开云体育

Dennis,

The concepts books (more of a pamphlet) about strain gauges is only 72 pages, so I would be surprised to learn that it was split into two separate books.

I would NOT be surprised to find that it was expanded and then became one or both of the "Transducers" books.

DaveD

The "Typical Oscilloscope Circuitry" book PDF should be o all three sites. Where one wishes to place it is another matter. Since it is, as far as I know, one of a kind insofar as it is not explicitly part of a series, the "Concepts" list would be a reasonable place to put it. Alternatively, it could sit on its own on that particular TekWiki page .

As far as the "Strain Gage [sic]" book is concerned, it is still interesting; I don't remember if the material is wholly contained in either of the "Transducers" concepts books, though, so I downloaded a copy.

DaveD

On 13 Apr 2019, at 17.14, Craig Sawyers <c.sawyers@...> wrote:

I think Chuck found where they all are - and it must have been from there that I downloaded them.

Ah yes. I have looked at that site several times, but missed these files because of their naming convention.

They are up on the Tekwiki now:




--
Soren

Only Volume 1 (062-053) is on Tekwiki. It would be great to get the others on there.

Can you make them available for download or just send them to me, so I can put them up?


--
Soren

I think Chuck found where they all are - and it must have been from there that I downloaded them.

Craig

On 13 Apr 2019, at 16.58, Craig Sawyers <c.sawyers@...> wrote:

I have pdf's of all 7.

Volume 1: 062-0053-00 "Basics"
Volume 2: 062-0112-00 "Diode Devices"
Volume 3: 062-0067-00 "Transistors"
Volume 4: 062-0216-00 "Circuits 1
Volume 5: 062-0217-00 "Circuits 2"
Volume 6: 062-0422-00 "Reference for Vols. 1-3"
Volume 7: 062-0432-00 "Reference for Vols 4-5"

Can't remember where they came from. Are they perhaps on Tekwiki?

Only Volume 1 (062-053) is on Tekwiki. It would be great to get the others on there.

Can you make them available for download or just send them to me, so I can put them up?


--
Soren

I also have a Tek book named, "Semiconductor Diodes and Transistors Programmed Instruction
Volume I Basics", Tek Pub 062-0053-00. Printings in 1963, 66, 67 & 68. Inside it mentions that

there is

also a Volume II "Diode Devices". Volume I is the most in depth study of semiconductor physics

I've

ever seen. That's saying something since I have a BS in electronics. I'd very much like to

own/read

other "Programmed Instruction" Tek books (especially Vol 2 and any volumes in this series) but

this is

the only one I've ever seen.

Chuck Lippmeier

I have Volume 2 and Volume 3. Volume 2 is indeed Diode Devices and Volume 3 is Transistors. I do not
have Volume 1 (yet).

I have pdf's of all 7.

Volume 1: 062-0053-00 "Basics"
Volume 2: 062-0112-00 "Diode Devices"
Volume 3: 062-0067-00 "Transistors"
Volume 4: 062-0216-00 "Circuits 1
Volume 5: 062-0217-00 "Circuits 2"
Volume 6: 062-0422-00 "Reference for Vols. 1-3"
Volume 7: 062-0432-00 "Reference for Vols 4-5"

Can't remember where they came from. Are they perhaps on Tekwiki?

Craig

On Fri, 12 Apr 2019 23:44:32 +0000 (UTC), you wrote:

A buddy of mine has one, and it works really well- I think he's gotten away with lifting 700lbs with it.
I have an air powered hoist rated at 300, which is all I'd put my garage roof through without extra support (I've done 900lbs with a chain hoist and supports).? What I really need is a hoist that folds up, doesn't have long extensions, fits through a narrow door way, has large wheels so it works over grass/dirt/transitions, can lift via a table or sling, and can handle anything form a scope to a pallet of scopes...? we can dream...

Part of this sounds like a refrigerator dolly....

Harvey

When I last moved one of my 19" racks (full), I had to lay strips of plywood and masonite across the back yard- that wasn't a fun move!
-Dave
On Friday, April 12, 2019, 11:15:20 AM PDT, Michael A. Terrell <terrell.michael.a@...> wrote:

Hi Nenad,

Just uploaded the Application Note on TekScopes:

/g/TekScopes/files/42W-5850%20Preventing%20Sampling%20Head%20Overdrive%20and%20Static%20Damage.pdf

Greetings,

Egge Siert

After my last posting I googled around and found this link to an index of
downloadable .pdfs of the largest collection of Tek books I've ever seen. It
even has the "Semiconductor Diodes and Transistors" series I mentioned, I
wanted (7 Volumes not just the 2 I knew about). The Concepts books are
listed too.



