 15 de marzo de 2020 21:05
Para: TekScopes@groups.io
Asunto: Re: [TekScopes] Scope Cameras

I have already built a prototype that uses an I-Phone to take pictures. I have not done enough with this to answer most of these questions. The I-Phone does a presentable job. It can be done with some additional work.

--
Michael Lynch
Dardanelle, AR


Re: Scope Cameras

Mlynch001
 

I have already built a prototype that uses an I-Phone to take pictures. I have not done enough with this to answer most of these questions. The I-Phone does a presentable job. It can be done with some additional work.

--
Michael Lynch
Dardanelle, AR


Scope Cameras

 

All,

I'm currently playing around with the Scope Hood models that were recently
posted on here (Thanks Michael). I'm starting to think about extending
these to make a modern scope camera, Polaroid film packs being made out of
pure unobtainium.



Has anyone got any experience of different digital cameras that would be
suitable: Electric release, able to extend exposure to max sweep on a 4
channel scope plus data painting, able to reduce exposure to fastest
position, plus any other frills that people can think of that are necessary.
The body would have to be suitable to mount on a hood, or possibly within
one. The lens would have to be able to focus down to a reasonable distance
and have a zoom that was adjustable to frame the screen.



Ideas anyone?



Robin



PS: I'd probably be putting this on a 7000 or a 468.


locked Re: Tesla Coil help needed

Paul Amaranth
 

This is just too far off topic for this group. You should check into
some of the general or specialized electronics forums around the web.
Here, for example, is a forum dedicated solely to Tesla coils:

https://4hv.org

On Sun, Mar 15, 2020 at 01:41:16PM -0500, Tony Fleming wrote:
I understand, but people who are into electronics are also playing around
with "gizmo gadgets" like Tesla Coil.
That is the only reason I've mentioned it to you.
The problem with the Google search is it's limitations and in my case,
probably lack of expert use of Google search engine.
Many TC are there but my "kit" is specific to a design that I do not have.
On my side, I thought you might know someone or even yourself some
information to make this into a functional TC.
Have a great Sunday my friend.
Tony

On Sun, Mar 15, 2020 at 12:54 AM Roy Thistle <roy.thistle@mail.utoronto.ca>
wrote:

On Sat, Mar 14, 2020 at 09:18 AM, Tony Fleming wrote:


I have a Tesla Coil
Hi Tony:
I spent the last couple of hours searching through the various Tektronix
equipment that we have... I didn't find any Tesla coils.
Though a Google search on the exact phrase "Tesla Coil" got almost 8.1
million hits.
Sadly, I only got 148 hits on the exact phrase "Tektronix 530"
Best regards and best wishes.
Roy






!DSPAM:5e6e76e3248615491685301!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@AuroraGrp.Com | Unix & Windows


locked Re: Tesla Coil help needed

Tony Fleming
 

I understand, but people who are into electronics are also playing around
with "gizmo gadgets" like Tesla Coil.
That is the only reason I've mentioned it to you.
The problem with the Google search is it's limitations and in my case,
probably lack of expert use of Google search engine.
Many TC are there but my "kit" is specific to a design that I do not have.
On my side, I thought you might know someone or even yourself some
information to make this into a functional TC.
Have a great Sunday my friend.
Tony

On Sun, Mar 15, 2020 at 12:54 AM Roy Thistle <roy.thistle@mail.utoronto.ca>
wrote:

On Sat, Mar 14, 2020 at 09:18 AM, Tony Fleming wrote:


I have a Tesla Coil
Hi Tony:
I spent the last couple of hours searching through the various Tektronix
equipment that we have... I didn't find any Tesla coils.
Though a Google search on the exact phrase "Tesla Coil" got almost 8.1
million hits.
Sadly, I only got 148 hits on the exact phrase "Tektronix 530"
Best regards and best wishes.
Roy




Tesla Coil - help needed

Tony Fleming
 

A new chat has been created:

I have a Tesla Coil kit but I don't have schematics that I can follow. All my parts are mentioned in my video: https://www.youtube.com/watch?v=Mt4y6j-foyY&list=PLv52A7rm-UViZEOlzZfZOB9Gl8cjS3ze5&index=2&t=0s
Or go to https://tonysfun.com/ and click on My Youtube Videos button. You can see more information here, before going to my videos.
I'm not an expert, but I take lots of precautions and use Variac Transformers and Isolation Transformers, among other steps to be safe.
I've built Jacob Ladders from Microwave Transformers and others, like in the video, that is for Neon Lights.....
I've tried for several month to contact people on youtube and other places, but many of them are older videos and I don't even know if the people are still around or using the youtube at all....
The seller mentioned in the video doesn't answer their phone and no option to leave a VM either.

