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TekScopes@groups.io Notification <noreply@...>
 

Richard Peterson <saaber1@...> added folder /P6430 Temperature Probe Instruction Manual


The following files have been uploaded to the Files area of the TekScopes@groups.io group.

By: Richard Peterson <saaber1@...>


Re: TDS-540B Repair?

Christopher Maness
 

Thanks, I did not know such a thing existed. Linky?

Chris KQ6UP

On Mon, Jul 12, 2021 at 7:23 AM Stephen Hanselman <kc4sw.io@kc4sw.com> wrote:

Buy the LCD replacement soooo much easier.

Regards,

Stephen Hanselman
Datagate Systems, LLC
On Jul 12, 2021, at 05:13, Christopher Maness <christopher.maness@gmail.com> wrote:

The CRT went intermittent with brightness and vertical spread last week. I put it in my car hopping that a friend of mine would take a look at it. He did not want to bother, so it rode around in my car in the heat. The hot bumpy car ride seems to have fixed it at least temporarily, so it could be something simple like card contacts a little dirty. It also took an ESD hit on channel 1. The channel still works, but is no longer high impedance. Was wondering if there is a good tech in the SoCal area. If not, I am willing to box it up and send it to one based on recommendations.

Thanks,
Chris Maness








Re: What do you do when you get a call from AUSTRALIA

Ananda
 

Dennis,

Glad to hear you are OK. I was silently praying that we will hear from you at some point. Please do take care of yourself. Staying involved should also help you to a great extent. When I feel overwhelmed, I simply go to my "office room" Where I have my work table and start something new or sort out parts, nut and bolts etc. to make me relax. Hey, the time is well spent also!

With best wishes and kind regards.

Ananda


Re: TDS-540B Repair?

Stephen Hanselman
 

Buy the LCD replacement soooo much easier.

Regards,

Stephen Hanselman
Datagate Systems, LLC

On Jul 12, 2021, at 05:13, Christopher Maness <christopher.maness@gmail.com> wrote:

The CRT went intermittent with brightness and vertical spread last week. I put it in my car hopping that a friend of mine would take a look at it. He did not want to bother, so it rode around in my car in the heat. The hot bumpy car ride seems to have fixed it at least temporarily, so it could be something simple like card contacts a little dirty. It also took an ESD hit on channel 1. The channel still works, but is no longer high impedance. Was wondering if there is a good tech in the SoCal area. If not, I am willing to box it up and send it to one based on recommendations.

Thanks,
Chris Maness





Re: Tek 2230, Alternatives to the cursor control pot.

Albert Otten
 

On Sun, Jul 4, 2021 at 05:34 PM, Pitpat wrote:


The point is that I couldn't find any direction on how the original
potentiometer works, from my understanding the dual 10k ohm variable works in
opposition so that there's no "dead zones" caused by the 360 degrees of
rotation but thats all...
Hi Federico,

Any progress so far?
It's true that the pots work in opposite directions. In my 2232 this is achieved by interchanging assignment of 0V and +5V to the terminals. With an ordinary dual pot this would not prevent dead zones to occur simultaneously for both wipers. The trick here is that one wiper is rotated w.r.t. the other. Not over 180 degrees what I expected, but enough to avoid simultaneous dead zones.
When there are no simultaneous dead zones the processor can always determine the direction of knob rotation. I don't see the purpose of opposite directions.

Albert


Re: Looking for an T5611-25 CRT (or -7 or -2)

Keith
 

Hi Bob,

If you really need a 561b CRT, then the TEk part number you would seem to need is 154-0614-00

That’s external graticule, Standard p31 phosphor and Standard B14-38 basing.

Note that the -01, -02 and -03 versions of this 154-0614-xx part number are electrically and physically the same, except P2, P7, and P31 phosphors

Is your CRT ceramic? Can you accept a glass CRT?

If so, there is an electrically equivalent earlier CRT, in glass, the T5032. There are about eleven TEK T5032 part numbers that would appear to me at first glance to work, if the glass vs. ceramic thing doesn’t blow up your world.

See them, here: https://w140.com/tekwiki/wiki/T5032

The first eleven p/n have external graticule. Some phosphors are “better” for you than others.

