Date   

Re: Has anyone replaced the Graticule lights with LEDs?

Eric
 

I just tested that it does actually but only on the very extreme right of the scope and outside the graticule area there is some very weak excitement of the phosphor. But I was only able to tell in a dark room. I had not previously tested it until now. And you have to slam the control from full to off quickly. My ring magnifier that uses a fluorescent tube actually excites the phosphor more then the leds. Significantly more actually.

Eri

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Ingo Scherer
Sent: Monday, May 24, 2021 11:51 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Has anyone replaced the Graticule lights with LEDs?

Eric, it looks wonderfull.
Does the bright lighting excite any screen luminescence?


7904 vertical/trigger interaction.

Andy Warner
 

Today, I noticed a problem on my 7904 that I've not noticed before.

Running in ALT vertical and ALT horizontal mode, so the right vertical
signal is displayed using the A timebase, and the left vertical signal is
displayed using the B timebase.
The trigger level of the A timebase was modified by the on-screen amplitude
of the left vertical signal - e.g., I needed to tweak the timebase A
trigger level to maintain a good trigger for the right vertical, depending
on the state of the left input. The converse did not seem to be true (e.g.,
trigger level on timebase B seemed stable.)

In most other ways, this 7904 seems fine (the only other annoyance is that
the readout display gets wiggly if any vertical signal goes way off screen.)

I also should swap the two timebases, to see if the problem stays with the
slot or the module, just typing this up made me realize that. I will admit
that I was looking at some other signals when I noticed this problem, so I
wasn't really in debug-the-7904 mode.

I have not re-capped the mainframe yet, although I have recapped some of
the modules.

I plan to make time to pop the sides off and measure the rails to see if I
am within spec or have ripple, but I wanted to ask here if this behaviour
sounds familiar to anyone.
--
Andy


Re: Matching Tek Blue Paint

Keith
 

Hi Ed,
Remember that if a can of some rare color lacquer loses propellant, don’t automatically toss it out. You can always puncture the can and recover the paint into a 1/2 pint paint can. You can then shoot this paint from any standard airbrush or touch up gun. I’ve done it many times...it works fine. Lacquer keeps for decades with no problem in rattle cans...even “dead” rattle cans.

And, Just to be clear, even cheap imported airbrushes and touch up guns from the HF store shoot far better than any rattle can.

Cheers!
Keith
CBG


2465 Blank screen when warm

david
 

Hi Guy's, I need your help again, My 2465 was working fine till I left it on for several days. Then the screen went blank. No display, no Trace, and no Readout visible. When I hold in the beam finder button , the Trace, Readout, and Cursors are visible in center of screen in miniature. Works OK when just turned on cold, but goes blank after a minute or two. When I remove the case and start to troubleshoot , whatever is failing cools down and display starts working again. Real pain in the behind, Any help will be greatly appreciated.
David


2 photos uploaded #photo-notice

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

The following photos have been uploaded to the LED mods for 7000 Scopes album of the TekScopes@groups.io group.

By: Eric <ericsp@...>


Re: Getting calibration equipment calibrated

garp66
 

Of course, primary calibration labs at NIST (US), NPL (UK) and NRC (Canada) all function nicely.

The Canadian NRC Metrology labs may have a faster turn-around time and somewhat of a lower cost( CDN$ to US$ exchange rate ~0.8x) , depending on the
calibrations required, and are fully equivalent to NIST...

https://nrc.canada.ca/en/research-development/research-collaboration/research-centres/metrology-research-centre

fun fun fun !


Re: Has anyone replaced the Graticule lights with LEDs?

Eric
 

Hey Andy I offered to make a short video on it and upload it to you tube. I have 2 different filters on the 7603's one is the ND the other is the clear. I will be uploading some pictures on a 7704A with the Beaverton blue filter as well. These we taken with a cell phone as the 7704 is my office scope. I go in to 3 different lighting conditions Lab lights off, dim, and full on and various intensities to show an idea as to the performance of the LEDs

Shoot me and off list e-mail and I will send you the link.

Eric

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Andy Warner
Sent: Monday, May 24, 2021 7:12 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Has anyone replaced the Graticule lights with LEDs?

