Date   

Re: 7T11 horizontal memory

Albert Otten
 

On Wed, Dec 19, 2018 at 01:43 PM, Roger Evans wrote:


Albert,

I think your FG504 must have some extra performance features - the spec on
fastest rise and fall times is around 5nsec. Did you mean 200nsec rise and
fall? That would give the linear transitions that you mention.

Roger
Hi Roger, well, who cares about just a factor 1000 ;=). Good that you noticed this! I was still thinking in terms of sub-ns when I switched from the PG506 Fast Rise to the FG504.

Albert


Re: 7T11 horizontal memory

Roger Evans
 

Albert,

I think your FG504 must have some extra performance features - the spec on fastest rise and fall times is around 5nsec. Did you mean 200nsec rise and fall? That would give the linear transitions that you mention.

Roger


Re: 468 still

Colin Herbert
 

I have both Tektronix Service manuals for the 486. Volume 2 is P/N 070-3516-00 and the latest revision is December 1982. On schematic #8 it shows +13.0V at the bases of Q958 and Q987A. Bear in mind that R971 connects to the +15V bus at one end, but then goes to chassis via R970 (the B sweep start pot) and R972. So, the voltage on the slider will vary according to the position of the slider of R970. If my arithmetic is correct this variation will be 12-13V, so your maximum 12V is low and your minimum 9V is also low. Maybe R970 has a dirty track?
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of lop pol via Groups.Io
Sent: 18 December 2018 02:14
To: TekScopes@groups.io
Subject: [TekScopes] 468 still

Im still troubleshooting my 468. My schematic is blurry and I was wondering if anyone could tell me the proper voltage at the base of Q958 and Q987A on the A15 board. I have 15V on one side of R971 but he other side is wildly fluctuating between 9V and 12V I don't think thats right. Thanks guys.


Re: 7T11 horizontal memory

Albert Otten
 

Hi Chris,

Now I confirmed my remarks quoted below, using the 7T11A/7S11 combo in my 7854. Real time range .5 ms/div, speed 200 ps/div. In 7854 analog mode of course again I only see sparsely scattered dots. But after ACQ (acquire) I get a nice stored waveform, with correct edge and rise time, exactly as in the 7T11 equivalent time ranges. This works because ACQ continues acquiring until (almost) all horizontal positions in the stored waveform are filled. With 1024 points per waveform this took many seconds!
BTW I used the square wave output of an FG504. One feature of this function generator is that rise and fall times can be selected. I chose 200 ps and 150 kHz repetition rate (quite arbitrarily, higher might be better to reduce jitter). The 200 ps transitions are still nearly linear with sharp corners at top and bottom, in stead of S-shaped. Very nice.

Albert

On Tue, Dec 18, 2018 at 04:36 PM, Albert Otten wrote:


Hi Chris,
Without quoting here all the previous stuff I like to visit these findings
once more:


The risetime thing is interesting. If I use the 7T11 in real-time mode with
my S-1 head, the risetime is about 100us.
However, in equivalent-time mode, I can quite easily see the 350ps risetime
of the head and the waveform looks accurate.

With my least-broken S-2 head, the risetime in real-time mode is definitely
faster than with the S-1. But the waveform
as seem through the S-2 is definitely not accurate, though in
equivalent-time mode the its risetime is fast (definitely better than 100ps).
In my opinion it's impossible to study these fast rise times in real time
mode. The 7S11 sampling moments are quite random compared to the 7T11 sweep
start moments. Suppose you have the "true" rising edge located somewhere on
the sweep. The fraction of sweeps which show a sample dot on the rising edge
is very small. So you see dots mostly at the bottom and the top line, and
seldom an intermediate dot. Also the last dot in a sweep before the start of
the edge is sampled most often quite some time before the start of the edge.
Similarly the first dot after the edge is mostly much farther to the right on
the screen. So was my observation at 500 ps/div at the 3rd RT range and 200 ps
rise time. If you look at "some distance" then you might have the impression
that the rise time is rather long. If you look at how far the bottom line dots
appear to the right and the top line dots to the left, then you notice just a
small time gap between those two, more realistic for the true rise time.

Albert


Metalwork for 7854 power supply

 

I just acquired another 7854 (Wot? Not another 'scope?).

In its previous history someone has removed the bottom and side covers from
the power supply (200-1262-00, 200-1906-00, 200,1263-01). I think these may
be the same as 7834, 7934 and 7104.

