Date   

Re: TDS3000B calibration

 

On Thu, Mar 26, 2020 at 03:48 AM, David C. Partridge wrote:


I've never encountered a fast edge calibrator (RT 150pS or so) that did even
1MHz.
Leo Bodnar's (no affiliation) fast pulse generators have 40ps max. rise time and 10 MHz repetition rate. BTW, the repetition rate is completely irrelevant for digital 'scopes.

Raymond


Re: Tek Blue Paint

Roy Morgan
 

Bert,

There has been posted (on another list and a long time ago) a method to repair scratches and bare spots on radios with wrinkle paint.

In summary: you make an impression with rubber mold-making material of an intact section, clean the spot to be repaired, apply a layer of new paint and then gently press the mold onto the spot.

The difficulty in getting black wrinkle paint onto a stripped cabinet prompted the development of that technique.

PS: the Harley Davidson motorcycle dealers were the source of the best black wrinkle paint in spray cans.

My attempt on a whole APR-4 cabinet was a disaster.

The old General Radio panel texture and finish was the most difficult to get right but it could be done.


Roy Morgan
K1LKY Western Mass

The main thing I was trying for here was to touch up some scrapes on my Tek scopes and so far that's not working out


Re: Tek 2710 suddenly won't power up??

Doug Bercich
 

You can start by downloading an operating and service manual from here:

http://w140.com/tekwiki/wiki/2710

I think in general the first thing most people do is open it up and take a look. Next up is checking the power rails.

-d


Re: Tek Blue Paint

Bert Haskins
 

On 3/26/2020 9:17 AM, Harold Foster wrote:
Bert: I like the color of the Bahama Sea - bright.

All: Expanding the topic a bit, but: what are your thoughts on the way (method) to paint? Off the shelf spray paint is convenient but is not always consistent either in color or the consistency of the paint itself. Someone mentioned using a fine knap roller - again, for me at least, that seems tricky - especially for items with holes and/or other topographical features. I've thought about a small airless sprayer (Harbor Freight's version of these have a good reputation) or even a larger air-brush setup and these would give the benefit of custom paint being able to be mixed and used. Then there is the selection of paint type - though expensive, I would think an automotive paint would be an excellent choice providing you could have it mixed in a small enough/affordable volume. I have had a couple of items powder coated locally and I have been *very* happy with the outcome there - and very inexpensive especially if they have the color(s) already in stock. So, thoughts?

Hal
I'm very seldom happy with the results of my painting efforts.

The main thing I was trying for here was to touch up some scrapes on my Tek scopes and so far that's not working out.


Bert


Tek 2710 suddenly won't power up??

Steve Nordahl
 

I have a Tektronix 2710 Spectrum Analyzer that out of the blue suddenly will no longer power up.. Worked yesterday, but not today.. S/N is #B033914

I'm the second owner for many many years.. Never had any problems with it.. Very nice piece of equipment..

Any suggestions?? The fuse in the back of the unit is fine.. Not sure what's going on..

Steve
Nazareth, Pa.


Re: Tek Blue Paint

Paul Amaranth
 

I use one of the cheap HLVP guns from HF; it can be used for latex
or enamel, just has to be thinned properly. It works pretty well.

It's unlikely you'll find someone to mix up less than a gallon of
custom color.

Most auto paints are catalized enamels these days and need hazmat
gear to handle safely. Most of the time I stick with a Sherwin
Williams industrial enamel. One word of warning: if you spray
it outside (which is the smart thing to do if you don't have a
paint booth), it will attract skads of gnats that like to land
in the wet paint where they dissolve. Ugh.

PaulA

On Thu, Mar 26, 2020 at 06:17:36AM -0700, Harold Foster wrote:
Bert: I like the color of the Bahama Sea - bright.

