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Re: What was the first oscilloscope to have cursors?

nj902
 

I was just curious - not so much about the word 'cursor' - but as to who first offered a scope that gave users a way to make (somewhat) precise measurements of waveform parameters instead of having to count graticule lines and guesstimate. It looks like the Dumont was first.

It's interesting to follow the evolution of concepts from the first implementation to incredible products like the 7854 and DSA602 through to today where cursors and waveform measurements are an intrinsic part of even the most basic new scope.


Re: 575 Bottom panel - questions, sources, etc.

Michael W. Lynch
 

On Sat, Aug 14, 2021 at 01:18 PM, Glydeck wrote:


Kieth,

Sorry for the delay but I had to go measure. The panels on the oscilloscopes
535, 547, etc. are 20 3/8” long. The 575 & 570 panels are 18 3/8” long.
toggle quoted message Show quoted text ( #quoted-190948992 )
Since this is not a "restoration" and "perfection" is not the end game, would it be possible to use the longer 5xx series panel and CAREFULLY cut it down to size? Just a thought. .

--
Michael Lynch
Dardanelle, AR


475 with Vertical Amp problems?

Michael W. Lynch
 

I am attempting to rescue one good 475 from a pair of "parts mule" 475's.

Both are down for various reasons, but one scope in particular offers the promise of making into a very nice scope.

The problem is that what should be a focused "DOT" moving across the CRT is now a wide, fuzzy mostly vertical band, stretching from top to bottom of the CRT. Focus and astig do not appear to have any effect, but since there is not a dot, it is impossible to determine this conclusively.

Here is what I have:
a known good CRT (worked in another salvaged unit)
all LVPS rails are in spec for voltage and ripple (replaced one bad -8V filter cap)
HV is -2450
Horizontal sweep of the fuzzy band seems to respond to the position and sweep speed controls
"A" trigger works on single sweep
Intensity seems to work (sort of) intensity is not excessively bright and can be turned up or down until the band goes away.

The voltage across the DC Restorer 82V Zener is a bit low at 77 V. The CRT was operating in another scope, where it showed a bright, clean, focused and mostly controllable dot and/or trace. When that "good" CRT is installed into the "new" scope, the issue appears, so it seems to be with the vertical section of this scope or something closely related to that section. Position controls do not seem to be working, but the "fuzzy band" does not lend itself to being "positioned" either.

I have repaired a couple dozen of these 4xx Series scopes, however, I have not had a lot of experience in particular with the 475/475A vertical section and the distributed vertical plate system. Is it possible that the HV multiplier is "bad"? I have never tried to test this before. Is it possible to confirm the HV Multiplier output voltage by unplugging the HV anode lead of the CRT and probing with a HV probe? I have an 80K-40 Fluke probe. I just do not want to cause damage by an ill advised attempt at such a test.

The 475 manual is not nearly as detailed and complete as the 465/465B manuals. I have several different versions of the 475 manual available.

I do have enough spares to replace almost anything in the scope, with a few exceptions.

Any ideas, questions or comments are welcomed.

Sincerely,
--
Michael Lynch
Dardanelle, AR


Re: 575 Bottom panel - questions, sources, etc.

Glydeck
 

Kieth,

Sorry for the delay but I had to go measure. The panels on the oscilloscopes 535, 547, etc. are 20 3/8” long. The 575 & 570 panels are 18 3/8” long.

On Aug 12, 2021, at 3:20 PM, Keith <coolblueglow@...> wrote:

Hi guys and gals,

So the 575 restoration is progressing nicely. I made it through calibration today for the first time! :-) Now I'm looking forward to the moment when I can put the cases on it and start to build Dennis Tilman's VTCT, (yea, Dennis!)

but...

I am lacking the 575 bottom panel. :-/

I see some "500 series" panels on Fleabay, but nothing specific to a 575. And, to figure out interchangeability, I've looked at the various Tek 500 series bottom panel part numbers. So far, the 575 has an unique part number, a couple of them, actually. It is 387-089 for mine, and 386-620 for early serial number units - below #2266.

However, some have suggested that this unique number isn't that significant - perhaps a cosmetic or other minor difference. Some folks feel that lots of 500 series bottoms might physically interchange. Unfortunately, I just have no idea.

So...can anyone comment from a position of certainty? Will (for example) a 535 or 545 or 585 bottom panel fit a 575?

FWIW, this is a working instrument, not a museum piece (not making fun of numbers-correct restos, either. This is just isn't one)

Any wisdom would be much appreciated.

Keith
coolblueglow





Re: What was the first oscilloscope to have cursors?

Clark Foley
 

While I agree that Nicolet produced the first DIGITAL scope with measurement sticks(crosshair) in 1972/1973 it was not the first oscilloscope to offer measurements indicated by little bright bits or lines. At the time of the 567/6R1 and later the 568/230 which pre-date Nicolet 1090, the term CURSOR was not used; however, these instruments produced a numeric display of the values indicated by intensified segments of the trace.

