Date   
Re: OT: Win 8.1 and 10?

Siggi
 

On Wed, 10 Feb 2016 at 18:42 Sigurður Ásgeirsson <siggi@...> wrote:

At home, on my ThinkPad T4120 lab machine I'm running Ubuntu 14.04.
Ugh - T420. Damn fat fingers.


[Non-text portions of this message have been removed]

Re: OT: Win 8.1 and 10?

Siggi
 

I've mostly worked on Windows for the past couple of decades doing software
development.
At home, on my ThinkPad T4120 lab machine I'm running Ubuntu 14.04. I have
to say I love Linux as a development environment, and it's not half bad for
a GUI. When you need something for anything it's typically just a quick
search and a "sudo apt-get install foo" away.
You want to run it on well-supported mainstream hardware, though. I tried
it on a 2006-vintage MacBook Pro, where it runs just fine when it runs -
but close the lid on the MacBook and it's a toss-up whether it'll ever wake
up.

I worried initially about software support, but so far I've managed to find
something (free) for everything I want to do. LTSpice runs just fine under
Wine, as a case in point, KiCad is a wonderful (free) schematic capture and
layout package, and FreeCAD works quite well as a (free) CAD program
(though only an engineer would ever love it).

On Wed, 10 Feb 2016 at 07:44 Mark wendt.mark@... [TekScopes] <
TekScopes@...> wrote:



Rich,

What flavors and versions of Linux have you tried? I'm running Ubuntu
14.04 LTS on this laptop, and I have CentOS 7 on another desktop
machine. My CNC machine runs LinuxCNC on Ubuntu 10.04 LTS.

The more modern versions of Linux install a lot easier than the old
ones. And if you don't want to go under the hood, there are enough GUI
admin tools that you probably wouldn't have to ever use a command line.
Though that's what I tend to do since I've been a Unix/Linux sysadmin
for the last 25 or so years.

Mark

On 02/09/2016 08:18 PM, 'Richard R. Pope' mechanic_2@...

[TekScopes] wrote:
Mark and et al,
I want to thank everyone for their inputs and their discussions on
this subject. I have done a lot of reading and I have considered all
that has been said here. I knew that this was the right place to come. I
believe that it is time to stop this thread.
I am going to stay with 8.1 for right now. There is a lot to learn
here. I have also done some playing around with Linux going back more
that a decade. My other machine is triple boot with XP, Server 2003, and
Linux. Something that keeps holding me back on Linux is the learning
curve.
There is something else that I would like to cover. I tried to
install VB6 on this machine and it won't work. Is Visual Studio 11
compatible with Visual Studio 6?
Again thanks for everything,
rich!

On 2/9/2016 7:01 AM, Mark wendt.mark@... [TekScopes] wrote:
Or better yet, upgrade to Linux. ;-)

Mark


[Non-text portions of this message have been removed]

Re: 7904 - Very Dim Trace

Marian B
 

On 10.02.2016 22:18, jimmcintyre22@... [TekScopes] wrote:
1N486A is 225V

1N4937 is 600V


Really? I was thinking they'd be much higher...
These diodes only rectify a [clipped] sample of the AC-HV: They only
need to block about twice the maximum Z axis voltage - approx 80-100 V
(depending on grid bias, tube etc), twice that are ~200 V reverse
voltage, at most.

I think almost all parts in the DC restorer circuits are quite critical
for leakage however. Reverse recovery must be fast enough for a couple
dozen kHz operation. (Which reminds me, I still didn't have the time to
look into the 7603 further :/

Cheers, Marian

Re: TDS 380 calibration and vertical scale problem

Siggi
 

Hey David,

I started with a 2465 that just needed a new power switch. Next was a 2467
that I got with no traces. It took me weeks to find the fault, but that
scope really hooked me. Since then I've accrued a 2430 with terrible
battery corrosion, a TDS684A, TDS784D and a 485. All bought in various
states of disrepair, and all but the 684A are working to spec (I still have
hope for that one).
I've also repaired a bunch of TM500 modules, a Tek power supply, a HP
34401A DMM and on and on. I'm heard put to see any gear on my bench that I
didn't buy broken.
I find it super rewarding to fix these old beauties, and with each repair I
learn something new.
I'm now fixing up a beautiful old HP 8566B and some other RF gear in need
of TLC.