If you know of anyone or any place that can help me with this project, I would appreciate it very much.

View/Join This Chat ( https://groups.io/g/TekScopes/chat/5224 )


Stan Griffiths' Memorial

 

I received this from Stan's daughters Valarie and Tricia:

Dear friends and family,
We are deeply grateful to all of you for all your expressions of sympathy,
and offers of support since Dad passed at the end of January, and we know
everyone is very interested in knowing our plans for a memorial gathering.
We regret to say that, due to Corona Virus concerns, we believe having any
kind of gathering in the near future might be hazardous to certain family
members' and dear elders health. The last thing we want to do is celebrate
the life and legacy of our father, and create a situation where we are
compelled to mourn others.
If you want to remember our father in some way during this time, please do
it by donating a little money to a reputable charity, like the ones listed
here: The American Diabetes Association, The Arthritis Foundation, The
American Heart Association, or the Bonnie Hays Small Animal Shelter. Dad
was an insulin dependent diabetic, a cancer and stroke survivor, and had
multiple heart procedures done in the last couple of decades, so any
assistance that can be given to support research into treatments, or meeting
the needs of low income sufferers of these illnesses, would be a fitting
tribute at this time.
We will make plans to gather and remember, and try to have a firm date by
the end of May, when we are truly past the current health crisis. We are
being cautious, perhaps overly so, but we deeply love our parents' surviving
siblings, so forgive us for clinging a bit.
We hope everyone in your circles continues in good health, recovers from any
illnesses quickly and without complication, and we will communicate our
plans to you as soon as we are able.
In gratitude,
Valarie and Tricia


Re: 2430A oscilloscope error code 4000

Szabolcs Szigeti
 

Hi,

There was a change sometime, when Tek changed from external battery to
internal, built into the nvram.
It is actully quite easy to patch en external battery into it. See my
earlier post on this: https://groups.io/g/TekScopes/message/136993

Szabolcs

Gary Robert Bosworth <grbosworth@gmail.com> ezt írta (időpont: 2020. márc.
15., Vas 3:02):

I have a Tek 2430A oscilloscope. Upon boot-up, it gives me an error code
4000 which is for the Front Panel. It says to check in the Service Manual
for the cause, but the Service Manual does not give a reason for this
error. I suspect that this error is common, and I wonder if any other
users have seen this before and know what causes it. If I press Menu Off,
and then press Auto Setup, then the scope functions perfect in every way
and is completely usable. It is interesting to note that this model never
had a backup battery, and there is a bus wire soldered in its place from
the factory.




Re: Another 465B Back In Service

Abc Xyz
 

Terrific! Now you can Fix mine! lol

On Sat, Mar 14, 2020, 11:29 PM Don N3DEB via Groups.Io <dbawatsonville=
yahoo.com@groups.io> wrote:

Had a backup 465B taken out of service sitting on my hobbyist repair bench
for about a year - long journey (hopefully) ended.

Symptom was losing trace after warm up, power supply folded over. The
folder over at first was after a few minutes, gradually occurring almost
immediately. While that seems like an easy fix based on all the group
discussion, it was not because of some cascading failures. I replaced the
power supply caps while I was at it.

All told I replaced quite an assortment of failed parts to get the trace
back that included voltage regulation components. I lost my patience
searching for the intermittent tantalum and injected DC slowly until I got
the expected but unnerving "Pop" and column of smoke. Replaced the roasted
peanut and got my trace back.

Next replaced the rest of the tantalums and the trace sharpened and other
performance issues corrected.

I often use the somewhat controversial "IBM service practice" of just
clipping out the component and soldering the replacement to the remaining
leads. I did not want to remove any boards, nor cause any new faults by
introducing a bad solder joint that could not be located by flipping the
board over. I don't have the confidence nor inclination to install and
potentially diagnose a bag of tantalums soldered in that were viewed from
only one side of the boards. A newbie can mange this type of repair.

I would like to thank the group, as I would never have attempted scope
repairs without the information here.

I would also encourage anyone new to this to jump in, read the service
manual (did I say yet "read the service manual"), patiently follow service
steps, then ask for help.





Another 465B Back In Service

Don N3DEB
 

Had a backup 465B taken out of service sitting on my hobbyist repair bench for about a year - long journey (hopefully) ended.

