However, I don't think dso3kb_20210510 was well tested as it seems to have caused several other issues so upgrade to it with caution.
You can see on my previous posts some of the issues I have reported to Hantek.
Hi Imk,
You can see that I only made one post before today and I'm still trying to figure out some things about the scope.
It has been 40 years between using a scope at university and now when I wanted one. For a while, at work, I used logic analyzers, but it has been a software-only world for me for the last 30+ years. For what I want now - using Raspberry Pi and Arduino the 10 version would have more than met my requirements but was out of stock so that's why I have the 15 version. It was also a gift so the additional small cost was covered by the giver!
The version of the software on mine was older than yours and I did consider leaving it ASIS but eventually decided that it made sense to use the latest published version. It may have been a mistake as I didn't have any problems and I still can't find issues with the current version. I have tried the timebase and voltage sensitivity changes but don't get any kind of lockup.
You mentioned a newer firmware version and I notice that this was initially put on the Hantek site and then withdrawn. I know from writing and supporting software that fixes are published and eventually "rolled" into a new release. Since it can be difficult to build fixes for everyone there seems to be a tendency to roll up support updates for several issues and there may be problems resolved but also new undesirable "features" (bugs) that also get introduced.
If I had an issue that required an update and I could be sure that I could revert to a previous version then I would take an update to verify that something could be fixed but probably go back to a known version and wait for the official release. I would also wait a time to see if the new version is deemed a success by the community. It seems this later version was rushed out to please a few folks but also regressed a few things (I also don't want to be a long-term beta tester...). Perhaps you know that it is possible to go back to a previous version?
The FFT for analyzing harmonics looked interesting and I realize that the number of samples points is limited (compared to a dedication SA), so I was initially disappointed that I couldn't look at a square wave and set the "span" to show just a few of the odd harmonics. I was going to write it off until I realized that the calculation requires thoughtful selection of timebase e.g. garbage in = garbage out (user error). Now that I have a better understanding, all is well and the results are what you expect. I haven't noticed a delay from setting it up to seeing the result and I do like the immediate feedback of twiddling knobs rather than clicking software and simulating things with software. That's also why I wanted a "bench" scope and not a unit that needs to be connected to a PC. For me, that would just be too convoluted. The signal generator function is more than I might need and I don't already have one to experiment with.
Is there any difference with the B probes? I see the spec for PP-150B and PP-150 and they seem the same? They are also both 100 Mhz probes so I can't see any reason to use 150 in the name. The same thing for the other probes, as the naming doesn't match the -3dB response of the (theoretical) spec. To match a probe to a scope, isn't it necessary to use a much higher rated probe as the response is something like the square root of the sum of both probe and scope. I noticed that the response of a PP-150 doesn't fall off much to about 350 Mhz e.g. is probably better than you might think. In fact, I do wonder if there really is much difference with the more expensive probes (except, they keep more of your dollars).
One thing about a probe, when the clip is removed, should there be a probe point? I am probably doing something wrong because the probe tip is in the hook part and so the probe accessories like the spring and yellow covers etc. have no use, and the probe can't be used without the hook. Perhaps the PP-150B just means PP-150 (broken version). Perhaps my understanding falls a bit short and you can of course forget a lot in 40 years!
Simon