Does anyone have these parts available (ideally in Europe)? Or a spare 7854
PSU?

Meantime I'll continue struggling to remove C154 which has leaked from the
power supply (rusted screws).

Dave


Re: Which probes fit 7A14 module ?

Jim Ford
 

Well, I was going to recommend the Tek probe cross reference list on
TekWiki: http://w140.com/tek_probe_crossref_1990.pdf, a reference
document every Tek nutcase should own, but it doesn't list one for the
7A14. Still a great .pdf to have handy. :)

Jim F

------ Original Message ------
From: "Jan Wuesten" <fjz@die-wuestens.de>
To: TekScopes@groups.io
Sent: 12/18/2018 2:03:25 AM
Subject: [TekScopes] Which probes fit 7A14 module ?

Dear List,

could you please help me, which probes fit the 7A14 current amplifier ?

Thank you

Jan


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Re: Succession plans and wills - Re: [TekScopes] How Many Scopes?

G Hopper
 

I think that's the value in 'bundles'. A couple of pieces of 'stuff' along
with the one gem. It's not an unreasonable approach.

I do agree that the "you have to take it all" approach can be off-putting
to some, though for me, I've always been willing because I can then put
pieces into the hands of people that need or can make good use of things
and I have both the time and space to make this happen. If it's the 'all
or nothing' there will be people that take the all. In that case and when
the goal is to clear things out, that approach works too.

On Tue, Dec 18, 2018 at 6:10 PM Dave Seiter <d.seiter@att.net> wrote:

It's fairly common on CL too- if you want the high end/useful goodies in
a freebie pile, you have to take the whole pile.
-Dave
On Tuesday, December 18, 2018, 5:49:14 PM PST, EricJ via Groups.Io
<wyzkydd2358=yahoo.com@groups.io> wrote:

It's pretty easy to understand really. If they want to capitalize on
getting some free stuff then they have to do the work of clearing out the
rest. If nobody is willing to do that then you don't have a whole lot more
work to do than you already did.
--Eric
Sent from my Samsung Galaxy smartphone.






Re: Succession plans and wills - Re: [TekScopes] How Many Scopes?

Dave Seiter
 

It's fairly common on CL too- if you want the high end/useful goodies in a freebie pile, you have to take the whole pile.  
-Dave

On Tuesday, December 18, 2018, 5:49:14 PM PST, EricJ via Groups.Io <wyzkydd2358=yahoo.com@groups.io> wrote:

It's pretty easy to understand really. If they want to capitalize on getting some free stuff then they have to do the work of clearing out the rest. If nobody is willing to do that then you don't have a whole lot more work to do than you already did.
--Eric
Sent from my Samsung Galaxy smartphone.


Re: Succession plans and wills - Re: [TekScopes] How Many Scopes?

EricJ
 

It's pretty easy to understand really. If they want to capitalize on getting some free stuff then they have to do the work of clearing out the rest. If nobody is willing to do that then you don't have a whole lot more work to do than you already did.
--Eric
Sent from my Samsung Galaxy smartphone.

-------- Original message --------From: "Bob Albert via Groups.Io" <bob91343=yahoo.com@groups.io> Date: 12/18/18 5:23 PM (GMT-06:00) To: TekScopes@groups.io Subject: Re: Succession plans and wills - Re: [TekScopes] How Many Scopes?
I can't understand the 'you have to take it all' rule.  How many people have room for some of these collections?  Wouldn't it be nice just to get rid of as much as possible?  Then what's left probably has minimal value and can be scrapped.
Bob
    On Tuesday, December 18, 2018, 3:11:35 PM PST, Artekmedia <manuals@artekmanuals.com> wrote:

Wish I had thought of that one when I invited my late wife's friends
over to go through her shoes and clothes after she passed

Dave
manuals@artekmanuals.com
( PS : Picked up a new 7A13 and a AM503 today to help complete my
collection..... :-) )

On 12/18/2018 5:46 PM, redarlington wrote:
My plan is simple.  Anybody can have anything they want.  But you have to
take it all.