Symptom was losing trace after warm up, power supply folded over. The folder over at first was after a few minutes, gradually occurring almost immediately. While that seems like an easy fix based on all the group discussion, it was not because of some cascading failures. I replaced the power supply caps while I was at it.

All told I replaced quite an assortment of failed parts to get the trace back that included voltage regulation components. I lost my patience searching for the intermittent tantalum and injected DC slowly until I got the expected but unnerving "Pop" and column of smoke. Replaced the roasted peanut and got my trace back.

Next replaced the rest of the tantalums and the trace sharpened and other performance issues corrected.

I often use the somewhat controversial "IBM service practice" of just clipping out the component and soldering the replacement to the remaining leads. I did not want to remove any boards, nor cause any new faults by introducing a bad solder joint that could not be located by flipping the board over. I don't have the confidence nor inclination to install and potentially diagnose a bag of tantalums soldered in that were viewed from only one side of the boards. A newbie can mange this type of repair.

I would like to thank the group, as I would never have attempted scope repairs without the information here.

I would also encourage anyone new to this to jump in, read the service manual (did I say yet "read the service manual"), patiently follow service steps, then ask for help.


locked Re: Tesla Coil help needed

Roy Thistle
 

On Sat, Mar 14, 2020 at 09:18 AM, Tony Fleming wrote:


I have a Tesla Coil
Hi Tony:
I spent the last couple of hours searching through the various Tektronix equipment that we have... I didn't find any Tesla coils.
Though a Google search on the exact phrase "Tesla Coil" got almost 8.1 million hits.
Sadly, I only got 148 hits on the exact phrase "Tektronix 530"
Best regards and best wishes.
Roy


Re: 2430A oscilloscope error code 4000

Dewey Wyatt
 

When you get the code 4000 what is passing and what is failing?Below the
code it throughs you get a pass and fail on error checks.

On Sat, Mar 14, 2020, 10:02 PM Gary Robert Bosworth <grbosworth@gmail.com>
wrote:

I have a Tek 2430A oscilloscope. Upon boot-up, it gives me an error code
4000 which is for the Front Panel. It says to check in the Service Manual
for the cause, but the Service Manual does not give a reason for this
error. I suspect that this error is common, and I wonder if any other
users have seen this before and know what causes it. If I press Menu Off,
and then press Auto Setup, then the scope functions perfect in every way
and is completely usable. It is interesting to note that this model never
had a backup battery, and there is a bus wire soldered in its place from
the factory.




Re: recommended ESR meters these days

 

Hi John,

I enjoyed reading your post. I share your likeness for your Universal AVOmeter. I constantly use something less sophisticated : an not-too-old Radio Shack multimeter with a mirror backed needle that I also resuscitated after putting it aside for decades. I like to see a needle moving instead of the flickering numbers of a modern autoranging meter. And yes, I also had damage from the battery used in the ohms reading, which was left in the instrument for 20 years...

Harvey said: "Time vs. money is a tradeoff everyone makes". This is true, but participants in this TekScopes group we are not big followers of this tradeoff. Otherwise we would not care for old Tektronix equipment but would retire them all and buy very inexpensive modern electronic instruments with much superior performances. We are here because we have the time, and we don't care much about money.

The time invested here gives us SATISFACTION. It is like putting the time to learn to play a Beethoven sonata on an old piano instead of going to Youtube and listen to it performed in the Carnegie Hall.

Regards,
Ernesto


Re: 2430A oscilloscope error code 4000

Dewey Wyatt
 

The 4430a has a battery in side the dallas  ram chip. If it goes out you loose all the cal info stored there. Then its recal time with a new chip. I made a backup once it was recalibrated and now mine are in zif sockets.

Sent from Mail ( https://go.microsoft.com/fwlink/?LinkId=550986 ) for Windows 10

*From:* Gary Robert Bosworth ( grbosworth@gmail.com )
*Sent:* Saturday, March 14, 2020 10:02 PM
*To:* TekScopes@groups.io
*Subject:* [TekScopes] 2430A oscilloscope error code 4000

I have a Tek 2430A oscilloscope.  Upon boot-up, it gives me an error code 4000 which is for the Front Panel.  It says to check in the Service Manual for the cause, but the Service Manual does not give a reason for this error.  I suspect that this error is common, and I wonder if any other users have seen this before and know what causes it.  If I press Menu Off, and then press Auto Setup, then the scope functions perfect in every way and is completely usable.  It is interesting to note that this model never had a backup battery, and there is a bus wire soldered in its place from the factory.

