After the reviews of the FNIRSI DSO-150 digital oscilloscope and Your $60 electronics homelab!, I received some requests from viewers to review the DSO PRO, an oscilloscope with characteristics a little superior to the DSO-150.
I gladly purchased the DSO PRO and carried out my analysis, but is it really worth the additional investment of approximately 15 to 18€?
Something that stands out right away is being able to work without needing a cable connected to it to power it, since it is powered by a 1200mAh battery according to the manual, but which in teardown is found to be 1500mAh and that it will be able to be used continuously for about 3 hours.
The screen has a white background with the waveform in blue by default, but you can select a night mode that gives a better contrast, in my personal opinion, of a yellow line on a black background.
A major design flaw, in my opinion, is the fact that doesn’t have a signal output for test probe calibration. If you want to use a test probe with this oscilloscope, you have to calibrate it using an external function generator (or the signal output of another oscilloscope) which seems a bit unreasonable to me.
In this oscilloscope, like other portable models, you don’t have the rotary knob that exists on the DSO-150 and that makes it much easier to use the oscilloscope, making operations such as changing the amplitude or time division very easy. Here I get the point, the lack of this protruding button makes the DSO PRO much more compact and easy to carry, for example, in a pants pocket.
In terms of operation in general and despite the lack of the rotary knob, it’s quite simple and after a few minutes of use, you area able to use the oscilloscope without any problem.
In terms of waveform analysis, I came across a problem with the autoset that apparently works well at higher frequencies. Using a 1Khz sine wave I didn’t get it to work properly, I couldn’t get two equal results or the waveform to be centered on the screen within visible limits as would be expected from an “autoset” function.
Only when I switched to a frequency of 1Mhz did I start to get constant and uniform results, according to what would be expected from the “autoset” function.
Signal analysis is acceptable for sine waves up to 5Mhz, which is the maximum band announced by the manufacturer and if you take the oscilloscope to higher frequencies, you can still understand the waveform, but with a lot of difficulty. Square waves, from 2Mhz onwards, are no longer noticeable.
Worth to buy? Do I stick with the DSO-150 or do I choose this one?
These questions are always complicated, because each person is different. That said, what I can tell you is that this is not a bad, low-cost handheld oscilloscope. You have some limitations like the lack of signal output for calibration which, if you are learning electronics and you don’t have a source to generate a reliable square wave to calibrate the test probe, can be annoying and lead you to spend money on additional equipment . The DSO-150 brings this signal output.
On the other hand, the possibility of going up to 5Mhz opens up a little the range of applications in which you can use this oscilloscope, since the DSO-150 only gives you the possibility to analyze signals up to 200Khz.
The battery is interesting, if you really need it to be portable, or even in hobby applications not having the power cord laying around is always an advantage.
Like everything in life, if you make an informed purchase, knowing the limits and advantages of this device, it can really be a good purchase. It all depends on your case and the use you want to give it. If you think the DSO-150 is really enough for you, don’t spend any more money and stick with it. If on the other hand the DSO PRO features suit your needs, you won’t be underserved.
Watch the video with the review I made that I cover all aspects of the oscilloscope and even do a teardown where you can see the interior with the components used.
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