Oscilloscope and DMM Suggestions !

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Re: Oscilloscope and DMM Suggestions !

Post by JMPGuitars »

crgfrench wrote:
Sat 08/15/20 9:13 am
It is high -- I realized I sent an 800mV signal in instead of a 200mV signal! Now I know exactly what you were talking about with the tenma generator...
On the bright side, you CAN use your scope to dial in the Tenma to the correct mV, but if you ever bump the knob, you gotta set it again. My UTG932E is currently set at exactly 150mV, and won't move if I don't want it to.
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Re: Oscilloscope and DMM Suggestions !

Post by JMPGuitars »

Ha, it looks like I just won a new signal generator! I'm getting the SDG2042X, which is awesome. I bought it before and returned it because it was too expensive / more than what I needed...but for free, it's perfect! ;)

So should I sell my UTG932E? Does anybody want it? I paid $130, I suppose I could sell it for $100 plus shipping?

I gotta say though, I really prefer the tiny size of the UTG932E. I'll probably get over it. :lol:

Thanks,
Josh
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Re: Oscilloscope and DMM Suggestions !

Post by JMPGuitars »

Well, I guess I'm over the AWG size problem... I just received a new scope I also won. lol

This one has a built in AWG, so now I have more bench space again. Yay!

Check it out:
new-scope.jpg

I put velcro on the feet, and a screen protector on the touch screen. I'm sure that will bother somebody somewhere. 😂

As fast as I thought my old scope was, this is much faster/snappier. I'm gonna have some fun with this thing.

Thanks,
Josh
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Re: Oscilloscope and DMM Suggestions !

Post by JMPGuitars »

I love my new scope's touch screen. They set it up really well.

Testing for the foil side of a cap:
SDS2504X Plus_PNG_9.png
SDS2504X Plus_PNG_10.png

I'm looking forward to my upcoming build to have some more fun with this scope.
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Re: Oscilloscope and DMM Suggestions !

Post by Bieworm »

Bought myself a scope too today. Cheap 200$ scope, but it'll have to do for now...
Just learning the basis. Trying to find oscillation in my imperial...

It's a utd2025cl
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Re: Oscilloscope and DMM Suggestions !

Post by JMPGuitars »

Bieworm wrote:
Wed 12/23/20 5:42 pm
Bought myself a scope too today. Cheap 200$ scope, but it'll have to do for now...
Just learning the basis. Trying to find oscillation in my imperial...

It's a utd2025cl
In that price range, you'd be better off getting the SDS1102CML+ from Siglent, or the one Craig got is around that price range too. Your scope has very low memory/sampling capability. For the small difference in price, it's worth getting a newer/more capable toy.
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Re: Oscilloscope and DMM Suggestions !

Post by Bieworm »

JMPGuitars wrote:
Wed 12/23/20 6:10 pm
Bieworm wrote:
Wed 12/23/20 5:42 pm
Bought myself a scope too today. Cheap 200$ scope, but it'll have to do for now...
Just learning the basis. Trying to find oscillation in my imperial...

It's a utd2025cl
In that price range, you'd be better off getting the SDS1102CML+ from Siglent, or the one Craig got is around that price range too. Your scope has very low memory/sampling capability. For the small difference in price, it's worth getting a newer/more capable toy.
Too bad. But it will have to do. If I ever feel the need to upgrade .. I will.
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Re: Oscilloscope and DMM Suggestions !

Post by JMPGuitars »

Bieworm wrote:
Wed 12/23/20 6:19 pm
Too bad. But it will have to do. If I ever feel the need to upgrade .. I will.
You don't like returning things? ;)
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Re: Oscilloscope and DMM Suggestions !

Post by Bieworm »

JMPGuitars wrote:
Wed 12/23/20 6:23 pm
Bieworm wrote:
Wed 12/23/20 6:19 pm
Too bad. But it will have to do. If I ever feel the need to upgrade .. I will.
You don't like returning things? ;)
Not at all, except they only sell utd and fluks... jikes those cost a fortune
Just looked, the siglent costs twice the price. Is mine so much worse?
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Re: Oscilloscope and DMM Suggestions !