I see at least one complete 561b on fleabay - being parted out. That’s here, and looks like it might be an external graticule CRT.

https://www.ebay.com/itm/192947024206?_trkparms=ispr%3D1&hash=item2cec89f14e:g:2G0AAOSwqrNgCbE1&amdata=enc%3AAQAGAAACkPYe5NmHp%252B2JMhMi7yxGiTJkPrKr5t53CooMSQt2orsSd3M8ngECaRA0SmyU4KT%252FnoWoOfkiFaIW2SJ8lxc2ql%252Bb5XWyxfgDJaThucyAKkrugV0zON4FNfd7a6vwaJdBMsTZkoiO6Jh%252BlD8lWxl90KMRRKnk4jNtjM8BnNwk%252BQ8z9e0HakfOXn9jQ0JiF7vDVG7opKEeF%252B9efKKpTnfnEwIiBWStepSxEWv%252FuSo8zjqpQPOP%252FaiPxd%252Bvp3y4fSezT8OnjmYWzwfzqXgRHuWqb85h6FzSu5j%252FPPgFbIiq2MFCsHOW4y8YCmJyJJDWBfnpA1SyeuZFtmzLLuVsLStUfvwWEDg9RK%252FT1abwuCxYvr%252BzzCp6cfdWjMh1ph3dnAoJHMGljHdYfO4jjXqsXWHn3e78xK%252B2aPcS18m3Etv7YaQgkbgHej587Al7sJqV0gexCevefT2Rv3DG7VopNJqbaDLxLiLAyeuqFX40vbwwEB8ruYUhwfOwaKc%252FYJ2EMjwI7hQIPbP0NwRlbg9geHHe0mzd6%252FGaKz9gt4NYzPju9tkEU5J9MiAlp8uDRNuZpr2FC3AhzfCcM21HLaOMEmyxnqQSaC3Hf4tGD2SJLIEgJSnrZWTGU9ifzRfbO%252BOXohPymi%252ByJFbvWibs01vmF0od4HHmb6nEA%252B%252BmPEQ%252FRfWFQaKracYWfVBH9jCRL1Bc86%252Bm4T5iKMneKGHsHRBejgLV8XsyrGX0ov8p0tKVPOpxQcRXMWeAk1gdVVKNX7DdwrFM6eS%252BFjYJncYqIFgZTbxH%252Fj3IlRkP2oqyehJf58paouetUd1uCgeciNBQIqsd9ieegBQ7V9A1Oh%252FdT9gqJVk6YqPjp9a8dgeBtyeK7rWZM%252Bt3%7Campid%3APL_CLK%7Cclp%3A2334524

Hope this helps


Re: Calibrate the time base, or horizontal amplifier?

Tom Phillips
 

My understanding is that the frame calibration is to ensure the scope
frames are identically calibrated which you would want if swapping plugins
between frames.


TDS-540B Repair?

Christopher Maness
 

The CRT went intermittent with brightness and vertical spread last week. I put it in my car hopping that a friend of mine would take a look at it. He did not want to bother, so it rode around in my car in the heat. The hot bumpy car ride seems to have fixed it at least temporarily, so it could be something simple like card contacts a little dirty. It also took an ESD hit on channel 1. The channel still works, but is no longer high impedance. Was wondering if there is a good tech in the SoCal area. If not, I am willing to box it up and send it to one based on recommendations.

Thanks,
Chris Maness


Re: Dennis Tillman

 

Yeah, a fall detector is definitely something you should buy if you're
concerned. It doesn't cost so much and it's definitely comforting and
helpful.

On Mon, Jul 12, 2021 at 10:06 AM Tom Gardner <tggzzz@gmail.com> wrote:

On 12/07/21 02:53, Richard R. Pope wrote:
I am up there in years and my body no longer works correctly. I could easily
fall and hurt myself and not be able to call for help!
That's a common problem. Over here there are services where you have button on
your wrist or around your neck, and a box connected to the phone line. If you
press the button it calls a service centre and someone comes to help. My mother
had one for years, and it was a great comfort to ME :)

There are also many other devices available, e.g. those which sense movement in
the building (to verify you are up and about) and accelerometers that detect falls.





Re: Calibrate the time base, or horizontal amplifier?

emissionlabs
 

Thank you for the many inputs.

