This is sounding like it's gaining a little traction. Indman raised it on Florent's github page a couple of months ago but I just noticed that Florent closed it as being a bit too broad a definition. Maybe you could add some additional ideas or detail... https://github.com/florentbr/OWON-VDS1022/issues/57
having taken this oscilloscope with me a few times to other places, it has suffered some eye damage, requiring emergency surgery in one ocasion
So i'm wondering if anyone has found a suitable hard carry case for it? searching on amazon, hard carry cases for electronics are either too large or too small for it. Does anyone have any recommendations? thank you!
Edit: in line image attachments never work for me!
having taken this oscilloscope with me a few times to other places, it has suffered some eye damage, requiring emergency surgery in one ocasion
So i'm wondering if anyone has found a suitable hard carry case for it? searching on amazon, hard carry cases for electronics are either too large or too small for it. Does anyone have any recommendations? thank you!
Edit: in line image attachments never work for me!
See the link below. You can arrange the separators so that it doesn't move. I use it to carry the 1022i and my multimeter.
https://www.amazon.it/gp/product/B08LPFGVQG/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
anyone knows how to cancel out the noise of the probe before using it? I mean when the probe is not connected to anything... it still displays some waveform which I think affect real measurements.
anyone knows how to cancel out the noise of the probe before using it? I mean when the probe is not connected to anything... it still displays some waveform which I think affect real measurements.Probably only when set to high sensitivity and it's mains frequency or some local noisy SMPS.
Just normal shit you need to work with or ignore.
anyone knows how to cancel out the noise of the probe before using it? I mean when the probe is not connected to anything... it still displays some waveform which I think affect real measurements.Probably only when set to high sensitivity and it's mains frequency or some local noisy SMPS.
Just normal shit you need to work with or ignore.
the problem is that I need to measure power supply noise and ripple to below 10 mv which is why I need to null this.
so there is no solution or workaround?
anyone knows how to cancel out the noise of the probe before using it? I mean when the probe is not connected to anything... it still displays some waveform which I think affect real measurements.Probably only when set to high sensitivity and it's mains frequency or some local noisy SMPS.
Just normal shit you need to work with or ignore.
the problem is that I need to measure power supply noise and ripple to below 10 mv which is why I need to null this.
so there is no solution or workaround?Well we are hardly clairvoyant so without a screenshot showing settings and connections or not we have no idea what you see so can't advise with any degree of accuracy.
anyone knows how to cancel out the noise of the probe before using it? I mean when the probe is not connected to anything... it still displays some waveform which I think affect real measurements.Probably only when set to high sensitivity and it's mains frequency or some local noisy SMPS.
Just normal shit you need to work with or ignore.
the problem is that I need to measure power supply noise and ripple to below 10 mv which is why I need to null this.
so there is no solution or workaround?Well we are hardly clairvoyant so without a screenshot showing settings and connections or not we have no idea what you see so can't advise with any degree of accuracy.
here are the pictures taken: https://www.eevblog.com/forum/projects/my-psu-design-ripple-and-noise-with-picture-measurements/msg4520213/#msg4520213
one of the images shows the loose probe and gnd readings
anyone knows how to cancel out the noise of the probe before using it? I mean when the probe is not connected to anything... it still displays some waveform which I think affect real measurements.Probably only when set to high sensitivity and it's mains frequency or some local noisy SMPS.
Just normal shit you need to work with or ignore.
the problem is that I need to measure power supply noise and ripple to below 10 mv which is why I need to null this.
so there is no solution or workaround?Well we are hardly clairvoyant so without a screenshot showing settings and connections or not we have no idea what you see so can't advise with any degree of accuracy.
here are the pictures taken: https://www.eevblog.com/forum/projects/my-psu-design-ripple-and-noise-with-picture-measurements/msg4520213/#msg4520213
one of the images shows the loose probe and gnd readings
this is a 18mvpp square wave at 50hz, i tried to match what i saw in the first picture, and it doesn't look as noisy as yours, this of course not being probing a power supply but connecting a coaxial cable directly to a waveform generator, and the other image is what it looks like when a probe is connected straight to ground through the ground clip of the probe, so perhaps the noise really is there?
this is a 18mvpp square wave at 50hz, i tried to match what i saw in the first picture, and it doesn't look as noisy as yours, this of course not being probing a power supply but connecting a coaxial cable directly to a waveform generator, and the other image is what it looks like when a probe is connected straight to ground through the ground clip of the probe, so perhaps the noise really is there?
