Date   
Re: HV supply alternative? Re: [TekScopes] Tektronix 576 curve tracer

Craig Sawyers <c.sawyers@...>
 

Those are small packages for such high voltage. Did you pot them?

Dave Wise
Somewhere in the archives is a post by the late great Deane Kidd. He rebuilt a multiplier for one
scope, and just used corona dope over the connection points - no potting at all.

Craig

Re: HV supply alternative? Re: [TekScopes] Tektronix 576 curve tracer

Craig Sawyers <c.sawyers@...>
 

Craig

Thanks for allowing me to post it. I failed on my attempted a few years ago, but just got some 38
aWG
200C wire on order and was going to put it on the list to try a 647 again.

Can you please tell us about how may hours you have on your rewind so far?
And are there any other pictures?
Thanks

John

John

Took me three days all told. Two days to try the first time and the second one to do it properly.
Plus a day of research to find a cheap winder, procure tapes of the right width, find a former that
would fit the window in the transformer core and experimenting on how to modify it, find out the
ratio of beeswax to paraffin wax to pot (google) etc etc. So maybe three days all told.

But the 576 cost me nothing at all, which was excellent. So it was worth three days of my time to
resurrect it.

But no - no other pictures alas.

Craig

Re: My Next Scope

Michael A. Terrell
 

'Art of Electronics' co-authored by Win Hill?

-----Original Message-----
From: ken chalfant <kpchalfant@...>
Sent: Feb 6, 2018 10:44 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] My Next Scope

Greetings,

While I have nothing to ask, kindly allow me to ask a question.

“…self learning using AOE”

What is AOE?

Thank you.

Ken

All,

I am learning electronics - a lifetime interest that I never had time to indulge in but now self learning using AOE! Its great fun. To aid my understanding I bought a Tek 2213 (not A) and have enjoyed the heck out of it for the last 6 months. I learned a ton from simply getting the service manual, opening the machine up, tuning it, checking voltages, etc. It accelerated my learning. And it works great now (though intens mode works on and off). I have kind of also fallen in love with the machine (and I know many on this site are not great fans of this model).


Michael A. Terrell

Re: NVRAM 2465 /2467 replacement

Chuck Harris
 

Yeah, I guess that must be right, as it remembers
cursor state, and toggle button states. It doesn't
do that thing the 2465A/B does where it assumes that
the current rotational state of a knob is the same
as the operational state when the scope was turned-off.

Exerciser 02 reads the EAROM, I recall knowing about
a companion routine that read/writes the EAROM... but
a quick scan of the manual leads to nothing.

I will see if I can dig it up in my papers...

-Chuck Harris


Mark Litwack wrote:

On Tue, Feb 6, 2018 at 05:45 am, Chuck Harris wrote:

Unlike the NVRAM in the 2465b, or the battery backed
up RAM in the early B, or 2465A models, the 2465's
EAROM is not written every time you turn the scope on/off.

The 2465's EAROM serves only to store the calibration
constants for the scope. It only gets written during
calibration.
Actually, the 2465 EAROM is written after a 10 second delay each time you change stateful front panel settings such as cursor positions, trigger modes, coupling, etc. This is how it remembers those settings. But it's still not a lot of writes.

Since the calibration constants are stored in only a
very few slots in the EAROM, it is quite feasible to,
as Tom G. stated, use the test program in the 2465 to
read out the calibration constants to the screen, and
save/restore the data manually.

If the data evaporates one day, simply rewriting it
should make it good again. I have seen this happen.
How can the EAROM data be written? I know it's possible via the GPIB interface if the scope is equipped with one, but is there a way to do it from the front panel?

Re: My Next Scope

ken chalfant
 

Sorry for my typing (thinking) error.

First sentence should read: While I have nothing to add, kindly allow me to ask a question.

Ken

On 6Feb, 2018, at 8:44 PM, ken chalfant <kpchalfant@...<mailto:kpchalfant@...>> wrote:

Greetings,

While I have nothing to ask, kindly allow me to ask a question.

“…self learning using AOE”

What is AOE?

Thank you.

Ken

All,

I am learning electronics - a lifetime interest that I never had time to indulge in but now self learning using AOE! Its great fun. To aid my understanding I bought a Tek 2213 (not A) and have enjoyed the heck out of it for the last 6 months. I learned a ton from simply getting the service manual, opening the machine up, tuning it, checking voltages, etc. It accelerated my learning. And it works great now (though intens mode works on and off). I have kind of also fallen in love with the machine (and I know many on this site are not great fans of this model).

