On Thu, 2 May 2019 10:03:24 -0500, you wrote: WOW what a nice reply Harvey! Thank you very much! You swiped me off my
feet with all the details! Well, step back from the leaves and look at the branch, then step back and look at the tree, then the forest. Easy to get lost when you're trying to count leaves in a national park... OK, I knew I was over my head, but now I think I'll start at -100th floor
and work up from there. Get a feel for it. Some things are good for scope functional evaluation, some things are needed to calibrate and standardize scopes. What are you building this lab for? Not only why, but what do you want to do? Immediate answers not needed (and they're for you, not me). But the answers for these questions show you different directions for equipment. Digital electronics require a very different set of instrumentation (with overlaps always) than RF measurement, or Audio, or general purpose repair, or television, etc. Always ask questions, sometimes even if you know the answer. Always something to be learned. Don't worry about how much you know, or don't know. Nobody knows everything, or is expected to... Me? I do a lot of general purpose work, but a lot of design in digital, power supplies, graphics displays, etc. That tends to make me look at relatively high bandwidth analog (500 Mhz to 1 Ghz if needed), I use logic analyzers and a fair amount of power supplies as needed. Signal generators and meters are also useful. RF stuff? Not that much. So that's how my lab works. Harvey I'l read this later and try to go from there.
All of you TEK guys are GREAT! Thank you all!
On Thu, May 2, 2019 at 12:03 AM Harvey White <madyn@...> wrote:
On Wed, 1 May 2019 22:00:36 -0500, you wrote:
Thanks for a fast reply Harvey!
I'm not a professional, just a hobbyist and I love to fix anything I get my
hands on. Well, I've been in electronics for a while, and even earned money
doing it, so I guess I qualify as a professional of sorts.
When I see how people dump everything, before thinking to fix it, it makes
me sick how wasteful we become. Some of this stuff is not possible to repair without tools and parts
not available to most...
If I could fix stuff for free I would, that is how much I love to give
anything a second, third... chance to do its work.
Helping handicapped and old/poor people brings me more joy, when I see
their eyes sparkling again!
So not for now I don't need a perfect scope, but a working one that gets me
there. My plans are to teach anyone some basic electronics and encourage
them to have a hobby..... A good Tektronix scope will be a joy, *if* they can appreciate it.
I once brought a 7000 series scope into a classrom with a 7CT1N (curve
tracer) plugin so I could demonstrate transistor curves.
One of the students looked at it and said "old tech".
He's right, but his view is a trifle narrow....
For now the scope does something, that is much more than when I received
it, so now I like to play and learn, since my modern scope is nothing like
2465 DMS. likely not.
But I always wanted Tek scope so I have one and it needs a checkup and or a
way to make it work well. Well, the basic checks are useful for functionality. IIRC, there are
some functional checks in the service manual.
You can check the sweep at least by looking at the relative numbers of
cycles going from one range to another. You won't get exact, but
you'll see if 20 us/div is about right.
Ditto for the vertical section.
I found on eBay *Tektronix PG506 - * but they are mostly a PLUG-IN style.
Can I run it without a housing? No.
It's made to go into a TM500 style housing. It's a power supply unit
with individual (and somewhat odd) voltages available to each
plugin...
Generally comes in 1,3, 4, and 6 module sizes. The 5 unit is made to
be portable. There may be a 2 unit size, but I'm not sure.
TM 501, TM503, TM504, TM515 (portable), and TM506. The TM5000 series
is similar, somewhat larger, with the units being microprocessor based
and remote controllable.
Most of the TM500 units fit into the TM5000 frame, but no TM5000 unit
will fit into a TM500 frame.
When I look over the pictures for *Tektronix PG506 *it seems to me that the
power supply is in the base unit..... but I don't know anything about it. You're right, that's where it is intended to go. There are some older
(perhaps tube) models of test generator, though.
Starting with say, a 20 Mhz oscillator, divide by 10, then 2 to get a
1 us period waveform. Divide by 5 then 2 to get a 2 Mhz waveform (500
ns period), divide by 2 to get a 100 ns period waveform, etc. With
the right frequencies and TTL divider chips, you can get yourself a
timing generator.
The 1-2-5 for voltage is harder, though.
I have skills and even 3D printer, so I can make something to cover the
back end, where I can make a power supply connect.... First just find the TM500 style plugin unit. Check out the TM500
series of plugins (DC 5xx, DM 5xx, PG5xx, etc. They may be a good
addition to your lab, within reason. They're not wonderful, but they
are decently made.
I'll keep your email and start looking for a complete *Tektronix PG506, *it
can be a great addition to my tools here. Read the description first, and don't spend tons of money on it.
