Date   

Experience w/ Calibration Labs Near Chicago?

John Dickens <jake_117_dickens@...>
 

I have a Tek 2247A and HP multimeter (3478A) that I would like to have calibrated locally so I don’t need to risk damage in transit.

Does anyone have experience with any calibration facilities in the Chicago area? There are maybe 20 to choose from and I would like to find a place that is capable of calibrating old equipment where I can drop of and pick up.

Thanks, Jake


Re: Using a new Hantek 200 mhz scope

Bob Albert
 

Thanks for that!  I will have to look at the bad board to see if anything around Q6 looks suspicious.  I had to buy a new RF board to get the radio working but still have the old one.
73, Bob

On Saturday, February 25, 2017 9:53 AM, "ironcoder@charter.net [TekScopes]" <TekScopes@yahoogroups.com> wrote:


  It was Q6. One of the base bias resistors opened up and the transistor went into saturation and started heating. The board underneath was black. I had to rebuild a bit of the traces to make it work again. The original Q6 tested good, but I was not going to use it again after it being baked. I replaced the open transistor. I think it was 1500 ohms and then replaced 2SC2053 with a nice new one. The receiver jumped to life.



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


Re: Using a new Hantek 200 mhz scope

Michael
 

It was Q6. One of the base bias resistors opened up and the transistor went into saturation and started heating. The board underneath was black. I had to rebuild a bit of the traces to make it work again. The original Q6 tested good, but I was not going to use it again after it being baked. I replaced the open transistor. I think it was 1500 ohms and then replaced 2SC2053 with a nice new one. The receiver jumped to life.


Re: Tektronix 545B fan oil location and tubes

Chuck Harris <cfharris@...>
 

Just about every tektronix scope made since the 1950's
has a vertical amplifier delay line. The idea is that
if the trigger samples the vertical signal before the
delay line, and triggers, by the time that the signal
passes through the delay line, the scope will have
started its sweep. The delay line is built into the
scope, and makes it possible for the scope to display
the signal that triggered the trace.

You would be well served to read the fine manual for
your scope. A whole lot of what you need to know to
use your scope, and how it works, is there.

-Chuck Harris

firielnxd@yahoo.com.au [TekScopes] wrote:

Hello, How would you set up the delay line as you suggested? I tried using the
horizontal position knob, and all the square wave signals (and signals from the
181) seemed identical. The settings which displayed the artifacts (not all
time/cm settings showed the behaviour, only some, and different ones on the 181
and the 107). As well, some frequencies from the 107 did not have the behaviour
while others did. Also, given enough time (~5min or so) the artifacts tended to
disappear (on the 107) until the settings were changed again. If you were
referring to the 'delay time' setting on Time base B, then I have a problem in
that time base B does not seem to work. No trace is displayed with time base B
selected. If you have an idea of some components that I should test to try and
get time base B working again, that would be much appreciated. (I hadn't
previously seen any need to use time base B as time base A was working fine, so it
came as rather a surprise that time base B did not work) Thanks, David






------------------------------------ Posted by: firielnxd@yahoo.com.au
------------------------------------


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

Yahoo Groups Links


Re: Another Tek sighting in an old movie

Michael A. Terrell
 

30 minutes a day should only take you a couple years. ;-)

I spent a lot of time on it, when I was too sick to sleep.

-----Original Message-----
From: "Dave Seiter d.seiter@att.net [TekScopes]" <TekScopes@yahoogroups.com>
Sent: Feb 25, 2017 3:01 AM
To: "TekScopes@yahoogroups.com" <TekScopes@yahoogroups.com>
Subject: Re: [TekScopes] Another Tek sighting in an old movie

Why did you have to post that link?  I can see that I probably won't get anything done for a few days now....  Maybe if I restrict myself to 30 minutes/day...
-Dave

From: "'Michael A. Terrell' mike.terrell@earthlink.net [TekScopes]" <TekScopes@yahoogroups.com>
To: TekScopes@yahoogroups.com
Sent: Friday, February 24, 2017 9:47 PM
Subject: Re: [TekScopes] Another Tek sighting in an old movie

  Are you sure that it wasn't a Russian clone of a Tek? They copied the Tek designs quite well, including the Tek knobs.