Eric, I have to say that the photos you uploaded make me want to swap out the lamps on my 7904.
Normally, I'm a reasonable adherent to "it ain't (that) broke, don't fix it", but your results look stunning.

I am surprised that the dimmer circuitry is good enough without modification, do you observe any reduced useful range of the graticule illumination control ?

On Sun, May 23, 2021 at 9:53 PM Eric <ericsp@gmail.com> wrote:

Led moding a 7000 Series Scope after crawling in to my head from a
year ago.

The LEDs used were Adafruit / 754 Super bright White Leds. Important
notes on these Vforward for the diode being white is 2.5Vdc this is
important later. Led Size is 5mm Clear

Dropping resister – None

Power supply open circuit voltage – 8.1 Vdc at full illumination

LED wiring parallel like the old light bulbs

The lamp illumination is current limited by the scope its self. When
the LEDs are connected and the illumination on FULL the voltage across
the connector in the scope is only 3.2 Vdc this means that the Leds
are only drawing about 40mA each this was verified on a 577. This is
why the leds don’t burn up with no current limiting resister. This is
running the leds at about 2X design spec but after running one like
this off a lab power supply for a few hours it is barely warm to the
touch and has not moved from a round 0.031 mA current draw Amp meter
in the power supply so not the best thing in the word for measurement.

Eric

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Harvey
White
Sent: Sunday, May 23, 2021 6:31 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Has anyone replaced the Graticule lights with
LEDs?

LEDs can be gotten in different dispersions, some, for instance, I
think at 130 degrees. If you have a 3D printer, you might be able to
make a light shroud depending on your needs. If you can do PC boards,
then I could recommend a 3 color LED. How to profitably control it is
another matter. Otherwise, pick a color depending on what you want.

It might get close to an incandescent lamp.

Harvey


On 5/23/2021 5:15 PM, DaveH52 wrote:
In a few days, I'll be disassembling my 2465 again to install a
replacement module for U800. Since it will be totally disassembled,
I'm seriously considering replacing the graticule lamps with red LEDs.
I plan on 'frosting' the tops so the light will be more diffused. It
worked well for the meter on my Kenwood TS-440, except I used white LEDs for that.















--
Andy


Re: Added lots of Hp/Tek spares plus a new category, AC Power to stuff season + Tek blue paint details

Paul Amaranth
 

If S/W was a supplier and you have the color name, they will most
likely be able to look it up. You might also want to check with one of
their industrial branches. I recently had to get some Sunbelt Rentals
green enamel and they had no problem looking it up.

I had a local branch do a color match not knowing about that and
that formula is in the archive somewhere. Most of the time when they
make up something you're stuck with a gallon.

Paul

On Mon, May 24, 2021 at 05:52:27PM -0400, kim.herron@sbcglobal.net wrote:
I have some of that paint and it came from Stan Griffiths.
The paint color is Williamsburg Blue. Stan had that
matched to Tek scopes. I'm not sure if the Williamsburg
Blue is a stock Sherwin Williams color. It could be as I'm
sure that Tek probably got the paint from S/W. I had
them match me the three colors for Collins S-Line paint
That was at a local store here in Grand Rapids MI. They
probably don't have the formula any more as they don't
keep custom formulas for a LONG time. If Stan had that
custom matched, S/W had a policy of not releasing the
formula for the mix to anyone but the customer that
had it made up. Maybe that's changed too. But who
knows. The store where he had it made up would be the
best bet on the formula.



On 24 May 2021 at 14:14, walter shawlee wrote:

We have been busy adding lots of support parts, and lowering the
cost of ones tha thave been sitting a while, . Alos, I had many
requests for more variable AC power supplies and Variacs like the
custom HP unit we had up last month, so we have added a new
category:

https://www.sphere.bc.ca/test/stuffday.html#acpower

I will keep adding items to it as I find them. Let me know if any
more specific requests,

On the Tek blue paint issue, the stuff I use, which is a perfect
match for color and luster is marked as follows:
OMNI-PAK
Master Blend
EZ-Touch

the specific blend label says:
OPEX L61 Lacquer
L61XXL42-4383
Tek Blue
05/05/2011 (when I got mine)
Portland Commercial #4383
to reorder (503) 249-0222