Post by TriodeLuvr »

There are some real bargains now in used scopes when it comes to bandwidths suitable for audio work. Heck, I'm still using the Hitachi V-1050F 100MHz that I bought new back around 1986. LOL, spent almost as much for two NOS replacement probes recently as it would cost to replace the whole scope. FWIW, scopes aren't the best instrument for chasing oscillations. A spectrum analyzer good to 500 MHz or so is much better suited to that.

Jack
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Re: Oscilloscope and DMM Suggestions !

Post by JMPGuitars »

Bieworm wrote:
Wed 12/23/20 6:58 pm
Not at all, except they only sell utd and fluks... jikes those cost a fortune
Just looked, the siglent costs twice the price. Is mine so much worse?
I thought you said $200 for yours? Siglent has a couple better models between $260 to $300, but if shipping is an issue, that would drive up the cost.

For comparison, your's has 1/4 the sampling, and much less memory. The UTD has 25K memory compared to 2M on the Siglent.

I have a couple pieces of test stuff from UTD and they're okay, but I wouldn't rely on them for anything expensive or scope-like.

If that's the best that's available in a reasonable price range, it's probably fine... but I would keep an eye on the used market too.
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Re: Oscilloscope and DMM Suggestions !

Post by Daviedawg »

"SDS1102CML+ from Siglent"

You raised my hopes I might get a decent unit for an acceptable price. But this preferred oscilloscope seems to be about £120 dearer here than in US. Almost double the price effectively. Too much for the limited use I will put it to.

My father was a well known radio ham. When he was too infirm he offered me most of his gear. I took some but not his oscilloscope. My rear end has been sore ever since from kicking myself.

Have a super Christmas everyone. It just snowed here btw. Yippee.

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Re: Oscilloscope and DMM Suggestions !

Post by Bieworm »

I received a gift earlier this week from my wife's uncle.
An ensemble of the same series equipment:

Philips pm 3230 scope ( tube driven )
Philips pm 5105 LF generator
Philips pm 5508 PAL color tv patern generator

It didn't get any more pro those days. This is old testing gear from the Philips R&D departement in Eindhoven Holland.

But the scope is really dirty and it needs some TLC. When that's up and running I can use that one for the detailed measurements.
20201222_204816.jpg
20201220_095525.jpg
20201220_095606.jpg
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Re: Oscilloscope and DMM Suggestions !

Post by JMPGuitars »

Daviedawg wrote:
Thu 12/24/20 3:20 am
"SDS1102CML+ from Siglent"

You raised my hopes I might get a decent unit for an acceptable price. But this preferred oscilloscope seems to be about £120 dearer here than in US. Almost double the price effectively. Too much for the limited use I will put it to.

My father was a well known radio ham. When he was too infirm he offered me most of his gear. I took some but not his oscilloscope. My rear end has been sore ever since from kicking myself.

Have a super Christmas everyone. It just snowed here btw. Yippee.

Dd
Oh that sucks. It's really cheap here in the US. I'd pay attention to the used market. Look at EEVblog.com in the buy/sell section, they often have used scopes in the UK there.

Merry Kritmas! ;)
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Re: Oscilloscope and DMM Suggestions !

Post by JMPGuitars »

Bieworm wrote:
Thu 12/24/20 4:41 am
I received a gift earlier this week from my wife's uncle.
An ensemble of the same series equipment:
That's awesome.

Maybe you don't need the UTD? Here's a test. Try and get the measurements on screen on the UTD model and see if it gives you the values like I showed in my screenshots above. That's one big area digital scopes are better than any old school stuff. If the UTD doesn't do that well, I'd return it and rely on the old scope until you get a good deal on a digital scope. Check EEVblog like I mentioned above, they might have somebody selling a nice digital scope secondhand close enough to you. If the UTD does do a good job showing those measurements, then it's probably worth keeping if you can't get anything else at a reasonable price.
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Re: Oscilloscope and DMM Suggestions !

