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Overunity Machines Forum



Best oscilloscope choice?

Started by watari, September 26, 2013, 09:06:50 AM

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0 Members and 2 Guests are viewing this topic.

MarkE

Quote from: Pirate88179 on February 09, 2015, 07:46:25 PM
Yes, I made an error...the 2213 is 60 mghz.  What the heck was i thinking?

Bill
You should have been thinking:  That's like 40MHz free bandwidth!  Can free bandwidth be turned into free energy?

Pirate88179

Quote from: MarkE on February 09, 2015, 07:57:21 PM
You should have been thinking:  That's like 40MHz free bandwidth!  Can free bandwidth be turned into free energy?

I'll check with EMJ.  If anyone can turn free bandwidth into free energy (in his mind anyway) he can.

Bill
See the Joule thief Circuit Diagrams, etc. topic here:
http://www.overunity.com/index.php?topic=6942.0;topicseen

ayeaye

Bill,

I didn't want to emphasize that you made a mistake, i'm so sorry. I wanted to say that you were right that both the Tektronix 2200 series and my scope were made in 1980's, and were 20 MHz and 60 MHz. Many other companies made similar ones. They all had the same design, a large rectangular crt tube, and knobs to the right of it, also were lighter than the previous ones (i guess all of them should be less than 15 pounds). The knobs on all of these do all the same things, and their electronics is similar as well.

I agree that Tektronix is the best, but one can also do with a cheaper one, which is one of these scopes like mine, made by other companies, similar to Tektronix 2200 series. There are disadvantages of course, like i can nowhere get the instructions how to disassemble the switches in my scope, when paid less one certainly gets less. Yet one can get a decent working scope. My screen is 6 inches, crisp and bright as well, and all is nice and stable. A completely useful scope.

ayeaye

They sell now one in ebay that is exactly mine, hitachi v-222, for $50. If you are in America, you may get it with $15 shipping, so all you pay is $65. It is not test signal though what it shows on the screen, so this one may or may not work, but it is certainly repairable. Mine was better, on the photo there were two sine signals on the screen, this showed that both the vertical system and the triggering works. And indeed it finally appeared to be a completely working scope, with no repair.

http://www.ebay.com/itm/Hitachi-Model-V-222-20MHz-2-Channel-Oscilloscope-/171677138055?pt=LH_DefaultDomain_0&hash=item27f8c13c87

ayeaye

Old oscilloscopes are mostly sold without probes. It is possible to use wires instead, but wires don't give a good contact, cause interferences, and they cannot be pushed in too hard, to not damage the oscilloscope's connector. So i bought 100MHz oscilloscope probes from eBay for $8 with shipping. The following video is about unpacking and testing them, sorry for the mistakes which i made, please read the description.

https://archive.org/details/probes_201503