Date   

3RP1, etc, in small Tek scopes

 

as I recall, the tube in the 3" models is a derivative 3WP1/2 tube,
which is longer than the 3RP1A, and has MUCH higher deflection plate
sensitivity.

this tube sometimes appeared with the 3WP designation, and sometimes
with a Tek number, but I think the 3WP1 (sometines a P2 for slower
traces) works in all. some tubes seem to have come from dumont or
general atronics, later tubes were all made in house.

don't have any of the correct tube right now, but our Tek CRTs and
cross-ref data live here:
http://www.sphere.bc.ca/test/tek-crts.html

and our EIA type standard tubes live here:
http://www.sphere.bc.ca/test/crts.html

I have also scanned and posted a large amount of basic CRT data here:
http://www.sphere.bc.ca/test/crt-data.html

all the best,
walter


Re: 2246 With BROKEN COVER HELP

pierron1
 

--- Allan Pierron <pierron1@yahoo.com> wrote:
Hi
I have a tek 2246 with a broken front cover. The
blue
one that cover the front of the scope.
What would be a good glue to glue it with.I can not
find anything that works?
Allan
N8ZHC

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2246 With BROKEN COVER HELP

pierron1
 

Note: forwarded message attached.


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lcd module THS710

Peter de Vroome <p.devroome@...>
 

Hello Group,

I have a Tek THS710 with broken display, it seems that these displays are
manufactured by Sharp (LM320P10?), but has anyone an idea how to get a new
one?

thanks in advance!

Peter PE1DTN

the Netherlands


Re: 3RP1 for a 310A

cinerama84106
 

I often wondered if the 3RP1a would fit my 315A scope. I also wonder
if TEK actually made the CRT's back then???
Anyone know out there?
Mark


Re: 3RP1 for a 310A

Robert Morein <morepub@...>
 

3RP1 for a 310A

Will this CRT fit this scope?


Re: TD pulse generator

Miroslav Pokorni
 

All rise times and other hoopla aside, the thing that amazes me most is that
those old Eveready batteries sat in device for better part of 20 years and
never leaked and they are not even 'Extra Heavy Duty'. In addition to Craig'
s experience, I have two of those and each had battery in it and it never
leaked. In these days, I use alkaline batteries, carefully choose a brand
name (would never touch Eveready because of past leaks) and still, after few
years some of those batteries would leak. I guess, batteries are not yet
digital.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Craig Sawyers" <c.sawyers@tech-enterprise.com>
To: "TekScopes" <TekScopes@yahoogroups.com>
Sent: Thursday, July 03, 2003 7:02 AM
Subject: [TekScopes] TD pulse generator


Hi all

Just received a 067-0513-00 TD pulse generator, bought from eBay for $22.
Of course, there is the big question of whether the TD is alive and well,
so
I tried connecting the curve tracer to the GR output connector; staight
line
in both directions up to 50mA. Ouch!

The TD is held at the end of a short length of air line by a little
knurled
screw. I took the airline out, removed the screw and tapped onto a
surface
to get the TD out. Tiny little beast, around 1.5mm diameter and about the
same high, with a flange on one end. Got that carefully connected to the
curve tracer. Again nothing to 50mA - so I just kept increasing the
voltage
to see what would happen.

At 90mA - bingo! I've never come across a TD in Tek gear with that large
a
peak current. Anyway, I measure Ip=90mA at Vp=0.4V; Iv=10mA at Vv=0.5V;
peak point current of 90mA at 0.85V. With those specs, and the ultra-low
capacitance package I could start to believe the front panel spec of <30ps
switching time.

Next problem was the batteries. There are two 22.5V Energizer 412
batteries
in there in parallel (essentially obsolete), and both were as dead as a
doorpost. Fortunately, they are almost exactly the same size as standard
9V
batteries, so I substituted two of those wired in series. Connect to 7A19
for a quick test - and a nice looking pulse appears!

Neat thing is that this unit has a pre-trigger output, occurring at 60ns
before the TD pulse. It achieves this with a delay cable, so it is not
adjustable.