-Bob

On Sat, Dec 8, 2018 at 5:36 PM <toby@telegraphics.com.au> wrote:

On 2018-12-08 2:38 PM, oliver johnson via Groups.Io wrote:
Hi all I for one have more scopes than i can or will ever use , but for
some strange reason i keep getting them . For me it just fixing them that i
enjoy and once fixed it goes in the pile that i have , speaking of pile i
am looking for one last tek to complete my dual beam collection,  7844 is
the last tek needed for dual beam collection,  if anyone has one reasonable
please let me know,  thanks and keep the hobby going .


This thread really makes me wonder how many collectors have a succession
plan for when we can't take care of them all any more.

How many have lined up a Will, or executor who will successfully be able
to rehome your collection to a museum or suitably responsible individual?

The "wife seeks to get rid of 97 of husband's instruments by Sunday,
local pickup only", that we see semi-regularly now, is far from the
worst case scenario.

--Toby


Disclaimer: I haven't




    On Sat, Dec 8, 2018 at 1:39 PM, TomC<tomc@viclink.com> wrote:  On
12/7/2018 3:15 PM, Craig Sawyers wrote:
Now just what do I do if I have to display more than 12 waveforms at
once ?
Ah - you can do that with a single 7844
How?










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


Re: Succession plans and wills - Re: [TekScopes] How Many Scopes?

Bob Albert
 

I can't understand the 'you have to take it all' rule.  How many people have room for some of these collections?  Wouldn't it be nice just to get rid of as much as possible?  Then what's left probably has minimal value and can be scrapped.
Bob

On Tuesday, December 18, 2018, 3:11:35 PM PST, Artekmedia <manuals@artekmanuals.com> wrote:

Wish I had thought of that one when I invited my late wife's friends
over to go through her shoes and clothes after she passed

Dave
manuals@artekmanuals.com
( PS : Picked up a new 7A13 and a AM503 today to help complete my
collection..... :-) )

On 12/18/2018 5:46 PM, redarlington wrote:
My plan is simple.  Anybody can have anything they want.  But you have to
take it all.

-Bob

On Sat, Dec 8, 2018 at 5:36 PM <toby@telegraphics.com.au> wrote:

On 2018-12-08 2:38 PM, oliver johnson via Groups.Io wrote:
Hi all I for one have more scopes than i can or will ever use , but for
some strange reason i keep getting them . For me it just fixing them that i
enjoy and once fixed it goes in the pile that i have , speaking of pile i
am looking for one last tek to complete my dual beam collection,  7844 is
the last tek needed for dual beam collection,  if anyone has one reasonable
please let me know,  thanks and keep the hobby going .


This thread really makes me wonder how many collectors have a succession
plan for when we can't take care of them all any more.

How many have lined up a Will, or executor who will successfully be able
to rehome your collection to a museum or suitably responsible individual?

The "wife seeks to get rid of 97 of husband's instruments by Sunday,
local pickup only", that we see semi-regularly now, is far from the
worst case scenario.

--Toby


Disclaimer: I haven't




    On Sat, Dec 8, 2018 at 1:39 PM, TomC<tomc@viclink.com> wrote:  On
12/7/2018 3:15 PM, Craig Sawyers wrote:
Now just what do I do if I have to display more than 12 waveforms at
once ?
Ah - you can do that with a single 7844
How?










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


Re: Succession plans and wills - Re: [TekScopes] How Many Scopes?

Artekmedia <manuals@...>
 

Wish I had thought of that one when I invited my late wife's friends over to go through her shoes and clothes after she passed

Dave
manuals@artekmanuals.com
( PS : Picked up a new 7A13 and a AM503 today to help complete my collection..... :-) )

On 12/18/2018 5:46 PM, redarlington wrote:
My plan is simple. Anybody can have anything they want. But you have to
take it all.

-Bob

On Sat, Dec 8, 2018 at 5:36 PM <toby@telegraphics.com.au> wrote:

On 2018-12-08 2:38 PM, oliver johnson via Groups.Io wrote:
Hi all I for one have more scopes than i can or will ever use , but for
some strange reason i keep getting them . For me it just fixing them that i
enjoy and once fixed it goes in the pile that i have , speaking of pile i
am looking for one last tek to complete my dual beam collection, 7844 is
the last tek needed for dual beam collection, if anyone has one reasonable
please let me know, thanks and keep the hobby going .


This thread really makes me wonder how many collectors have a succession
plan for when we can't take care of them all any more.

How many have lined up a Will, or executor who will successfully be able
to rehome your collection to a museum or suitably responsible individual?