I am looking for a way to calibrate this 5113 scope without dedicated calibrators. Otherwise it becomes too much for me, just for this one time action. I can use an Agilent 33120A digital controlled oscillator, and a 34301A 6 digit multimeter with build in frequency counte, a stabile DC power supply and an HP pulse generator. Even the build in 100Hz signal calibration signal, derived from the mains is a good time reference.

I can input signals directly on the scope boards if needed, or tap signals there. I understand with a 100MHz scope it can not be done like that. The 5113 is just a low frequency scope, and the equipment I have can do much higher frequency than the scope itself.

Having repaired the HV circuit, it is not possible to say what the HV was before, but it was over 3530V after the repair. So I set it to 3400V, by the book. Changing the HV, from what I know, does change the size of the projected picture on the CRT.

Any good hints before I start are much appreciated.


Re: What do you do when you get a call from AUSTRALIA

 

Hi Dennis,
I'm so glad you were helped by a member who took the time to give you a call - probably at great expense.

I had a bad accident in 2005 that changed my life. Several people I interacted with on another web site where I am a moderator sent me messages, and that helped. What really helped was a two pronged thing. First, some called me as you were called. The best thing was I resumed helping people on that web site. The very best medicine is helping total strangers - or acquaintances with your skill set.

Today I am able to do more, but has severe limitations to deal with. My wife died a year and change ago, but continuing to help people has allowed me to get through all this. Today I have a girlfriend and things are looking pretty good. This would not be possible without the opportunity to lend a hand to my fellow human being. Just know you are appreciated and people care for your well being. You do make a difference in people's lives Dennis.

-Chris


Re: Dennis Tillman

Tom Gardner
 

On 12/07/21 02:53, Richard R. Pope wrote:
I am up there in years and my body no longer works correctly. I could easily fall and hurt myself and not be able to call for help!
That's a common problem. Over here there are services where you have button on your wrist or around your neck, and a box connected to the phone line. If you press the button it calls a service centre and someone comes to help. My mother had one for years, and it was a great comfort to ME :)

There are also many other devices available, e.g. those which sense movement in the building (to verify you are up and about) and accelerometers  that detect falls.


Re: Calibrate the time base, or horizontal amplifier?

Peter H
 

The "official" way is to use a 067-0680-00 calibration plug-in (https://w140.com/tekwiki/wiki/067-0680-00, the 067-0587-xx is the same for the 7000 series) to adjust the mainframe first.
Without one, you could in principle feed a signal in through the amplifier, and adjust its amplitude (as measured on the scope's backplane) to the specified V/div - but you'd have to be really sure you know how to get this right.

The '680 produces a stair-step signal that really helps getting the geometry right, of course a suitably configured arbitrary generator could be substituted.

I would still recommend the '680, maybe you can borrow one from someone on the list.


Re: What do you do when you get a call from AUSTRALIA

Mlynch001
 

Dennis,

So happy to learn that you are doing better. Praying that you can stay out of the spiral that is debilitation depression.

Sincerely,
--
Michael Lynch
Dardanelle, AR


Re: What do you do when you get a call from AUSTRALIA

Tom Lee
 

Dear Dennis,

All of us are relieved and happy to hear from you -- thank you for posting!

As to the Dark Cloud Demon, I recommend more geeking out with your many friends here, to supplement your meds.

-- Cheers,
Tom

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu

On 7/11/2021 21:37, Dennis Tillman W7pF wrote:
Yesterday was a really nice day.
The temperature was perfect, the sun was out.
I was on the deck of our little summer house working on my computer.
In front of me across an inlet of Puget Sound I can see snow covered Mt
Rainer 40 miles away.
Suddenly my cell phone rings.
Annoyed! I pick it up to look at the screen and it says in all capital
letters:
AUSTRALIA
Underneath that seemingly giant word is a strangely formatted phone number.
That strange format could only belong to an international telephone number.

