Date   

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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GREGGIO DONA’ & C.

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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.






Re: TEKTRONIX 491 measuring wifi signals

 

Hi Renée,

I find that the 475 is a very fine instrument. Portable, 200 Mhz, dual channel, dual time base. I used plenty of them years ago at work. A true lab workhorse.

I am not a professional musician but just an amateur. The reason I mentioned pianos is because they share with Tektronix a cult of excellence. I am sure you are familiar with a similar excellence in wind instruments.
Like a Tektronix oscilloscope, a top brand piano is a piece of master craftsmanship and art. Like with Tektronix, there is a culture in the appreciation of the older instruments, as well as admiration in the technology of the new ones.
Like I have an old Tektronix 547, unused in the garage for 40 years until recently restored, I have a Mason & Hamlin grand piano, but being played in my living room. This instrument is a 1915, over 100 years old, which makes it twice as old as the 547. And like the 547 with its beautiful sharp trace, it has a refined full sound that is characteristic of this brand from the golden era of pianos.

Good luck fixing your 2710 spectrum analyzer, the 475 must be a good help with this, except in the Ghz range.
Ernesto


Re: TDS3000B calibration

amirb
 

On Wed, Mar 25, 2020 at 01:29 PM, David C. Partridge wrote:


Why would they say 100Hz to 1MHz if 100Hz to 10MHz would also work?
Maybe because there were none that went to 10MHz at that time - a bit like a
laptop I own whose docs say it will take a maximum of 4GB, but will happily
take 8GB.

David
exactly and also because they simply want you to use a specific equipment for the calibration.

I dont have the other tools, so I cannot do the cal on my 3054B but still I think the 10MHz pulser would work

the important thing is what is the scope trying to measure with that pulser. It is not the BW because <1ns wouldn't cut it (the scope rise time itself is rated <700ps
so the pulser should have been much faster) so maybe it is measuring overshoot (undershoot)? but they didnt specify the overshoot of the pulser...


Re: TDS3000B calibration

 

Why would they say 100Hz to 1MHz if 100Hz to 10MHz would also work?
Maybe because there were none that went to 10MHz at that time - a bit like a laptop I own whose docs say it will take a maximum of 4GB, but will happily take 8GB.

David


Re: TDS3000B calibration

benj3867
 

On Wed, Mar 25, 2020 at 12:43 AM, amirb wrote:


for fast rise pulser, is it possible to use one of Leo Bodnar's? is the
frequency really important?
As far as I know, the Leo Bodnar pulser operates at 10MHz which is way too fast.
The TDS3000B service manual says that the frequency should be in the range of 100Hz to 1MHz. Why would they say 100Hz to 1MHz if 100Hz to 10MHz would also work?

While the Bodnar pulser would have been perfectly fine if you were to manually check the rise time of the scope, it will almost certainly not work in the calibration process which is automatic and during which the user can not adjust anything on the scope.

BTW, a suitable fast rise pulse generator can be easily built at home following the instructions in appendix D of Linear Technology Application Note 47 by Jim Williams (easily found on the web). All you need are 3 resistors, a capacitor, and a 2N2369 transistor. You also need a very low-current 90V power supply, which you can either build using an LT1073 as shown in the same article, or simply get from your friendly local *Bay (about $5 for a "DC-DC 8-32V to 45~390V High Voltage Boost Converter").


Re: TEKTRONIX 491 measuring wifi signals

Renée
 

geez Ernesto, seems along my thoughts---I wonder how many here are/were professional musicians???....myself an upper woodwind specialist, still working.....well not in this current environment....back to making oboe reeds.....and fixing my 2710 that was given to me. I wish it had the tracking gen battery made a mess........however,
I am happy with my 475 (200Mhz) ...although someday a 500Mhz would be nice ( think 7000 main frame or a 485).
Renée

On 3/24/20 9:03 PM, Ernesto wrote:
By the way, this high bandwidth scope I mentioned, the tektronix DPO70000SX, can sample at 200 Giga-samples/sec, with 5 pico-second sample resolution. And the price of this instrument with asynchronous time interleaving, ATI, starts at a mere $315,000.00 I know, it leaves my beloved 547 in the dust! But... I seldom need to measure anything with a 5 pico-second resolution. I enjoy the most with audio signals, ultrasound and signals up to the low RF frequencies.*If someone were to give me one as a present, I would sell it promptly and with the money buy a Fazioli concert grand piano.*