All: Expanding the topic a bit, but: what are your thoughts on the way (method) to paint? Off the shelf spray paint is convenient but is not always consistent either in color or the consistency of the paint itself. Someone mentioned using a fine knap roller - again, for me at least, that seems tricky - especially for items with holes and/or other topographical features. I've thought about a small airless sprayer (Harbor Freight's version of these have a good reputation) or even a larger air-brush setup and these would give the benefit of custom paint being able to be mixed and used. Then there is the selection of paint type - though expensive, I would think an automotive paint would be an excellent choice providing you could have it mixed in a small enough/affordable volume. I have had a couple of items powder coated locally and I have been *very* happy with the outcome there - and very inexpensive especially if they have the color(s) already in stock. So, thoughts?

Hal





!DSPAM:5e7cab80188087073745389!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix & Windows


Re: Tek Blue Paint

Harold Foster
 

Bert: I like the color of the Bahama Sea - bright.

All: Expanding the topic a bit, but: what are your thoughts on the way (method) to paint? Off the shelf spray paint is convenient but is not always consistent either in color or the consistency of the paint itself. Someone mentioned using a fine knap roller - again, for me at least, that seems tricky - especially for items with holes and/or other topographical features. I've thought about a small airless sprayer (Harbor Freight's version of these have a good reputation) or even a larger air-brush setup and these would give the benefit of custom paint being able to be mixed and used. Then there is the selection of paint type - though expensive, I would think an automotive paint would be an excellent choice providing you could have it mixed in a small enough/affordable volume. I have had a couple of items powder coated locally and I have been *very* happy with the outcome there - and very inexpensive especially if they have the color(s) already in stock. So, thoughts?

Hal


Re: TDS3000B calibration

 

On Wed, Mar 25, 2020 at 09:38 PM, benj3867 wrote:


Finally, @amirb, you are confusing calibration with performance verification.
To use some of your words, "you are confusing calibration with adjustment".
Obviously the word Calibration mean different things to different people.
Calibration, at least how we did it at Tek in Europe, was almost always
Performance Verification. There were even two Calibration options for customers
to choose from, PV or Adj, with different prices of course.
In the contract with our major customer it said that if a test was within 70%
of spec no action should be done. If it came out between 70 and 100% of spec
adjustment should be done. If the adjustment failed to return it to less
than 70% or couldn't be done the instrument would still Pass. In either case
it should be noted on the Certificate. And of course if the instrument was
out of spec and couldn't be brought back to within it would Fail the Calibration.

/Håkan


Re: Tek Blue Paint

Harold Foster
 

Bert: I, for one, would very much like to see the photo - I have several Tek scopes that I would like to repaint and having a close, consistent color would help greatly. I'll PM you separately with my email address.

Hal


Re: TDS3000B calibration

 

Hmmm - I'd love one - are you paying? :)

David

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Egge Siert
Sent: 26 March 2020 08:37
To: TekScopes@groups.io
Subject: Re: [TekScopes] TDS3000B calibration

Hi David,

A suggestion:

https://us.flukecal.com/products/electrical-calibration/electrical-calibrators/9500b-oscilloscope-calibrator?quicktabs_product_details=2

By the way the PG503 has < 200ps Risetimes at 250 MHz.

Greetings,

Egge Siert


Re: Tek Blue Paint

Christopher Hilton-Johnson
 

For those in the UK, Tek paint colours can be ordered from

Paints4U,  unit 12,  estate road 8, Grimsby DN31 2TG

phone: 01472 488386

I had them make up 2 spray cans in mid 2014. They were an excelent colour match.

I spoke with them today, and all they need to repeat the magic mixture is my order number from 2014, which is 089339

enjoy

Chris HJ



Re: Trying to bring back a AA501

Piero-Gmail
 

Hi Eric,

I fixed same distortion problem based on freq on a AA5001 replacing the out of specs capacitors on the input board A14:

C1220 to C1225.