Re: My Next Scope

ken chalfant
 

Greetings,

While I have nothing to ask, kindly allow me to ask a question.

“…self learning using AOE”

What is AOE?

Thank you.

Ken


All,

I am learning electronics - a lifetime interest that I never had time to indulge in but now self learning using AOE! Its great fun. To aid my understanding I bought a Tek 2213 (not A) and have enjoyed the heck out of it for the last 6 months. I learned a ton from simply getting the service manual, opening the machine up, tuning it, checking voltages, etc. It accelerated my learning. And it works great now (though intens mode works on and off). I have kind of also fallen in love with the machine (and I know many on this site are not great fans of this model).

Re: OT: looking for datasheet/info on Rockwell RI41404 RF prescaler

Ed Breya
 

I got a partial answer to my question. It turns out that one of the RX blocks has an older, nicer, more user-friendly microwave board in it. It has quite a bit of labeling right on it that names each stage and frequency. It has tiny sapphire substrate BPFs mounted too, and even they have their frequency ranges on them - in very very tiny print. The LO is around 6 GHz, doubled to 12, then tripled to the 38 GHz range, so 6x overall. The divide by 4 of the LO by the prescaler would be in the 1.5 GHz range, which fits the MB1507 OK.

Also, the prescaler IC has the Rockwell logo and same 41404 on it, which confirms that aspect of the ID. Still no datasheet though. It would be nice to find eventually.

Ed

531A: broken plastic piece behind CRT.

Sebastian Garcia
 

Hi there, I'm looking for help on the following issue.

This is an aged plastic piece behind the CRT, partially broken from the
rear side of the scope. Seems to be the CRT securing ring.

As the remaining part in the ensemble is still rigid and seems reliable
enough for some time, don't want to touch it until I can gather a
replacement part.

This is the second similar case I see for a type 531A, so it may be a very
known problem.

Any comment on a similar experience will be greatly appreciated.

Regards,
Sebastian.

Re: NVRAM 2465 /2467 replacement

Tom Gardner
 

On 06/02/18 14:06, Mark Litwack wrote:
On Tue, Feb 6, 2018 at 05:45 am, Chuck Harris wrote:
Unlike the NVRAM in the 2465b, or the battery backed
up RAM in the early B, or 2465A models, the 2465's
EAROM is not written every time you turn the scope on/off.

The 2465's EAROM serves only to store the calibration
constants for the scope. It only gets written during
calibration.
Actually, the 2465 EAROM is written after a 10 second delay each time you change stateful front panel settings such as cursor positions, trigger modes, coupling, etc. This is how it remembers those settings. But it's still not a lot of writes.
That's my understanding, too.

How can the EAROM data be written? I know it's possible via the GPIB interface if the scope is equipped with one, but is there a way to do it from the front panel?
Not that I know of.

One attraction of using a small MCU (as a bit-banged emulation of the serial EAROM) is that the EEPROM contents could be initialised during programming, before insertion into the 2465.

Re: HV supply alternative? Re: [TekScopes] Tektronix 576 curve tracer

Dave Wise
 

Those are small packages for such high voltage. Did you pot them?

Dave Wise
________________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of @garp66 <@garp66>
Sent: Tuesday, February 06, 2018 1:26 PM
To: TekScopes@groups.io
Subject: Re: HV supply alternative? Re: [TekScopes] Tektronix 576 curve tracer

I have found a source of discrete HV diodes, for a variety of repairs, from a company called VMI in Calif. USA: (no affiliation).

http://www.voltagemultipliers.com/html/diodes.html

I have used their 10KV diode, P/N: M100FF5, with good results.
http://www.voltagemultipliers.com/pdf/M50FF3_M100FF3_M50FF5_M100FF5.pdf

Re: My Next Scope

Harvey White
 

On Tue, 06 Feb 2018 08:42:15 -0800, you wrote:

All,
You have a lot of options.

