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Free Oscilloscope


#1

Hi guys,

I have an old Tektronix 422 portable OScope, I was too lazy to take a picture so I found one on the web: http://www.biocomp.net/o11915.htm.

This scope was given to me many years ago when I did not have one and I would like to pass it on to someone else who does not have a 'scope. It is only a 10 mHz two channel scope but is still a whole lot better then nothing. It could stand to have some tuner cleaner squirted through the controls as it has been setting for a few years.

The only stipulations are that you have a need for a 'scope and won’t just turn around and sell it and that you will pick it up or pay shipping. You can send me an email at birt_j@ soigeneris.com


#2

Alright, I’ll bite. What’s it weigh so I can estimate shipping? Looks like it could be hefty. I’ve yet to need a scope with the FEZ boards, as they have just worked for my projects so far. Would be fun to take a peek at the different signals, though. I can also use it to debug occasional glitches in my model train control system. it will help me figure out how many engines I can run at once before I pop a circuit (don’t really want to ‘live test’ the breaker).

TIA,

Eric


#3

Just in case the shipping cost would be too high,
I have been using thid 200$ quad channel scope (2x analog + 2x digital) for a couple of weeks, it is lightweight and powefull yet !
Battery powered, I can cary it on fields…

http://www.seeedstudio.com/depot/dso-quad-4-channel-digital-storage-oscilloscope-p-736.html?cPath=174


#4

@ Nicolas: nice product, what’s the screenresolution?


#5

So far the oscilloscope nicolas pointed out is “ok”, nothing more.
Chris does not like these scopes at all :stuck_out_tongue:

I am looking for a scope too. However, seen the price of most oscilloscopes, I would rather buy an expensive one which is decent and of high quality which lasts a lifetime.

If you want it portable you could look at the pico scopes, which are usb powered, but more expensive.
http://www.picotech.com/oscilloscope-specifications.html


#6

Robert is right - this is not an utra precise mesurement tool. I spend a few hours calibrating it and it is far to be perfect. The GUI takes some time to understand too (and is sometimes a pain). I would say the vertical precision is right now of about 10 to 20%. The screen resolution is not very high, but it is so damn small ! The effective bandwith is about 15Mhz (144 MS/s) on a single analog channel, half if using 2 analog channels (72MS/s / channel).

However, if you are tight in space, and want a small pocket tool to see what is happeping, this is “ok”. This is a good tool for the price (That is also all the money I could spend right now). If you want a lifetime tool for more than “viewing” what is happening and measuring peaks accuratly, you may look for another device…

What is great is that it is an open-source device : you can modify its software, and I think in few months we will see alternative software for it (people are working on a quick spectrum analyser function using FFT, and I2C and serial analyser, etc).

This is a memory scope : You can capture a PWM pin for 1s, the signal moving very fast, and then stop the capture and scroll back slowly to see what happened. This is not something you can do with a traditional analog scope.

So : as most products, there are pros and cons (especialy for low cost products).
I have to say that at work I have an old but good 2x 100Mhz traditional analog scope (35 pounds…) that I can use if I need !


#7

Nicolas3, i think you replied to the wrong thread :wink:


#8

EriSan : thanks, corrected. I don’t know what happened, I was watching 2 threads, and when I replied to the other one, it replied to both at the same time ! :smiley:


#9

I actually have a job that involves electronics, so my opinion comes from “I don’t’ want to mess with it, I want it to WORK” :wink:

I avoid all cheap electronics tools, because the accuracy of the test instrument will always be in question.

When I troubleshoot electronics, I want to get the fewest variables possible, to eventually solve for one variable which triggers the issue. This can be impossible when the test instrument itself is a variable, and thus, the point of even having the test instrument in the first place is negated.


#10

@ EricH: I’ll put it on the scale tonight and let you know how much it weighs. If you can give me your zipcode I’ll estimate shipping for you.


#11

05408 in the beautiful state of Vermont, where it seems to rain every weekend (so far this summer at least).


#12

Jeff - I found the weight… ~23 lbs. I added a few pounds for good measure and came up with $32 via UPS ground. Paypal would be my preference for payment.


#13

Sorry for taking so long in getting back to you, I have been busier than a one legged man in a butt kicking contest ???

I just weighted the scope and you were pretty close with the weight. I just ran a quick shipping estimate through my UPS account and came up with $24.00. Just send it to my PayPal account at birt_j@ soigeneris.com and I’ll get it on its way to you. It has two decent probes with it so you should be all set.

As I mentioned it you use some tuner cleaner to clean up the front panel controls it would help a lot.If you have experience with CRTs you could also probably pull the focus in a bit tighter as well.


#14

Thanks Jeff! The notification from PayPal should have the shipping address. You have a lot of one legged butt kickers in Missouri? They must do some kind of karate kid crane kick to pull that off!


#15

Jeff -

I wanted to post another thank you here for supporting the community (and me) with this offer. My 7 yr old son is quite intrigued with all the knobs and levers on the scope! It’s added another level of coolness to what he has coined our ‘inventing room’.

Eric


#16

Glad your having fun with it Eric. A friend gave it to me years ago when he got a better one. I’m glad to pass it on to someone else that can have fun learning to use it.

If you have a signal generator your son could have a lot of fun displaying lissajou patterns: http://en.wikipedia.org/wiki/Lissajous_curve


#17

Eric, I found the second probe tip today (you may have noticed one was missing.) I’m sending it out in todays mail.