Hope this helps.

regards


Re: Trying to bring back a AA501

Piero-Gmail
 

Hi Eric,

I fixed same distortion based on freq problem on a AA5001 replacing the out of spec capacitors on the input board A14:

C1220 to C1225.

Hope this helps.

regards

Il 17/01/2020 04:04, Eric ha scritto:
The real issue is my confidence level going "off script" I am not well versed in subbing a part for a non exact match part. but gaining experience every day. I have some IC's ordered so we will see what happens. The good news is this is a common as dirt NAND gate.

On 1/16/2020 8:55 AM, Rick Bale wrote:
Eric, what is the basic criteria needed to be sure the swapped device will work? From all the steps you’ve taken with this resurrection so far, I think you know how to assess the swap.



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Re: TDS3000B calibration

Egge Siert
 

Hi David,

A suggestion:

https://us.flukecal.com/products/electrical-calibration/electrical-calibrators/9500b-oscilloscope-calibrator?quicktabs_product_details=2

By the way the PG503 has < 200ps Risetimes at 250 MHz.

Greetings,

Egge Siert


Re: Tek Blue Paint

Brendan
 

On Wed, Mar 25, 2020 at 06:20 AM, Bert Haskins wrote:



On 3/23/2020 11:11 PM, Brendan via Groups.Io wrote:
The closest I have been able to come is Bahama Sea by Krylon.
I bought some of this for my 22xx scopes and it is way off, at least for
matching.

- Bert



I have never tried to match anything. I have always painted the entire scope. Yes it does not match when sitting next to another scope. I have quite a few scopes and none of them really match next to one and other. I used it to paint a 7633, 468 and a 453 and they turned out really nice.


TEK 575 and 517 in Tucson

Tom Bowers
 

The only electronic component supplier I know of in Tucson, AZ is Elliott Electronic Supply. They recently opened a surplus store in the other half of their building and today was the first time I had a chance to see what is there. They have a 575 curve tracer and a 517 scope. From the front, they are pretty dirty but don't look damaged as far as I could see. I have no idea what the operating condition might be, or if the internals are even present. But if anyone is interested, you can call them at 520-884-7394. They are open M-F from 8 - 5:30 and Sat 9-3 Arizona time. I am not at all associated with them, just passing this along in case someone is interested. The 575 is priced at $20 and the 517 is priced at $25. I took a picture of the front of each which I can supply if interested, email me at pvhengineering at g mail dot com. Tom Bowers


Re: TDS3000B calibration

 

Not arguing that the technology didn't exist to do that, but the standard calibration kit in the form of the CG551AP, or CG5001 top out at 100kHz for the Fast edge setting.

The PG502 is no way a fast edge pulse generator - it has a rise time of about 1nS. I've never encountered a fast edge calibrator (RT 150pS or so) that did even 1MHz.

David

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of benj3867 via Groups.Io
Sent: 25 March 2020 20:39
To: TekScopes@groups.io
Subject: Re: [TekScopes] TDS3000B calibration

@David, @amirb, sorry to dispel your theories.

First, they did have equipment capable of producing such pulses with repetition rates well beyond 10MHz decades before the TDS3000 series was conceived.
For example, the Tektronix PG502, introduced in 1974, could produce such pulses with repetition rates up to 250MHz, and this is just off the top of my head.
Higher performing pulse generators existed well before the PG502

As for the theory that they simply wanted to use a specific calibration equipment, this also does not hold water since the recommended Wavetek 9500 can produce such pulses with a repetition rate up to 2MHz.

Finally, @amirb, you are confusing calibration with performance verification. The calibration process is not trying to measure rise-time or bandwidth because these cannot be adjusted.

In any case guys, all you need is in the manuals and spec sheets, so you don't need anybody's help, and can easily figure things out yourselves.
Good luck with your efforts!