I am learning electronics - a lifetime interest that I never had time to indulge in but now self learning using AOE! Its great fun. To aid my understanding I bought a Tek 2213 (not A) and have enjoyed the heck out of it for the last 6 months. I learned a ton from simply getting the service manual, opening the machine up, tuning it, checking voltages, etc. It accelerated my learning. And it works great now (though intens mode works on and off). I have kind of also fallen in love with the machine (and I know many on this site are not great fans of this model).
You'd like a good breadboard setup, decent power supplies, signal
sources, and some decent meters. I suspect that you may know when you
will need these, there will be something that needs them.

So now I am thinking of investing in my next analog Tek scope and getting one that may have more bells and whistles. Perhaps a storage display, cursors, more bandwidth, etc. Which models should I prioritize? I know enough of my own limitations, that with the more advanced scopes, I won't quite yet be able to get in there and tinker as much at my level, so looking for models that are more reliable. I will likely splurge/look for a completely refurbished one at this point.
I personally like the 7000 series of lab scopes. You get a mainframe
(pick bandwidth up to ... practically... 500 Mhz), then you add
plugins to get a working scope. That's certainly one way of going.
Another way is to upgrade from what you have, more bandwidth, etc.

I find that 3 or 4 channels (I have the choice) is sufficient for an
involved project that is *not* digital. If you go digital, then you
may find that 32 channels is not sufficient, or barely is. At that
point you may wish to investigate logic analyzers. Different subject,
different field, and perhaps certainly not the same as an
oscilloscope. There are similarities, though. You may never need
one, you may decide you need one, it all varies (yes, I have both).



Also realizing that the next phase of my learning is more likely to be in digital electronics and have the question of whether an analog scope will serve fully, or should I just enjoy my pet 2213 and go for a more modern scope (I really don't want to if I don't have to!).
A good scope, although 60 Mhz is limited rather severely for what I
might want (I do microprocessor designs with FPGA's, display
interfacing, communications interfacing between boards, and the like.
Just think that I need something like what you've got, but on
steroids....)

You'll be able to do a bunch with what you have. I'd suggest going
ahead with learning and you'll see where your equipment is not equal
to the task. At that point, I'd look for something different.

By doing this, you'll have an idea of not only what you'd want, but
why you'd want it. (things not to be discarded easily when making
decisions).


Thank you for your advice and thoughts.
a lot depends on what branch of electronics you concentrate on, and at
what depth. Audio amplifiers and anything that runs below 1.0 Mhz
will be fine with your scope, although you may want to look at three
things at once (an input, an output, and then what you're looking at
inbetween). Your choice here.

Digital tends to want more channels, but only digital ones, which
tends to indicate logic analyzer over scope. Be aware that there are
two different approaches to logic analyzers, that of Tektronix, and
that of HP. They are not the same.

Tektronics scopes I am quite fond of, HP scopes not so much (I do have
two). Tektronix logic analyzers not at all fond of (I have one), HP
logic analyzers, though, that I can make sense of and like. Lots of
personal choices/style selections here.

Harvey


Anil.

Re: My Next Scope

J. L. Trantham
 

Anil,

My vote would be a TEK 485 or 2465B.

Good luck.

Joe

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of ashrivastava@...
Sent: Tuesday, February 06, 2018 10:42 AM
To: TekScopes@groups.io
Subject: [TekScopes] My Next Scope

All,

I am learning electronics - a lifetime interest that I never had time to indulge in but now self learning using AOE! Its great fun. To aid my understanding I bought a Tek 2213 (not A) and have enjoyed the heck out of it for the last 6 months. I learned a ton from simply getting the service manual, opening the machine up, tuning it, checking voltages, etc. It accelerated my learning. And it works great now (though intens mode works on and off). I have kind of also fallen in love with the machine (and I know many on this site are not great fans of this model).

So now I am thinking of investing in my next analog Tek scope and getting one that may have more bells and whistles. Perhaps a storage display, cursors, more bandwidth, etc. Which models should I prioritize? I know enough of my own limitations, that with the more advanced scopes, I won't quite yet be able to get in there and tinker as much at my level, so looking for models that are more reliable. I will likely splurge/look for a completely refurbished one at this point.

Also realizing that the next phase of my learning is more likely to be in digital electronics and have the question of whether an analog scope will serve fully, or should I just enjoy my pet 2213 and go for a more modern scope (I really don't want to if I don't have to!).

Thank you for your advice and thoughts.

Anil.
--
AShrivastava
New York

Re: More vectorscope questions (1740, 1420)

jafinch78 .
 

