Date   

Re: I've been hacked

Roy Thistle
 

On Thu, Mar 12, 2020 at 10:21 AM, Glydeck wrote:


I know there are tactics and methods employed by law enforcement that many of
us do not know about.
I'd say... there are tactics and methods (including repurposed military software) that law enforcement doesn't know about.
Fortunately, 99% of "viruses, worms, trojans, rootkits, key monitors, ... or any malware) is weakly implemented, and often requires a lot of phising, on the part of the perpetrators to activate. They are fairly easily cleaned out... or reinstalled over.
The other 1% of this malware is the devil's work.
It's well known, most of those guys, doing that work, are part of very liberally funded militaries. If these type want in... they are getting in. Fortunately yet again... they mostly and largely are not interest in the "average guy"... at least, where most of us live.
The only way to mostly avoid it all is to go off grid (no Internet, no phone, no computer) I know individuals... yes some are cranks, or have issues... but: others are highly technically competent, and highly educated individuals. They choose not to be connected... at all.
Roy.


Re: recommended ESR meters these days

Greg Muir
 

The Peak products are all very good. I made up a field kit containing several Peak meters of various flavors. They are not quite lab grade but are very close to comparing with regards to accuracy. And they are simple to operate.

https://www.peakelec.co.uk/acatalog/esr70-capacitor-esr-meter.html

Greg


Re: recommended ESR meters these days

Ken Eckert
 

Personally I like the Sencore LC-77, LC102 or LC103. Very little difference
between a LC-77 and a LC-102

On Thu, Mar 12, 2020 at 2:57 PM ArtekManuals <manuals@...>
wrote:

Took out my (apparently not so) trusty ESR meter the other day and it
eyes had rolled back in its head and no amount of CPR would revive it..
Anyone bought one _*RECENTLY *_that they can recommend or warn me away
from?

Dave
manuals@...

--
Dave
Manuals@...
www.ArtekManuals.com


--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus





Re: recommended ESR meters these days

toby@...
 

On 2020-03-12 5:57 PM, ArtekManuals wrote:
Took out my (apparently not so) trusty ESR meter the other day and it
eyes had rolled back in its head and no amount of CPR would revive it..
Anyone bought one _*RECENTLY *_that they can recommend or warn me away
from?
I have been using this one. Seems to work well for LCR + ESR.

http://lcr.is-best.net/en/?i=1

No affiliation, just satisfied customer.

--Toby


Dave
manuals@...


Re: recommended ESR meters these days

toby@...
 

On 2020-03-12 5:57 PM, ArtekManuals wrote:
Took out my (apparently not so) trusty ESR meter the other day and it
eyes had rolled back in its head and no amount of CPR would revive it..
Anyone bought one _*RECENTLY *_that they can recommend or warn me away
from?
I have been using this one. Seems to work well for LCR + ESR.

http://lcr.is-best.net/en/?i=1

No affiliation, just satisfied customer.

--Toby


Dave
manuals@...


Re: Surprise revival of broken component of old tek scope

Edward Prest
 

Yeah, and sometimes you just have to take it apart - when able. Look in my pictures of a truly dirty pot that, after cleaning with IPA and lube - now works perfectly (dirty intensity pot in edward prest pictures). unbelievable crud..


Tek video: A Precision CRT (1955)

toby@...
 

Maybe ebay shippers would pack CRTs more carefully if they realised that
nobody makes them like this any more:

https://www.youtube.com/watch?v=q5dhfhMItQc&feature=youtu.be

Like other Tektronix manufacture videos (PCBs etc), a window into a lost
world of manufacturing.

--Toby


Re: recommended ESR meters these days

Mike D
 

I have the Peak and the DER, both work great. The DER has a lot more
functionality for the money, but the Peak is UK made and much better
construction.

Mike kd5rjz

On Thu, Mar 12, 2020, 5:10 PM Dale Chayes <dale@...> wrote:

Happy with my (few years old 2018 as I recall)
Keysight/Agilent/whateverthisweek U1731

Not inexpensive but not cheap.

Probably overkill for many.

-Dale



On Mar 12, 2020, at 15:57 , ArtekManuals <manuals@...>
wrote:

Took out my (apparently not so) trusty ESR meter the other day and it
eyes had rolled back in its head and no amount of CPR would revive it..
Anyone bought one _*RECENTLY *_that they can recommend or warn me away from?

Dave
manuals@...

