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Overunity Machines Forum



Oscilloscope advice

Started by TheOne, March 14, 2007, 11:53:43 PM

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bitRAKE

#5
March 17, 2007, 12:05:22 AM
If you need something compact to carry around with your laptop I can recomend SoftDSP's Softscope SDS 200A USB scope. I was lucky to find one on eBay for $600. The technology is very impressive and compact.

http://www.softdsp.com/product/sds200a_01.htm
Energy might not be FREE, but the universe has been building it up for billions of years - the fact that we exist means it is availble to us.

niofox

#6
May 31, 2010, 02:06:03 PM
I just got my paycheck and am about to sink it on a scope
So 3 years later I'm wondering if the above advice has changed at all?  New models maybe?
I'm currently between the TPU and some bedini stuff, what would be best for my first scope (might s'plode it or something)  and should I get some high probes?  like 100x and such to reduce the chance of user error causing damage?

At the moment I'm torn between a "New Digital Color Oscilloscope OWON PDS5022S USB FFT" and a "ARM DSO Portable Digital Storage Oscilloscope DIY Kit" on ebay
Please save me from my ignorance if these are bad choices!

Oh, and I can only get international shipping (I'm in Barbados) so it makes it harder to find the really good deals

broli

#7
May 31, 2010, 02:27:00 PM
Don't get the arm dso. Either by an Owon or an Atten (it has high sampling rate than owon for same price) dso. I have an Atten dso and it's truly magnificent.

niofox

#8
June 08, 2010, 04:45:25 PM
Much thanks!  I got the OWON, I'll see how it goes when it gets here

niofox

#9
June 15, 2010, 10:45:40 PM
Ok so here we are, brand new oscilloscope and everything's running nice
Now I just have this puzzling thing to figure out ...

When I ground my probe everything reads as normal.  When I don't ground it, I get a sine wave, varying in amplitude based on what I touch the probe to ...

I'm sure this is normal ... but I don't understand what is going on.  Can someone explain?  I put the probe on my hand, no ground, and I get a ~6v sine wave at the 10ms timescale.  I probe any end of a random coil I have lying around and I get ~1v same timescale.  I touch the other end of the coil with my hand and it goes to ~6v

I have a bifilar coil.  I hook up the probe to one winding in it, and touch the 1 of the other windings ends with my hand and 6v.  1v when I let it go again
If I touch the plastic bobbin with my hand I get ~2v

Detaching the probe from everything (its always set to 10x) the scope shows mostly a flatline, saing 80mv to 160mv vMax (I've been reading vMax all this time)

Disconnecting the probe from the scope I get 80mv flatline (Nothing strange since the volts/div is set to 2v it is a bit off 0 of course);  Grounding the probe always flatlines to 0v; 

This is all normal right?
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