There are lots of photos of abandoned Russian electronics on a website called, 'English Russia'. Don't blame me if you spend days or weeks plowing through the thousands of pages of photos. :)

http://englishrussia.com/

-----Original Message-----
From: "Dave Seiter d.seiter@att.net [TekScopes]" <TekScopes@yahoogroups.com>
Sent: Feb 24, 2017 10:39 PM
To: "TekScopes@yahoogroups.com" <TekScopes@yahoogroups.com>
Subject: [TekScopes] Another Tek sighting in an old movie

I don't think this one has been spotted yet, but I could be wrong.
At the beginning of Ice Station Zebra, there is a Tek scope in the Russian satellite control room.  Only  the top half is visible, and it's a bad angle, but it's Tek.   Going through all the old submarine movies I've never seen...
-Dave
Michael A. Terrell


Re: Tektronix 545B fan oil location and tubes

David Turner
 

Hello, I forgot to add that the scope's calibrator signal was clean with no issues, but I cannot really test the high frequencies with it.
Thanks,
David


Re: Tektronix 545B fan oil location and tubes

David Turner
 

Hello, How would you set up the delay line as you suggested? I tried using the horizontal position knob, and all the square wave signals (and signals from the 181) seemed identical. The settings which displayed the artifacts (not all time/cm settings showed the behaviour, only some, and different ones on the 181 and the 107). As well, some frequencies from the 107 did not have the behaviour while others did. Also, given enough time (~5min or so) the artifacts tended to disappear (on the 107) until the settings were changed again.
If you were referring to the 'delay time' setting on Time base B, then I have a problem in that time base B does not seem to work. No trace is displayed with time base B selected. If you have an idea of some components that I should test to try and get time base B working again, that would be much appreciated. (I hadn't previously seen any need to use time base B as time base A was working fine, so it came as rather a surprise that time base B did not work)
Thanks,
David


Re: Another Tek sighting in an old movie

Dave Seiter
 

Why did you have to post that link?  I can see that I probably won't get anything done for a few days now....  Maybe if I restrict myself to 30 minutes/day...
-Dave

From: "'Michael A. Terrell' mike.terrell@earthlink.net [TekScopes]" <TekScopes@yahoogroups.com>
To: TekScopes@yahoogroups.com
Sent: Friday, February 24, 2017 9:47 PM
Subject: Re: [TekScopes] Another Tek sighting in an old movie

  Are you sure that it wasn't a Russian clone of a Tek? They copied the Tek designs quite well, including the Tek knobs.

There are lots of photos of abandoned Russian electronics on a website called, 'English Russia'. Don't blame me if you spend days or weeks plowing through the thousands of pages of photos. :)

http://englishrussia.com/

-----Original Message-----
From: "Dave Seiter d.seiter@att.net [TekScopes]" <TekScopes@yahoogroups.com>
Sent: Feb 24, 2017 10:39 PM
To: "TekScopes@yahoogroups.com" <TekScopes@yahoogroups.com>
Subject: [TekScopes] Another Tek sighting in an old movie

I don't think this one has been spotted yet, but I could be wrong.
At the beginning of Ice Station Zebra, there is a Tek scope in the Russian satellite control room.  Only  the top half is visible, and it's a bad angle, but it's Tek.   Going through all the old submarine movies I've never seen...
-Dave
Michael A. Terrell
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[Non-text portions of this message have been removed]


Re: Another Tek sighting in an old movie

Michael A. Terrell
 

Bookmark anything good. I think that it was some of their space research sites had the clone Tek scopes. I had the bookmarked on another computer that died and I haven't attempted to recover the files yet. Too many health issues to care, right now.

-----Original Message-----
From: "Stefan Trethan stefan_trethan@gmx.at [TekScopes]" <TekScopes@yahoogroups.com>
Sent: Feb 25, 2017 1:27 AM
To: TekScopes <TekScopes@yahoogroups.com>
Subject: Re: [TekScopes] Another Tek sighting in an old movie

Don't worry I don't blame you at all Michael, I'm a sucker for
abandoned industry, thanks for the link.

