View Full Version : My new toy, my first oscilloscope


canuckaudiog
06-06-2012, 06:52 PM
Check this sucker out:

http://img209.imageshack.us/img209/7482/dsc00620ur.jpg

Man is it big. Didn't expect that! But it sure is cool.

Now I just need to calibrate the scopes and try it out!

ebacon
06-06-2012, 06:56 PM
Baw-chicka-baw-baw

Scopes are sexah. You did good for seventy five bones. I shopped for about a month for that kind of deal and gave up. I ended up dropping two hundy on 100 MHz Tek. More than I wanted but I needed a scope at the time.

canuckaudiog
06-06-2012, 07:00 PM
Baw-chicka-baw-baw

Scopes are sexah. You did good for seventy five bones. I shopped for about a month for that kind of deal and gave up. I ended up dropping two hundy on 100 MHz Tek. More than I wanted but I needed a scope at the time.

Thanks! I think I did pretty well. Apparently the guy has more stuff for this thing stored up, he used it for his job from like ten years ago. So the deal could get even sweeter, we'll see!

Do you have any idea what that little plastic "protractor" looking thing is for? Looks like it's to align the light, perhaps..

ebacon
06-06-2012, 07:08 PM
Do you have any idea what that little plastic "protractor" looking thing is for? Looks like it's to align the light, perhaps..

I've never seen anything like that. My guess is that it is used to measure phase relationships between two signals. Your first reference would be the manual. Look under a section called XY Mode.

Someone else posted a link to the XYZ's of oscilloscopes. That's a great book. It was assigned to me as a textbook at a community college. Many of us learned scopes from that book.

Sandy G
06-06-2012, 07:09 PM
"There is NOTHING wrong with your Television Set..."

petehall347
06-06-2012, 07:28 PM
nice ...how many mhz? did you get leads with it ? looks easier than mine to use ..less controls .

BinaryMike
06-06-2012, 07:33 PM
The screen overlay might be for video vectorscope operation. Those scopes were sold primarily for TV service applications, so I guess some of them might have included a vectorscope mode. It lets you visualize conventional analog video hue information as vector phase angle and color saturation as vector length.

petehall347
06-06-2012, 07:36 PM
i thought the tv angle myself ..mine has that function too ..i just ignore that bit .

Sam Cogley
06-06-2012, 08:17 PM
Check this sucker out:

http://img209.imageshack.us/img209/7482/dsc00620ur.jpg

Man is it big. Didn't expect that! But it sure is cool.

Now I just need to calibrate the scopes and try it out!

That's not big. A lab-grade tube-filled Tektronix is BIG. What you have is pretty normal for a solid-state scope. :thmbsp:

ebacon
06-06-2012, 08:20 PM
That's not big. A lab-grade tube-filled Tektronix is BIG. What you have is pretty normal for a solid-state scope. :thmbsp:

The old scopes were awesome big. Like dorm refrigerators. :yes:

Wonder whatever happened to the scope cart business. :scratch2:

Sam Cogley
06-06-2012, 08:38 PM
The old scopes were awesome big. Like dorm refrigerators. :yes:

Wonder whatever happened to the scope cart business. :scratch2:

Saw a lot of them set up for solid-state scopes at my first job out of college.

ebacon
06-06-2012, 09:07 PM
Saw a lot of them set up for solid-state scopes at my first job out of college.

I saw that too, but about the time I left the field SS scopes were about the size of what canuck bought. That was about year 2000. TEK just released their new line of LCD scopes and they were only about six inches deep and light as a lunchbox. I can't imagine much of a cart market for those.

Times they are a changing and old is new again and all that stuff. I'm attracted to tubes because they are the polar opposite of the electronics that I worked on. They are a history lesson that I can see and that makes things more real.

Sandy G
06-06-2012, 09:15 PM
Hurts me when I read a story here of somebody who's bought an old Tooob Tek scope simply to harvest the tubes out of it...These noble old beasts deserve better, IMHO.

canuckaudiog
06-06-2012, 09:32 PM
It's a 35mhz unit and it came with 3 scopes.