--
Dave
Manuals@...
www.ArtekManuals.com


--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus







Re: recommended ESR meters these days

Dale Chayes
 

Happy with my (few years old 2018 as I recall) Keysight/Agilent/whateverthisweek U1731

Not inexpensive but not cheap.

Probably overkill for many.

-Dale

On Mar 12, 2020, at 15:57 , ArtekManuals <manuals@...> wrote:

Took out my (apparently not so) trusty ESR meter the other day and it eyes had rolled back in its head and no amount of CPR would revive it.. Anyone bought one _*RECENTLY *_that they can recommend or warn me away from?

Dave
manuals@...

--
Dave
Manuals@...
www.ArtekManuals.com


--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus




Re: recommended ESR meters these days

Bill Sudbrink
 

+1 on the Peak.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of magnustoelle via Groups.Io
Sent: Thursday, March 12, 2020 6:03 PM
To: TekScopes@groups.io; TekScopes2@groups.io
Subject: Re: [TekScopes] recommended ESR meters these days

Good Day Dave,
I am using this one from Peak Elektronic Design in the UK for several years now. Very reliable, small, easy to use and it discharges caps safely also:
https://www.peakelec.co.uk/acatalog/esr70-capacitor-esr-meter.html

Cheers,
Magnus

Took out my (apparently not so) trusty ESR meter the other day and it
eyes had rolled back in its head and no amount of CPR would revive it..
Anyone bought one _*RECENTLY *_that they can recommend or warn me away from?

Dave
manuals@...

--
Dave
Manuals@...
www.ArtekManuals.com


--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus


Re: recommended ESR meters these days

magnustoelle
 

Good Day Dave,
I am using this one from Peak Elektronic Design in the UK for several years now. Very reliable, small, easy to use and it discharges caps safely also:
https://www.peakelec.co.uk/acatalog/esr70-capacitor-esr-meter.html 

Cheers,
Magnus 

Took out my (apparently not so) trusty ESR meter the other day and it
eyes had rolled back in its head and no amount of CPR would revive it..
Anyone bought one _*RECENTLY *_that they can recommend or warn me away from?

Dave
manuals@...

--
Dave
Manuals@...
www.ArtekManuals.com


--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus


Re: recommended ESR meters these days

David Holland
 

The DER DE-5000 appears to be still available:

https://www.amazon.com/5000-Handheld-LCR-Meter-accessories/dp/B00S298KJO

Mine isn't recent purchase (2017) but as far as I know, they're some of the
better LCR (and by proxy ESR) meters...

David


On Thu, Mar 12, 2020 at 5:57 PM ArtekManuals <manuals@...>
wrote:

Took out my (apparently not so) trusty ESR meter the other day and it
eyes had rolled back in its head and no amount of CPR would revive it..
Anyone bought one _*RECENTLY *_that they can recommend or warn me away
from?

Dave
manuals@...

--
Dave
Manuals@...
www.ArtekManuals.com


--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus





recommended ESR meters these days

ArtekManuals
 

Took out my (apparently not so) trusty ESR meter the other day and it eyes had rolled back in its head and no amount of CPR would revive it.. Anyone bought one _*RECENTLY *_that they can recommend or warn me away from?

Dave
manuals@...

--
Dave
Manuals@...
www.ArtekManuals.com


--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus


Re: Viewing hoods for 7000 series

David Slipper
 

The 744 can save the screen to a floppy for transfer to a PC (or can be printed via the HPIB bus) - so that is not necessary.
I may just put the camera on fleabay - my brother has just said that film may be available as a special order.

Dave

On 12/03/2020 19:44, Harvey White wrote:
Look into putting a webcam, or an inexpensive point & shoot, or a mount
for a digital camera in place of the back.  I've got the possibility of
doing that as a future project.

Harvey


On 3/12/2020 2:05 PM, David Slipper wrote:
Wow - I've been looking for one - I'll cobble one together for my
TDS744A !!

A friend gave me a (NON-TEK) camera that you cannot get film for now
and I was looking to strip it down to a visor. but this is a much
better solution.

Dave


On 12/03/2020 16:57, John Ferguson via Groups.Io wrote:
Michael, These are very nice.  and SUBSTANTIAL.

thanks much for posting the STL's. I thnk I'll make one for the 2445b I
use the most.

best regards,

John Ferguson

On 3/12/20 12:11 PM, Mlynch001 wrote:
Robin,

I use the name "mlynch002".

The visors are at this link:
<https://www.thingiverse.com/thing:4216121>

Feel free to ask questions as needed.