Are we interested in the user interface concept of moving little bright bits along the trace or are we interested in a specific implementation of those little bright bits?


Re: 2465B - R1018 went out violently

n4buq
 

As a follow-up, I hadn't checked the fuse and, yes, it is blown which explains why the scope went dead and would be expected under the circumstances.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "n4buq" <n4buq@...>
To: TekScopes@groups.io
Sent: Saturday, August 14, 2021 1:06:52 PM
Subject: [TekScopes] 2465B - R1018 went out violently

Not a good day here. I pulled out my 2445 and discovered there's no trace.
No beam finder, nothing on the CRT. Not wanting to dig into that, I pulled
out my 2465B. It worked for about 15 minutes when a crackling sound
followed by smoke and a rather dead scope followed. I unplugged it and
pulled the LVPS boards to find R1018 to have burned out quite dramatically.

I haven't disassembled the two boards so haven't checked very much yet;
however, I'm thinking that C1018 is the ropot cause. It's an original RIFA
and shows significant cracking (as well as does its brother, C1016 - both of
which will be replaced). I presume C1018 failed as a short and R1018
suffered the consequences, correct?

L1012 is very close and physically parallel to R1018 and shows a lot of soot
on it. I don't know if that will need to be replaced but am wondering if
intense heat could have damaged the enamel on its coils.

I recently joked about being "disappointed" when the RIFA in my 2445 smoked
but wasn't very violent so I suppose this is payback for that. :)

Anyway, is C1018 likely the cause?

Thanks,
Barry - N4BUQ







2465B - R1018 went out violently

n4buq
 

Not a good day here. I pulled out my 2445 and discovered there's no trace. No beam finder, nothing on the CRT. Not wanting to dig into that, I pulled out my 2465B. It worked for about 15 minutes when a crackling sound followed by smoke and a rather dead scope followed. I unplugged it and pulled the LVPS boards to find R1018 to have burned out quite dramatically.

I haven't disassembled the two boards so haven't checked very much yet; however, I'm thinking that C1018 is the ropot cause. It's an original RIFA and shows significant cracking (as well as does its brother, C1016 - both of which will be replaced). I presume C1018 failed as a short and R1018 suffered the consequences, correct?

L1012 is very close and physically parallel to R1018 and shows a lot of soot on it. I don't know if that will need to be replaced but am wondering if intense heat could have damaged the enamel on its coils.

I recently joked about being "disappointed" when the RIFA in my 2445 smoked but wasn't very violent so I suppose this is payback for that. :)

Anyway, is C1018 likely the cause?

Thanks,
Barry - N4BUQ


Re: 500-series plugin connector (for DIY plugin or extender)

Dave Wise
 

Sorry, that’s a completely different connector. Emissionlabs has mistaken the “500-series” subject line to mean “TM500 series”. The former is oscilloscopes, the latter is a modular test instrument system.

Dave Wise

From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of John Griessen via groups.io
Sent: Saturday, August 14, 2021 7:04 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] 500-series plugin connector (for DIY plugin or extender)

On 8/14/21 12:35 AM, emissionlabs wrote:
I found this connector in Ebay.https://www.ebay.de/itm/143991611326. Very good quality. Pictured tin plated, but when it arrived it was gold plated. It was only 3.37 Euro incl. shipment from China, and it arrived within 2 weeks. I want to make an extender with flexible cable, using only the power supply wires.
What number of pins is needed for a 544 with 1A1?


Re: 500-series plugin connector (for DIY plugin or extender)

John Griessen
 

On 8/14/21 12:35 AM, emissionlabs wrote:
I found this connector in Ebay.https://www.ebay.de/itm/143991611326. Very good quality. Pictured tin plated, but when it arrived it was gold plated. It was only 3.37 Euro incl. shipment from China, and it arrived within 2 weeks. I want to make an extender with flexible cable, using only the power supply wires.
What number of pins is needed for a 544 with 1A1?


Re: 500-series plugin connector (for DIY plugin or extender)

emissionlabs
 

I found this connector in Ebay. https://www.ebay.de/itm/143991611326. Very good quality. Pictured tin plated, but when it arrived it was gold plated. It was only 3.37 Euro incl. shipment from China, and it arrived within 2 weeks. I want to make an extender with flexible cable, using only the power supply wires.

These look also interesting.

https://www.ebay.de/itm/164437683076?


Re: 500-series plugin connector (for DIY plugin or extender)

Dave Seiter
 

I have one of the rectangular section extenders, but it doesn't get too much use.  I made a long flexible years ago that gets most of the use.  Not good for high speeds, but it doesn't really have to be.
-Dave

On Friday, August 13, 2021, 12:19:17 PM PDT, Roy Morgan <k1lky68@...> wrote:



Roy Morgan
K1LKY Western Mass

On Aug 13, 2021, at 11:50 AM, David Kuhn <Daveyk021@...> wrote:

I can see that useful for making an extender cable.  I wonder if there ever
were any official extender cables for the 500 series?
There were extenders, rectangular cross section ridgid aluminum with the connectors on the ends, some 8 or 9 inches long.  The part number(s) have been mentioned on the list a while ago.