I think several of us got paint at the same time some years ago,
this is all the data to get more, assuming they are still in
business.
it is excellent paint, the match is incredible.
shipping, however, is a total nightmare.

all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.
https://www.sphere.bc.ca/test/index.html




Kim Herron W8ZV
kim.herron@sbcglobal.net
1-616-677-3706



--
Kim Herron
W8ZV
kim dot herron at sbcglobal dot net






!DSPAM:60ac202f96062052012975!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@AuroraGrp.Com | Unix/Linux - We don't do windows


Re: Has anyone replaced the Graticule lights with LEDs?

Andy Warner
 

Eric, I have to say that the photos you uploaded make me want to swap out
the lamps on my 7904.
Normally, I'm a reasonable adherent to "it ain't (that) broke, don't fix
it", but your results look stunning.

I am surprised that the dimmer circuitry is good enough without
modification, do you observe any reduced useful range of the graticule
illumination control ?

On Sun, May 23, 2021 at 9:53 PM Eric <ericsp@gmail.com> wrote:

Led moding a 7000 Series Scope after crawling in to my head from a year
ago.

The LEDs used were Adafruit / 754 Super bright White Leds. Important notes
on these Vforward for the diode being white is 2.5Vdc this is important
later. Led Size is 5mm Clear

Dropping resister – None

Power supply open circuit voltage – 8.1 Vdc at full illumination

LED wiring parallel like the old light bulbs

The lamp illumination is current limited by the scope its self. When the
LEDs are connected and the illumination on FULL the voltage across the
connector in the scope is only 3.2 Vdc this means that the Leds are only
drawing about 40mA each this was verified on a 577. This is why the leds
don’t burn up with no current limiting resister. This is running the leds
at about 2X design spec but after running one like this off a lab power
supply for a few hours it is barely warm to the touch and has not moved
from a round 0.031 mA current draw Amp meter in the power supply so not the
best thing in the word for measurement.

Eric

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Harvey White
Sent: Sunday, May 23, 2021 6:31 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Has anyone replaced the Graticule lights with
LEDs?

LEDs can be gotten in different dispersions, some, for instance, I think
at 130 degrees. If you have a 3D printer, you might be able to make a
light shroud depending on your needs. If you can do PC boards, then I
could recommend a 3 color LED. How to profitably control it is another
matter. Otherwise, pick a color depending on what you want.

It might get close to an incandescent lamp.

Harvey


On 5/23/2021 5:15 PM, DaveH52 wrote:
In a few days, I'll be disassembling my 2465 again to install a
replacement module for U800. Since it will be totally disassembled, I'm
seriously considering replacing the graticule lamps with red LEDs. I plan
on 'frosting' the tops so the light will be more diffused. It worked well
for the meter on my Kenwood TS-440, except I used white LEDs for that.















--
Andy


Re: Getting calibration equipment calibrated

Stephen Hanselman
 

5 standard cells, I think Leeds and Northrop did a set in a very nice Oak box.

Seriously my final standard was a a 3458A with a 3245A, what a set of equipment.

Regards,

Stephen Hanselman
Datagate Systems, LLC

On May 24, 2021, at 14:34, walter shawlee <walter2@sphere.bc.ca> wrote:

I agree, a fluke 515A is an excellent calibrator (if working and calibrated) for any home lab, maybe ditch the batteries, they are nothing but trouble. They show up regularly, but again, the issue is how do you know it's still good, especially if you buy it used? Being defective is the usual reason they get sold. Others have mentioned some very good DC references that can be used to cross-check it that are not expensive, so you can get to the goal line if you are careful. Also, make friends with somebody close by that has a better bit of gear than you do so you can do a quick check or cal if needed. Outside validation is essential.

I use a regularly cal'd Fluke 5100B to do my DMMs and similar items (I had several 515As, but got rid of them for this), plus I cross-check to a cal'd hp 34401A (I just can't afford a 3458A, but it is the magic weapon if you can afford to cal it!). I also built a super stable 10.0000VDC reference I use as a secondary cross-check, along with a selected super stable 10k resistor.

all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.