Post by Bieworm »

JMPGuitars wrote:
Thu 12/24/20 9:20 am
Bieworm wrote:
Thu 12/24/20 4:41 am
I received a gift earlier this week from my wife's uncle.
An ensemble of the same series equipment:
That's awesome.

Maybe you don't need the UTD? Here's a test. Try and get the measurements on screen on the UTD model and see if it gives you the values like I showed in my screenshots above. That's one big area digital scopes are better than any old school stuff. If the UTD doesn't do that well, I'd return it and rely on the old scope until you get a good deal on a digital scope. Check EEVblog like I mentioned above, they might have somebody selling a nice digital scope secondhand close enough to you. If the UTD does do a good job showing those measurements, then it's probably worth keeping if you can't get anything else at a reasonable price.er
It's so frustrating.. I don't know what to look for. I see a curve where the first top of the positive is bumping and then going flat and down. I wish I knew more about that...there is few info about tube amps
I'm looking for oscillation...
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Re: Oscilloscope and DMM Suggestions !

Post by JMPGuitars »

Bieworm wrote:
Thu 12/24/20 12:14 pm
It's so frustrating.. I don't know what to look for. I see a curve where the first top of the positive is bumping and then going flat and down. I wish I knew more about that...there is few info about tube amps
I'm looking for oscillation...
You mean you're trying to find an oscillation in an amp?


Watch some videos:
https://youtu.be/bCN4LH4urns
https://youtu.be/EpsUVc3lcMk
https://youtu.be/mjZjvDYN-Og


https://youtu.be/y6IUecNa4KE
https://youtu.be/xaELqAo4kkQ


D-Lap, Mr. Carlson's Lab, and EEVBlog are all great sources.

Avoid Uncle Doug he's dangerous. Don't follow his advice (unless you and your amp are both shock proof, and immortal).
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Re: Oscilloscope and DMM Suggestions !

Post by Bieworm »

JMPGuitars wrote:
Thu 12/24/20 1:23 pm
Bieworm wrote:
Thu 12/24/20 12:14 pm
It's so frustrating.. I don't know what to look for. I see a curve where the first top of the positive is bumping and then going flat and down. I wish I knew more about that...there is few info about tube amps
I'm looking for oscillation...
You mean you're trying to find an oscillation in an amp?


Watch some videos:
https://youtu.be/bCN4LH4urns
https://youtu.be/EpsUVc3lcMk
https://youtu.be/mjZjvDYN-Og


https://youtu.be/y6IUecNa4KE
https://youtu.be/xaELqAo4kkQ


D-Lap, Mr. Carlson's Lab, and EEVBlog are all great sources.

Avoid Uncle Doug he's dangerous. Don't follow his advice (unless you and your amp are both shock proof, and immortal).
I'm just trying to comprehend an expand my knowledge... preferably from people with legit knowledge. You have always pointed me in the right direction, so thx for the links. Uncle Doug is funny and entertaining. But that's it. God, I miss rusty
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Re: Oscilloscope and DMM Suggestions !

Post by Bieworm »

Josh, is it theoretically possible to get oscillation caused by the isolated IEC plug?
Just wondering...
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Re: Oscilloscope and DMM Suggestions !

Post by JMPGuitars »

Bieworm wrote:
Thu 12/24/20 4:41 pm
Josh, is it theoretically possible to get oscillation caused by the isolated IEC plug?
Just wondering...
Isolated? I think you mean filtered? A filtered IEC inlet should filter out oscillations, not cause them.

Test your electricity source for oscillations. You could be picking up something else even with the filtered inlet. After confirming that the oscillation isn't coming from outside the amp, then test the amp systematically. Chopsticking/moving wires, tapping caps, etc...

Don't guess, be systematic. I was chasing an oscillation on an amp for a year, and it turned out to be a power supply in a different room of my house.
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