I have a flexible cable but it looks very home- or shop-made.

Roy

On Fri, Aug 13, 2021 at 8:24 AM nicmatfr <nic_o_mat@...>
...

Hello all
Would anyone be interested in connectors for the 500-series plugins ? ...


Re: What was the first oscilloscope to have cursors?

nj902
 

When was the Nicolet scope introduced?

The one I was thinking of is the Dumont Type 425 High-Frequency Digital readout oscilloscope with:
"direct reading digital readout on two axes"
"an unusual two-dot method of waveform measurement"
@$2750 in 1960!


Re: 500-series plugin connector (for DIY plugin or extender)

Jared Cabot
 

I use part number 305-056-520-201 from Digikey/Mouser etc for the card edge connector inside the TM500 mainframes.


Unable to find manual for PS282

James
 

I picked up a PS282 recently as part of a lot. It looks like it works but is out of cal. It’s a piece of cake to find the manual for the PS280 and 283 but aside from a handful of pictures on the wiki I can’t even find a spec sheet for the 282. Does anybody have a lead on this service manual?


Re: 500-series plugin connector (for DIY plugin or extender)

Dave Wise
 

The outer jacket of my cable was extremely stiff. I ended up slitting it off and substituting polyethylene spiral wrap. Now twisting it doesn’t flex the solder joints at the connectors.

Dave Wise

From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Tim Phillips via groups.io
Sent: Friday, August 13, 2021 11:06 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] 500-series plugin connector (for DIY plugin or extender)

I have an 012-038 cable. 32 inches long, with metal shrouds on the
connectors.
I'm guessing it's quite old, by the part number and the crackle finish on
the shrouds.
Tim


On Fri, 13 Aug 2021 at 18:10, Albert Otten <aodiversen@...> wrote:

II wonder if there ever were any official extender cables for the 500
series?
Sure David, at least the already mentioned 013-019, and its successor
013-0055-00.
More info in the 1968 Calibration Fixtures Catalog (Tekwiki under
Catalogs).
Note that some 500 series scopes (e.g. 564) needed another type of
extender.
Albert






Re: 500-series plugin connector (for DIY plugin or extender)

Roy Morgan <k1lky68@...>
 

Roy Morgan
K1LKY Western Mass

On Aug 13, 2021, at 11:50 AM, David Kuhn <Daveyk021@...> wrote:

I can see that useful for making an extender cable. I wonder if there ever
were any official extender cables for the 500 series?
There were extenders, rectangular cross section ridgid aluminum with the connectors on the ends, some 8 or 9 inches long. The part number(s) have been mentioned on the list a while ago.

I have a flexible cable but it looks very home- or shop-made.

Roy

On Fri, Aug 13, 2021 at 8:24 AM nicmatfr <nic_o_mat@...>
...

Hello all
Would anyone be interested in connectors for the 500-series plugins ? ...


Re: 500-series plugin connector (for DIY plugin or extender)

David Kuhn
 

" successor 013-0055-00"

I found one, new in the original bag/instructions, never opened on EBAY for
$50. I jumped on that and got it ordered right away; thank you!

Dave

On Fri, Aug 13, 2021 at 1:10 PM Albert Otten <aodiversen@...> wrote:

II wonder if there ever were any official extender cables for the 500
series?
Sure David, at least the already mentioned 013-019, and its successor
013-0055-00.
More info in the 1968 Calibration Fixtures Catalog (Tekwiki under
Catalogs).
Note that some 500 series scopes (e.g. 564) needed another type of
extender.
Albert






Re: 500-series plugin connector (for DIY plugin or extender)

Tim Phillips
 

I have an 012-038 cable. 32 inches long, with metal shrouds on the
connectors.
I'm guessing it's quite old, by the part number and the crackle finish on
the shrouds.
Tim

On Fri, 13 Aug 2021 at 18:10, Albert Otten <aodiversen@...> wrote:

II wonder if there ever were any official extender cables for the 500
series?
Sure David, at least the already mentioned 013-019, and its successor
013-0055-00.
More info in the 1968 Calibration Fixtures Catalog (Tekwiki under
Catalogs).
Note that some 500 series scopes (e.g. 564) needed another type of
extender.
Albert






Re: 500-series plugin connector (for DIY plugin or extender)

Albert Otten
 

II wonder if there ever were any official extender cables for the 500 series?
Sure David, at least the already mentioned 013-019, and its successor 013-0055-00.
More info in the 1968 Calibration Fixtures Catalog (Tekwiki under Catalogs).
Note that some 500 series scopes (e.g. 564) needed another type of extender.
Albert


Re: 465B Horizontal Sweep help

 

If both deflection plates are stuck at 100V+, the problem is not likely to be the sweep, rather, the horizontal amplifier itself. A sweep problem would leave one plate high and the other low.
--
Bob Haas

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