This is exactly what my brain said to me in the next 2 seconds between the
2nd and the 3rd ring.
"Holy Crap!"
"It's a mistake"
"I don't know anyone in Australia"
"It's a robo-call. It must be"
"Wait a minute, nobody makes robo-calls from Australia"
"The number format means it really might be coming from Australia"
"Why would anyone want to call me from Australia"
"It's a new trick by the robo-callers to get people to answer and listen to
their recordings"
"They must have mis-dialed"
"They accidentally sat on their phone and pressed a bunch of numbers at
random"
"I don't know anyone in Australia" (that was the second time my brain said
this to me to make sure I got the point)

Then my brain shut up for a moment while it waited to see what I would do
next.
I realized someone probably went to a lot of trouble to find me. So I
answered.

ARGH! It was someone from TekScopes who was very concerned that I was OK
because I disappeared about 4 weeks ago without a trace. We had a very long
talk about what was going on. I was in a depression and couldn't get out of
it. I was overwhelmed with all the things going on in my life - most of them
it seemed to me were going badly. I have suffered from depression almost my
entire life. Until I was in my late 40s I had no idea this was the case. By
then I spent several years in therapy with several different therapists and
eventually one Psychiatrist I was seeing worked out the right balance of
medications for me to take for the rest of my life to help me avoid falling
into another depression. Depression is a learned behavior and the real
danger about it is that the more it happens to you the easier it is to
become depressed. Once I am in one it is like a trap and I can't get out.

But the phone call and the conversation I had with the caller - he said his
name so fast I didn't have a chance to get it was wonderful. He understood
completely what I was going through. That call made it possible to spend
most of today catching up on my email and facing the world once again. I'm
still a little shaky (mentally) but I think (I hope) I will be on my feet
again (mentally) in a few days.

In the meantime I would like to thank Michael Dunn for covering for me. He
and I both agree I could use help with TekScopes because it beginning to
take up too much of my time (that was one of the things I was not able to
spend enough time on but I didn't know how to fix it).

Give me a few days to get caught up
Dennis Tillman W7pF
Thank you for your concern!!!
That really means a lot to me.
I'm happy to be back!!!
Who was it that called me all the way from Australia. I need to thank them
personally.







Re: What do you do when you get a call from AUSTRALIA

EricJ
 

Dennis, glad you are feeling better, I hope you continue to feel even better. I have been there myself with health issues and getting like things would never get better, so I know how it goes sometimes. The gentleman who rang you up was Chris van Lint. We were all happy to hear from him that you were all right.--EricSent from my Galaxy

-------- Original message --------From: Dennis Tillman W7pF <dennis@ridesoft.com> Date: 7/11/21 11:38 PM (GMT-06:00) To: TekScopes@groups.io Subject: [TekScopes] What do you do when you get a call from AUSTRALIA Yesterday was a really nice day. The temperature was perfect, the sun was out. I was on the deck of our little summer house working on my computer. In front of me across an inlet of Puget Sound I can see snow covered MtRainer 40 miles away. Suddenly my cell phone rings. Annoyed! I pick it up to look at the screen and it says in all capitalletters:    AUSTRALIAUnderneath that seemingly giant word is a strangely formatted phone number.That strange format could only belong to an international telephone number. This is exactly what my brain said to me in the next 2 seconds between the2nd and the 3rd ring."Holy Crap!""It's a mistake""I don't know anyone in Australia""It's a robo-call. It must be""Wait a minute, nobody makes robo-calls from Australia""The number format means it really might be coming from Australia""Why would anyone want to call me from Australia""It's a new trick by the robo-callers to get people to answer and listen totheir recordings" "They must have mis-dialed""They accidentally sat on their phone and pressed a bunch of numbers atrandom" "I don't know anyone in Australia" (that was the second time my brain saidthis to me to make sure I got the point)Then my brain shut up for a moment while it waited to see what I would donext. I realized someone probably went to a lot of trouble to find me. So Ianswered.ARGH! It was someone from TekScopes who was very concerned that I was OKbecause I disappeared about 4 weeks ago without a trace. We had a very longtalk about what was going on. I was in a depression and couldn't get out ofit. I was overwhelmed with all the things going on in my life - most of themit seemed to me were going badly. I have suffered from depression almost myentire life. Until I was in my late 40s I had no idea this was the case. Bythen I spent several years in therapy with several different therapists andeventually one Psychiatrist I was seeing worked out the right balance ofmedications for me to take for the rest of my life to help me avoid fallinginto another depression. Depression is a learned behavior and the realdanger about it is that the more it happens to you the easier it is tobecome depressed. Once I am in one it is like a trap and I can't get out. But the phone call and the conversation I had with the caller - he said hisname so fast I didn't have a chance to get it was wonderful. He understoodcompletely what I was going through. That call made it possible to spendmost of today catching up on my email and facing the world once again. I'mstill a little shaky (mentally) but I think (I hope) I will be on my feetagain (mentally) in a few days.In the meantime I would like to thank Michael Dunn for covering for me. Heand I both agree I could use help with TekScopes because it beginning totake up too much of my time (that was one of the things I was not able tospend enough time on but I didn't know how to fix it).Give me a few days to get caught upDennis Tillman W7pFThank you for your concern!!! That really means a lot to me.I'm happy to be back!!!Who was it that called me all the way from Australia. I need to thank thempersonally.