Chuck Lippmeier

Hello,

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

File: 42W-5850 Preventing Sampling Head Overdrive and Static Damage.pdf

Uploaded By: Egge Siert

Description:
Application Note

You can access this file at the URL:
/g/TekScopes/files/42W-5850%20Preventing%20Sampling%20Head%20Overdrive%20and%20Static%20Damage.pdf

Cheers,
The 开云体育 Team

On 13 Apr 2019, at 14.58, Chuck Lippmeier <chuck@...> wrote:

I also have a Tek book named, "Semiconductor Diodes and Transistors
Programmed Instruction Volume I Basics", Tek Pub 062-0053-00. Printings in
1963, 66, 67 & 68. Inside it mentions that there is also a Volume II "Diode
Devices". Volume I is the most in depth study of semiconductor physics I've
ever seen. That's saying something since I have a BS in electronics. I'd
very much like to own/read other "Programmed Instruction" Tek books
(especially Vol 2 and any volumes in this series) but this is the only one
I've ever seen.

Also,


--
Soren

On Sat, 13 Apr 2019, 03:19 John Griessen, <john@...> wrote:

Is some way to get alternating display of two different sweep rates on a
7904A?

I fiddled with a 7904A and 7A19 7A26 7B71 7B92A and seemed to get crossed
controls -- left vert with b horiz
and R vert with A horiz. Then found mention of "independent pairs
operation". I'm going to be digging for that in the manual.
Meanwhile does anyone have some hints for getting one sweep at 200 us/div
and one at 200 ns/div?

Yes, this is certainly possible on the 4-slot scopes. I do it on my 7904A.
Two timebases in the vertical slots. Horizontal mode set to ALT, vertical
to CHOP I think (though it could be the other way round). If one of the
time bases is a dual one like the 7B92A you can even make that trace
intensified or delayed.

I demonstrate it on a 7704A here:


The settings are the same on a 7904A, though I find the 7904A's intensity
controls easier to manage to get a clear display.

Chris

I also have a Tek book named, "Semiconductor Diodes and Transistors
Programmed Instruction Volume I Basics", Tek Pub 062-0053-00. Printings in
1963, 66, 67 & 68. Inside it mentions that there is also a Volume II "Diode
Devices". Volume I is the most in depth study of semiconductor physics I've
ever seen. That's saying something since I have a BS in electronics. I'd
very much like to own/read other "Programmed Instruction" Tek books
(especially Vol 2 and any volumes in this series) but this is the only one
I've ever seen.

Chuck Lippmeier

On 13 Apr 2019, at 03:44, wilson2115@... wrote:

I find it interesting at 0 collector voltage the CRT makes a noticeable metal like whine as if some internal metal plates are actually resonating

I picked up a 577 D1 last weekend, and have replaced the CRT — it came with a replacement, due to the original being dim — and a pair of transistors in the Z-axis circuit that died after about twenty minutes of use. I’ll have to recalibrate it due to the CRT change, and storage doesn’t work with the new CRT (but mostly worked on the old one — though the Brightness control had no effect) which I’m hoping is just a calibration problem. Everything else works, though I’m not sure the Display Filter works correctly — that may be the subject of another post.

The only noise I’ve noticed is a faint line-frequency humming from the collector sweep transformer.

However, a metallic whine from (near?) the CRT is something I’ve heard from my 7623 scope in some storage modes, when adjusting the stored display brightness. Given the D1 version of the 577 uses an analog storage CRT similar to that in the 7623, do you (a) have the D1 variant of the 577 and (b) did you have storage turned on?

Hi Nenad,

DC offset also works, and
Volt/div setting increases noise on the trace with higher sensitivity, so I
figure the vertical block of the 7S12 is OK.

So the main suspect is the S-4, but I have no idea how to troubleshoot it.
I can see the tiny sampling pulses being fed to it by 7S12, but nothing
"notable" on the preamp output on pin 4.
...
How to test the snap-diode?

In my opinion everything from 7S12 up to and including the snap-off pulse to the gate bridge is working. The Offset can only work when the peamplifier generates correction pulses and in turn that can only happen when the snap-off pulses are present.
You won't see a signal from the preamplifier when there are no input changes between sample moments. Correction pulses are only needed then to correct drift in the 7S12 memory circuit and each pulse will be very small.
So somehow the sampling bridge does not pass your 10 MHz input signal. There still might be a response however to the input DC level.
Anyway, I'm afraid fault finding and repair will not be easy. I repaired an S-6 by replacing the whole input block with a new unit (which was much cheaper than buying another S-6) but I have no experience with S-4 repair.