ST

P.S.: I will send you the bill for my time when I'm done. ;-)


On Sat, Feb 25, 2017 at 6:47 AM, 'Michael A. Terrell'
mike.terrell@earthlink.net
There are lots of photos of abandoned Russian electronics on a website called, 'English Russia'. Don't blame me if you spend days or weeks plowing through the thousands of pages of photos. :)

http://englishrussia.com/

Michael A. Terrell


Re: Another Tek sighting in an old movie

Dave Seiter
 

While a Russian clone would be appropriate, I doubt a props department in1968 would come up with anything that subtle!   Even now that would be a stretch, unless someone on the team was a Tek-head.
-Dave

From: "'Michael A. Terrell' mike.terrell@earthlink.net [TekScopes]" <TekScopes@yahoogroups.com>
To: TekScopes@yahoogroups.com
Sent: Friday, February 24, 2017 9:47 PM
Subject: Re: [TekScopes] Another Tek sighting in an old movie

  Are you sure that it wasn't a Russian clone of a Tek? They copied the Tek designs quite well, including the Tek knobs.

There are lots of photos of abandoned Russian electronics on a website called, 'English Russia'. Don't blame me if you spend days or weeks plowing through the thousands of pages of photos. :)

http://englishrussia.com/

-----Original Message-----
From: "Dave Seiter d.seiter@att.net [TekScopes]" <TekScopes@yahoogroups.com>
Sent: Feb 24, 2017 10:39 PM
To: "TekScopes@yahoogroups.com" <TekScopes@yahoogroups.com>
Subject: [TekScopes] Another Tek sighting in an old movie

I don't think this one has been spotted yet, but I could be wrong.
At the beginning of Ice Station Zebra, there is a Tek scope in the Russian satellite control room.  Only  the top half is visible, and it's a bad angle, but it's Tek.   Going through all the old submarine movies I've never seen...
-Dave
Michael A. Terrell
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Re: Another Tek sighting in an old movie

stefan_trethan
 

Don't worry I don't blame you at all Michael, I'm a sucker for
abandoned industry, thanks for the link.

ST

P.S.: I will send you the bill for my time when I'm done. ;-)


On Sat, Feb 25, 2017 at 6:47 AM, 'Michael A. Terrell'
mike.terrell@earthlink.net

There are lots of photos of abandoned Russian electronics on a website called, 'English Russia'. Don't blame me if you spend days or weeks plowing through the thousands of pages of photos. :)

http://englishrussia.com/


Re: Another Tek sighting in an old movie

Michael A. Terrell
 

Are you sure that it wasn't a Russian clone of a Tek? They copied the Tek designs quite well, including the Tek knobs.

There are lots of photos of abandoned Russian electronics on a website called, 'English Russia'. Don't blame me if you spend days or weeks plowing through the thousands of pages of photos. :)

http://englishrussia.com/

-----Original Message-----
From: "Dave Seiter d.seiter@att.net [TekScopes]" <TekScopes@yahoogroups.com>
Sent: Feb 24, 2017 10:39 PM
To: "TekScopes@yahoogroups.com" <TekScopes@yahoogroups.com>
Subject: [TekScopes] Another Tek sighting in an old movie

I don't think this one has been spotted yet, but I could be wrong.
At the beginning of Ice Station Zebra, there is a Tek scope in the Russian satellite control room.  Only  the top half is visible, and it's a bad angle, but it's Tek.   Going through all the old submarine movies I've never seen...
-Dave
Michael A. Terrell


Another Tek sighting in an old movie

Dave Seiter
 

I don't think this one has been spotted yet, but I could be wrong.
At the beginning of Ice Station Zebra, there is a Tek scope in the Russian satellite control room.  Only  the top half is visible, and it's a bad angle, but it's Tek.   Going through all the old submarine movies I've never seen...
-Dave
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Re: yet another 475 with no sweep...

Mark Hatch
 

Thanks! I will try swapping out Q920 and see what happens.

BTW: Probably unrelated (but maybe not...) The "new" timebase board I swapped in had a microswitch on top that appeared to want to interact with the timebase knob when you pulled it out. Figured out that the piece of plastic that goes on the shaft had a slot that the microswitch would engage with. But didn't see any mechanism to push the plastic for the switch to close (or open depending on type of switch). I manually toggled the switch and it didn't magically create a sweep, so I am ignoring it for now. But if this is critical... The original timebase board did not include this switch not a set of header pins on top. Obviously, Tek made some changes to this board over the years...