Unfortunately I'm running out of lab space, and somehow I can't bring
myself to sell any of my rescues :).

The TDS380 unfortunately dates to the time where Tek was becoming stingy
with the service docs. I'm sure you'd enjoy the heck out of repairing the
earlier scopes, the older service manuals are just wonderful.
I generally go for mid-eighties to mid-nineties vintage gear, as it tends
to have great docs, and replacement components are generally available.

Siggi

On Wed, Feb 10, 2016, 17:25 david.wilson92@... [TekScopes] <
TekScopes@...> wrote:



Ha, I see. Have you bought a number of scopes from members before like
this? Maybe you seen worse?







[Non-text portions of this message have been removed]

Re: TDS 380 calibration and vertical scale problem

David Wilson
 

Ha, I see. Have you bought a number of scopes from members before like this? Maybe you seen worse?

Re: OT: Win 8.1 and 10?

Richard R. Pope
 

Mitch,
I wasn't able to get VS6 or 11 to run. Even the service packs for 6
wouldn't install. VS13 works and it is a different animal. I have a lot
to learn. I think that I am going to setup a Virtual machine and install
XP on it. Right now I am using a KVM so that I can switch back and forth
between my XP machine and this machine. My old machine wouldn't run 8.1
or Virtual machines.
Most of the software that I am installing works but there are some
programs that won't install and others that won't run after I install
them. My new machine is extremely fast. I would estimate between 4 and 5
times faster. What is funny is that the processor clock speed on this
machine is 1.6GHz and on the old machine it is 2.1GHz. This shows how
much faster the chipset is. How many cores does 8'1 support? My old
machine is a dual processor with two cores per processor. This machine
is also a dual processor but there are six cores per processor. I
appreciate the help and support on this site. It has helped me in more
ways than any of you can know.
Thanks,
rich!

On 2/9/2016 9:31 PM, n4mf_sc@... [TekScopes] wrote:

VS6 ? and VS11 are basically 2 different animals. Code written in 6 ?
will have to be reworked for 11 or 13 or 15 or Community which I am
running now. The coding models and commands have changed greatly over
the years, as has so much more. I had to revamp code 2 times for a
Fire Flow (water needed) calculations program I wrote that started in
QuickBasic and I ported to VS 95 in VB. It's no longer being reworked
but I do have some other items I have been playing around with...

Yes I know how my PC runs "under the hood"....

The installer is getting a out of range response from the OS query and
going to the unknown OS error out.

Mitch
N4MF

VS Community is free. The EULA lays out what you can do with it which
is a bit relaxed from Express. If It's gonna be commercial you will
still need pro or better, The EULA is different.




------------------------------------------------------------------------

Re: 7904 - Very Dim Trace

Jim McIntyre
 

1N486A is 225V

1N4937 is 600V


Really? I was thinking they'd be much higher...

Re: Tek 2215

Jay
 

From: jasontucker70@...


---In TekScopes@..., <tothwolf@...> wrote :

On Fri, 5 Feb 2016, jasontucker70@... mailto:jasontucker70@... [TekScopes] wrote:

> I got chance to work on the scope today .. The power button is stuck on
> position and I have it removed from the pcb with no damage but just a
> little clean up .. I cleaned but I am still trying to a suitable lube
> for the switch unless someone has a suggestion ?? Then I noticed the bnc
> resistors are completely charred on both channels.. Will any resistor
> work or am I better with a precision resistor ?? Should I check any
> other parts if those resistors are shot ??

Are you sure those resistors are bad? The remains of the resistor that was
left attached to the junk front panel that I bought for the plastic bezel
is molded in black plastic.


Yes I know the shot cause the resistor are destroyed and chard the pcb ..
The second 5.6ohm resistors are also out of spec too ..