Albert

Hi Nenad,

I have a pdf of the Application Note which Craig refers to. Contact me off list. Otherwise I shall upload it on TekScopes a.s.a.p. On this moment it is sitting on the Desktop which is now in use as X-Terminal. Reseating IC's in their "famous" TI DIL-Sockets (when you have a pre-1982 build one) will help sometimes.

Greetings,

Egge Siert

Good Day Gudjon,
that sounds great, and yes, all 7000 series plug-ins I know have the same 50mV/DIV output swing. I have used the mentioned AD807x buffers may moons ago, but the TI/BB buffers are new to me, so thank you for the hint.
Please let us know how your project moves ahead. I just get very excited whenever I see a custom plug-in for Tektronix instruments. Photos would be superb.I have recently finished a simple current sink for the TM500 system and while this is nothing new or advanced, I ?have enjoyed building this simple unit a lot. And the design and making connects you with technology; this is your own sweet thing!?
Enjoy designing & building,
Magnus

Hi Dennis and Magnus

Thanks for the ideas.
I would prefer to put the buffer amplifier at the vertical interface
with very short leads. In that way I will
get two channel output from the 7603. There is +-15V on the vertical
interface board which is more than enough.

I made a test feeding the signal output from the left plug-in into a
7A13 in the right compartment.
It works nicely and the differential signal output at this point is 50mV/div.

AD8079 and OPA633 are the buffers that might work. I will do some
simulations and try to build
a circuit and then post info to the list.

Regards
Gudjon

Hi Dennis and Magnus

Thanks for the ideas.
I would prefer to put the buffer amplifier at the vertical interface
with very short leads. In that way I will
get two channel output from the 7603. There is +-15V on the vertical
interface board which is more than enough.

I made a test feeding the signal output from the left plug-in into a
7A13 in the right compartment.
It works nicely and the differential signal output at this point is 50mV/div.

AD8079 and OPA633 are the buffers that might work. I will do some
simulations and try to build
a circuit and then post info to the list.

Regards
Gudjon

After these needing a treatment with bond paper to polish gold contacts, remove dust?
Any other hints about this plugin?

Zero output on some steps could be either the cam switch contacts (like you say. I had to clean both
of mine as a result of exactly the same symptoms) or one of the funky custom ceramic plate attenuator
resistors. You can unclip those and carefully measure with an ohmmeter. One at a time of course so
they don't get mixed up ;-). But they should be OK. If the input was crazily overloaded the equally
funky and unobtainium fuse would blow and there would be zero output on any range.

Craig

So the main suspect is the S-4, but I have no idea how to troubleshoot it.
I can see the tiny sampling pulses being fed to it by 7S12, but nothing "notable" on the preamp
output
on pin 4. The manual says not to test the sampling bridge diodes using an ohmmeter, but a curve
tracer. How could an ohmmeter (actually DMM, <1mA test current) be more destructive to these
diodes than a curve tracer? (provided that the test is carried out using forward bias only). How to
test
the snap-diode? Is there any other extra-sensitive component I should be aware of?

The reason to use a curve tracer is that it is controlled. You operate it very carefully within the
safe operating area of the tiny diodes and check correct operation both in positive and reverse bias.
I would not even think about deviating from Tek's measurement procedure.

Now sure, the S4 was introduced in the 1960's (and what a design tour de force it was!) when modern
DVM's weren't even a twinkle in the measurement eye. So a meter was something with a 15V battery and a
needle - and 15V in reverse bias would certainly kill a travelling wave sampling diode. But even now
you need to check what the open circuit voltage of your meter is when checking resistance. It needs to
be an absolute maximum of 5V to prevent damage in reverse bias. And it is reverse bias you need to
check - it is that that will particularly reveal whether you have a fried diode. You need to do all
this very, very carefully.

You do know that the input to the S4 (and S6) is exceptionally prone to static damage? Even the static
charge built up on a length of coax can kill an S4. Tek even recommended handling the S4 and S6 on a
static mat with wrist strap.

Mine live with an SMA grounding cap on the inputs until I use them, and then I short circuit every bit
of coax I use when making a connection.

Try and find a copy of the Tek Applications Note 42W-5850 "Preventing Sampling Head Overdrive and
Static Damage".

Craig