What you'd be getting is the amplitude part of a calibration
generator, that puts out voltages in the 1-2-5 sequence that Tektronix
uses. It's very convenient and was intended to help calibrate their
vertical plugins and vertical channels.
The more scopes you have, the more you may need this, but think about
it first. There's a lot you can do to work around not having one.
Harvey, you are great help and the rest of the guys here are also very
helpful, I'm glad to belong to Tektronix group! It's a good group.
You make me smile more and more! Keep asking questions. There's no perfect setup, and a number of
workarounds.
Harvey
Tony
On Wed, May 1, 2019 at 9:34 PM Harvey White <madyn@...> wrote:
On Wed, 1 May 2019 21:10:39 -0500, you wrote:
Since I'm new to Tektronix 2465 DMS with DMM, what "signal
standardizer"
model number would I need? DC voltage standard (PG506 will work, set it on DC for the DMM). works
for the scope too.
Does anyone have one and what should I look for in a used unit? good cosmetics, good reports on the seller, and an idea of what you'd
have to replace if things were bad.
Are they mostly good or is there some parts that make them less
reliable?
Ebay and local and you takes your chances....
Where do you buy your parts and who is reliable to buy from for Tektronix?
Major distributors (Mouser, Digikey, Arrow, etc) for standard parts.
Sphere and Qservice are most reliable, buying another with a different
problem is often quite useful.
I do have Aktakom Function Signal Generator, 50MHz - 2 channels. Is
that
good enough? For waveforms, maybe. (linearity).
How do you measure the voltages, and the frequencies (vertical and
horizontal calibration)?
Function generator may not be enough, depending on how serious you
want to get.
Harvey
Thank you guys, you have helped me a lot!
Tony
On Wed, May 1, 2019 at 9:03 PM Harvey White <madyn@...> wrote:
On Wed, 1 May 2019 18:13:05 -0400, you wrote:
With four 7000 series scopes in my lab, I've been patiently waiting
for
a 067-0587-00,01, or 02 signal standardizer for about a year now
and I
finally grabbed one today. They've been going for pretty big money
(worth
more than the scope itself) but I managed to snag it for $77 (with
shipping) off of eBay.
My one concern of course is that it works and doesn't need some
form of
rehabilitation.
I will soon find out.
Most of mine worked. The digital circuitry, as I remember it, is
relatively simple. Just checked the listing. Looks clean from here.
Good luck.
Harvey
On Wed, May 1, 2019 at 11:13 AM Harvey White <
madyn@...>
wrote:
On Tue, 30 Apr 2019 12:47:26 -0700, you wrote:
Hi All,
I need one, good working scope to get started on repairing the
other 30
or so scopes around here. I have a multitude of Tek 7000 frames
to
choose
from but I think the 7904 (or 7904A) is a good place to start.
Once
that's
working + cal'ed I can at least troubleshoot and maybe repair the
others.
Where can I get one professionally calibrated in the greater
Detroit
area? I can drive a fair distance, but I'm scared to ship. I've
had
two
7934's, a 7834, and a 7704A crushed in separate shipping mishaps.
Can't help you there, I'm in the southeast. However...
Also...which plug ins are recommended to cal for building my
golden
scope? I have a collection...
The typical plugins for a 7904 (and that's a good choice, IMHO)
are
at
least one if not two 7A26, and a 7B92A (which I happen to like).
If
you want the flexibility of two sweep plugins, the 7B80 and 7B85
will
do. If you have a 7103/4 and a 7B10 and 7B15, you could use them
but
the sweep is not calibrated at the highest frequencies, but those
could be moved over to the 7103/4 when needed.
For things you'd want:
067-0587-01 signal standardizer. The 01 is intended for 500 mhz
scopes, the 00 is for lower bandwidth, and the 02 is for the 1GHz
bandwidth scopes. Needed to keep the mainframes all agreeing with
each other as well as provides some nice linearity and gain
signals.
You could use the 00, but it wouldn't allow you to check out the
frequency response to the limit of the scope's bandwidth for
higher
bandwidth scopes.
PG506/TG501 SG503/SG504 TM500 plugins that provide calibration
signals for vertical and timebase checking, as well as frequency
response. Those will do any scope. The signal standardizer is
specifically for 7000 series mainframes.
You could also go with a CG501 (TM500) or a CG5001 (TM5000) module
with the appropriate frame. Note that the CG series may need a
specific head to supply the right signals. Those heads may be
difficult to find.
My favorite (depending) setup in a 7904 is a 7A26 (or 7A24 if I
need
more bandwidth and can tolerate a 50 ohm input plugin), a 7D12
with
an
M2 (sampling) module, a 7D15 counter, and a 7B92A sweep.
Harvey
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