---In TekScopes@..., <tothwolf@...> wrote :

On Fri, 5 Feb 2016, jasontucker70@... mailto:jasontucker70@... [TekScopes] wrote:

> Also found a couple other resistors out of spec ..How hard is it to
> remove the front and pbc behind it for repair ? Is there anything else
> I should watch out or concerned with when tearing down ???

Removing the front panel is incredibly difficult. I removed the plastic
bezel from one scope because the original was crushed but I did not remove
the aluminum chassis that the board is attached to. I replaced the two
electrolytic capacitors on the front panel board, cleaned, and lubricated
the controls and switches with the board in place. In order to remove the
portion of the aluminum frame that covers the board, you would have to
remove the CRT, the knobs, and the plastic bezel (the screws are behind
the self-stick control panel overlay).

Oh ok and I just wound up just removing knobs and screw and wound up desoldering the bottom pins and just removed the front .. Which wasn't bad since I have a bulb desoldering tool which works pretty good..I am not sure if I want to reuse the original pins again or make new ones from mag wire ..
Side note is it worth it to do the trigger mod while it's already apart ???

http://s87.photobucket.com/user/nucklehead_2006/media/20160207_193323_zpstdmzhss1.jpg.html
http://s87.photobucket.com/user/nucklehead_2006/media/20160207_193335_zps1mergsjp.jpg.html


Preview by Yahoo


Oh with damage should I check any other parts ???

Re: Ebay Rip-off ? - "Global Shipping Program"

David DiGiacomo
 

On Wed, Feb 10, 2016 at 12:24 PM, John Griessen <@jgriessen> wrote:
I'd have to call that a convenience price.
Agreed.

I've not checked since a recent USPS rate increase, but
sending international priority to the UK is reliable, and postage costs about $25 for a flat rate envelope.
It went up to $33 retail.

If yours was a box such as 5 x 9 x 12 inches weighing a kilo, it could go for $26 plus packing costs
according to http://www.nerdylorrin.net/jerry/postages/index.html#1stClassIntlPkgs, maybe $32 total.
That chart is outdated... current postage rate would be $34.50 retail.

Re: 2465BCT Refurbishing

 

The fan always runs when power is on.  Thermal control consists of varying the fan speed. 

From: "2465bct@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Wednesday, February 10, 2016 12:19 PM
Subject: [TekScopes] 2465BCT Refurbishing

  With the last set of part replacements, I now have the 2465BCT working! It
passed the smoke test, and after a few connector glitches, I got everything
reassembled and it passes all diagnostics. Just playing around with the
calibrator signal, everything that I know how to test looks good. I have to
learn how to use all of the features to give it a really good test, but so it
looks great.

I still plan on making some modifications, but I am waiting on parts for most
of those. I am not sure that the fan is working, the case appears fairly warm
but I don't feel any fan exhaust. It may not be warm enough to kick on yet, or
the fan could need replacing or the fan control circuit could be bad. I will
look into that and see what I find.