The "wife seeks to get rid of 97 of husband's instruments by Sunday,
local pickup only", that we see semi-regularly now, is far from the
worst case scenario.

--Toby


Disclaimer: I haven't




On Sat, Dec 8, 2018 at 1:39 PM, TomC<tomc@viclink.com> wrote: On
12/7/2018 3:15 PM, Craig Sawyers wrote:
Now just what do I do if I have to display more than 12 waveforms at
once ?
Ah - you can do that with a single 7844
How?









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


Re: Succession plans and wills - Re: [TekScopes] How Many Scopes?

redarlington
 

My plan is simple. Anybody can have anything they want. But you have to
take it all.

-Bob

On Sat, Dec 8, 2018 at 5:36 PM <toby@telegraphics.com.au> wrote:

On 2018-12-08 2:38 PM, oliver johnson via Groups.Io wrote:
Hi all I for one have more scopes than i can or will ever use , but for
some strange reason i keep getting them . For me it just fixing them that i
enjoy and once fixed it goes in the pile that i have , speaking of pile i
am looking for one last tek to complete my dual beam collection, 7844 is
the last tek needed for dual beam collection, if anyone has one reasonable
please let me know, thanks and keep the hobby going .


This thread really makes me wonder how many collectors have a succession
plan for when we can't take care of them all any more.

How many have lined up a Will, or executor who will successfully be able
to rehome your collection to a museum or suitably responsible individual?

The "wife seeks to get rid of 97 of husband's instruments by Sunday,
local pickup only", that we see semi-regularly now, is far from the
worst case scenario.

--Toby


Disclaimer: I haven't




On Sat, Dec 8, 2018 at 1:39 PM, TomC<tomc@viclink.com> wrote: On
12/7/2018 3:15 PM, Craig Sawyers wrote:
Now just what do I do if I have to display more than 12 waveforms at
once ?

Ah - you can do that with a single 7844
How?











Re: 'Tek Spec' v 'Selected from' wrt RPR

Dave Brown
 

From memory, and it has been a lot of years, but I believe this to be correct. Although a 151-0190-00 is a 2N3904, you don’t know that a generic 2N3904 is a correct substitute. Tektronix may have tightened up one or more specifications for their use and that would be reflected in the Tektronix component specification for that part number. Or they might have loosened one or more specifications to allow multiple vendors under the same part number. As such, the engineers would need to consult the Tektronix component specification for the correct information. Revisions, such as -01 through -05 indicate changes in the specification which could be packaging (metal can, plastic DIP, crimped leads, tape & reel, etc.) or for other specifications were different.

Typically the -00 did indicate a generic part from the vendor, but different vendors could have different typical specification. The PISL (Purchased Information Source List) indicated which vendors parts were used. Sometimes a revision would indicate a specific vendor only if their parts worked better in the circuit or had some specific characteristic. I know I part numbered a specific vendor's part because it behaved better on power up and power down when used in a non-volatile memory circuit. The Common Parts Catalogs sometimes indicate the differences between revisions.

153- prefixes were matched, selected and paired sets of transistors and diodes from 151- and 152-. If selected, it meant that a key parameter had a tighter specification than any of the –XX suffix parts.


Re: 468 still

Brendan
 

lop pol
Dec 17 #153208

Im still troubleshooting my 468. My schematic is blurry and I was wondering if anyone could tell me the proper voltage at the base of Q958 and Q987A on the A15 board. I have 15V on one side of R971 but he other side is wildly >fluctuating between 9V and 12V I don't think thats right. Thanks guys.
Artekmedia
Dec 17 #153209

+13volts
You need to get a better manual copy ...I know just the place
Dave
manuals@...

On Tue, Dec 18, 2018 at 12:38 PM, Roger Evans wrote:


I have a mediocre PDF file of the 468 manual, Artek's manuals are highly
recommended and Dave is extremely helpful, to the point of finding and
scanning a missing page from an obscure manual that I purchased from him.

My mediocre copy seems to say +13.0V on the base of Q958. Have you noticed
that C869 which has nearly 15V across it is rated only at 15V?

Roger
Yes I did notice that and replaced it with a 25V tantalum. This thing has me totally stumped. Thanks for the reply.


Re: 468 still

Roger Evans
 

I have a mediocre PDF file of the 468 manual, Artek's manuals are highly recommended and Dave is extremely helpful, to the point of finding and scanning a missing page from an obscure manual that I purchased from him.