That gave me a problem when I went across to using a 7T11/7S11/S6 to
measure
the rise time - the 7T11 needs 75ns to get going, so the fast rise and
fall
are off screen. I could get them back again by using 20ns of cable from
the
TD head to the S6, but the rise time is dominated by cable effects
(measured
around 150ps). So I used random sampling, which is not as good as
sequential sampling as regards jitter (spec of 30ps as compared with
10ps),
but it was the only way to get a measurement. I used an SMA/GR adaptor,
and
then plugged the head straight onto the S6.

Interpreting around the jitter (which was actually more like 15ps), the
total rise is about 40ps. Now the S6 is specced at <30ps, as is the
067-0513-00, so the combined response should be <43ps - around what is
measured.

So all in all, this was a good $22 worth (oh, and $32 to get it across the
pond).

Craig


Re: Opinions on TDS 744A

Denis Cobley <denis.cobley@...>
 

Hi
They are a good scope - lots of features.
Only problem is if it fails you will find it difficult to repair as they
were totally board exchange.
Once the scope is classed "Obsolete" no more exchange modules are available.
There were never any circuits published for the TDS5/6/7/800 range of scopes
and they used a number of custom parts so a "seat of the pants" repair is
also difficult.
Having said that, Teks typical failure rate is less than 2% per year so you
may never see it fail.
Life is a risk - do you want to take it ?
Regards
Denis

----- Original Message -----
From: "tbfowler100" <tfowler@mitretek.org>
To: <TekScopes@yahoogroups.com>
Sent: Thursday, July 03, 2003 10:45 PM
Subject: [TekScopes] Opinions on TDS 744A


Is anyone familiar with this scope? Any opinions on it? It has
been discontinued, but seems nice based on its description. There
is no substitute for experience with scopes, however!





Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/


TD pulse generator

Craig Sawyers <c.sawyers@...>
 

Hi all

Just received a 067-0513-00 TD pulse generator, bought from eBay for $22.
Of course, there is the big question of whether the TD is alive and well, so
I tried connecting the curve tracer to the GR output connector; staight line
in both directions up to 50mA. Ouch!

The TD is held at the end of a short length of air line by a little knurled
screw. I took the airline out, removed the screw and tapped onto a surface
to get the TD out. Tiny little beast, around 1.5mm diameter and about the
same high, with a flange on one end. Got that carefully connected to the
curve tracer. Again nothing to 50mA - so I just kept increasing the voltage
to see what would happen.

At 90mA - bingo! I've never come across a TD in Tek gear with that large a
peak current. Anyway, I measure Ip=90mA at Vp=0.4V; Iv=10mA at Vv=0.5V;
peak point current of 90mA at 0.85V. With those specs, and the ultra-low
capacitance package I could start to believe the front panel spec of <30ps
switching time.

Next problem was the batteries. There are two 22.5V Energizer 412 batteries
in there in parallel (essentially obsolete), and both were as dead as a
doorpost. Fortunately, they are almost exactly the same size as standard 9V
batteries, so I substituted two of those wired in series. Connect to 7A19
for a quick test - and a nice looking pulse appears!

Neat thing is that this unit has a pre-trigger output, occurring at 60ns
before the TD pulse. It achieves this with a delay cable, so it is not
adjustable.

That gave me a problem when I went across to using a 7T11/7S11/S6 to measure
the rise time - the 7T11 needs 75ns to get going, so the fast rise and fall
are off screen. I could get them back again by using 20ns of cable from the
TD head to the S6, but the rise time is dominated by cable effects (measured
around 150ps). So I used random sampling, which is not as good as
sequential sampling as regards jitter (spec of 30ps as compared with 10ps),
but it was the only way to get a measurement. I used an SMA/GR adaptor, and
then plugged the head straight onto the S6.

Interpreting around the jitter (which was actually more like 15ps), the
total rise is about 40ps. Now the S6 is specced at <30ps, as is the
067-0513-00, so the combined response should be <43ps - around what is
measured.

So all in all, this was a good $22 worth (oh, and $32 to get it across the
pond).

Craig


Opinions on TDS 744A

tbfowler100 <tfowler@...>
 

Is anyone familiar with this scope? Any opinions on it? It has
been discontinued, but seems nice based on its description. There
is no substitute for experience with scopes, however!


rm564

pirlonga
 

Where can i find (download) the service (or operator) manual and in
particulare the schematic of tektronix rm564, i've 564 schematic
which is different, pirlonga@yahoo.it


Re: Probe parts (was: Re: P6138a probe ...)