Re: What do you do when you get a call from AUSTRALIA

 

Dennis,

We are all glad that you are well, aside, of course, from the depression, and we look forward to reading you entertaining entries on the group (this one being no exception, well written and amusing).

Depression is a hell of a thing. It contrives to make you think that the pathological way you feel is entirely justified and rational, and even when you KNOW that you suffer from depression, the lies it tells you are still damn convincing.

Depression is a big part of why I wound up on TekScopes. I too have suffered from it most of my life (ever since adolescence) and it was really getting the better of me about half way through the pandemic lock down. It was keeping me up all night, and in an attempt to deal with the sadness I started digging through my father's effects. Almost the first thing I found was Motorola 6809 single board computer that my father had purchased in the late 70s and used to teach himself about microcomputers. In order to debug this ancient bit of technology, I dragged out my father's oscilloscopes (a 475 and a 2213) and began poking around the CPU bus to see what was what.

Everything was going swimmingly for a few weeks until one day the 475 lost it's horizontal sweep. While researching how to repair the sweep circuit on the 475 I discovered the TekScopes group, and the rest is a tale of almost entirely unalloyed joy. However, I have gone through several bouts of depression since joining he group last year, often coinciding with a failure to repair one or another instrument I have acquired since joining TekScopes. There was one bout that was precipitated by a scope that was destroyed in shipping, and another by my failure to make progress repairing the 7623A. I don't actually believe that the depression is the result of these failures and setbacks, but that it latches onto them and amplifies the feelings of disappointment and inadequacy, and things can rapidly spiral out of control from there.

It's good that you have found medication that works, but I have also found that a little positive human contact works wonders as well. We do appreciate all that you do for this community. I also appreciate your writing, which has a delightful blend of expertise and humor, and look forward to finding each new post by you in the group.

-- Jeff Dutky


Re: RSA 3408 A Real time spectrum analyser

Anil Nediyara
 

Thank you. Will chk the electrolytic caps and back up the hdd image. It has almost all the options enabled, was a demo equipment for the technical sales team of Tektronix here.


Re: What do you do when you get a call from AUSTRALIA

Richard R. Pope
 

Dennis,
GOD Bless you!
rich!

On 7/11/2021 11:37 PM, Dennis Tillman W7pF wrote:
Yesterday was a really nice day.
The temperature was perfect, the sun was out.
I was on the deck of our little summer house working on my computer.
In front of me across an inlet of Puget Sound I can see snow covered Mt
Rainer 40 miles away.
Suddenly my cell phone rings.
Annoyed! I pick it up to look at the screen and it says in all capital
letters:
AUSTRALIA
Underneath that seemingly giant word is a strangely formatted phone number.
That strange format could only belong to an international telephone number.

This is exactly what my brain said to me in the next 2 seconds between the
2nd and the 3rd ring.
"Holy Crap!"
"It's a mistake"
"I don't know anyone in Australia"
"It's a robo-call. It must be"
"Wait a minute, nobody makes robo-calls from Australia"
"The number format means it really might be coming from Australia"
"Why would anyone want to call me from Australia"
"It's a new trick by the robo-callers to get people to answer and listen to
their recordings"
"They must have mis-dialed"
"They accidentally sat on their phone and pressed a bunch of numbers at
random"
"I don't know anyone in Australia" (that was the second time my brain said
this to me to make sure I got the point)

Then my brain shut up for a moment while it waited to see what I would do
next.
I realized someone probably went to a lot of trouble to find me. So I
answered.