These may or may not be what people want, they work well for my
purposes.  I am sure that someone can and will modify these to be
more useful and suitable for their individual needs.

These are Creative Commons License for Non-Commercial use only.

.

.


Re: 454, Amplitude Decline

J. Hemetsberger
 

Bob, thank you for your help.
Good idea, I didn't think of a constant magnetic field.
The instrument is definitely in its original condition and foreign bodies would not remain unseen. Do you think the mu-metal shield itself could have been magnetized?
However, I tried to influence the beam with a stack of permanent magnets (neodymium), but the deflection achieved was rather small.
Johann

-----Ursprüngliche Nachricht-----
Von: TekScopes@groups.io [mailto:TekScopes@groups.io] Im Auftrag von Bob Albert via Groups.Io
Gesendet: Mittwoch, 11. März 2020 21:05
An: tekscopes@groups.io; TekScopes@groups.io
Betreff: Re: [TekScopes] 454, Amplitude Decline

Perhaps some stray magnetic material has found its way into the unit. Maybe degaussing would help.
Bob

On Wednesday, March 11, 2020, 12:15:49 PM PDT, J. Hemetsberger <attergau@...> wrote:

Hi Tek group members!

I am a member of the hp group for years, but recently I registered at
TekScopes too. During the last year I repaired two 465's and now I have a
454 on the bench. Trigger and Vertical Switching are working again, but
there is a slight decline in the amplitude from left to right. It is not a
barrel distortion, because it is not symmetric to the vertical center. From
my understanding it has to do with the tube geometry but not with the
Vertical Output Amplifier because the effect is completely independent of
the time base setting.

A strait line (vertically centered & no signal applied) proceeds absolutely
along the horizontal grid center, but if shifted to the top the line bows
down by about 1/10 (to 2/10) Div. Inverse effect appears if the line is
shifted to the bottom, then it bows up.

Certainly the effect could be explained by vertical deflector plates
diverging from left to right due a strong mechanical shock, but that seems
unlikely to me.

The effect is rather weak but still a bit annoying. Unfortunately I did not
find anything suitable in the Service Manual.

Perhaps the deficiency could be fixed by adjustment. Thanks for any
suggestions.

Johann


Surprise revival of broken component of old tek scope

 

While I was reconditioning my old 547 oscilloscope I also paid attention to the CA tool module which came with it.

One of the CA problems was with the variable gain adjusting potentiometers, concentric with the scale selector switch. They were totally intermittent and worthless. So I shorted them out, to have the nominal gain, and I was able to find a replacement on ebay, "unused", that came all the way from Grece. I bought one, since it was sufficient for me to have just one of the two channels with adjustable gain.

All happy when it arrived, it was indeed unused, still in the original Tektronix bag. But it checked dead on arrival. Not 770 ohm, but infinite ohm
Ready to returned it, I did the formalities and notified the seller. The seller responded that this happens with very old potentiometers, and his recommendation was to spray some contact cleaner inside. Inside? this small pot is practically sealed, has just two terminals, with 360 deg. rotation... But I followed the advice and sprayed the contact cleaner. Indeed, the part started to work correctly. But a while later, maybe as soon as the contact cleaner had evaporated, it went back to open circuit. I repeated it several times, with many rotations, until it became more stable and it "kind of" worked.

I replaced with it the pot in channel 1, and also injected contact cleaner in the one on channel 2, which eventually improved somewhat.

Yesterday I was sitting at my desk seeing the old potentiometer of channel 1 that I was ready to throw away. It is a small all plastic part with a continuous plastic back cover (which was cracked) and a contact around the center of it.
Following my habit of never throwing away a broken part or device without trying to open it up to see what is inside and how it works, I took a utility knife and carefully try to separate the plastic cover/body, which gave away without breaking.
To my surprise, I realize that this 770 ohm pot... is WIRE WOUND, with excellent construction, with the rotating wiper making spring contact with the little metal surface of the connector at the center back. Nothing was broken in it, so I sprayed and cleaned it thoroughly, and then pressed the plastic body back on the main part. Now it works like new! And I am getting ready to replace it in channel 1 and do the same with the pot in channel 2.

Never again will I discard an old potentiometer without trying to repair it. This beats the trouble of looking to a new identical one or a substitute!

Meanwhile, my reconditioned 547 with the internal blower cooling the HV transformer is working like a champ! It did its first noble service helping me troubleshoot a pricey DVD player that had quit years ago. The problem was with the power supply, a flyback converter type that makes it essential to look at waveforms.