Mike

#yiv3681148975 #yiv3681148975 -- #yiv3681148975ygrp-mkp {border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;}#yiv3681148975 #yiv3681148975ygrp-mkp hr {border:1px solid #d8d8d8;}#yiv3681148975 #yiv3681148975ygrp-mkp #yiv3681148975hd {color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;}#yiv3681148975 #yiv3681148975ygrp-mkp #yiv3681148975ads {margin-bottom:10px;}#yiv3681148975 #yiv3681148975ygrp-mkp .yiv3681148975ad {padding:0 0;}#yiv3681148975 #yiv3681148975ygrp-mkp .yiv3681148975ad p {margin:0;}#yiv3681148975 #yiv3681148975ygrp-mkp .yiv3681148975ad a {color:#0000ff;text-decoration:none;}#yiv3681148975 #yiv3681148975ygrp-sponsor #yiv3681148975ygrp-lc {font-family:Arial;}#yiv3681148975 #yiv3681148975ygrp-sponsor #yiv3681148975ygrp-lc #yiv3681148975hd {margin:10px 0px;font-weight:700;font-size:78%;line-height:122%;}#yiv3681148975 #yiv3681148975ygrp-sponsor #yiv3681148975ygrp-lc .yiv3681148975ad {margin-bottom:10px;padding:0 0;}#yiv3681148975 #yiv3681148975actions {font-family:Verdana;font-size:11px;padding:10px 0;}#yiv3681148975 #yiv3681148975activity {background-color:#e0ecee;float:left;font-family:Verdana;font-size:10px;padding:10px;}#yiv3681148975 #yiv3681148975activity span {font-weight:700;}#yiv3681148975 #yiv3681148975activity span:first-child {text-transform:uppercase;}#yiv3681148975 #yiv3681148975activity span a {color:#5085b6;text-decoration:none;}#yiv3681148975 #yiv3681148975activity span span {color:#ff7900;}#yiv3681148975 #yiv3681148975activity span .yiv3681148975underline {text-decoration:underline;}#yiv3681148975 .yiv3681148975attach {clear:both;display:table;font-family:Arial;font-size:12px;padding:10px 0;width:400px;}#yiv3681148975 .yiv3681148975attach div a {text-decoration:none;}#yiv3681148975 .yiv3681148975attach img {border:none;padding-right:5px;}#yiv3681148975 .yiv3681148975attach label {display:block;margin-bottom:5px;}#yiv3681148975 .yiv3681148975attach label a {text-decoration:none;}#yiv3681148975 blockquote {margin:0 0 0 4px;}#yiv3681148975 .yiv3681148975bold {font-family:Arial;font-size:13px;font-weight:700;}#yiv3681148975 .yiv3681148975bold a {text-decoration:none;}#yiv3681148975 dd.yiv3681148975last p a {font-family:Verdana;font-weight:700;}#yiv3681148975 dd.yiv3681148975last p span {margin-right:10px;font-family:Verdana;font-weight:700;}#yiv3681148975 dd.yiv3681148975last p span.yiv3681148975yshortcuts {margin-right:0;}#yiv3681148975 div.yiv3681148975attach-table div div a {text-decoration:none;}#yiv3681148975 div.yiv3681148975attach-table {width:400px;}#yiv3681148975 div.yiv3681148975file-title a, #yiv3681148975 div.yiv3681148975file-title a:active, #yiv3681148975 div.yiv3681148975file-title a:hover, #yiv3681148975 div.yiv3681148975file-title a:visited {text-decoration:none;}#yiv3681148975 div.yiv3681148975photo-title a, #yiv3681148975 div.yiv3681148975photo-title a:active, #yiv3681148975 div.yiv3681148975photo-title a:hover, #yiv3681148975 div.yiv3681148975photo-title a:visited {text-decoration:none;}#yiv3681148975 div#yiv3681148975ygrp-mlmsg #yiv3681148975ygrp-msg p a span.yiv3681148975yshortcuts {font-family:Verdana;font-size:10px;font-weight:normal;}#yiv3681148975 .yiv3681148975green {color:#628c2a;}#yiv3681148975 .yiv3681148975MsoNormal {margin:0 0 0 0;}#yiv3681148975 o {font-size:0;}#yiv3681148975 #yiv3681148975photos div {float:left;width:72px;}#yiv3681148975 #yiv3681148975photos div div {border:1px solid #666666;height:62px;overflow:hidden;width:62px;}#yiv3681148975 #yiv3681148975photos div label {color:#666666;font-size:10px;overflow:hidden;text-align:center;white-space:nowrap;width:64px;}#yiv3681148975 #yiv3681148975reco-category {font-size:77%;}#yiv3681148975 #yiv3681148975reco-desc {font-size:77%;}#yiv3681148975 .yiv3681148975replbq {margin:4px;}#yiv3681148975 #yiv3681148975ygrp-actbar div a:first-child {margin-right:2px;padding-right:5px;}#yiv3681148975 #yiv3681148975ygrp-mlmsg {font-size:13px;font-family:Arial, helvetica, clean, sans-serif;}#yiv3681148975 #yiv3681148975ygrp-mlmsg table {font-size:inherit;font:100%;}#yiv3681148975 #yiv3681148975ygrp-mlmsg select, #yiv3681148975 input, #yiv3681148975 textarea {font:99% Arial, Helvetica, clean, sans-serif;}#yiv3681148975 #yiv3681148975ygrp-mlmsg pre, #yiv3681148975 code {font:115% monospace;}#yiv3681148975 #yiv3681148975ygrp-mlmsg * {line-height:1.22em;}#yiv3681148975 #yiv3681148975ygrp-mlmsg #yiv3681148975logo {padding-bottom:10px;}#yiv3681148975 #yiv3681148975ygrp-msg p a {font-family:Verdana;}#yiv3681148975 #yiv3681148975ygrp-msg p#yiv3681148975attach-count span {color:#1E66AE;font-weight:700;}#yiv3681148975 #yiv3681148975ygrp-reco #yiv3681148975reco-head {color:#ff7900;font-weight:700;}#yiv3681148975 #yiv3681148975ygrp-reco {margin-bottom:20px;padding:0px;}#yiv3681148975 #yiv3681148975ygrp-sponsor #yiv3681148975ov li a {font-size:130%;text-decoration:none;}#yiv3681148975 #yiv3681148975ygrp-sponsor #yiv3681148975ov li {font-size:77%;list-style-type:square;padding:6px 0;}#yiv3681148975 #yiv3681148975ygrp-sponsor #yiv3681148975ov ul {margin:0;padding:0 0 0 8px;}#yiv3681148975 #yiv3681148975ygrp-text {font-family:Georgia;}#yiv3681148975 #yiv3681148975ygrp-text p {margin:0 0 1em 0;}#yiv3681148975 #yiv3681148975ygrp-text tt {font-size:120%;}#yiv3681148975 #yiv3681148975ygrp-vital ul li:last-child {border-right:none !important;}#yiv3681148975