well you setup is very clean then, of course you will get clean results. mine is messy and the nature of the design also noisy to some degree... but even if the probe is not connected to anything it will still show noise as seen in pictures.
i am using the alligator clip ground not the spring one... i will try using the spring one to get cleaner results soon. what do you use and recommend?
this is a 18mvpp square wave at 50hz, i tried to match what i saw in the first picture, and it doesn't look as noisy as yours, this of course not being probing a power supply but connecting a coaxial cable directly to a waveform generator, and the other image is what it looks like when a probe is connected straight to ground through the ground clip of the probe, so perhaps the noise really is there?
well you setup is very clean then, of course you will get clean results. mine is messy and the nature of the design also noisy to some degree... but even if the probe is not connected to anything it will still show noise as seen in pictures.
i am using the alligator clip ground not the spring one... i will try using the spring one to get cleaner results soon. what do you use and recommend?
yeah, that's preciesly my point, that perhaps it's not that the oscilloscope is erroneously showing you a nosiy trace, but maybe all that noise is actually part of the signal you're looking at? this because my tests show the 1022i is actually capable of displaying those cleaner traces. Have you unplugged everything else around it for the grounding test? for the picture of it grounded with the probe, i also used the long aligator clip on the probe tip to ground it, and it wasn't that noisy
I suspect that it is still missing, below (I think) 50ms/div, where it switches to roll mode. That's unless they've copied florentbr's software, which allows single trigger right down to the slowest timebase settings. It's quite a long time since I've used the stock OWON s/w though, so I can't say for certain.
Irrc you can probably download the s/w without having the scope. It should display a message when you set the timebase to 50ms/div or slower.
The VDS1022 will work with USB isolators containing the ADUM3106, that's what is included inside the I version. Unfortunately though, the Walmart isolator only has a 1W rated isolated power converter (the one inside the VDS1022I is rated at 2W), so it won't be able to supply enough current to power it.
You could maybe arrange something with a USB 'Y' cable to supply extra power to the VDS after the isolator, maybe from a USB power bank, but you would be better looking for a USB isolator with at least 2W power capability.
AHello .
i noticed that when i set my time division for more than 2us/div,the sampling rate goes lower probably because of the 5k memory.i need to work with 50s/div so i have a sampling rate of 5KS/s! Now if i divide 5000by 10 i get just 500hz max bandwith.is this right or i am hopefully very wrong?
I am worried and have serious buyer remorse now. I live in iran and bought it for 150 dollars because of sanctions and couldn't afford to buy better one.i need 50ms/div to see what is going on for one second but now i have just 500hz .i use it to measure the ripple and noise of the phone chargers that use smps. i could just use my pc soundcard and get better results if i am understanding it right.please help . I hope i am wrong about 500hz bandwidth. i am really confused
for example If I use a gan charger with 2 mhz switching frequency, to see ripple/noise I have to go into the filed of us/div any way right? please correct me if I am wrong.
a complete sine wave needs two times sample rate but square wave 10 times right?
do I understand the samples formula correctly?
in measuring ripples, it is more important to see VRMS and VPP than the full shape of the anomalies.
as a test to understand the relation of sample rate and bandwidth,i used my ipod to output signals from 50hz to 22khz and limited the sampling to 250s/s through timeframe.it still detected the frequency of 22khz and showed the frequency right if I put the trigger button on the section of the screen where the signal was shown. how with 250s/s the device still shows the frequency and amplitude of 22khz with good precision ?
Shouldn’t the 22khz frequency need at least 44k/s sampling?
What am I understanding wrong?
Considering the above results are right , will the device still show the VRMS and VPP of 5 to 10mhz even when I use 50ms/div ? I will lose the shape but who will see it any way in such a big time frame . the ac voltage output is the most important factor. We just want to know if it is beyond a threshold or not.it seems it will still show and detect it with good precision right?
it’s ripple and noise measurement just to review not to make an adapter in the end.
BTW, Do you know of anyway to use pc memory for more sampling rate the way hantek 6022be seem able to? i know hantek sucks in every other way ofcourse .
there was hantek 6074bd also with way better speces that I could somehow stretch myself into buying but i was so doubtful of the brand and had serious doubts about it’s noise floor that I just forgot it. i saw people here don’t trust hantek at all for very good and justified reasons.
looking forward to your informative answers. thanks again.