Re: Viewing hoods for 7000 series

Harvey White
 

Look into putting a webcam, or an inexpensive point & shoot, or a mount for a digital camera in place of the back.  I've got the possibility of doing that as a future project.

Harvey

On 3/12/2020 2:05 PM, David Slipper wrote:
Wow - I've been looking for one - I'll cobble one together for my TDS744A !!

A friend gave me a (NON-TEK) camera that you cannot get film for now and I was looking to strip it down to a visor. but this is a much better solution.

Dave


On 12/03/2020 16:57, John Ferguson via Groups.Io wrote:
Michael, These are very nice.  and SUBSTANTIAL.

thanks much for posting the STL's. I thnk I'll make one for the 2445b I
use the most.

best regards,

John Ferguson

On 3/12/20 12:11 PM, Mlynch001 wrote:
Robin,

I use the name "mlynch002".

The visors are at this link: <https://www.thingiverse.com/thing:4216121>

Feel free to ask questions as needed.

These may or may not be what people want, they work well for my purposes.  I am sure that someone can and will modify these to be more useful and suitable for their individual needs.

These are Creative Commons License for Non-Commercial use only.


.


Re: Viewing hoods for 7000 series

David Slipper
 

Wow - I've been looking for one - I'll cobble one together for my TDS744A !!

A friend gave me a (NON-TEK) camera that you cannot get film for now and I was looking to strip it down to a visor. but this is a much better solution.

Dave

On 12/03/2020 16:57, John Ferguson via Groups.Io wrote:
Michael, These are very nice.  and SUBSTANTIAL.

thanks much for posting the STL's. I thnk I'll make one for the 2445b I
use the most.

best regards,

John Ferguson

On 3/12/20 12:11 PM, Mlynch001 wrote:
Robin,

I use the name "mlynch002".

The visors are at this link: <https://www.thingiverse.com/thing:4216121>

Feel free to ask questions as needed.

These may or may not be what people want, they work well for my purposes. I am sure that someone can and will modify these to be more useful and suitable for their individual needs.

These are Creative Commons License for Non-Commercial use only.

.


Re: Viewing hoods for 7000 series

Colin Herbert
 

I have an 016-0154-00 7000-series viewing hood which is pretty comprehensive. It would be tricky to measure all of it, but I could measure the part that connects to the scope bezel, if it might be useful. I am guessing that it is probably originally in Imperial measure, but if metric is more adaptable to 3D printing, I can do that, too. Just let me know.

Colin.

Test print the first 5 or 10mm of the model. Just enough to make certain that the model "fits" your bezel before going "all in" on a full print. You may need to scale these up or down slightly to make a perfect fit. I have printed all of these and they work well. I am sure that someone will find changes that need to be made.Let me know how they turn out.

Glad to help out!


--
Michael Lynch
Dardanelle, AR


Re: I've been hacked

Glydeck
 

Chuck,

Thank for sharing this. I know there are tactics and methods employed by law enforcement that many of us do not know about.

That said, I may have some interesting input on this. A close friend of mine is an assistant DA for the county and heads the cyber crime unit. They have worked hand in hand on a number of cases with the FBI. The next time we’re out to dinner with them I’ll ask about ‘special' relationships with Geek Squad or any other services.

To keep this on topic: I’m still trying to sort out my TM501-2 power supply.

George

On Mar 12, 2020, at 5:01 AM, Chuck Harris <cfharris@...> wrote:

A very close friend's cousin came back from Iraq after
he quit the military.

He was imprisoned for child pornography on his laptop
computer after he got back. He didn't put it there, but
rather the very terrorists he was fighting did.

It took a couple of weeks to get out of jail on bail,
and about a year for a judge to rule that you can't be
responsible for stuff on your disk that you can't reach
through ordinary means....

But...

I don't know if Geek Squad was involved, but it wouldn't
surprise me, as he was not a computer expert.

There is no such thing as free. You should know that by
your age.

-Chuck Harris

Abc Xyz wrote:
I'm too old for Porn & too Stupid to Commit Crimes ... so I guess I won't
end up in Jail anytime soon. Free Medical & Dental would be welcome tho!!

On Wed, Mar 11, 2020, 12:09 PM Chuck Harris <cfharris@...> wrote:

Geek Squad "technicians" get paid by the FBI to take
special training courses on finding and identifying
hidden pornography, and illegal documents. They get
paid a bounty for every suspicious thing they turn
in to the FBI.