Mark


Re: LF Compensation of a 468 scope

 

On Fri, 17 Feb 2017 18:50:52 -0200, you wrote:

Thanks David,

I will first look into the decoupling. Although this is the rule #1 in this
forum, I confess may have overlooked it, because my first problem with the
H.V. power supply was a such a pain.

As for the RC networks you mentioned as being thermal balance... You really
got me on this one.
I would never thought of them as anything thermal... What is thermally
dependent in them that anyhow compensate the semicons here? The capacitor?
I've seen diodes that look rather purposeless in circuit that I know are
there for thermals... but capacitors...
Since I`m not desperate yet, I will keep that advice in the sleeve.
Just to be clear, when I am referring to thermal balance networks in
this case, I am referring to C437/R437, C438/R438, R418/C413/R413, and
R423/C423/R425 shown on schematic 4 of the 464. These are parallel RC
networks in series with the collector output of the differential
amplifier stages and before the base or emitter input of the next
stage. The same type of thermal balance circuits can be found in
other areas and earlier in the vertical signal chain. At one point I
wondered what purpose they served so I worked it out and here is what
I concluded.

The differential pairs are inherently balanced to a certain extent;
temperature changes which affect both transistors balance out so while
the common mode output level changes the interferential output does
not and this is a major reason to use differential circuits. But what
about as the differential signal level changes?

Assume that the voltage across (not between) the collectors is fixed
and the output is in the form of a current. If the differential stage
is followed by a cascode like Q416/Q426 which is common for other
reasons, then this is practically the case. Changes in the
differential input signal cause one transistor to conduct more and the
other to conduct less which causes the power dissipation in one
transistor to increase and the other to fall. This causes a thermal
imbalance with Vbe decreasing in the hotter transistor and increasing
in the cooler transistor and that is a problem.

So now instead of allowing a constant voltage across each collector,
add a resistor in series with each collector to divide the voltage in
half so as the current increases, the collector voltage falls and as
the current decreases, the collector voltage rises. Now the power
dissipation in each transistor is the same even as the signal levels
change. When the current on one side increases, the voltage falls and
the power dissipation stays roughly the same. When the current
decreases on the other side, the voltage rises and the power
dissipation also stays roughly the same. Further any change in power
dissipation on each side roughly matches the other. With both
transistors always dissipating the same power, their temperatures stay
matched and their Vbe voltages stay the same.

The problem with this is that the series resistors decrease the high
frequency performance so add bypass capacitors across the resistors to
preserve high frequency performance.

And that is all! Now if a capacitor failed open, the high frequency
performance would be affected but if a resistor shorted out or if the
resistors drifted in value so they do not match, then the thermal
balance would be affected.

...

BTW, back to that event that I found R474 open, that I basically checked
every component of the board, I also did a basic check of U464
(out-of-circuit diode test between every possible pin) and found everything
right WITH ONE EXCEPTION.
My U464 reads internally short between pin 11 and pin 13!
Do you know if this is normal to this 155-0115-00?
The scope works so well other than the small LF deviation!

Rgrds,

Fabio
The 464 schematic I have shows the internal details of the 155-0115-00
and I do not see any way that pins 11 and 13 could be shorted together
unless there was major damage.


Re: scope cleaning

Vince Vielhaber
 

And by doing that anyone trying to follow the thread is lost not knowing what your comments are referring to.

Vince.

Posted at 4:11pm EST. We'll see how long yahoo takes.

On 02/24/2017 11:18 AM, David Berlind david@berlind.org [TekScopes] wrote:


@clive et al, one thing I try to do is when I first put my cursor into the
field for the message body (regardless of whether I'm directly in Yahoo or
my email client), I do a "Select All" (as if I were about to copy and
paste) and then I delete the selected text. I believe select all on Windows
is CTRL-A. On the Mac (what I have), its Command-A. Not sure if this is
helpful, but I'm pretty sure in my case, it's resulting in relatively clean
messages.


