Electronics > Beginners
Probes for 5 MHz Oscilloscope
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forre65413:
I have a oscilloscope noob question. I just picked up my first oscilloscope at a garage sale for $7, a Heathkit IO-12. It came with a Pomona BNC to banana adapter, but no probes. From what I can find out, this probe was made during the 1960's and is a 5 mHz machine. I want to use this to learn about oscilloscopes. Should I just bite the bullet and buy the vintage probes on Ebay, or is there a modern probe that will will work?

BTW, I did check to see that it turned on and had a display, but will be testing and replacing caps as needed, as well as a broken pot.
StillTrying:
At 5 mHz almost any bit of wire will do, ringing usually doesn't start until about 30Mhz, you could make something useful from some screened cable that would do to start testing.

It must be a very slow timebase and very long persistence. >:D
ebastler:
@StillTrying, this is the Beginners forum, so the OP may or may not appreciate your joke.

@forre65413 -- of course you meant MHz (MegaHertz), not mHz (milliHertz). Even at 5 MHz, I assume that a modern probe connected to the BNC > banana plug adapter would work OK. With the low prices on no-name Chinese probes on ebay, I would just get one. The basic probes, typically specified at 20MHz, should work fine.
forre65413:
Thanks, guys!

I am almost mortified that i used the wrong case of m for megahertz. Just this past week at work I had to tell a guy that his Fluke 289 would not measure as low as he wanted because mΩ and MΩ are a billion times different.

I will look at cheap probes on Ebay. If nothing else, I can hack something together with RG-59, a BNC connector, and some alligator clips.
StillTrying:

--- Quote from: forre65413 on April 29, 2018, 07:01:10 pm ---I am almost mortified that i used the wrong case of m for megahertz. Just this past week at work I had to tell a guy that his Fluke 289 would not measure as low as he wanted because mΩ and MΩ are a billion times different.
--- End quote ---

I'm sure you'll get me back one day! You can 'modify' the subject of your first post as well as the text if you want.


--- Quote ---I will look at cheap probes on Ebay. If nothing else, I can hack something together with RG-59, a BNC connector, and some alligator clips.

--- End quote ---

I would, I quite like these quite small test clips I used for a HiTechDiyProbe.
https://www.eevblog.com/forum/beginners/diy-x1-high-bw-passive-scope-probe/msg1169643/#msg1169643
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