Miroslav Pokorni
 

Apparently, your wishes are not too expensive. What Tektronix calls '5 mm'
miniature probe, covers P612X family and hook (black is 013-0107-08, gray
is -07) lists for $6, while 6" ground cable (196-3198-01) lists for $5. The
minimum order might hit you when buying few of each, but that is another
story.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Tothwolf" <tothwolf@concentric.net>
To: <tekscopes@yahoogroups.com>
Sent: Wednesday, July 02, 2003 2:33 PM
Subject: [TekScopes] Probe parts (was: Re: P6138a probe ...)


On Wed, 2 Jul 2003, Miroslav Pokorni wrote:

That must have been a wild rumor. I went to 1990 catalog and took P6133
as an example. The whole package was $120 and in pieces is as follows:

1.. Compensation Box $70
2.. Cable $27
3.. Probe head $15
4.. Probe tip $15
5.. Probe tip hook $ 3.50
6.. Ground accessories $10
Total: $140

That leaves you with 4 extra tips, chore of adjusting compensation box
and $20 in the hole.

The story must have come from people who took only price of box, cable
and tip and called that 'complete probe'.
While on the subject of probe parts, I have about a dozen or so P6120s I'd
like to find tip and ground accessories for. All of them have their
box/cable/probe head, but very few have the tip hook or ground clip/cable.
I guess what I'm looking for would be the accessory kit that originally
came bagged with the rest of the probe.

Also, does anyone know offhand which scope used the P6122? I've got a
couple put away, and don't really know which scope they would have been
used on...

-Toth


Unitra Scope 102

Jörg Kirchhof
 

Hello,

I know, this is a group about tectronix scopes, but maybe someone has some documents about the Unitra Scope OS 102 (DC-30 MHz tube scope with three amplifier plug ins (Broad band, Two Channel, Differential)) It is build in poland and i am searching a technical manual, circuit diagrams or a calibration manual.

Best regards

Joerg


Re: Tek 576 questions -- update

Denis Cobley <denis.cobley@...>
 

Hi Stefan
If all else fails (filters), you can run it from a UPS and it will then get
a nice clean waveform.
Regards
Denis

----- Original Message -----
From: "Stefan Heinzmann" <stefan_heinzmann@yahoo.com>
To: <TekScopes@yahoogroups.com>
Sent: Thursday, July 03, 2003 2:05 AM
Subject: [TekScopes] Tek 576 questions -- update


--- In TekScopes@yahoogroups.com, "Stefan Heinzmann"
<stefan_heinzmann@y...> wrote:
--- In TekScopes@yahoogroups.com, "Stefan Heinzmann"
<stefan_heinzmann@y...> wrote:
I bought myself a 576 on a hamfest today and since I haven't yet
got a
manual for the thing I am trying to find out what problems it may
have
by twiddling the knobs. First experience is positive: it displays
a
clean trace, the main functions all operate, although it seems
some
switch contacts are intermittent - that'll probably rectify itself
by
just using it.
I got some more info now. The switch contact problem is actually one
single problem and it seems to get worse rather than better. The
step
generator doesn't like generating a rising staircase (NPN
noninverting
or PNP inverting) but is perfectly happy generating a falling one.
Occasionally I can get a rising staircase, but today I saw it only
once, whereas yesterday I had more luck.
This one is solved now. It helps when you have a manual ;-)

The culprit was a relay which obviously had a worn out contact. It is
K101, a DPDT relay from Tektronix (part no. 148.0044.00) where one
pole is used only. Amazingly, you can turn the relay by 180 degrees
and thus use the other pole. The relay is its own spare part! Why is
Tek not the biggest relay manufacturer by now?

Furthermore on the end of each of the traces there is a short
highlighted area that looks as if the trace would pass several
times
back and forth, thereby intensifying the trace.
That seems to be because the collector voltage isn't a sine
half-wave,
but has its tip clipped. The voltage stays around the top value for
a
while with a few ripples, which cause the highlighted part of the
trace to show a few curls. Clearly something is amiss in the
collector
supply.
Well, it turns out my mains supply itself has a similarly distorted
waveform. It isn't a clean sine wave but looks more like a triangular
wave with clipped tips. It appears as if the Tek 576 is quite
sensitive to crap on the mains supply. Is that your experience, too?

