First DS1054Z waveform - is this 70 vpp ripple ?? - Page 1
Forum section: electronics / beginners

author: ez24
author_rank: Super Contributor
timestamp: May 17, 2015, 02:27:37 am
content: HiThis is from a small buck module bought on Aliexpress. It is constant V and I and I took these readings at 3.3 v 0.5 amps. So far impressive because I can set the max V and the max I.Do the pictures look like 70 vpp ripple?ps - this is my first use and waveform from my new Rigol.thanksedit: corrected mistakes

author: Skimask
author_rank: Super Contributor
timestamp: May 17, 2015, 03:00:08 am
content: Time to re-read the manual.

author: Armxnian
author_rank: Regular Contributor
timestamp: May 17, 2015, 03:31:51 am
content: The 30mv value in the top right is the trigger level.

author: Rick Law
author_rank: Super Contributor
timestamp: May 17, 2015, 04:38:41 am
content: I guess your poor school in the third world find ways to afford it after all...If you are going to teach concepts, I think you best read the manual beginning to end. I am a relative newbie myself too.Looking at your attached photo, it looks like you are on 10mV/division, and the wave spans just about 7 divisions. So it looks like your wave is around 70mV p2p from what is visible. This would be about what I expect from my small collection of 5 to 6 buck boards with different architecture.RickQuote from: ez24 on May 04, 2015, 06:36:52 pm

author: ez24
author_rank: Super Contributor
timestamp: May 17, 2015, 05:42:07 am
content: FYI the Rigol is to test the < $100 scopes. I got the Xminilab and I am waiting for a DSO112. Once I get used to the Rigol and get the DSO112, I will start looking at it and the Xminilab using the Rigol to compare them with. The Rigol is for me, the other two are what I am looking at for the "lab".The first thing I notice is the Rigol is much easier to use, I just plug it in. I have to read the manual on the Xminilab because I have to figure out how to add power and probes and the controls.

author: aveekbh
author_rank: Regular Contributor
timestamp: May 17, 2015, 06:04:13 am
content: Quote from: ez24 on May 17, 2015, 02:27:37 amHello ez24, do you have a typo there? That's 70mVpp- channel 1 is set to 10 mV/div.Also, what is the current being drawn from the buck regulator? Check against the specs (if they are available).

author: Rick Law
author_rank: Super Contributor
timestamp: May 17, 2015, 06:17:01 am
content: Quote from: ez24 on May 17, 2015, 05:42:07 amAh - good that I did not say congrats. I thought you managed to get a budget large enough some how.As to reading the manual and adding power/probes, it is just a one time event. Best of luck!

author: Delta
author_rank: Super Contributor
timestamp: May 17, 2015, 11:58:04 am
content: Yes, that's seventy volts ripple.You can always see 70v on a 10mv/div scale...

author: continuo
author_rank: Frequent Contributor
timestamp: May 17, 2015, 01:05:22 pm
content: You just need a bigger screen

author: ez24
author_rank: Super Contributor
timestamp: May 17, 2015, 05:31:23 pm
content: QuoteSorry about that - in my first failed attempt to add pics - I had pics of the load = 3.3 v at 0.5 ampI am going to start a new topic on just the buck regulators that I got now that I know what ripple and trigger voltages are. I will add it when I do. I am running the buck at 2 amps now and will look at the ripple again.