[Non-text portions of this message have been removed]

Re: Ebay Rip-off ? - "Global Shipping Program"

John Griessen
 

On 02/10/2016 04:34 AM, 'Mike Usher' musher@... [TekScopes] wrote:
Hi,

The shipping charde was a total of $54.01, which comprised of post & packing
$15.91, and International delivery $38.10.

I'd have to call that a convenience price.

I've not checked since a recent USPS rate increase, but
sending international priority to the UK is reliable, and postage costs about $25 for a flat rate envelope.

If yours was a box such as 5 x 9 x 12 inches weighing a kilo, it could go for $26 plus packing costs
according to http://www.nerdylorrin.net/jerry/postages/index.html#1stClassIntlPkgs, maybe $32 total.

$54 instead of $32 is 70% extra...

Re: TDS 380 calibration and vertical scale problem

Siggi
 

Hey David,

there's no rush - this is after all YOUR scope :).
We're just living vicariously through you to stave off the ... urge ... to
buy the next piece of broken gear.

Good luck,
Siggi

On Wed, 10 Feb 2016 at 13:42 david.wilson92@... [TekScopes] <
TekScopes@...> wrote:



Understand, I will work at getting those results soon, busy at the moment
so check in a few days



[Non-text portions of this message have been removed]


Re: TDS 380 calibration and vertical scale problem

David Wilson
 

Understand, I will work at getting those results soon, busy at the moment so check in a few days

Re: 7904 - Very Dim Trace

David DiGiacomo
 

On Wed, Feb 10, 2016 at 10:56 AM, <jimmcintyre22@...> wrote:

The caps are shown in thr parts list as .001 uF, 4 kV - no problem.

The diodes,( e.g. CR1678, CR1679) are not listed. Anyone have a favorite HV diode for this application?
Tek used 152-0242-00 = selected 1N486A

I like 1N4937, but they are a little larger.

2465BCT Refurbishing

Michael
 

With the last set of part replacements, I now have the 2465BCT working! It
passed the smoke test, and after a few connector glitches, I got everything
reassembled and it passes all diagnostics. Just playing around with the
calibrator signal, everything that I know how to test looks good. I have to
learn how to use all of the features to give it a really good test, but so it
looks great.

I still plan on making some modifications, but I am waiting on parts for most
of those. I am not sure that the fan is working, the case appears fairly warm
but I don't feel any fan exhaust. It may not be warm enough to kick on yet, or
the fan could need replacing or the fan control circuit could be bad. I will
look into that and see what I find.