ARGH! It was someone from TekScopes who was very concerned that I was OK
because I disappeared about 4 weeks ago without a trace. We had a very long
talk about what was going on. I was in a depression and couldn't get out of
it. I was overwhelmed with all the things going on in my life - most of them
it seemed to me were going badly. I have suffered from depression almost my
entire life. Until I was in my late 40s I had no idea this was the case. By
then I spent several years in therapy with several different therapists and
eventually one Psychiatrist I was seeing worked out the right balance of
medications for me to take for the rest of my life to help me avoid falling
into another depression. Depression is a learned behavior and the real
danger about it is that the more it happens to you the easier it is to
become depressed. Once I am in one it is like a trap and I can't get out.

But the phone call and the conversation I had with the caller - he said his
name so fast I didn't have a chance to get it was wonderful. He understood
completely what I was going through. That call made it possible to spend
most of today catching up on my email and facing the world once again. I'm
still a little shaky (mentally) but I think (I hope) I will be on my feet
again (mentally) in a few days.

In the meantime I would like to thank Michael Dunn for covering for me. He
and I both agree I could use help with TekScopes because it beginning to
take up too much of my time (that was one of the things I was not able to
spend enough time on but I didn't know how to fix it).

Give me a few days to get caught up
Dennis Tillman W7pF
Thank you for your concern!!!
That really means a lot to me.
I'm happy to be back!!!
Who was it that called me all the way from Australia. I need to thank them
personally.








What do you do when you get a call from AUSTRALIA

 

Yesterday was a really nice day.
The temperature was perfect, the sun was out.
I was on the deck of our little summer house working on my computer.
In front of me across an inlet of Puget Sound I can see snow covered Mt
Rainer 40 miles away.

Suddenly my cell phone rings.
Annoyed! I pick it up to look at the screen and it says in all capital
letters:
AUSTRALIA
Underneath that seemingly giant word is a strangely formatted phone number.
That strange format could only belong to an international telephone number.

This is exactly what my brain said to me in the next 2 seconds between the
2nd and the 3rd ring.
"Holy Crap!"
"It's a mistake"
"I don't know anyone in Australia"
"It's a robo-call. It must be"
"Wait a minute, nobody makes robo-calls from Australia"
"The number format means it really might be coming from Australia"
"Why would anyone want to call me from Australia"
"It's a new trick by the robo-callers to get people to answer and listen to
their recordings"
"They must have mis-dialed"
"They accidentally sat on their phone and pressed a bunch of numbers at
random"
"I don't know anyone in Australia" (that was the second time my brain said
this to me to make sure I got the point)

Then my brain shut up for a moment while it waited to see what I would do
next.
I realized someone probably went to a lot of trouble to find me. So I
answered.

ARGH! It was someone from TekScopes who was very concerned that I was OK
because I disappeared about 4 weeks ago without a trace. We had a very long
talk about what was going on. I was in a depression and couldn't get out of
it. I was overwhelmed with all the things going on in my life - most of them
it seemed to me were going badly. I have suffered from depression almost my
entire life. Until I was in my late 40s I had no idea this was the case. By
then I spent several years in therapy with several different therapists and
eventually one Psychiatrist I was seeing worked out the right balance of
medications for me to take for the rest of my life to help me avoid falling
into another depression. Depression is a learned behavior and the real
danger about it is that the more it happens to you the easier it is to
become depressed. Once I am in one it is like a trap and I can't get out.

But the phone call and the conversation I had with the caller - he said his
name so fast I didn't have a chance to get it was wonderful. He understood
completely what I was going through. That call made it possible to spend
most of today catching up on my email and facing the world once again. I'm
still a little shaky (mentally) but I think (I hope) I will be on my feet
again (mentally) in a few days.

In the meantime I would like to thank Michael Dunn for covering for me. He
and I both agree I could use help with TekScopes because it beginning to
take up too much of my time (that was one of the things I was not able to
spend enough time on but I didn't know how to fix it).

Give me a few days to get caught up
Dennis Tillman W7pF
Thank you for your concern!!!
That really means a lot to me.
I'm happy to be back!!!
Who was it that called me all the way from Australia. I need to thank them
personally.

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