Seems the manuals I've found are all related to the 1740A in my search for information related to the 1740 I have acquired. From what I've watched online... looks like there was a separate hardware device at that era for use with audio... the 760A for example in the video referenced in the other comments that happened to be in my youtube history of just watching and not related to this post thread.

Someone was wondering about the 1720. Does anyone know definitively if the 1740 CRT will work with the 1720/1730 series?

Thanks in advance,

James

Re: NVRAM 2465 /2467 replacement

Mark Litwack
 

On Tue, Feb 6, 2018 at 05:45 am, Chuck Harris wrote:

Unlike the NVRAM in the 2465b, or the battery backed
up RAM in the early B, or 2465A models, the 2465's
EAROM is not written every time you turn the scope on/off.

The 2465's EAROM serves only to store the calibration
constants for the scope. It only gets written during
calibration.
Actually, the 2465 EAROM is written after a 10 second delay each time you change stateful front panel settings such as cursor positions, trigger modes, coupling, etc. This is how it remembers those settings. But it's still not a lot of writes.

Since the calibration constants are stored in only a
very few slots in the EAROM, it is quite feasible to,
as Tom G. stated, use the test program in the 2465 to
read out the calibration constants to the screen, and
save/restore the data manually.

If the data evaporates one day, simply rewriting it
should make it good again. I have seen this happen.
How can the EAROM data be written? I know it's possible via the GPIB interface if the scope is equipped with one, but is there a way to do it from the front panel?

My Next Scope

ashrivastava@...
 

All,

I am learning electronics - a lifetime interest that I never had time to indulge in but now self learning using AOE! Its great fun. To aid my understanding I bought a Tek 2213 (not A) and have enjoyed the heck out of it for the last 6 months. I learned a ton from simply getting the service manual, opening the machine up, tuning it, checking voltages, etc. It accelerated my learning. And it works great now (though intens mode works on and off). I have kind of also fallen in love with the machine (and I know many on this site are not great fans of this model).

So now I am thinking of investing in my next analog Tek scope and getting one that may have more bells and whistles. Perhaps a storage display, cursors, more bandwidth, etc. Which models should I prioritize? I know enough of my own limitations, that with the more advanced scopes, I won't quite yet be able to get in there and tinker as much at my level, so looking for models that are more reliable. I will likely splurge/look for a completely refurbished one at this point.

Also realizing that the next phase of my learning is more likely to be in digital electronics and have the question of whether an analog scope will serve fully, or should I just enjoy my pet 2213 and go for a more modern scope (I really don't want to if I don't have to!).

Thank you for your advice and thoughts.

Anil.
--
AShrivastava
New York

Re: Tek 11801a questions: Nvram battery replacement; SD-26 & SD-24 TDR heads & possible probes ?

Michael A. Terrell
 

He still posts on the sci.electronics.design newsgroup.

-----Original Message-----
From: @garp66
Sent: Feb 6, 2018 6:58 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tek 11801a questions: Nvram battery replacement; SD-26 & SD-24 TDR heads & possible probes ?

Also: for the Tektronix 11801a scope:

3 ] Am looking for the article by John Larkin covering the Tektronix 11801 Timebase Errors:
I have tried to find an actual working Web link to this article, but, No luck.

" Tek 11801 Timebase Errors by John Larkin, Highland Technology Inc, jjlarkin@... 11801 and CSA803_TB_error 5622 repair "

If anyone has a .pdf of it, I would appreciate it.

thank you,
Michael A. Terrell

Re: Tek 11801a questions: Nvram battery replacement; SD-26 & SD-24 TDR heads & possible probes ?

 

If you do it that way, you will be making $15 an hour.

https://www.mouser.com/ProductDetail/511-M48Z3570PC1 ~~$15 each

Digikey is slightly cheaper, <$13 each.

After all, they last 20+ years. Probably longer than some of us will be around.

Regards

----- Original Message -----
From: <@garp66>
To: <TekScopes@groups.io>
Sent: Tuesday, February 06, 2018 5:01 PM
Subject: [TekScopes] Tek 11801a questions: Nvram battery replacement; SD-26 & SD-24 TDR heads & possible probes ?