Mike

Re: 7904 - Very Dim Trace

Jim McIntyre
 

The caps are shown in thr parts list as .001 uF, 4 kV - no problem.

The diodes,( e.g. CR1678, CR1679) are not listed. Anyone have a favorite HV diode for this application?

Re: TDS 380 calibration and vertical scale problem

Ed Breya
 

Yes, that's exactly what we've been hinting at - making measurements and observations to fill in some pieces of the puzzle. Similar parts and circuit info plus the collective smarts here may provide some more pieces, to get closer to figuring out what's in there.

Ed

Re: TDS 380 calibration and vertical scale problem

Siggi
 

Hey David,

If there were an existing schematic of these attenuators, the odds are the
member of this mailing list would know of them and/or have found them
already.

I think the mission we're trying to push on you, is to reverse the
schematic of the attenuator by inspecting and measuring the original you
have in your possession. Here's an EEVBlog video on how this is done <
https://www.youtube.com/watch?v=lJVrTV_BeGg>, though Dave doesn't do a
super job of it :). Thankfully your attenuator is MUCH simpler than the
front-end he's trying to reverse.

If you take a look at the attenuator schematic in the 2465 <
http://www.ko4bb.com/manuals/download.php?file=Tektronix/Tektronix_-_2465_Oscilloscope/Tek_2465A_Service_Manual_070-6019-01_May87.pdf>
you'll see a high-level picture of what's inside. Here <
https://groups.yahoo.com/neo/groups/TekScopes/photos/albums/501546574> are
some pictures of the attenuator hybrids from my 2430 with the relays
popped. If you compare the schematic to the thing, you e.g. see where the
AC coupling cap is, where the 50Ohm resistor is and where each of 10X
attenuators are. We know each one of the attenuators will have pair of
resistors, and we know there's a 1M termination resistor there. Squint a
bit, and you can see all of those, plus some other passives that have
(presumably) to do with the frequency response of the attenuator.
If you look at the service manuals for older scopes (Tek 485 is my fave)
you'll see full schematics for their all-discrete attentuators.

What I expect you have in your attenuator is similar to any other
attenuator, e.g. there will switching for AC/DC coupling, for the CAL
signal, and there will be resistive dividers for the attenuation ratios
(possibly 25/100) each with 1M resistance. There may also be some series
resistance in the input path to allow for current limiting on overload, and
there is some evidence that you have an open series resistor on your CH2.
There may also be multiple resistive dividers dividing the input by
different ratios into different inputs of the preamp IC, in which case the
dividers will have 2M resistance.


Siggi

On Wed, 10 Feb 2016 at 11:29 david.wilson92@... [TekScopes] <
TekScopes@...> wrote:



Thanks for that info,

I uploaded a attuenuator schematic showing the hybrid's connectivity to
the mainboard, no it doesn't show the schematics for the attenuators
themselves but it is information to review at least. If you haven't
already, useful information can be found on a post I made on eevblog.com
http://www.eevblog.com/forum/repair/tds-380-calibration-error/, click
that link to take you directly to the post.


[Non-text portions of this message have been removed]



[Non-text portions of this message have been removed]

Re: 7904 - Very Dim Trace

David DiGiacomo
 

On Wed, Feb 10, 2016 at 12:52 AM, David <@DWH> wrote:
Diagnostics on DC restorers are not much fun. Measurements require a
high voltage probe and component tests require a high voltage power
supply.
In the ones I have repaired, the diode leakage has been pretty obvious
when tested with a 50V power supply. Of course that might not always
be the case. As you say, the parts are cheap.

Re: TDS 380 calibration and vertical scale problem

David Wilson
 

Thanks for that info,

I uploaded a attuenuator schematic showing the hybrid's connectivity to the mainboard, no it doesn't show the schematics for the attenuators themselves but it is information to review at least. If you haven't already, useful information can be found on a post I made on eevblog.com http://www.eevblog.com/forum/repair/tds-380-calibration-error/, click that link to take you directly to the post.