Re: LF Compensation of a 468 scope

 

Suppose IBM owned 20% of Motorola? I am not saying Motorola was the greatest in the marketing or business arena.
But they did have a better processor. Of course that is just Monday morning quarterbacking.

Hey, are you going to Dayton?

----- Original Message -----
From: Chuck Harris cfharris@erols.com [TekScopes]
To: TekScopes@yahoogroups.com
Sent: Friday, February 24, 2017 2:32 PM
Subject: Re: [TekScopes] LF Compensation of a 468 scope



Honestly? How much better could it have done?

Intel based PC's ate the lunch of everything, the
680XX, the Power PC, the RISC, stuff, most mainframes...

I can't see Motorola ever doing that. They had a
much better processor, but a much worse attitude.

-Chuck Harris

'Tom Miller' tmiller11147@verizon.net [TekScopes] wrote:
> IBM had a large financial interest in Intel at the time. See:
> http://www.nytimes.com/1987/08/29/business/ibm-ends-intel-financial-support.html
>
> That is why the PC was based on the Intel processor. In my opinion, the PC would
> have done better with the Motorola 68K processors. Since IBM owned about 20% of
> Intel, they pretty much had the clout to demand a second source for the chips.
>
> Regards




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


Re: Cleaning the front of the scope

n4buq
 

Hi David,

Good deal. If I'm not mistaken, if you get the voltage calibrations done, provided the precision resistors for the various Ohms ranges are still good, then I think the Ohms mode is calibrated in the process. I see pots in series and parallel with the meter movement and if those have been set incorrectly, it will affect most, if not all, modes/ranges.

While short, low-resistance, leads are good, they're not all that critical for most resistance measurements. You'd most likely only be introducing a few extra Ohms which doesn't really matter that much if you're measuring resistances of hundreds or thousands of Ohms with normal tolerances.

Good luck with it.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "David Berlind david@berlind.org [TekScopes]" <TekScopes@yahoogroups.com>
To: TekScopes@yahoogroups.com
Sent: Friday, February 24, 2017 1:28:00 PM
Subject: Re: [TekScopes] Re: Cleaning the front of the scope

Hi @barry...

meant to say thank you for pointing me back to the Simpson260 site. I had
been there for both the user and repair manual but didn't think to look
harder for a separate calibration manual. In fact, there is one there for
my meter and it looks like it was prepared for the military. So, good news
is that there's a calibration manual and I'll probably be able to get the
volts dialed in just as soon as I can hook up to something with more than
250 volts (like an amp that I don't currently have in my possession). Bad
news is that there's no calibration for ohms. Slight silver lining is that
there's a footnote that says to use short test leads when doing resistance
testing. So, I need to build or acquire some leads that are shorter than
the ones I've got to see if that works.





Re: LF Compensation of a 468 scope

Chuck Harris <cfharris@...>
 

Honestly? How much better could it have done?

Intel based PC's ate the lunch of everything, the
680XX, the Power PC, the RISC, stuff, most mainframes...

I can't see Motorola ever doing that. They had a
much better processor, but a much worse attitude.

-Chuck Harris

'Tom Miller' tmiller11147@verizon.net [TekScopes] wrote:

IBM had a large financial interest in Intel at the time. See:
http://www.nytimes.com/1987/08/29/business/ibm-ends-intel-financial-support.html

That is why the PC was based on the Intel processor. In my opinion, the PC would
have done better with the Motorola 68K processors. Since IBM owned about 20% of
Intel, they pretty much had the clout to demand a second source for the chips.

Regards


Re: Cleaning the front of the scope

David Berlind
 

Hi @barry...

meant to say thank you for pointing me back to the Simpson260 site. I had
been there for both the user and repair manual but didn't think to look
harder for a separate calibration manual. In fact, there is one there for
my meter and it looks like it was prepared for the military. So, good news
is that there's a calibration manual and I'll probably be able to get the
volts dialed in just as soon as I can hook up to something with more than
250 volts (like an amp that I don't currently have in my possession). Bad
news is that there's no calibration for ohms. Slight silver lining is that
there's a footnote that says to use short test leads when doing resistance
testing. So, I need to build or acquire some leads that are shorter than
the ones I've got to see if that works.

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