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Re: recommended ESR meters these days

John Crighton
 

Hello Ernesto, Harvey and the Group,

my initial interest in this thread is due to having a Tektronix
TDS 320 with a dud switchmode style power supply.
Tektronix or the power supply maker do not supply a
circuit diagram.
I am an old guy, a hobbyist and retired. I lean towards
Ernesto's methods. I like this 99 cent ESR Test Adapter.
https://www.yumpu.com/la/document/view/18546928/print-99-cent-esr-test-adapter

I take your point Harvey when you said,
" Time vs money is a tradeoff everyone makes."
You are right.

This thread has made me think about that.
If you are cashed up and might not be around much longer
then enjoy yourself. Buy some nice gear. Why not?

I live 35 Km north of Sydney. I have not been able to buy
a box of tissues or a toilet roll from my local supermarket
for over a weak due to people panic buying in fear of the
corona virus. I am mentioning this because I am using tissues
and bog roll paper to clean up the mess made by a leaking
Energiser 1.5V D cell.
Many of the components on the inside of my beloved
AVO Model 8 mk2 multimeter are green with corrosion.

In the 1960s I hankered after this meter. Here is picture
http://www.richardsradios.co.uk/avo8.html

I finally got my 1960s AVO meter in the 1990s and today
it still works but is suffering from leaking battery damage
due to my negligence.

The Trade Off Harvey, do I save my toilet tissue paper for
toilet use or use it on my 50 plus years old multimeter?

Still on the "Trade Off" theme, up till now, I have spent
over 15 hours cleaning the components on the inside of my
multimeter meter with more work to do.
Common sense tells me it is not worth it but I feel I must
reduce the corrosion damage and fix this meter.
Maybe also as a punishment for not checking the
batteries in my equipment.

Your points Harvey, Ernesto and Dave who wants to
"buy" an ESR meter because he is running out of time,
have made me think about time and how I spend it.

Excellent Thread, thanks for that.

Regards,
John Crighton
Sydney

----- Original Message -----
From: "Harvey White" <madyn@dragonworks.info>
To: <TekScopes@groups.io>
Sent: Sunday, March 15, 2020 10:14 AM
Subject: Re: [TekScopes] recommended ESR meters these days


There's a tradeoff here.

When I was (very) much younger, I built things from whatever I could get from old TV sets, a source of which (non functioning) I was lucky enough to find. I traded off time stripping the old TVs for parts I did not have the money to buy. And yes, there was a store near me that likely had every part I needed. I couldn't get there, and I didn't have the money.

When I had a steady job, some years after I'd gotten out of college, I had a better lab, a few more parts, some more ambitious designs, and I'd started gathering parts from the local university or the throwaways from the business where I worked. Most of my money went into infrastructure, such as better test equipment and a unimat lathe. (You try making holes in a plate of aluminum for mounting a C mount camera lens (used epoxy and a nut from a light assembly (1-20 thread, Imperial), and grinding cone to make the hole.)

Once I got enough money, and the like, I started buying things where the things that I wanted were easier to buy, without having to invent the infrastructure, make the case, make the PC board, design it, debug it, and THEN continue with what I wanted to do when I decided I needed one of those.

Different people have different resources at differing times of their lives. Some are lucky, some not. Some are lucky enough to build everything, some need more.

As far as ESR is concerned, I do have a Sprague LC75, and an HP 4262A, both of which work. I've been lucky.

Time vs money is a tradeoff everyone makes.

Harvey


On 3/14/2020 11:35 AM, Ernesto wrote:
LOL! You people have to spend one hundred dollars in gadgets like the DE-5000 to measure ESR?

As a professional electrical engineer with large experience in the design and development of complex electronic hardware and firmware, I enjoy the use of my ONE RESISTOR ESR meter (see my previous post).

I measured (for fun) in 10 minutes the ESR of about 10 electrolytic capacitors mounted on a dual preamplifier board that is over 40 years old.

- I clipped the ground of the oscilloscope X1 probe on the negative of the electrolytic, and the probe on its positive.
- I clipped to the ONE RESISTOR of 1000 ohm a 10V positive 100Khz signal from my function generator (with the same ground as the oscilloscope), and touched with the other lead of the resistor the positive of the capacitor under test. The resistor became in fact a current source.
- I observed on the oscilloscope, set to 10 mV/div, the 100Khz signal in the equivalent scale of 1 ohm ESR per division. I found some good capacitors and many bad ones! (its amazing how well an amplifier can work even with some "bad" electrolytics...)

It could not be easier!

Ernesto



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