Re: Tek Blue Paint

Jim Ford
 

Yes, different people see things differently.   That may explain why Dave had two wives! ;)Jim Ford Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: ArtekManuals <manuals@...> Date: 3/25/20 7:32 AM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Tek Blue Paint A couple of points about this comment (which is very valid)1) Paint that is 40 years old versus a shade today will have aged differently  due to underlying formulation aging characteristics, time and UV exposure. A paint job that matches today may not match 10 years from now due to different aging characteristics of the two paints. If your really OCD about paint jobs you should paint the whole thing so that you don't have a mismatch due to differences in aging characteristics2) (both) of my wives were artist and my brother in-law who was a (color blind) engineer for Bausch and Lomb  for 20+years will all tell you that the structure in our eyes are different from person to person and that we do not all see given colors in the same hue. What you may have heard of as "rods and cones" in our eyes for color vision are actually resonant structures not unlike what we are used to thinking about in microwaves . So while a given touch up may look perfect to me to another person it may look like a giant zitHave fun ...me I stopped worrying about the color of things 35 years agoDavemanuals@... 3/25/2020 9:20 AM, Bert Haskins wrote:>> On 3/23/2020 11:11 PM, Brendan via Groups.Io wrote:>> The closest I have been able to come is Bahama Sea by Krylon.>> I bought some of this for my 22xx scopes and it is way off, at least > for matching.>> - Bert>>>>>>>>> >-- DaveManuals@... This email has been checked for viruses by Avast antivirus software.https://www.avast.com/antivirus


Re: TDS3000B calibration

benj3867
 

@David, @amirb, sorry to dispel your theories.

First, they did have equipment capable of producing such pulses with repetition rates well beyond 10MHz decades before the TDS3000 series was conceived.
For example, the Tektronix PG502, introduced in 1974, could produce such pulses with repetition rates up to 250MHz, and this is just off the top of my head.
Higher performing pulse generators existed well before the PG502

As for the theory that they simply wanted to use a specific calibration equipment, this also does not hold water since the recommended Wavetek 9500 can produce such pulses with a repetition rate up to 2MHz.

Finally, @amirb, you are confusing calibration with performance verification. The calibration process is not trying to measure rise-time or bandwidth because these cannot be adjusted.

In any case guys, all you need is in the manuals and spec sheets, so you don't need anybody's help, and can easily figure things out yourselves.
Good luck with your efforts!


Re: Tek Blue Paint

Bert Haskins
 

On 3/25/2020 10:32 AM, ArtekManuals wrote:
A couple of points about this comment (which is very valid)

1) Paint that is 40 years old versus a shade today will have aged differently  due to underlying formulation aging characteristics, time and UV exposure. A paint job that matches today may not match 10 years from now due to different aging characteristics of the two paints. If your really OCD about paint jobs you should paint the whole thing so that you don't have a mismatch due to differences in aging characteristics

2) (both) of my wives were artist and my brother in-law who was a (color blind) engineer for Bausch and Lomb  for 20+years will all tell you that the structure in our eyes are different from person to person and that we do not all see given colors in the same hue. What you may have heard of as "rods and cones" in our eyes for color vision are actually resonant structures not unlike what we are used to thinking about in microwaves . So while a given touch up may look perfect to me to another person it may look like a giant zit

Have fun ...me I stopped worrying about the color of things 35 years ago

Dave
manuals@...



On 3/25/2020 9:20 AM, Bert Haskins wrote:

On 3/23/2020 11:11 PM, Brendan via Groups.Io wrote:
The closest I have been able to come is Bahama Sea by Krylon.
I bought some of this for my 22xx scopes and it is way off, at least for matching.

- Bert
OK. I took a photo that shows a blank panel painted with Krylon Bahama Sea ( $9.65 @ Amazon ) next to a 465M and one of my favorite 2232s.

The panel was painted quite a while ago and was baked in the sun for several days.

Reply with your regular email address and I will reply with the picture attached.

Please ignore the non Tek box.

If you think this is worth posting to the photos section, I can do that later.

Bert

86 and still in the game.