Re: 7934 option 02 and IKEA

Karin Johnson
 

Ingo:
No unfortunately.

Karin


Re: Added lots of Hp/Tek spares plus a new category, AC Power to stuff season + Tek blue paint details

Dave Daniel
 

Somewhere in the archives is a post that has the particular color formula for Tektronix paint.

DaveD

On May 24, 2021, at 17:52, kim.herron@sbcglobal.net wrote:

I have some of that paint and it came from Stan Griffiths.
The paint color is Williamsburg Blue. Stan had that
matched to Tek scopes. I'm not sure if the Williamsburg
Blue is a stock Sherwin Williams color. It could be as I'm
sure that Tek probably got the paint from S/W. I had
them match me the three colors for Collins S-Line paint
That was at a local store here in Grand Rapids MI. They
probably don't have the formula any more as they don't
keep custom formulas for a LONG time. If Stan had that
custom matched, S/W had a policy of not releasing the
formula for the mix to anyone but the customer that
had it made up. Maybe that's changed too. But who
knows. The store where he had it made up would be the
best bet on the formula.



On 24 May 2021 at 14:14, walter shawlee wrote:

We have been busy adding lots of support parts, and lowering the
cost of ones tha thave been sitting a while, . Alos, I had many
requests for more variable AC power supplies and Variacs like the
custom HP unit we had up last month, so we have added a new
category:

https://www.sphere.bc.ca/test/stuffday.html#acpower

I will keep adding items to it as I find them. Let me know if any
more specific requests,

On the Tek blue paint issue, the stuff I use, which is a perfect
match for color and luster is marked as follows:
OMNI-PAK
Master Blend
EZ-Touch

the specific blend label says:
OPEX L61 Lacquer
L61XXL42-4383
Tek Blue
05/05/2011 (when I got mine)
Portland Commercial #4383
to reorder (503) 249-0222

I think several of us got paint at the same time some years ago,
this is all the data to get more, assuming they are still in
business.
it is excellent paint, the match is incredible.
shipping, however, is a total nightmare.

all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.
https://www.sphere.bc.ca/test/index.html




Kim Herron W8ZV
kim.herron@sbcglobal.net
1-616-677-3706



--
Kim Herron
W8ZV
kim dot herron at sbcglobal dot net





Re: Updated album Mystery 330MHz signal on top of a 3mA pulse from a P6302 - AM503B Combination #photo-notice

Ed (SCSKITS)
 

Dennis:

Have you tried this with a pulse that has a slower rising edge, such as the square wave or pulse out of a function generator?

Does it do the same thing with a falling edge pulse, no 150MHz before followed by 150MHz during and after.

How long does the 150MHz ringing last?

ed


Re: Added lots of Hp/Tek spares plus a new category, AC Power to stuff season + Tek blue paint details

kim.herron@sbcglobal.net
 

I have some of that paint and it came from Stan Griffiths.
The paint color is Williamsburg Blue. Stan had that
matched to Tek scopes. I'm not sure if the Williamsburg
Blue is a stock Sherwin Williams color. It could be as I'm
sure that Tek probably got the paint from S/W. I had
them match me the three colors for Collins S-Line paint
That was at a local store here in Grand Rapids MI. They
probably don't have the formula any more as they don't
keep custom formulas for a LONG time. If Stan had that
custom matched, S/W had a policy of not releasing the
formula for the mix to anyone but the customer that
had it made up. Maybe that's changed too. But who
knows. The store where he had it made up would be the
best bet on the formula.