And yeah, maybe it's not HUGE but.. it's big to me! Haha. I've never owned one before so :)

I wonder how old this unit is, does anyone know anything about this particular guy that I should be aware of? I'm definitely going to check out that XYZ Scopes PDF, I can tell it's a very good resource as I started reading through it.

kcdonahue
06-06-2012, 09:41 PM
I'd say you made out quite nicely!

The bag o' probes is a nice addition to the scope!

Here is my Tek mainframe scope with the cart (7904) and the slightly smaller 454A on top.

http://i197.photobucket.com/albums/aa165/71BMW2002/IMG_2609.jpg

KC

canuckaudiog
06-06-2012, 09:49 PM
That's quite the get-up! What's the main difference between such a big unit and what I have?

ebacon
06-06-2012, 10:07 PM
I'd say you made out quite nicely!

The bag o' probes is a nice addition to the scope!

Here is my Tek mainframe scope with the cart (7904) and the slightly smaller 454A on top.

http://i197.photobucket.com/albums/aa165/71BMW2002/IMG_2609.jpg

KC

That's a nice collection. My first scope was the same vintage as your 454A. I was working at GM Research and they marked it as scrap. I talked to the disposal guy and he said I could have it if I kept my trap shut. Well now I will tell the rest of the story. The statute of limitations has run.

It was about 1988 and I carried it out the front door. As I walked by the security guard he smiled at me and said, "Cleaning the place out before Christmas, are you?" I nodded yes with a feeling of guilt for taking out trash. That was weird. Whatever.

After I got the scope home I troubleshot it using the Heathkit DMM that I built in high school. Best I could tell the scope had a problem in the trigger circuit. The faulty device looked like a transistor but it was called a unitode. I had no idea WTF that was. Still don't. Anyhow I called TEK and they told me that the part was no longer available and neither were substitutions. I was disheartened and let the scope collect dust in my basement for five years or so.

One day I needed more room for new stuff and some old stuff had to go. That day two things went out to the curb. They were the TEK scope and a TASCO telescope that my dad bought for me at the PX when I was a kid. Both of them had served their purposes and I hoped someone would garbage pick them. No one did. :tears:

4seatPilot
06-06-2012, 10:16 PM
Congrats! Looks like a nice one. Have fun with it - I'm just getting used to mine.

Sent from my GT-I9100 using Tapatalk 2

kcdonahue
06-06-2012, 10:21 PM
The nice thing about the 7904 is that a majority of ICs are somewhat available/common. I've contemplated selling it but I always come back to the scenario where my other scope takes a dump and I cant fix it.

KC

kcdonahue
06-06-2012, 10:24 PM
That's quite the get-up! What's the main difference between such a big unit and what I have?

In the audio realm... not too much other than size.

The 7904 is really nice for RF work as it goes up to 500MHz with the right plugin. The plugins are just below the scope and allow it to do an assortment of measurements.

KC

vfr800fiman
06-07-2012, 11:43 AM
I still use my 545 for audio work. They were scrapping it at work, and my buddy who ran the R&D lab asked me if I wanted it. One of the older lab guys said that he used to lug the thing through the airport when going to Sandia national Labs in Albuquerque, New Mexico. Can you imagine lugging that thing around!

I also can't stand to see these units scrapped for tubes. The workmanship inside these things is superb. Silver solder on all the joints! Of course I have to let it warm-up a while before using it :)

rnorton
06-07-2012, 02:52 PM
Hurts me when I read a story here of somebody who's bought an old Tooob Tek scope simply to harvest the tubes out of it...These noble old beasts deserve better, IMHO.

I have an old tube Tek scope, a 516 (15 whole Megahertz), that I'm ready to push to the curb. I have a good 453A that I bought with a cart for $120. The 516 doesn't even have any tubes that I need for what little tube gear I have these days. Takes up a lot of space.