If so, is there anything that can be done about that (other than
moving house?)

Anyway, the most serious problem is gone. Now I'll have a look at the
calibration...

Cheers
Stefan





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Probe parts (was: Re: P6138a probe ...)

Tothwolf
 

On Wed, 2 Jul 2003, Miroslav Pokorni wrote:

That must have been a wild rumor. I went to 1990 catalog and took P6133
as an example. The whole package was $120 and in pieces is as follows:

1.. Compensation Box $70
2.. Cable $27
3.. Probe head $15
4.. Probe tip $15
5.. Probe tip hook $ 3.50
6.. Ground accessories $10
Total: $140

That leaves you with 4 extra tips, chore of adjusting compensation box
and $20 in the hole.

The story must have come from people who took only price of box, cable
and tip and called that 'complete probe'.
While on the subject of probe parts, I have about a dozen or so P6120s I'd
like to find tip and ground accessories for. All of them have their
box/cable/probe head, but very few have the tip hook or ground clip/cable.
I guess what I'm looking for would be the accessory kit that originally
came bagged with the rest of the probe.

Also, does anyone know offhand which scope used the P6122? I've got a
couple put away, and don't really know which scope they would have been
used on...

-Toth


Re: P6138a probe compatibility with 2400 series scopes

Miroslav Pokorni
 

That must have been a wild rumor. I went to 1990 catalog and took P6133 as
an example. The whole package was $120 and in pieces is as follows:

1.. Compensation Box $70
2.. Cable $27
3.. Probe head $15
4.. Probe tip $15
5.. Probe tip hook $ 3.50
6.. Ground accessories $10
Total: $140

That leaves you with 4 extra tips, chore of adjusting compensation box and
$20 in the hole.

The story must have come from people who took only price of box, cable and
tip and called that 'complete probe'.

Regards

Miroslav Pokorni

----- Original Message -----
From: "chuck_585a" <cfharris@erols.com>
To: <TekScopes@yahoogroups.com>
Sent: Wednesday, July 02, 2003 11:20 AM
Subject: [TekScopes] Re: P6138a probe compatibility with 2400 series scopes


--- In TekScopes@yahoogroups.com, "Miroslav Pokorni"
It is interesting that compensation box for P6138 is the most
expensive box
listed. In 1994 catalog, the box for P6138 is listed at $120, for
P6136 is
$105, while box for 500 MHz probe, P6139 is listed at $70. I say that,
though, long time ago, I have given up any hope of making much sense
out of
published prices. That staff comes from marketing.
I was told that the pricing on probe parts used to be so reasonable
that you could assemble a probe from parts more cheaply than you could
buy one whole.

Tek fixed the "problem" and raised the prices on parts so high that it
was often more economical to buy a new probe than it was to fix one...
especially if more than one part needed replacement.

-Chuck


New file uploaded to TekScopes

TekScopes@...
 

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New file uploaded to TekScopes

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Hello,

This email message is a notification to let you know that
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Re: Tek 576 questions -- update

chuck_585a <cfharris@...>
 

--- In TekScopes@yahoogroups.com, "Stefan Heinzmann"
Well, it turns out my mains supply itself has a similarly distorted
waveform. It isn't a clean sine wave but looks more like a triangular
wave with clipped tips. It appears as if the Tek 576 is quite
sensitive to crap on the mains supply. Is that your experience, too?

If so, is there anything that can be done about that (other than
moving house?)
That marvelous mains supply waveform is likely the result of the
capacitor input rectification filter in the front end of the switching
powersupply of your computer.

The capacitor is big, and can suck up large amounts of current.
Because it only discharges a little bit each cycle, the clipped
tip is the amount of time the capacitor is being charged.

-Chuck


New file uploaded to TekScopes

TekScopes@...
 

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the TekScopes
group.

File : /7D20.zip
Uploaded by : pe1fbo <sh331182@12move.nl>
Description : 7D20 binary images for EPROMS

You can access this file at the URL

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