On 24 May 2021 at 14:14, walter shawlee wrote:

We have been busy adding lots of support parts, and lowering the
cost of ones tha thave been sitting a while, . Alos, I had many
requests for more variable AC power supplies and Variacs like the
custom HP unit we had up last month, so we have added a new
category:

https://www.sphere.bc.ca/test/stuffday.html#acpower

I will keep adding items to it as I find them. Let me know if any
more specific requests,

On the Tek blue paint issue, the stuff I use, which is a perfect
match for color and luster is marked as follows:
OMNI-PAK
Master Blend
EZ-Touch

the specific blend label says:
OPEX L61 Lacquer
L61XXL42-4383
Tek Blue
05/05/2011 (when I got mine)
Portland Commercial #4383
to reorder (503) 249-0222

I think several of us got paint at the same time some years ago,
this is all the data to get more, assuming they are still in
business.
it is excellent paint, the match is incredible.
shipping, however, is a total nightmare.

all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.
https://www.sphere.bc.ca/test/index.html




Kim Herron W8ZV
kim.herron@sbcglobal.net
1-616-677-3706



--
Kim Herron
W8ZV
kim dot herron at sbcglobal dot net


Re: Getting calibration equipment calibrated

 

I agree, a fluke 515A is an excellent calibrator (if working and calibrated) for any home lab, maybe ditch the batteries, they are nothing but trouble. They show up regularly, but again, the issue is how do you know it's still good, especially if you buy it used? Being defective is the usual reason they get sold. Others have mentioned some very good DC references that can be used to cross-check it that are not expensive, so you can get to the goal line if you are careful. Also, make friends with somebody close by that has a better bit of gear than you do so you can do a quick check or cal if needed. Outside validation is essential.

I use a regularly cal'd Fluke 5100B to do my DMMs and similar items (I had several 515As, but got rid of them for this), plus I cross-check to a cal'd hp 34401A (I just can't afford a 3458A, but it is the magic weapon if you can afford to cal it!). I also built a super stable 10.0000VDC reference I use as a secondary cross-check, along with a selected super stable 10k resistor.

all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.


Re: Added lots of Hp/Tek spares plus a new category, AC Power to stuff season + Tek blue paint details

 

The phone number, according to a thread on EEVblog, goes to Sherwin Williams, who are still in business. I'm going to go to a Sherwin Williams store to see if they can get some shipped to the store for pickup, which would, I expect, avoid the vicissitudes of consumer level shipment.


Re: 7934 option 02 and IKEA

Mark Vincent
 

It is always great to hear when someone gets something working again.

Mark


Re: Matching Tek Blue Paint

 

I'm going to go by a Sherwin Williams store and see what they can offer me to match the 308 front cover (the most portable sample of Tek Blue that I have to hand).

What I'd really like is to be able to mix my own in an appropriate lacquer base, and then apply it with an airbrush, but if I can find something off-the-shelf that works (as the samples from Behr and Glidden appear to) I'll be satisfied with that.

I need to do more research on what kinds of paints (as in binder chemistry) are available, and what would be closest to / most appropriate to replace the original Tek paint.

-- Jeff Dutky


Re: Matching Tek Blue Paint

Bert Haskins
 

On 5/24/2021 3:48 PM, Tom Lee wrote:
Hi Jeff,

I also assume that it is a batch date. I just looked at the two cans I have, and there's no such information on those particular samples.

-- Cheers,
Tom
I used this ( Krylon® ColorMaster™ Paint + Primer, Gloss, Bahama Sea, 340g ) on a case for a 2235 and it turned out pretty good.

Not a exact match thou.


Added lots of Hp/Tek spares plus a new category, AC Power to stuff season + Tek blue paint details

 

We have been busy adding lots of support parts, and lowering the cost of ones tha thave been sitting a while, . Alos, I had many requests for more variable AC power supplies and Variacs like the custom HP unit we had up last month, so we have added a new category:

https://www.sphere.bc.ca/test/stuffday.html#acpower

I will keep adding items to it as I find them. Let me know if any more specific requests,

On the Tek blue paint issue, the stuff I use, which is a perfect match for color and luster is marked as follows:
OMNI-PAK
Master Blend
EZ-Touch

the specific blend label says:
OPEX L61 Lacquer
L61XXL42-4383
Tek Blue
05/05/2011 (when I got mine)
Portland Commercial #4383
to reorder (503) 249-0222

I think several of us got paint at the same time some years ago,
this is all the data to get more, assuming they are still in business.
it is excellent paint, the match is incredible.
shipping, however, is a total nightmare.

all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.
https://www.sphere.bc.ca/test/index.html

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