My mediocre copy seems to say +13.0V on the base of Q958. Have you noticed that C869 which has nearly 15V across it is rated only at 15V?

Roger


Re: TDS3032 does not boot. LCD backl-ight and fan working.

David Kuhn
 

I didn't see any other responses or follow ups in the Tek News Group.

Did you figure out your TDS3032 problem?

The EEVBlog Forums might be another good resource to check out.

Dave

On Sat, Dec 8, 2018 at 10:46 AM benj3867 via Groups.Io <benj3867=
yahoo.com@groups.io> wrote:

Thanks Dave.
I suspected that a bad NVRAM will let the scope at least get as far as the
DPO splash screen.

I guess I have a deeper problem.

Can anybody else suggest where I should look?




Re: 468 still

Michael Wyatt
 

I have a pretty clear jpg of the A15 schematic but I have not been able to log on to the site. PM me your address and I will send it to you.
Michael

On Monday, December 17, 2018, 9:26:49 PM EST, lop pol via Groups.Io <the_infinite_penguin=yahoo.com@groups.io> wrote:

On Mon, Dec 17, 2018 at 07:21 PM, Artekmedia wrote:


+13volts

You need to get a better manual copy ...I know just the place
Dave
manuals@artekmanuals.com

On 12/17/2018 9:14 PM, lop pol via Groups.Io wrote:
Im still troubleshooting my 468. My schematic is blurry and I was wondering
if anyone could tell me the proper voltage at the base of Q958 and Q987A on
the A15 board. I have 15V on one side of R971 but he other side is wildly
fluctuating between 9V and 12V I don't think thats right. Thanks guys.



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


Thank you very much.
"You need to get a better manual copy ...I know just the place"
I get the hint :)


Re: Which probes fit 7A14 module ?

Harvey White
 

On Tue, 18 Dec 2018 15:06:39 +0000, you wrote:

P6019 and P6020 are compatible ancestors to P6021 and P6022 and should work fine too.
The coding ring changes the gain and compensation to match the transformer characteristics. It is the same as the Probe Type switch on the front of the Type 134 Current Probe Amplifier.
Does anyone have information on that coding ring?

Harvey



Dave Wise
________________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of Harvey White <madyn@dragonworks.info>
Sent: Tuesday, December 18, 2018 6:41 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Which probes fit 7A14 module ?

On Tue, 18 Dec 2018 11:03:25 +0100, you wrote:

Dear List,

could you please help me, which probes fit the 7A14 current amplifier ?
P6021, P6022 per the manual, however, the default probe is a P6022.
For use with a P6021, you must ground the ring around the BNC. There
was a modification to the probe (a coding ring) that could do that.
Alternatively, you could modify an old (and dead) probe compensation
box to ground the ring.

The manual does not mention any other current probes.

Harvey


Thank you

Jan








Re: 7T11 horizontal memory

Albert Otten
 

(continued) Ah.. I meant 3rd RT of course, not 3rd ET range. Albert


Re: 7T11 horizontal memory

Albert Otten
 

Hi Chris,
Without quoting here all the previous stuff I like to visit these findings once more:


The risetime thing is interesting. If I use the 7T11 in real-time mode with my S-1 head, the risetime is about 100us.
However, in equivalent-time mode, I can quite easily see the 350ps risetime of the head and the waveform looks accurate.

With my least-broken S-2 head, the risetime in real-time mode is definitely faster than with the S-1. But the waveform
as seem through the S-2 is definitely not accurate, though in equivalent-time mode the its risetime is fast (definitely better than 100ps).
In my opinion it's impossible to study these fast rise times in real time mode. The 7S11 sampling moments are quite random compared to the 7T11 sweep start moments. Suppose you have the "true" rising edge located somewhere on the sweep. The fraction of sweeps which show a sample dot on the rising edge is very small. So you see dots mostly at the bottom and the top line, and seldom an intermediate dot. Also the last dot in a sweep before the start of the edge is sampled most often quite some time before the start of the edge. Similarly the first dot after the edge is mostly much farther to the right on the screen. So was my observation at 500 ps/div at the 3rd ET range and 200 ps rise time. If you look at "some distance" then you might have the impression that the rise time is rather long. If you look at how far the bottom line dots appear to the right and the top line dots to the left, then you notice just a small time gap between those two, more realistic for the true rise time.

Albert

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