- Up to 100MHz bandwidth, and max 1GS/s real-time sample rate, 10M record length
- Friendly UI : FFT, or X-Y, and waveform 2 views displayed, on the same screen
- Multi-trigger option : edge, video, slope, pulse, and alternate
- USB isolation - less signal inference, more PC protection. USB bus powering, and LAN remote control (optional)
- Ultra-thin body design, easy portability
Owon VDS1022I USB PC Oscilloscope, MIT USB Isolation, 25 MHz
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Bandwidth: 25MHz* Channel: 2+1 (multi)* Sample Rate: 100MS/s* Horizontal Scale (s/div): 5ns/div~100s/div, step by 1~2~5* Rise Time: <=14ns* Record Length: 5K* Input Coupling: DC AC GND* Input Impedance: 1MΩ+-2%，in parallel with10Pf+-5pF* Channels Isolation: 50Hz : 100 : 1, 10MHz : 40 : 1* Max Input Voltage: 400V (PK - PK) (DC+AC, PK - PK)* DC Gain Accuracy: +-3%* DC Accuracy: Average>=16: +-(3% reading + 0.05div) for △T* Probe Attenuation Factor: 1X, 10X, 100X, 1000X* LF Respond (AC, -3dB): >=5Hz (at input, AC coupling, -3dB)* Sampling Rate / Relay Time Accuracy: 150ps* Interpolation: sin(x) / x* Interval (△T) Accuracy (full bandwidth):Single: +-(1 interval time + 100ppm × reading + 0.6ns),Average >16: +-(1 interval time + 100ppm × reading + 0.4ns)* Vertical Resolution (A/D): 8 bits resolution (2 channels simultaneously)* Vertical Sensitivity: 5mV/div~5V/div* Communication Interface: USB 1.1(isolation).
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- the math functions, which allow the two channels to be added or subtracted, functioned poorly, making it impossible to make meaningful measurements. I was also hoping to make better use of the FFT function, but it turned out to not be that useful, at least with the limited amount of time I spent trying to use it.
- 8-bits is pretty grainy, so you don't get a clean signal unless you do some averaging. Looking for small perturbations in the waveform is difficult.
- vertical steps are the normal 1-2-5, but there is no provision for an intermediate variable level, like when you want to fill the screen with the waveform.
- I cannot definitely blame the scope for the death of my laptop while measuring simple audio waveforms, but I'm suspicious something went awry. Most test equipment is designed to be pretty fault tolerant - not so a laptop, so I am nervous about future use of a USB scope and will probably just get an old stand-alone scope, albeit without the cool features the Owon scope has. [2/15/17 update - laptop issue was a broken charging connector, probably aggravated by being in a lab environment, so the issue was not caused by the scope, although dedicating an old laptop to scope duty in the lab seems a better idea than using your primary one.]
I'm sure this scope would be great for many people, but it did not quite meet my needs.
3/1/17 update: Ended up buying a used Tektronix TDS210 scope for not much more than the Owon. It has similar features and performance to the Owon, but being a stand-alone unit, it is much easier to use. The reason for my update is that one of the issues I had with my measurement system when using the Owon scope was a persistent ground loop issue that was making measurements difficult. Because the Owon scope was isolated, I assumed it was not the cause. However, once I moved to the Tek scope the issue disappeared. So the Owon scope may be an OK choice if you are just trying to capture some waveforms, but as part of a measurement system, at least the unit I tested was not a good choice.
I bought the SainSmart DDS120 first since it looked about the same features at $40-50 less. But the trigger was iffy at best and mostly didn't work and the reviews on the VDS1022 said the trigger marginal and they were right. So I returned the DDS120 (thank you Amazon) and got this one.
* the trigger works well.
* was able to have a fast sweep to catch the two types of waves in the signal, but then have a long sweep 1S and it showed all the waves as they happened. In my application it had a 5ms wave every 2 seconds with a 2ms wave every once in awhile. It was able to show that and the detail of each wave.
* Noticed it had a record feature have not used that yet but that will be helpful.
* Able to do simple stuff quickly still some confusion.
* Price. Darn cheap for what it does. It has all the features I will need.
* It assumed you have I CD in your machine I don't. No explanation how to get the software. I looked at the [...]site and found the software to run the scope.
* But also it needed drivers and had to jump through that hoop, they are also found on the site. So you must load the PC software and then the drivers. Only reason I did not give this a 5 but a 4 is because it did not have instructions for a non CD install.
* I feel some of the features are a bit confusing. It does have a help menu which helps.
The pictures are the two wave forms that are mixed together in my application. But using the 1 second sweep I was able to see all the waves and how they were in relationship to each other. The 1ms sweep I was able to see detail of each wave since the trigger caught them.
To me this is a keeper.
Update: Someone asked about the Math function. Initially it didn't appear to work. I used a sine wave and the internal square wave and added Ch1 and Ch2. I found that you had to fake out the V/div scaling and use 10nv/div for 10V/div for the math to work out right. Below is an image of the signals that I added.