Some Tek 11801a questions:

1 ] I have a Tek 11801a scope that powers-up but gets stuck at the E5322 ERROR.
I understand that for ~ $30, some battery replacements can be ordered:
https://xellers.wordpress.com/2014/02/26/fixing-a-50ghz-sampling-scope-tektronix-csa803/

But I'd like to try a sensible repair related by:
https://www.eevblog.com/forum/repair/problems-with-built-in-batteries-of-a-tektronix-11801-sampling-oscilloscope/

Where, exactly, does one simply solder in a single 3V Li+ battery holder to bypass the existing battery pack(s) { see photo in Web link }?
It would seem prudent to bypass the existing battery (+) terminal, so that it is out of the circuit ?
Was a trace cut, or a pin pulled out of a socket of the original ?

The example was shown in a photo by "Physikfan", -- but no details !

Web link to photo:
https://ci3.googleusercontent.com/proxy/tjN83bToWriYuNSy7RVSfrlAEqJDV78qf5n9AfgGigihb0WezOYyHeYkSl5J1S8gqLvYfLmz6Xm9SbPzYpUK-I1ElMRwU32dzLqyG1pNqV3m6bUlsenWcelF8RPZ0zK3mNN6bw=s0-d-e1-ft#http://galerie.experimentierkasten-board.de/data/media/201/P1190786400x408.jpg

2 ] Probes:

I have sampling heads SD-26 (non TDR) and SD-24 (TDR), but no probes... !
a) What probes am I looking for ?
b) Can probes be made ( Web link URL's or .pdf's ??)

I'd like to use this scope up at 40GHz ( with an HP 70K MMS SA & signal generator, etc. ) for Rx design work for amateur RA.

thank you,

Re: More vectorscope questions (1740, 1420)

Dale H. Cook
 

At 02:09 PM 2/6/2018, Toby wrote:

Can anyone confirm whether the Tek 1740 (not 1740A) vectorscope can be used in X-Y mode (via REMOTE connector)? ... Also can the Tek 1420?
If you had asked that question 20 years ago when I was CE of a small NTSC station here in the States I might have been able to look in the manuals (we used both) and advise, but at this juncture I've forgotten almost everything I knew about them.

Dale H. Cook, GR / HP Collector, Roanoke/Lynchburg, VA
http://plymouthcolony.net/starcity/radios/index.html

Re: Tek 11801a questions: Nvram battery replacement; SD-26 & SD-24 TDR heads & possible probes ?

garp66
 

Also: for the Tektronix 11801a scope:

3 ] Am looking for the article by John Larkin covering the Tektronix 11801 Timebase Errors:
I have tried to find an actual working Web link to this article, but, No luck.

" Tek 11801 Timebase Errors by John Larkin, Highland Technology Inc, jjlarkin@... 11801 and CSA803_TB_error 5622 repair "

If anyone has a .pdf of it, I would appreciate it.

thank you,

Re: More vectorscope questions (1740, 1420)

Glydeck
 

So to answer the original question, “Does a 1740 support XY for audio monitoring?” I think the clue is to look at the reticle. If there are two squares, one in the lower left corner, and the other in the upper right with a ‘plus’ target in the center then it should support XY audio monitoring. Looking at the 1740 there are no squares, while the 1740A has the squares used for audio phase alignment. Take a look at this image from the 1740A manual.

http://promoemail.wmg.com/images/Vector_XY.jpg

The 1420 is much older and does not support XY.

George

On Feb 6, 2018, at 2:59 PM, Harvey White <madyn@...> wrote:

Return-Path: <bounce+9741+144095+87830+1123634@groups.io>
Received: from web01.groups.io (web01.groups.io [66.175.222.12])
(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
(No client certificate requested)
by mtaiw-mca02.mx.aol.com (Internet Inbound) with ESMTPS id 5365070000097
for <glydeck@...>; Tue, 6 Feb 2018 18:00:08 -0500 (EST)
X-Received: from p3plsmtpa06-06.prod.phx3.secureserver.net (p3plsmtpa06-06.prod.phx3.secureserver.net [173.201.192.107])
by groups.io with SMTP; Tue, 06 Feb 2018 14:59:55 -0800
X-Received: from LAPTOP-SDB2B8VC ([184.89.254.34])
by :SMTPAUTH: with SMTP
id jCDMebPnZdERajCDSeNMfZ; Tue, 06 Feb 2018 15:59:55 -0700
From: "Harvey White" <madyn@...>
To: TekScopes@groups.io
Subject: Re: [TekScopes] More vectorscope questions (1740, 1420)
Date: Tue, 06 Feb 2018 17:59:49 -0500
Organization: Laid-Off-Press, Inc
Message-ID: <1510DEC13ABAE550.25092@groups.io>
References: <1510D5FF21016D2A.10151@groups.io> <1510DAE2C7ECA561.25092@groups.io>
In-Reply-To: <1510DAE2C7ECA561.25092@groups.io>
MIME-Version: 1.0
X-CMAE-Envelope: MS4wfFWCykiFEVG0ojwEf78/zT0oFOnMBx/QfQlMj6uYIBSl7UOti0oJ//3zoYM03kUeTSmjcuKrcisCl/jWNh56mZHtfvhy6PujVWMSTeF2fTwzaIXZBa+I
ty4Ju6eWgHjaJ1+aLBHKcEDEsY5JxYgypxOh32aHQgHWBThFQeBF6FWMrFx5L8JT1RbtxsN3c/BDgA==
X-Orig-Message-Id: peck7dpbs5kkaoj88pkp77luiuaq2libh9@...
Precedence: Bulk
List-Unsubscribe: <https://groups.io/g/TekScopes/unsub>
Sender: TekScopes@groups.io
List-Id: <TekScopes.groups.io>
Mailing-List: list TekScopes@groups.io; contact TekScopes+owner@groups.io
Delivered-To: mailing list TekScopes@groups.io
Reply-To: TekScopes@groups.io
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=groups.io;
q=dns/txt; s=20140610; t=1517958007;
bh=oOsYYZY49gdHeaCOLwZacbC1rOVOkDh0+y0NWOh5Ytg=;
h=Content-Type:Date:From:Reply-To:Subject:To;
b=B+rjxsow54E+PhvuUg3To7OqmjeqgoQmGFi9tmREj/YHo64uZ6VpyXXsugrDxXrMvs6
V5KkmBDlAxhJfwut5rAbGZa+0QJZyAbG4QE6HVZhWSo/MLLlpQjfDC+b8WKMeupTluo4T
tMbmQJ/y08UzGlsPwBl/rgl2ulkESuYNors=
x-aol-global-disposition: G
X-AOL-SCOLL-AUTHENTICATION: mtaiw-mca02.mx.aol.com ; domain : groups.io DKIM : pass
Authentication-Results: mx.aol.com;
spf=pass (aol.com: the domain groups.io reports 66.175.222.12 as a permitted sender.) smtp.mailfrom=groups.io;
dkim=pass (aol.com: email passed verification from the domain groups.io.) header.i=@groups.io;
x-aol-sid: 3039ac1add485a7a337831a0
X-AOL-IP: 66.175.222.12
X-AOL-SPF: domain : groups.io SPF : pass

On Tue, 6 Feb 2018 16:48:40 -0500, you wrote:

On 2018-02-06 3:19 PM, Michael A. Terrell wrote:
Why would any Vectorscope have an XY mode? They are a specialized version of an oscilloscope, with all of the unneeded features removed. They aren't lab instruments, they are for video production people.
Usually for testing stereo audio.
There's a very specific pair of instruments that are used for analog
TV. One is a waveform monitor, an oscilloscope with specialized
triggering and sweep settings for observing the analog TV waveform.
This could be done with an oscilloscope with TV triggering.

The second is a color vectorscope. It shows a very specific display
with the color burst, amplitudes of the color bars and other things
that have to do with how the color information is encoded.

While the display is an X-Y display, the input circuitry is
specialized to extract the 3.579545 Mhz subcarrier and demodulate it
for the R-Y and B-Y components. Those get put on the screen. If you
wanted to use the scope for XY, you'd have no front end, no gain
controls, and you'd have to bypass the existing circuitry. You're
more looking for a Tek 620 (or 600 series) display, which (IIRC) are
XY displays. I do have one that has a vector display graticule, but
it is a true XY display, not a vectorscope.

Harvey



--Toby


-----Original Message-----
From: toby@...
Sent: Feb 6, 2018 2:09 PM
To: TekScopes@groups.io
Subject: [TekScopes] More vectorscope questions (1740, 1420)

Hi,

Can anyone confirm whether the Tek 1740 (not 1740A) vectorscope can be
used in X-Y mode (via REMOTE connector)?

Also can the Tek 1420?

Manuals for these two models don't seem to be available online at the
moment.

Thanks.

--Toby



Michael A. Terrell